From 2566891069e34af8f768b43a3e88278d9db50d98 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Mon, 1 Jun 2020 14:11:32 -0700
Subject: [PATCH] libc.so: Add --list-tunables support to __libc_main
Pass --list-tunables to __libc_main to print tunables with min and max
values. To support --list-tunables, a target should add
CPPFLAGS-version.c = -DLIBC_MAIN=__libc_main_body
CPPFLAGS-libc-main.S = -DLIBC_MAIN=__libc_main_body
and start.S should be updated to define __libc_main and call
__libc_main_body:
extern void __libc_main_body (int argc, char **argv)
__attribute__ ((noreturn, visibility ("hidden")));
when LIBC_MAIN is defined.
Currently this option is only functional on i386 and x86-64.
Two functions, __tunable_update_val and __tunables_print, are added to
update tunable values and print tunable values.
X86 processor cache info is moved to cpu_features so that it is available
for __tunables_print with --list-tunables.
---
csu/Makefile | 12 +-
csu/libc-main.S | 44 ++
csu/version.c | 29 +-
elf/Versions | 6 +
elf/dl-tunables.c | 88 ++-
elf/dl-tunables.h | 17 +
manual/tunables.texi | 33 +
sysdeps/i386/cacheinfo.c | 3 -
sysdeps/i386/start.S | 28 +-
sysdeps/mach/hurd/i386/localplt.data | 1 +
sysdeps/x86/Makefile | 4 +-
sysdeps/x86/cacheinfo.c | 852 ++-----------------------
sysdeps/x86/cpu-features.c | 19 +-
sysdeps/x86/cpu-features.h | 26 +
sysdeps/x86/dl-cacheinfo.c | 888 +++++++++++++++++++++++++++
sysdeps/x86/init-arch.h | 3 +
sysdeps/x86_64/start.S | 36 +-
17 files changed, 1236 insertions(+), 853 deletions(-)
create mode 100644 csu/libc-main.S
delete mode 100644 sysdeps/i386/cacheinfo.c
create mode 100644 sysdeps/x86/dl-cacheinfo.c
@@ -27,7 +27,7 @@ subdir := csu
include ../Makeconfig
routines = init-first libc-start $(libc-init) sysdep version check_fds \
- libc-tls elf-init dso_handle
+ libc-tls elf-init dso_handle libc-main
aux = errno
elide-routines.os = libc-tls
static-only-routines = elf-init
@@ -73,6 +73,10 @@ extra-objs += gmon-start.o
endif
install-lib += S$(start-installed-name)
generated += start.os
+ifeq ($(have-tunables)$(cross-compiling),yesno)
+tests-special += $(objpfx)list-tunables.out
+generated += list-tunables.out
+endif
else
extra-objs += gmon-start.o
endif
@@ -191,3 +195,9 @@ ifneq ($(multidir),.)
$(addprefix $(objpfx)$(multidir)/, $(install-lib)): $(addprefix $(objpfx), $(install-lib))
$(make-link-multidir)
endif
+
+$(objpfx)list-tunables.out:$(common-objpfx)elf/ld.so \
+ $(common-objpfx)libc.so
+ $(common-objpfx)elf/ld.so $(common-objpfx)libc.so \
+ --list-tunables > $@; \
+ $(evaluate-test)
new file mode 100644
@@ -0,0 +1,44 @@
+/* Startup code for libc.so.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ In addition to the permissions in the GNU Lesser General Public
+ License, the Free Software Foundation gives you unlimited
+ permission to link the compiled version of this file with other
+ programs, and to distribute those programs without any restriction
+ coming from the use of this file. (The GNU Lesser General Public
+ License restrictions do apply in other respects; for example, they
+ cover modification of the file, and distribution when not linked
+ into another program.)
+
+ Note that people who make modified versions of this file are not
+ obligated to grant this special exception for their modified
+ versions; it is their choice whether to do so. The GNU Lesser
+ General Public License gives permission to release a modified
+ version without this exception; this exception also makes it
+ possible to release a modified version which carries forward this
+ exception.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* This file should define __libc_main and call __libc_main_body:
+
+ extern void __libc_main_body (int argc, char **argv)
+ __attribute__ ((noreturn, visibility ("hidden")));
+ */
+
+#ifdef LIBC_MAIN
+# include "start.S"
+#endif
@@ -19,6 +19,14 @@
#include <tls.h>
#include <libc-abis.h>
#include <gnu/libc-version.h>
+#ifndef LIBC_MAIN
+# define LIBC_MAIN __libc_main
+#endif
+#if HAVE_TUNABLES
+# include <stdbool.h>
+# include <string.h>
+# include <elf/dl-tunables.h>
+#endif
static const char __libc_release[] = RELEASE;
static const char __libc_version[] = VERSION;
@@ -64,10 +72,27 @@ weak_alias (__gnu_get_libc_version, gnu_get_libc_version)
/* This function is the entry point for the shared object.
Running the library as a program will get here. */
-extern void __libc_main (void) __attribute__ ((noreturn));
+extern void LIBC_MAIN (int, char **)
+ __attribute__ ((noreturn, visibility ("hidden")));
+
void
-__libc_main (void)
+LIBC_MAIN (int argc, char **argv)
{
+#if HAVE_TUNABLES
+ bool stop = false;
+ while (argc > 1)
+ if (! strcmp (argv[1], "--list-tunables"))
+ {
+ __tunables_print ();
+ stop = true;
+ argc--;
+ }
+ else
+ break;
+
+ if (stop)
+ _exit (0);
+#endif
__libc_print_version ();
_exit (0);
}
@@ -76,5 +76,11 @@ ld {
# Set value of a tunable.
__tunable_get_val;
+
+ # Update value of a tunable.
+ __tunable_update_val;
+
+ # Print all tunables.
+ __tunables_print;
}
}
@@ -100,31 +100,39 @@ get_next_env (char **envp, char **name, size_t *namelen, char **val,
} \
})
+#define TUNABLE_UPDATE_VAL(__cur, __val, __min, __max, __type) \
+({ \
+ (__cur)->type.min = (__min); \
+ (__cur)->type.max = (__max); \
+ (__cur)->val.numval = (__val); \
+ (__cur)->initialized = true; \
+})
+
static void
-do_tunable_update_val (tunable_t *cur, const void *valp)
+do_tunable_update_val (tunable_t *cur, const void *valp,
+ const void *minp, const void *maxp)
{
- uint64_t val;
+ uint64_t val, min, max;
if (cur->type.type_code != TUNABLE_TYPE_STRING)
- val = *((int64_t *) valp);
+ {
+ val = *((int64_t *) valp);
+ if (minp)
+ min = *((int64_t *) minp);
+ if (maxp)
+ max = *((int64_t *) maxp);
+ }
switch (cur->type.type_code)
{
case TUNABLE_TYPE_INT_32:
- {
- TUNABLE_SET_VAL_IF_VALID_RANGE (cur, val, int64_t);
- break;
- }
case TUNABLE_TYPE_UINT_64:
- {
- TUNABLE_SET_VAL_IF_VALID_RANGE (cur, val, uint64_t);
- break;
- }
case TUNABLE_TYPE_SIZE_T:
- {
- TUNABLE_SET_VAL_IF_VALID_RANGE (cur, val, uint64_t);
- break;
- }
+ if (minp && maxp)
+ TUNABLE_UPDATE_VAL (cur, val, min, max, int64_t);
+ else
+ TUNABLE_SET_VAL_IF_VALID_RANGE (cur, val, int64_t);
+ break;
case TUNABLE_TYPE_STRING:
{
cur->val.strval = valp;
@@ -153,7 +161,7 @@ tunable_initialize (tunable_t *cur, const char *strval)
cur->initialized = true;
valp = strval;
}
- do_tunable_update_val (cur, valp);
+ do_tunable_update_val (cur, valp, NULL, NULL);
}
void
@@ -161,8 +169,17 @@ __tunable_set_val (tunable_id_t id, void *valp)
{
tunable_t *cur = &tunable_list[id];
- do_tunable_update_val (cur, valp);
+ do_tunable_update_val (cur, valp, NULL, NULL);
+}
+
+void
+__tunable_update_val (tunable_id_t id, void *valp, void *minp, void *maxp)
+{
+ tunable_t *cur = &tunable_list[id];
+
+ do_tunable_update_val (cur, valp, minp, maxp);
}
+rtld_hidden_def (__tunable_update_val)
#if TUNABLES_FRONTEND == TUNABLES_FRONTEND_valstring
/* Parse the tunable string TUNESTR and adjust it to drop any tunables that may
@@ -361,6 +378,43 @@ __tunables_init (char **envp)
}
}
+void
+__tunables_print (void)
+{
+ for (int i = 0; i < sizeof (tunable_list) / sizeof (tunable_t); i++)
+ {
+ tunable_t *cur = &tunable_list[i];
+ _dl_printf ("%s: ", cur->name);
+ switch (cur->type.type_code)
+ {
+ case TUNABLE_TYPE_INT_32:
+ _dl_printf ("%d (min: %d, max: %d)\n",
+ (int) cur->val.numval,
+ (int) cur->type.min,
+ (int) cur->type.max);
+ break;
+ case TUNABLE_TYPE_UINT_64:
+ _dl_printf ("0x%lx (min: 0x%lx, max: 0x%lx)\n",
+ (long int) cur->val.numval,
+ (long int) cur->type.min,
+ (long int) cur->type.max);
+ break;
+ case TUNABLE_TYPE_SIZE_T:
+ _dl_printf ("0x%Zx (min: 0x%Zx, max: 0x%Zx)\n",
+ (size_t) cur->val.numval,
+ (size_t) cur->type.min,
+ (size_t) cur->type.max);
+ break;
+ case TUNABLE_TYPE_STRING:
+ _dl_printf ("%s\n", cur->val.strval ? cur->val.strval : "");
+ break;
+ default:
+ __builtin_unreachable ();
+ }
+ }
+}
+rtld_hidden_def (__tunables_print)
+
/* Set the tunable value. This is called by the module that the tunable exists
in. */
void
@@ -67,10 +67,14 @@ typedef struct _tunable tunable_t;
# include "dl-tunable-list.h"
extern void __tunables_init (char **);
+extern void __tunables_print (void);
extern void __tunable_get_val (tunable_id_t, void *, tunable_callback_t);
extern void __tunable_set_val (tunable_id_t, void *);
+extern void __tunable_update_val (tunable_id_t, void *, void *, void *);
rtld_hidden_proto (__tunables_init)
+rtld_hidden_proto (__tunables_print)
rtld_hidden_proto (__tunable_get_val)
+rtld_hidden_proto (__tunable_update_val)
/* Define TUNABLE_GET and TUNABLE_SET in short form if TOP_NAMESPACE and
TUNABLE_NAMESPACE are defined. This is useful shorthand to get and set
@@ -80,11 +84,16 @@ rtld_hidden_proto (__tunable_get_val)
TUNABLE_GET_FULL (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id, __type, __cb)
# define TUNABLE_SET(__id, __type, __val) \
TUNABLE_SET_FULL (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id, __type, __val)
+# define TUNABLE_UPDATE(__id, __type, __val, __min, __max) \
+ TUNABLE_UPDATE_FULL (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id, __type, \
+ __val, __min, __max)
#else
# define TUNABLE_GET(__top, __ns, __id, __type, __cb) \
TUNABLE_GET_FULL (__top, __ns, __id, __type, __cb)
# define TUNABLE_SET(__top, __ns, __id, __type, __val) \
TUNABLE_SET_FULL (__top, __ns, __id, __type, __val)
+# define TUNABLE_UPDATE(__top, __ns, __id, __type, __val, __min, __max) \
+ TUNABLE_UPDATE_FULL (__top, __ns, __id, __type, __val, __min, __max)
#endif
/* Get and return a tunable value. If the tunable was set externally and __CB
@@ -104,6 +113,14 @@ rtld_hidden_proto (__tunable_get_val)
& (__type) {__val}); \
})
+/* Update a tunable value. */
+# define TUNABLE_UPDATE_FULL(__top, __ns, __id, __type, __val, __min, __max) \
+({ \
+ __tunable_update_val (TUNABLE_ENUM_NAME (__top, __ns, __id), \
+ & (__type) {__val}, & (__type) {__min}, \
+ & (__type) {__max}); \
+})
+
/* Namespace sanity for callback functions. Use this macro to keep the
namespace of the modules clean. */
# define TUNABLE_CALLBACK(__name) _dl_tunable_ ## __name
@@ -28,6 +28,39 @@ Finally, the set of tunables available may vary between distributions as
the tunables feature allows distributions to add their own tunables under
their own namespace.
+Passing @option{--list-tunables} to @samp{libc.so.6} print all tunables
+with minimum and maximum values:
+
+@example
+$ /lib64/libc.so.6 --list-tunables
+glibc.elision.skip_lock_after_retries: 3 (min: -2147483648, max: 2147483647)
+glibc.malloc.trim_threshold: 0x0 (min: 0x0, max: 0xffffffff)
+glibc.malloc.perturb: 0 (min: 0, max: 255)
+glibc.cpu.x86_shared_cache_size: 0x100000 (min: 0x0, max: 0xffffffff)
+glibc.elision.tries: 3 (min: -2147483648, max: 2147483647)
+glibc.elision.enable: 0 (min: 0, max: 1)
+glibc.malloc.mxfast: 0x0 (min: 0x0, max: 0xffffffff)
+glibc.elision.skip_lock_busy: 3 (min: -2147483648, max: 2147483647)
+glibc.malloc.top_pad: 0x0 (min: 0x0, max: 0xffffffff)
+glibc.cpu.x86_non_temporal_threshold: 0x600000 (min: 0x0, max: 0xffffffff)
+glibc.cpu.x86_shstk:
+glibc.cpu.hwcap_mask: 0x6 (min: 0x0, max: 0xffffffff)
+glibc.malloc.mmap_max: 0 (min: -2147483648, max: 2147483647)
+glibc.elision.skip_trylock_internal_abort: 3 (min: -2147483648, max: 2147483647)
+glibc.malloc.tcache_unsorted_limit: 0x0 (min: 0x0, max: 0xffffffff)
+glibc.cpu.x86_ibt:
+glibc.cpu.hwcaps:
+glibc.elision.skip_lock_internal_abort: 3 (min: -2147483648, max: 2147483647)
+glibc.malloc.arena_max: 0x0 (min: 0x1, max: 0xffffffff)
+glibc.malloc.mmap_threshold: 0x0 (min: 0x0, max: 0xffffffff)
+glibc.cpu.x86_data_cache_size: 0x8000 (min: 0x0, max: 0xffffffff)
+glibc.malloc.tcache_count: 0x0 (min: 0x0, max: 0xffffffff)
+glibc.malloc.arena_test: 0x0 (min: 0x1, max: 0xffffffff)
+glibc.pthread.mutex_spin_count: 100 (min: 0, max: 32767)
+glibc.malloc.tcache_max: 0x0 (min: 0x0, max: 0xffffffff)
+glibc.malloc.check: 0 (min: 0, max: 3)
+@end example
+
@menu
* Tunable names:: The structure of a tunable name
* Memory Allocation Tunables:: Tunables in the memory allocation subsystem
deleted file mode 100644
@@ -1,3 +0,0 @@
-#define DISABLE_PREFETCHW
-
-#include <sysdeps/x86/cacheinfo.c>
@@ -54,7 +54,13 @@
#include <sysdep.h>
-ENTRY (_start)
+#ifdef LIBC_MAIN
+# define START __libc_main
+#else
+# define START _start
+#endif
+
+ENTRY (START)
/* Clearing frame pointer is insufficient, use CFI. */
cfi_undefined (eip)
/* Clear the frame pointer. The ABI suggests this be done, to mark
@@ -75,6 +81,11 @@ ENTRY (_start)
pushl %eax /* Push garbage because we allocate
28 more bytes. */
+#ifdef LIBC_MAIN
+ pushl %ecx /* Push second argument: argv. */
+ pushl %esi /* Push first argument: argc. */
+ call LIBC_MAIN
+#else
/* Provide the highest stack address to the user code (for stacks
which grow downwards). */
pushl %esp
@@ -82,7 +93,7 @@ ENTRY (_start)
pushl %edx /* Push address of the shared library
termination function. */
-#ifdef PIC
+# ifdef PIC
/* Load PIC register. */
call 1f
addl $_GLOBAL_OFFSET_TABLE_, %ebx
@@ -96,9 +107,9 @@ ENTRY (_start)
pushl %ecx /* Push second argument: argv. */
pushl %esi /* Push first argument: argc. */
-# ifdef SHARED
+# ifdef SHARED
pushl main@GOT(%ebx)
-# else
+# else
/* Avoid relocation in static PIE since _start is called before
it is relocated. Don't use "leal main@GOTOFF(%ebx), %eax"
since main may be in a shared object. Linker will convert
@@ -106,12 +117,12 @@ ENTRY (_start)
if main is defined locally. */
movl main@GOT(%ebx), %eax
pushl %eax
-# endif
+# endif
/* Call the user's main function, and exit with its value.
But let the libc call main. */
call __libc_start_main@PLT
-#else
+# else
/* Push address of our own entry points to .fini and .init. */
pushl $__libc_csu_fini
pushl $__libc_csu_init
@@ -124,6 +135,7 @@ ENTRY (_start)
/* Call the user's main function, and exit with its value.
But let the libc call main. */
call __libc_start_main
+# endif
#endif
hlt /* Crash if somehow `exit' does return. */
@@ -132,8 +144,9 @@ ENTRY (_start)
1: movl (%esp), %ebx
ret
#endif
-END (_start)
+END (START)
+#ifndef LIBC_MAIN
/* To fulfill the System V/i386 ABI we need this symbol. Yuck, it's so
meaningless since we don't support machines < 80386. */
.section .rodata
@@ -149,3 +162,4 @@ __data_start:
.long 0
.weak data_start
data_start = __data_start
+#endif
@@ -49,6 +49,7 @@ ld.so: _dl_init_first
ld.so: _dl_mcount
ld.so: ___tls_get_addr
ld.so: __tunable_get_val
+ld.so: __tunable_update_val
#
# These should ideally be avoided, but is currently difficult
libc.so: siglongjmp ?
@@ -1,9 +1,11 @@
ifeq ($(subdir),csu)
gen-as-const-headers += cpu-features-offsets.sym
+CPPFLAGS-version.c = -DLIBC_MAIN=__libc_main_body
+CPPFLAGS-libc-main.S = -DLIBC_MAIN=__libc_main_body
endif
ifeq ($(subdir),elf)
-sysdep-dl-routines += dl-get-cpu-features
+sysdep-dl-routines += dl-get-cpu-features dl-cacheinfo
tests += tst-get-cpu-features tst-get-cpu-features-static
tests-static += tst-get-cpu-features-static
@@ -18,498 +18,9 @@
#if IS_IN (libc)
-#include <assert.h>
-#include <stdbool.h>
-#include <stdlib.h>
#include <unistd.h>
-#include <cpuid.h>
#include <init-arch.h>
-static const struct intel_02_cache_info
-{
- unsigned char idx;
- unsigned char assoc;
- unsigned char linesize;
- unsigned char rel_name;
- unsigned int size;
-} intel_02_known [] =
- {
-#define M(sc) ((sc) - _SC_LEVEL1_ICACHE_SIZE)
- { 0x06, 4, 32, M(_SC_LEVEL1_ICACHE_SIZE), 8192 },
- { 0x08, 4, 32, M(_SC_LEVEL1_ICACHE_SIZE), 16384 },
- { 0x09, 4, 32, M(_SC_LEVEL1_ICACHE_SIZE), 32768 },
- { 0x0a, 2, 32, M(_SC_LEVEL1_DCACHE_SIZE), 8192 },
- { 0x0c, 4, 32, M(_SC_LEVEL1_DCACHE_SIZE), 16384 },
- { 0x0d, 4, 64, M(_SC_LEVEL1_DCACHE_SIZE), 16384 },
- { 0x0e, 6, 64, M(_SC_LEVEL1_DCACHE_SIZE), 24576 },
- { 0x21, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
- { 0x22, 4, 64, M(_SC_LEVEL3_CACHE_SIZE), 524288 },
- { 0x23, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 1048576 },
- { 0x25, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 2097152 },
- { 0x29, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 4194304 },
- { 0x2c, 8, 64, M(_SC_LEVEL1_DCACHE_SIZE), 32768 },
- { 0x30, 8, 64, M(_SC_LEVEL1_ICACHE_SIZE), 32768 },
- { 0x39, 4, 64, M(_SC_LEVEL2_CACHE_SIZE), 131072 },
- { 0x3a, 6, 64, M(_SC_LEVEL2_CACHE_SIZE), 196608 },
- { 0x3b, 2, 64, M(_SC_LEVEL2_CACHE_SIZE), 131072 },
- { 0x3c, 4, 64, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
- { 0x3d, 6, 64, M(_SC_LEVEL2_CACHE_SIZE), 393216 },
- { 0x3e, 4, 64, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
- { 0x3f, 2, 64, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
- { 0x41, 4, 32, M(_SC_LEVEL2_CACHE_SIZE), 131072 },
- { 0x42, 4, 32, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
- { 0x43, 4, 32, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
- { 0x44, 4, 32, M(_SC_LEVEL2_CACHE_SIZE), 1048576 },
- { 0x45, 4, 32, M(_SC_LEVEL2_CACHE_SIZE), 2097152 },
- { 0x46, 4, 64, M(_SC_LEVEL3_CACHE_SIZE), 4194304 },
- { 0x47, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 8388608 },
- { 0x48, 12, 64, M(_SC_LEVEL2_CACHE_SIZE), 3145728 },
- { 0x49, 16, 64, M(_SC_LEVEL2_CACHE_SIZE), 4194304 },
- { 0x4a, 12, 64, M(_SC_LEVEL3_CACHE_SIZE), 6291456 },
- { 0x4b, 16, 64, M(_SC_LEVEL3_CACHE_SIZE), 8388608 },
- { 0x4c, 12, 64, M(_SC_LEVEL3_CACHE_SIZE), 12582912 },
- { 0x4d, 16, 64, M(_SC_LEVEL3_CACHE_SIZE), 16777216 },
- { 0x4e, 24, 64, M(_SC_LEVEL2_CACHE_SIZE), 6291456 },
- { 0x60, 8, 64, M(_SC_LEVEL1_DCACHE_SIZE), 16384 },
- { 0x66, 4, 64, M(_SC_LEVEL1_DCACHE_SIZE), 8192 },
- { 0x67, 4, 64, M(_SC_LEVEL1_DCACHE_SIZE), 16384 },
- { 0x68, 4, 64, M(_SC_LEVEL1_DCACHE_SIZE), 32768 },
- { 0x78, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 1048576 },
- { 0x79, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 131072 },
- { 0x7a, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
- { 0x7b, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
- { 0x7c, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 1048576 },
- { 0x7d, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 2097152 },
- { 0x7f, 2, 64, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
- { 0x80, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
- { 0x82, 8, 32, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
- { 0x83, 8, 32, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
- { 0x84, 8, 32, M(_SC_LEVEL2_CACHE_SIZE), 1048576 },
- { 0x85, 8, 32, M(_SC_LEVEL2_CACHE_SIZE), 2097152 },
- { 0x86, 4, 64, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
- { 0x87, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 1048576 },
- { 0xd0, 4, 64, M(_SC_LEVEL3_CACHE_SIZE), 524288 },
- { 0xd1, 4, 64, M(_SC_LEVEL3_CACHE_SIZE), 1048576 },
- { 0xd2, 4, 64, M(_SC_LEVEL3_CACHE_SIZE), 2097152 },
- { 0xd6, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 1048576 },
- { 0xd7, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 2097152 },
- { 0xd8, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 4194304 },
- { 0xdc, 12, 64, M(_SC_LEVEL3_CACHE_SIZE), 2097152 },
- { 0xdd, 12, 64, M(_SC_LEVEL3_CACHE_SIZE), 4194304 },
- { 0xde, 12, 64, M(_SC_LEVEL3_CACHE_SIZE), 8388608 },
- { 0xe2, 16, 64, M(_SC_LEVEL3_CACHE_SIZE), 2097152 },
- { 0xe3, 16, 64, M(_SC_LEVEL3_CACHE_SIZE), 4194304 },
- { 0xe4, 16, 64, M(_SC_LEVEL3_CACHE_SIZE), 8388608 },
- { 0xea, 24, 64, M(_SC_LEVEL3_CACHE_SIZE), 12582912 },
- { 0xeb, 24, 64, M(_SC_LEVEL3_CACHE_SIZE), 18874368 },
- { 0xec, 24, 64, M(_SC_LEVEL3_CACHE_SIZE), 25165824 },
- };
-
-#define nintel_02_known (sizeof (intel_02_known) / sizeof (intel_02_known [0]))
-
-static int
-intel_02_known_compare (const void *p1, const void *p2)
-{
- const struct intel_02_cache_info *i1;
- const struct intel_02_cache_info *i2;
-
- i1 = (const struct intel_02_cache_info *) p1;
- i2 = (const struct intel_02_cache_info *) p2;
-
- if (i1->idx == i2->idx)
- return 0;
-
- return i1->idx < i2->idx ? -1 : 1;
-}
-
-
-static long int
-__attribute__ ((noinline))
-intel_check_word (int name, unsigned int value, bool *has_level_2,
- bool *no_level_2_or_3,
- const struct cpu_features *cpu_features)
-{
- if ((value & 0x80000000) != 0)
- /* The register value is reserved. */
- return 0;
-
- /* Fold the name. The _SC_ constants are always in the order SIZE,
- ASSOC, LINESIZE. */
- int folded_rel_name = (M(name) / 3) * 3;
-
- while (value != 0)
- {
- unsigned int byte = value & 0xff;
-
- if (byte == 0x40)
- {
- *no_level_2_or_3 = true;
-
- if (folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE))
- /* No need to look further. */
- break;
- }
- else if (byte == 0xff)
- {
- /* CPUID leaf 0x4 contains all the information. We need to
- iterate over it. */
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
-
- unsigned int round = 0;
- while (1)
- {
- __cpuid_count (4, round, eax, ebx, ecx, edx);
-
- enum { null = 0, data = 1, inst = 2, uni = 3 } type = eax & 0x1f;
- if (type == null)
- /* That was the end. */
- break;
-
- unsigned int level = (eax >> 5) & 0x7;
-
- if ((level == 1 && type == data
- && folded_rel_name == M(_SC_LEVEL1_DCACHE_SIZE))
- || (level == 1 && type == inst
- && folded_rel_name == M(_SC_LEVEL1_ICACHE_SIZE))
- || (level == 2 && folded_rel_name == M(_SC_LEVEL2_CACHE_SIZE))
- || (level == 3 && folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE))
- || (level == 4 && folded_rel_name == M(_SC_LEVEL4_CACHE_SIZE)))
- {
- unsigned int offset = M(name) - folded_rel_name;
-
- if (offset == 0)
- /* Cache size. */
- return (((ebx >> 22) + 1)
- * (((ebx >> 12) & 0x3ff) + 1)
- * ((ebx & 0xfff) + 1)
- * (ecx + 1));
- if (offset == 1)
- return (ebx >> 22) + 1;
-
- assert (offset == 2);
- return (ebx & 0xfff) + 1;
- }
-
- ++round;
- }
- /* There is no other cache information anywhere else. */
- break;
- }
- else
- {
- if (byte == 0x49 && folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE))
- {
- /* Intel reused this value. For family 15, model 6 it
- specifies the 3rd level cache. Otherwise the 2nd
- level cache. */
- unsigned int family = cpu_features->basic.family;
- unsigned int model = cpu_features->basic.model;
-
- if (family == 15 && model == 6)
- {
- /* The level 3 cache is encoded for this model like
- the level 2 cache is for other models. Pretend
- the caller asked for the level 2 cache. */
- name = (_SC_LEVEL2_CACHE_SIZE
- + (name - _SC_LEVEL3_CACHE_SIZE));
- folded_rel_name = M(_SC_LEVEL2_CACHE_SIZE);
- }
- }
-
- struct intel_02_cache_info *found;
- struct intel_02_cache_info search;
-
- search.idx = byte;
- found = bsearch (&search, intel_02_known, nintel_02_known,
- sizeof (intel_02_known[0]), intel_02_known_compare);
- if (found != NULL)
- {
- if (found->rel_name == folded_rel_name)
- {
- unsigned int offset = M(name) - folded_rel_name;
-
- if (offset == 0)
- /* Cache size. */
- return found->size;
- if (offset == 1)
- return found->assoc;
-
- assert (offset == 2);
- return found->linesize;
- }
-
- if (found->rel_name == M(_SC_LEVEL2_CACHE_SIZE))
- *has_level_2 = true;
- }
- }
-
- /* Next byte for the next round. */
- value >>= 8;
- }
-
- /* Nothing found. */
- return 0;
-}
-
-
-static long int __attribute__ ((noinline))
-handle_intel (int name, const struct cpu_features *cpu_features)
-{
- unsigned int maxidx = cpu_features->basic.max_cpuid;
-
- /* Return -1 for older CPUs. */
- if (maxidx < 2)
- return -1;
-
- /* OK, we can use the CPUID instruction to get all info about the
- caches. */
- unsigned int cnt = 0;
- unsigned int max = 1;
- long int result = 0;
- bool no_level_2_or_3 = false;
- bool has_level_2 = false;
-
- while (cnt++ < max)
- {
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- __cpuid (2, eax, ebx, ecx, edx);
-
- /* The low byte of EAX in the first round contain the number of
- rounds we have to make. At least one, the one we are already
- doing. */
- if (cnt == 1)
- {
- max = eax & 0xff;
- eax &= 0xffffff00;
- }
-
- /* Process the individual registers' value. */
- result = intel_check_word (name, eax, &has_level_2,
- &no_level_2_or_3, cpu_features);
- if (result != 0)
- return result;
-
- result = intel_check_word (name, ebx, &has_level_2,
- &no_level_2_or_3, cpu_features);
- if (result != 0)
- return result;
-
- result = intel_check_word (name, ecx, &has_level_2,
- &no_level_2_or_3, cpu_features);
- if (result != 0)
- return result;
-
- result = intel_check_word (name, edx, &has_level_2,
- &no_level_2_or_3, cpu_features);
- if (result != 0)
- return result;
- }
-
- if (name >= _SC_LEVEL2_CACHE_SIZE && name <= _SC_LEVEL3_CACHE_LINESIZE
- && no_level_2_or_3)
- return -1;
-
- return 0;
-}
-
-
-static long int __attribute__ ((noinline))
-handle_amd (int name)
-{
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- __cpuid (0x80000000, eax, ebx, ecx, edx);
-
- /* No level 4 cache (yet). */
- if (name > _SC_LEVEL3_CACHE_LINESIZE)
- return 0;
-
- unsigned int fn = 0x80000005 + (name >= _SC_LEVEL2_CACHE_SIZE);
- if (eax < fn)
- return 0;
-
- __cpuid (fn, eax, ebx, ecx, edx);
-
- if (name < _SC_LEVEL1_DCACHE_SIZE)
- {
- name += _SC_LEVEL1_DCACHE_SIZE - _SC_LEVEL1_ICACHE_SIZE;
- ecx = edx;
- }
-
- switch (name)
- {
- case _SC_LEVEL1_DCACHE_SIZE:
- return (ecx >> 14) & 0x3fc00;
-
- case _SC_LEVEL1_DCACHE_ASSOC:
- ecx >>= 16;
- if ((ecx & 0xff) == 0xff)
- /* Fully associative. */
- return (ecx << 2) & 0x3fc00;
- return ecx & 0xff;
-
- case _SC_LEVEL1_DCACHE_LINESIZE:
- return ecx & 0xff;
-
- case _SC_LEVEL2_CACHE_SIZE:
- return (ecx & 0xf000) == 0 ? 0 : (ecx >> 6) & 0x3fffc00;
-
- case _SC_LEVEL2_CACHE_ASSOC:
- switch ((ecx >> 12) & 0xf)
- {
- case 0:
- case 1:
- case 2:
- case 4:
- return (ecx >> 12) & 0xf;
- case 6:
- return 8;
- case 8:
- return 16;
- case 10:
- return 32;
- case 11:
- return 48;
- case 12:
- return 64;
- case 13:
- return 96;
- case 14:
- return 128;
- case 15:
- return ((ecx >> 6) & 0x3fffc00) / (ecx & 0xff);
- default:
- return 0;
- }
- /* NOTREACHED */
-
- case _SC_LEVEL2_CACHE_LINESIZE:
- return (ecx & 0xf000) == 0 ? 0 : ecx & 0xff;
-
- case _SC_LEVEL3_CACHE_SIZE:
- return (edx & 0xf000) == 0 ? 0 : (edx & 0x3ffc0000) << 1;
-
- case _SC_LEVEL3_CACHE_ASSOC:
- switch ((edx >> 12) & 0xf)
- {
- case 0:
- case 1:
- case 2:
- case 4:
- return (edx >> 12) & 0xf;
- case 6:
- return 8;
- case 8:
- return 16;
- case 10:
- return 32;
- case 11:
- return 48;
- case 12:
- return 64;
- case 13:
- return 96;
- case 14:
- return 128;
- case 15:
- return ((edx & 0x3ffc0000) << 1) / (edx & 0xff);
- default:
- return 0;
- }
- /* NOTREACHED */
-
- case _SC_LEVEL3_CACHE_LINESIZE:
- return (edx & 0xf000) == 0 ? 0 : edx & 0xff;
-
- default:
- assert (! "cannot happen");
- }
- return -1;
-}
-
-
-static long int __attribute__ ((noinline))
-handle_zhaoxin (int name)
-{
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
-
- int folded_rel_name = (M(name) / 3) * 3;
-
- unsigned int round = 0;
- while (1)
- {
- __cpuid_count (4, round, eax, ebx, ecx, edx);
-
- enum { null = 0, data = 1, inst = 2, uni = 3 } type = eax & 0x1f;
- if (type == null)
- break;
-
- unsigned int level = (eax >> 5) & 0x7;
-
- if ((level == 1 && type == data
- && folded_rel_name == M(_SC_LEVEL1_DCACHE_SIZE))
- || (level == 1 && type == inst
- && folded_rel_name == M(_SC_LEVEL1_ICACHE_SIZE))
- || (level == 2 && folded_rel_name == M(_SC_LEVEL2_CACHE_SIZE))
- || (level == 3 && folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE)))
- {
- unsigned int offset = M(name) - folded_rel_name;
-
- if (offset == 0)
- /* Cache size. */
- return (((ebx >> 22) + 1)
- * (((ebx >> 12) & 0x3ff) + 1)
- * ((ebx & 0xfff) + 1)
- * (ecx + 1));
- if (offset == 1)
- return (ebx >> 22) + 1;
-
- assert (offset == 2);
- return (ebx & 0xfff) + 1;
- }
-
- ++round;
- }
-
- /* Nothing found. */
- return 0;
-}
-
-
-/* Get the value of the system variable NAME. */
-long int
-attribute_hidden
-__cache_sysconf (int name)
-{
- const struct cpu_features *cpu_features = __get_cpu_features ();
-
- if (cpu_features->basic.kind == arch_kind_intel)
- return handle_intel (name, cpu_features);
-
- if (cpu_features->basic.kind == arch_kind_amd)
- return handle_amd (name);
-
- if (cpu_features->basic.kind == arch_kind_zhaoxin)
- return handle_zhaoxin (name);
-
- // XXX Fill in more vendors.
-
- /* CPU not known, we have no information. */
- return 0;
-}
-
-
/* Data cache size for use in memory and string routines, typically
L1 size, rounded to multiple of 256 bytes. */
long int __x86_data_cache_size_half attribute_hidden = 32 * 1024 / 2;
@@ -530,348 +41,85 @@ long int __x86_raw_shared_cache_size attribute_hidden = 1024 * 1024;
/* Threshold to use non temporal store. */
long int __x86_shared_non_temporal_threshold attribute_hidden;
-#ifndef DISABLE_PREFETCHW
+#ifndef __x86_64__
/* PREFETCHW support flag for use in memory and string routines. */
int __x86_prefetchw attribute_hidden;
#endif
-
-static void
-get_common_cache_info (long int *shared_ptr, unsigned int *threads_ptr,
- long int core)
+/* Get the value of the system variable NAME. */
+long int
+attribute_hidden
+__cache_sysconf (int name)
{
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
-
- /* Number of logical processors sharing L2 cache. */
- int threads_l2;
-
- /* Number of logical processors sharing L3 cache. */
- int threads_l3;
-
const struct cpu_features *cpu_features = __get_cpu_features ();
- int max_cpuid = cpu_features->basic.max_cpuid;
- unsigned int family = cpu_features->basic.family;
- unsigned int model = cpu_features->basic.model;
- long int shared = *shared_ptr;
- unsigned int threads = *threads_ptr;
- bool inclusive_cache = true;
- bool support_count_mask = true;
-
- /* Try L3 first. */
- unsigned int level = 3;
-
- if (cpu_features->basic.kind == arch_kind_zhaoxin && family == 6)
- support_count_mask = false;
-
- if (shared <= 0)
- {
- /* Try L2 otherwise. */
- level = 2;
- shared = core;
- threads_l2 = 0;
- threads_l3 = -1;
- }
- else
- {
- threads_l2 = 0;
- threads_l3 = 0;
- }
-
- /* A value of 0 for the HTT bit indicates there is only a single
- logical processor. */
- if (HAS_CPU_FEATURE (HTT))
+ switch (name)
{
- /* Figure out the number of logical threads that share the
- highest cache level. */
- if (max_cpuid >= 4)
- {
- int i = 0;
-
- /* Query until cache level 2 and 3 are enumerated. */
- int check = 0x1 | (threads_l3 == 0) << 1;
- do
- {
- __cpuid_count (4, i++, eax, ebx, ecx, edx);
+ case _SC_LEVEL1_ICACHE_SIZE:
+ return cpu_features->level1_icache_size;
- /* There seems to be a bug in at least some Pentium Ds
- which sometimes fail to iterate all cache parameters.
- Do not loop indefinitely here, stop in this case and
- assume there is no such information. */
- if (cpu_features->basic.kind == arch_kind_intel
- && (eax & 0x1f) == 0 )
- goto intel_bug_no_cache_info;
+ case _SC_LEVEL1_DCACHE_SIZE:
+ return cpu_features->level1_dcache_size;
- switch ((eax >> 5) & 0x7)
- {
- default:
- break;
- case 2:
- if ((check & 0x1))
- {
- /* Get maximum number of logical processors
- sharing L2 cache. */
- threads_l2 = (eax >> 14) & 0x3ff;
- check &= ~0x1;
- }
- break;
- case 3:
- if ((check & (0x1 << 1)))
- {
- /* Get maximum number of logical processors
- sharing L3 cache. */
- threads_l3 = (eax >> 14) & 0x3ff;
+ case _SC_LEVEL1_DCACHE_ASSOC:
+ return cpu_features->level1_dcache_assoc;
- /* Check if L2 and L3 caches are inclusive. */
- inclusive_cache = (edx & 0x2) != 0;
- check &= ~(0x1 << 1);
- }
- break;
- }
- }
- while (check);
+ case _SC_LEVEL1_DCACHE_LINESIZE:
+ return cpu_features->level1_dcache_linesize;
- /* If max_cpuid >= 11, THREADS_L2/THREADS_L3 are the maximum
- numbers of addressable IDs for logical processors sharing
- the cache, instead of the maximum number of threads
- sharing the cache. */
- if (max_cpuid >= 11 && support_count_mask)
- {
- /* Find the number of logical processors shipped in
- one core and apply count mask. */
- i = 0;
+ case _SC_LEVEL2_CACHE_SIZE:
+ return cpu_features->level2_cache_size;
- /* Count SMT only if there is L3 cache. Always count
- core if there is no L3 cache. */
- int count = ((threads_l2 > 0 && level == 3)
- | ((threads_l3 > 0
- || (threads_l2 > 0 && level == 2)) << 1));
+ case _SC_LEVEL2_CACHE_ASSOC:
+ return cpu_features->level2_cache_assoc;
- while (count)
- {
- __cpuid_count (11, i++, eax, ebx, ecx, edx);
+ case _SC_LEVEL2_CACHE_LINESIZE:
+ return cpu_features->level2_cache_linesize;
- int shipped = ebx & 0xff;
- int type = ecx & 0xff00;
- if (shipped == 0 || type == 0)
- break;
- else if (type == 0x100)
- {
- /* Count SMT. */
- if ((count & 0x1))
- {
- int count_mask;
+ case _SC_LEVEL3_CACHE_SIZE:
+ return cpu_features->level3_cache_size;
- /* Compute count mask. */
- asm ("bsr %1, %0"
- : "=r" (count_mask) : "g" (threads_l2));
- count_mask = ~(-1 << (count_mask + 1));
- threads_l2 = (shipped - 1) & count_mask;
- count &= ~0x1;
- }
- }
- else if (type == 0x200)
- {
- /* Count core. */
- if ((count & (0x1 << 1)))
- {
- int count_mask;
- int threads_core
- = (level == 2 ? threads_l2 : threads_l3);
+ case _SC_LEVEL3_CACHE_ASSOC:
+ return cpu_features->level3_cache_assoc;
- /* Compute count mask. */
- asm ("bsr %1, %0"
- : "=r" (count_mask) : "g" (threads_core));
- count_mask = ~(-1 << (count_mask + 1));
- threads_core = (shipped - 1) & count_mask;
- if (level == 2)
- threads_l2 = threads_core;
- else
- threads_l3 = threads_core;
- count &= ~(0x1 << 1);
- }
- }
- }
- }
- if (threads_l2 > 0)
- threads_l2 += 1;
- if (threads_l3 > 0)
- threads_l3 += 1;
- if (level == 2)
- {
- if (threads_l2)
- {
- threads = threads_l2;
- if (cpu_features->basic.kind == arch_kind_intel
- && threads > 2
- && family == 6)
- switch (model)
- {
- case 0x37:
- case 0x4a:
- case 0x4d:
- case 0x5a:
- case 0x5d:
- /* Silvermont has L2 cache shared by 2 cores. */
- threads = 2;
- break;
- default:
- break;
- }
- }
- }
- else if (threads_l3)
- threads = threads_l3;
- }
- else
- {
-intel_bug_no_cache_info:
- /* Assume that all logical threads share the highest cache
- level. */
- threads
- = ((cpu_features->cpuid[COMMON_CPUID_INDEX_1].ebx
- >> 16) & 0xff);
- }
+ case _SC_LEVEL3_CACHE_LINESIZE:
+ return cpu_features->level3_cache_linesize;
- /* Cap usage of highest cache level to the number of supported
- threads. */
- if (shared > 0 && threads > 0)
- shared /= threads;
- }
+ case _SC_LEVEL4_CACHE_SIZE:
+ return cpu_features->level4_cache_size;
- /* Account for non-inclusive L2 and L3 caches. */
- if (!inclusive_cache)
- {
- if (threads_l2 > 0)
- core /= threads_l2;
- shared += core;
+ default:
+ break;
}
-
- *shared_ptr = shared;
- *threads_ptr = threads;
+ return -1;
}
-
static void
__attribute__((constructor))
init_cacheinfo (void)
{
- /* Find out what brand of processor. */
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- int max_cpuid_ex;
- long int data = -1;
- long int shared = -1;
- long int core;
- unsigned int threads = 0;
const struct cpu_features *cpu_features = __get_cpu_features ();
+ long int data = cpu_features->data_cache_size;
+ __x86_raw_data_cache_size_half = data / 2;
+ __x86_raw_data_cache_size = data;
+ /* Round data cache size to multiple of 256 bytes. */
+ data = data & ~255L;
+ __x86_data_cache_size_half = data / 2;
+ __x86_data_cache_size = data;
+
+ long int shared = cpu_features->shared_cache_size;
+ __x86_raw_shared_cache_size_half = shared / 2;
+ __x86_raw_shared_cache_size = shared;
+ /* Round shared cache size to multiple of 256 bytes. */
+ shared = shared & ~255L;
+ __x86_shared_cache_size_half = shared / 2;
+ __x86_shared_cache_size = shared;
- if (cpu_features->basic.kind == arch_kind_intel)
- {
- data = handle_intel (_SC_LEVEL1_DCACHE_SIZE, cpu_features);
- core = handle_intel (_SC_LEVEL2_CACHE_SIZE, cpu_features);
- shared = handle_intel (_SC_LEVEL3_CACHE_SIZE, cpu_features);
-
- get_common_cache_info (&shared, &threads, core);
- }
- else if (cpu_features->basic.kind == arch_kind_zhaoxin)
- {
- data = handle_zhaoxin (_SC_LEVEL1_DCACHE_SIZE);
- core = handle_zhaoxin (_SC_LEVEL2_CACHE_SIZE);
- shared = handle_zhaoxin (_SC_LEVEL3_CACHE_SIZE);
-
- get_common_cache_info (&shared, &threads, core);
- }
- else if (cpu_features->basic.kind == arch_kind_amd)
- {
- data = handle_amd (_SC_LEVEL1_DCACHE_SIZE);
- long int core = handle_amd (_SC_LEVEL2_CACHE_SIZE);
- shared = handle_amd (_SC_LEVEL3_CACHE_SIZE);
-
- /* Get maximum extended function. */
- __cpuid (0x80000000, max_cpuid_ex, ebx, ecx, edx);
-
- if (shared <= 0)
- /* No shared L3 cache. All we have is the L2 cache. */
- shared = core;
- else
- {
- /* Figure out the number of logical threads that share L3. */
- if (max_cpuid_ex >= 0x80000008)
- {
- /* Get width of APIC ID. */
- __cpuid (0x80000008, max_cpuid_ex, ebx, ecx, edx);
- threads = 1 << ((ecx >> 12) & 0x0f);
- }
-
- if (threads == 0)
- {
- /* If APIC ID width is not available, use logical
- processor count. */
- __cpuid (0x00000001, max_cpuid_ex, ebx, ecx, edx);
-
- if ((edx & (1 << 28)) != 0)
- threads = (ebx >> 16) & 0xff;
- }
-
- /* Cap usage of highest cache level to the number of
- supported threads. */
- if (threads > 0)
- shared /= threads;
-
- /* Account for exclusive L2 and L3 caches. */
- shared += core;
- }
+ __x86_shared_non_temporal_threshold
+ = cpu_features->non_temporal_threshold;
-#ifndef DISABLE_PREFETCHW
- if (max_cpuid_ex >= 0x80000001)
- {
- unsigned int eax;
- __cpuid (0x80000001, eax, ebx, ecx, edx);
- /* PREFETCHW || 3DNow! */
- if ((ecx & 0x100) || (edx & 0x80000000))
- __x86_prefetchw = -1;
- }
+#ifndef __x86_64__
+ __x86_prefetchw = cpu_features->prefetchw;
#endif
- }
-
- if (cpu_features->data_cache_size != 0)
- data = cpu_features->data_cache_size;
-
- if (data > 0)
- {
- __x86_raw_data_cache_size_half = data / 2;
- __x86_raw_data_cache_size = data;
- /* Round data cache size to multiple of 256 bytes. */
- data = data & ~255L;
- __x86_data_cache_size_half = data / 2;
- __x86_data_cache_size = data;
- }
-
- if (cpu_features->shared_cache_size != 0)
- shared = cpu_features->shared_cache_size;
-
- if (shared > 0)
- {
- __x86_raw_shared_cache_size_half = shared / 2;
- __x86_raw_shared_cache_size = shared;
- /* Round shared cache size to multiple of 256 bytes. */
- shared = shared & ~255L;
- __x86_shared_cache_size_half = shared / 2;
- __x86_shared_cache_size = shared;
- }
-
- /* The large memcpy micro benchmark in glibc shows that 6 times of
- shared cache size is the approximate value above which non-temporal
- store becomes faster on a 8-core processor. This is the 3/4 of the
- total shared cache size. */
- __x86_shared_non_temporal_threshold
- = (cpu_features->non_temporal_threshold != 0
- ? cpu_features->non_temporal_threshold
- : __x86_shared_cache_size * threads * 3 / 4);
}
#endif
@@ -19,6 +19,7 @@
#include <cpuid.h>
#include <cpu-features.h>
#include <dl-hwcap.h>
+#include <init-arch.h>
#include <libc-pointer-arith.h>
#if HAVE_TUNABLES
@@ -560,20 +561,14 @@ no_cpuid:
cpu_features->basic.model = model;
cpu_features->basic.stepping = stepping;
+ __init_cacheinfo ();
+
#if HAVE_TUNABLES
TUNABLE_GET (hwcaps, tunable_val_t *, TUNABLE_CALLBACK (set_hwcaps));
- cpu_features->non_temporal_threshold
- = TUNABLE_GET (x86_non_temporal_threshold, long int, NULL);
- cpu_features->data_cache_size
- = TUNABLE_GET (x86_data_cache_size, long int, NULL);
- cpu_features->shared_cache_size
- = TUNABLE_GET (x86_shared_cache_size, long int, NULL);
-#endif
-
- /* Reuse dl_platform, dl_hwcap and dl_hwcap_mask for x86. */
-#if !HAVE_TUNABLES && defined SHARED
- /* The glibc.cpu.hwcap_mask tunable is initialized already, so no need to do
- this. */
+#elif defined SHARED
+ /* Reuse dl_platform, dl_hwcap and dl_hwcap_mask for x86. The
+ glibc.cpu.hwcap_mask tunable is initialized already, so no
+ need to do this. */
GLRO(dl_hwcap_mask) = HWCAP_IMPORTANT;
#endif
@@ -91,6 +91,32 @@ struct cpu_features
unsigned long int shared_cache_size;
/* Threshold to use non temporal store. */
unsigned long int non_temporal_threshold;
+ /* _SC_LEVEL1_ICACHE_SIZE. */
+ unsigned long int level1_icache_size;
+ /* _SC_LEVEL1_DCACHE_SIZE. */
+ unsigned long int level1_dcache_size;
+ /* _SC_LEVEL1_DCACHE_ASSOC. */
+ unsigned long int level1_dcache_assoc;
+ /* _SC_LEVEL1_DCACHE_LINESIZE. */
+ unsigned long int level1_dcache_linesize;
+ /* _SC_LEVEL2_CACHE_ASSOC. */
+ unsigned long int level2_cache_size;
+ /* _SC_LEVEL2_DCACHE_ASSOC. */
+ unsigned long int level2_cache_assoc;
+ /* _SC_LEVEL2_CACHE_LINESIZE. */
+ unsigned long int level2_cache_linesize;
+ /* /_SC_LEVEL3_CACHE_SIZE. */
+ unsigned long int level3_cache_size;
+ /* _SC_LEVEL3_CACHE_ASSOC. */
+ unsigned long int level3_cache_assoc;
+ /* _SC_LEVEL3_CACHE_LINESIZE. */
+ unsigned long int level3_cache_linesize;
+ /* /_SC_LEVEL4_CACHE_SIZE. */
+ unsigned long int level4_cache_size;
+#ifndef __x86_64__
+ /* PREFETCHW support flag for use in memory and string routines. */
+ unsigned long int prefetchw;
+#endif
};
/* Used from outside of glibc to get access to the CPU features
new file mode 100644
@@ -0,0 +1,888 @@
+/* x86 cache info.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <cpuid.h>
+#include <init-arch.h>
+#if HAVE_TUNABLES
+# define TUNABLE_NAMESPACE cpu
+# include <elf/dl-tunables.h>
+#endif
+
+static const struct intel_02_cache_info
+{
+ unsigned char idx;
+ unsigned char assoc;
+ unsigned char linesize;
+ unsigned char rel_name;
+ unsigned int size;
+} intel_02_known [] =
+ {
+#define M(sc) ((sc) - _SC_LEVEL1_ICACHE_SIZE)
+ { 0x06, 4, 32, M(_SC_LEVEL1_ICACHE_SIZE), 8192 },
+ { 0x08, 4, 32, M(_SC_LEVEL1_ICACHE_SIZE), 16384 },
+ { 0x09, 4, 32, M(_SC_LEVEL1_ICACHE_SIZE), 32768 },
+ { 0x0a, 2, 32, M(_SC_LEVEL1_DCACHE_SIZE), 8192 },
+ { 0x0c, 4, 32, M(_SC_LEVEL1_DCACHE_SIZE), 16384 },
+ { 0x0d, 4, 64, M(_SC_LEVEL1_DCACHE_SIZE), 16384 },
+ { 0x0e, 6, 64, M(_SC_LEVEL1_DCACHE_SIZE), 24576 },
+ { 0x21, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
+ { 0x22, 4, 64, M(_SC_LEVEL3_CACHE_SIZE), 524288 },
+ { 0x23, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 1048576 },
+ { 0x25, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 2097152 },
+ { 0x29, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 4194304 },
+ { 0x2c, 8, 64, M(_SC_LEVEL1_DCACHE_SIZE), 32768 },
+ { 0x30, 8, 64, M(_SC_LEVEL1_ICACHE_SIZE), 32768 },
+ { 0x39, 4, 64, M(_SC_LEVEL2_CACHE_SIZE), 131072 },
+ { 0x3a, 6, 64, M(_SC_LEVEL2_CACHE_SIZE), 196608 },
+ { 0x3b, 2, 64, M(_SC_LEVEL2_CACHE_SIZE), 131072 },
+ { 0x3c, 4, 64, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
+ { 0x3d, 6, 64, M(_SC_LEVEL2_CACHE_SIZE), 393216 },
+ { 0x3e, 4, 64, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
+ { 0x3f, 2, 64, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
+ { 0x41, 4, 32, M(_SC_LEVEL2_CACHE_SIZE), 131072 },
+ { 0x42, 4, 32, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
+ { 0x43, 4, 32, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
+ { 0x44, 4, 32, M(_SC_LEVEL2_CACHE_SIZE), 1048576 },
+ { 0x45, 4, 32, M(_SC_LEVEL2_CACHE_SIZE), 2097152 },
+ { 0x46, 4, 64, M(_SC_LEVEL3_CACHE_SIZE), 4194304 },
+ { 0x47, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 8388608 },
+ { 0x48, 12, 64, M(_SC_LEVEL2_CACHE_SIZE), 3145728 },
+ { 0x49, 16, 64, M(_SC_LEVEL2_CACHE_SIZE), 4194304 },
+ { 0x4a, 12, 64, M(_SC_LEVEL3_CACHE_SIZE), 6291456 },
+ { 0x4b, 16, 64, M(_SC_LEVEL3_CACHE_SIZE), 8388608 },
+ { 0x4c, 12, 64, M(_SC_LEVEL3_CACHE_SIZE), 12582912 },
+ { 0x4d, 16, 64, M(_SC_LEVEL3_CACHE_SIZE), 16777216 },
+ { 0x4e, 24, 64, M(_SC_LEVEL2_CACHE_SIZE), 6291456 },
+ { 0x60, 8, 64, M(_SC_LEVEL1_DCACHE_SIZE), 16384 },
+ { 0x66, 4, 64, M(_SC_LEVEL1_DCACHE_SIZE), 8192 },
+ { 0x67, 4, 64, M(_SC_LEVEL1_DCACHE_SIZE), 16384 },
+ { 0x68, 4, 64, M(_SC_LEVEL1_DCACHE_SIZE), 32768 },
+ { 0x78, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 1048576 },
+ { 0x79, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 131072 },
+ { 0x7a, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
+ { 0x7b, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
+ { 0x7c, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 1048576 },
+ { 0x7d, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 2097152 },
+ { 0x7f, 2, 64, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
+ { 0x80, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
+ { 0x82, 8, 32, M(_SC_LEVEL2_CACHE_SIZE), 262144 },
+ { 0x83, 8, 32, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
+ { 0x84, 8, 32, M(_SC_LEVEL2_CACHE_SIZE), 1048576 },
+ { 0x85, 8, 32, M(_SC_LEVEL2_CACHE_SIZE), 2097152 },
+ { 0x86, 4, 64, M(_SC_LEVEL2_CACHE_SIZE), 524288 },
+ { 0x87, 8, 64, M(_SC_LEVEL2_CACHE_SIZE), 1048576 },
+ { 0xd0, 4, 64, M(_SC_LEVEL3_CACHE_SIZE), 524288 },
+ { 0xd1, 4, 64, M(_SC_LEVEL3_CACHE_SIZE), 1048576 },
+ { 0xd2, 4, 64, M(_SC_LEVEL3_CACHE_SIZE), 2097152 },
+ { 0xd6, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 1048576 },
+ { 0xd7, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 2097152 },
+ { 0xd8, 8, 64, M(_SC_LEVEL3_CACHE_SIZE), 4194304 },
+ { 0xdc, 12, 64, M(_SC_LEVEL3_CACHE_SIZE), 2097152 },
+ { 0xdd, 12, 64, M(_SC_LEVEL3_CACHE_SIZE), 4194304 },
+ { 0xde, 12, 64, M(_SC_LEVEL3_CACHE_SIZE), 8388608 },
+ { 0xe2, 16, 64, M(_SC_LEVEL3_CACHE_SIZE), 2097152 },
+ { 0xe3, 16, 64, M(_SC_LEVEL3_CACHE_SIZE), 4194304 },
+ { 0xe4, 16, 64, M(_SC_LEVEL3_CACHE_SIZE), 8388608 },
+ { 0xea, 24, 64, M(_SC_LEVEL3_CACHE_SIZE), 12582912 },
+ { 0xeb, 24, 64, M(_SC_LEVEL3_CACHE_SIZE), 18874368 },
+ { 0xec, 24, 64, M(_SC_LEVEL3_CACHE_SIZE), 25165824 },
+ };
+
+#define nintel_02_known (sizeof (intel_02_known) / sizeof (intel_02_known [0]))
+
+static int
+intel_02_known_compare (const void *p1, const void *p2)
+{
+ const struct intel_02_cache_info *i1;
+ const struct intel_02_cache_info *i2;
+
+ i1 = (const struct intel_02_cache_info *) p1;
+ i2 = (const struct intel_02_cache_info *) p2;
+
+ if (i1->idx == i2->idx)
+ return 0;
+
+ return i1->idx < i2->idx ? -1 : 1;
+}
+
+
+static long int
+__attribute__ ((noinline))
+intel_check_word (int name, unsigned int value, bool *has_level_2,
+ bool *no_level_2_or_3,
+ const struct cpu_features *cpu_features)
+{
+ if ((value & 0x80000000) != 0)
+ /* The register value is reserved. */
+ return 0;
+
+ /* Fold the name. The _SC_ constants are always in the order SIZE,
+ ASSOC, LINESIZE. */
+ int folded_rel_name = (M(name) / 3) * 3;
+
+ while (value != 0)
+ {
+ unsigned int byte = value & 0xff;
+
+ if (byte == 0x40)
+ {
+ *no_level_2_or_3 = true;
+
+ if (folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE))
+ /* No need to look further. */
+ break;
+ }
+ else if (byte == 0xff)
+ {
+ /* CPUID leaf 0x4 contains all the information. We need to
+ iterate over it. */
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+
+ unsigned int round = 0;
+ while (1)
+ {
+ __cpuid_count (4, round, eax, ebx, ecx, edx);
+
+ enum { null = 0, data = 1, inst = 2, uni = 3 } type = eax & 0x1f;
+ if (type == null)
+ /* That was the end. */
+ break;
+
+ unsigned int level = (eax >> 5) & 0x7;
+
+ if ((level == 1 && type == data
+ && folded_rel_name == M(_SC_LEVEL1_DCACHE_SIZE))
+ || (level == 1 && type == inst
+ && folded_rel_name == M(_SC_LEVEL1_ICACHE_SIZE))
+ || (level == 2 && folded_rel_name == M(_SC_LEVEL2_CACHE_SIZE))
+ || (level == 3 && folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE))
+ || (level == 4 && folded_rel_name == M(_SC_LEVEL4_CACHE_SIZE)))
+ {
+ unsigned int offset = M(name) - folded_rel_name;
+
+ if (offset == 0)
+ /* Cache size. */
+ return (((ebx >> 22) + 1)
+ * (((ebx >> 12) & 0x3ff) + 1)
+ * ((ebx & 0xfff) + 1)
+ * (ecx + 1));
+ if (offset == 1)
+ return (ebx >> 22) + 1;
+
+ assert (offset == 2);
+ return (ebx & 0xfff) + 1;
+ }
+
+ ++round;
+ }
+ /* There is no other cache information anywhere else. */
+ break;
+ }
+ else
+ {
+ if (byte == 0x49 && folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE))
+ {
+ /* Intel reused this value. For family 15, model 6 it
+ specifies the 3rd level cache. Otherwise the 2nd
+ level cache. */
+ unsigned int family = cpu_features->basic.family;
+ unsigned int model = cpu_features->basic.model;
+
+ if (family == 15 && model == 6)
+ {
+ /* The level 3 cache is encoded for this model like
+ the level 2 cache is for other models. Pretend
+ the caller asked for the level 2 cache. */
+ name = (_SC_LEVEL2_CACHE_SIZE
+ + (name - _SC_LEVEL3_CACHE_SIZE));
+ folded_rel_name = M(_SC_LEVEL2_CACHE_SIZE);
+ }
+ }
+
+ struct intel_02_cache_info *found;
+ struct intel_02_cache_info search;
+
+ search.idx = byte;
+ found = bsearch (&search, intel_02_known, nintel_02_known,
+ sizeof (intel_02_known[0]), intel_02_known_compare);
+ if (found != NULL)
+ {
+ if (found->rel_name == folded_rel_name)
+ {
+ unsigned int offset = M(name) - folded_rel_name;
+
+ if (offset == 0)
+ /* Cache size. */
+ return found->size;
+ if (offset == 1)
+ return found->assoc;
+
+ assert (offset == 2);
+ return found->linesize;
+ }
+
+ if (found->rel_name == M(_SC_LEVEL2_CACHE_SIZE))
+ *has_level_2 = true;
+ }
+ }
+
+ /* Next byte for the next round. */
+ value >>= 8;
+ }
+
+ /* Nothing found. */
+ return 0;
+}
+
+
+static long int __attribute__ ((noinline))
+handle_intel (int name, const struct cpu_features *cpu_features)
+{
+ unsigned int maxidx = cpu_features->basic.max_cpuid;
+
+ /* Return -1 for older CPUs. */
+ if (maxidx < 2)
+ return -1;
+
+ /* OK, we can use the CPUID instruction to get all info about the
+ caches. */
+ unsigned int cnt = 0;
+ unsigned int max = 1;
+ long int result = 0;
+ bool no_level_2_or_3 = false;
+ bool has_level_2 = false;
+
+ while (cnt++ < max)
+ {
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+ __cpuid (2, eax, ebx, ecx, edx);
+
+ /* The low byte of EAX in the first round contain the number of
+ rounds we have to make. At least one, the one we are already
+ doing. */
+ if (cnt == 1)
+ {
+ max = eax & 0xff;
+ eax &= 0xffffff00;
+ }
+
+ /* Process the individual registers' value. */
+ result = intel_check_word (name, eax, &has_level_2,
+ &no_level_2_or_3, cpu_features);
+ if (result != 0)
+ return result;
+
+ result = intel_check_word (name, ebx, &has_level_2,
+ &no_level_2_or_3, cpu_features);
+ if (result != 0)
+ return result;
+
+ result = intel_check_word (name, ecx, &has_level_2,
+ &no_level_2_or_3, cpu_features);
+ if (result != 0)
+ return result;
+
+ result = intel_check_word (name, edx, &has_level_2,
+ &no_level_2_or_3, cpu_features);
+ if (result != 0)
+ return result;
+ }
+
+ if (name >= _SC_LEVEL2_CACHE_SIZE && name <= _SC_LEVEL3_CACHE_LINESIZE
+ && no_level_2_or_3)
+ return -1;
+
+ return 0;
+}
+
+
+static long int __attribute__ ((noinline))
+handle_amd (int name)
+{
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+ __cpuid (0x80000000, eax, ebx, ecx, edx);
+
+ /* No level 4 cache (yet). */
+ if (name > _SC_LEVEL3_CACHE_LINESIZE)
+ return 0;
+
+ unsigned int fn = 0x80000005 + (name >= _SC_LEVEL2_CACHE_SIZE);
+ if (eax < fn)
+ return 0;
+
+ __cpuid (fn, eax, ebx, ecx, edx);
+
+ if (name < _SC_LEVEL1_DCACHE_SIZE)
+ {
+ name += _SC_LEVEL1_DCACHE_SIZE - _SC_LEVEL1_ICACHE_SIZE;
+ ecx = edx;
+ }
+
+ switch (name)
+ {
+ case _SC_LEVEL1_DCACHE_SIZE:
+ return (ecx >> 14) & 0x3fc00;
+
+ case _SC_LEVEL1_DCACHE_ASSOC:
+ ecx >>= 16;
+ if ((ecx & 0xff) == 0xff)
+ /* Fully associative. */
+ return (ecx << 2) & 0x3fc00;
+ return ecx & 0xff;
+
+ case _SC_LEVEL1_DCACHE_LINESIZE:
+ return ecx & 0xff;
+
+ case _SC_LEVEL2_CACHE_SIZE:
+ return (ecx & 0xf000) == 0 ? 0 : (ecx >> 6) & 0x3fffc00;
+
+ case _SC_LEVEL2_CACHE_ASSOC:
+ switch ((ecx >> 12) & 0xf)
+ {
+ case 0:
+ case 1:
+ case 2:
+ case 4:
+ return (ecx >> 12) & 0xf;
+ case 6:
+ return 8;
+ case 8:
+ return 16;
+ case 10:
+ return 32;
+ case 11:
+ return 48;
+ case 12:
+ return 64;
+ case 13:
+ return 96;
+ case 14:
+ return 128;
+ case 15:
+ return ((ecx >> 6) & 0x3fffc00) / (ecx & 0xff);
+ default:
+ return 0;
+ }
+ /* NOTREACHED */
+
+ case _SC_LEVEL2_CACHE_LINESIZE:
+ return (ecx & 0xf000) == 0 ? 0 : ecx & 0xff;
+
+ case _SC_LEVEL3_CACHE_SIZE:
+ return (edx & 0xf000) == 0 ? 0 : (edx & 0x3ffc0000) << 1;
+
+ case _SC_LEVEL3_CACHE_ASSOC:
+ switch ((edx >> 12) & 0xf)
+ {
+ case 0:
+ case 1:
+ case 2:
+ case 4:
+ return (edx >> 12) & 0xf;
+ case 6:
+ return 8;
+ case 8:
+ return 16;
+ case 10:
+ return 32;
+ case 11:
+ return 48;
+ case 12:
+ return 64;
+ case 13:
+ return 96;
+ case 14:
+ return 128;
+ case 15:
+ return ((edx & 0x3ffc0000) << 1) / (edx & 0xff);
+ default:
+ return 0;
+ }
+ /* NOTREACHED */
+
+ case _SC_LEVEL3_CACHE_LINESIZE:
+ return (edx & 0xf000) == 0 ? 0 : edx & 0xff;
+
+ default:
+ assert (! "cannot happen");
+ }
+ return -1;
+}
+
+
+static long int __attribute__ ((noinline))
+handle_zhaoxin (int name)
+{
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+
+ int folded_rel_name = (M(name) / 3) * 3;
+
+ unsigned int round = 0;
+ while (1)
+ {
+ __cpuid_count (4, round, eax, ebx, ecx, edx);
+
+ enum { null = 0, data = 1, inst = 2, uni = 3 } type = eax & 0x1f;
+ if (type == null)
+ break;
+
+ unsigned int level = (eax >> 5) & 0x7;
+
+ if ((level == 1 && type == data
+ && folded_rel_name == M(_SC_LEVEL1_DCACHE_SIZE))
+ || (level == 1 && type == inst
+ && folded_rel_name == M(_SC_LEVEL1_ICACHE_SIZE))
+ || (level == 2 && folded_rel_name == M(_SC_LEVEL2_CACHE_SIZE))
+ || (level == 3 && folded_rel_name == M(_SC_LEVEL3_CACHE_SIZE)))
+ {
+ unsigned int offset = M(name) - folded_rel_name;
+
+ if (offset == 0)
+ /* Cache size. */
+ return (((ebx >> 22) + 1)
+ * (((ebx >> 12) & 0x3ff) + 1)
+ * ((ebx & 0xfff) + 1)
+ * (ecx + 1));
+ if (offset == 1)
+ return (ebx >> 22) + 1;
+
+ assert (offset == 2);
+ return (ebx & 0xfff) + 1;
+ }
+
+ ++round;
+ }
+
+ /* Nothing found. */
+ return 0;
+}
+
+
+static void
+get_common_cache_info (long int *shared_ptr, unsigned int *threads_ptr,
+ long int core)
+{
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+
+ /* Number of logical processors sharing L2 cache. */
+ int threads_l2;
+
+ /* Number of logical processors sharing L3 cache. */
+ int threads_l3;
+
+ const struct cpu_features *cpu_features = __get_cpu_features ();
+ int max_cpuid = cpu_features->basic.max_cpuid;
+ unsigned int family = cpu_features->basic.family;
+ unsigned int model = cpu_features->basic.model;
+ long int shared = *shared_ptr;
+ unsigned int threads = *threads_ptr;
+ bool inclusive_cache = true;
+ bool support_count_mask = true;
+
+ /* Try L3 first. */
+ unsigned int level = 3;
+
+ if (cpu_features->basic.kind == arch_kind_zhaoxin && family == 6)
+ support_count_mask = false;
+
+ if (shared <= 0)
+ {
+ /* Try L2 otherwise. */
+ level = 2;
+ shared = core;
+ threads_l2 = 0;
+ threads_l3 = -1;
+ }
+ else
+ {
+ threads_l2 = 0;
+ threads_l3 = 0;
+ }
+
+ /* A value of 0 for the HTT bit indicates there is only a single
+ logical processor. */
+ if (HAS_CPU_FEATURE (HTT))
+ {
+ /* Figure out the number of logical threads that share the
+ highest cache level. */
+ if (max_cpuid >= 4)
+ {
+ int i = 0;
+
+ /* Query until cache level 2 and 3 are enumerated. */
+ int check = 0x1 | (threads_l3 == 0) << 1;
+ do
+ {
+ __cpuid_count (4, i++, eax, ebx, ecx, edx);
+
+ /* There seems to be a bug in at least some Pentium Ds
+ which sometimes fail to iterate all cache parameters.
+ Do not loop indefinitely here, stop in this case and
+ assume there is no such information. */
+ if (cpu_features->basic.kind == arch_kind_intel
+ && (eax & 0x1f) == 0 )
+ goto intel_bug_no_cache_info;
+
+ switch ((eax >> 5) & 0x7)
+ {
+ default:
+ break;
+ case 2:
+ if ((check & 0x1))
+ {
+ /* Get maximum number of logical processors
+ sharing L2 cache. */
+ threads_l2 = (eax >> 14) & 0x3ff;
+ check &= ~0x1;
+ }
+ break;
+ case 3:
+ if ((check & (0x1 << 1)))
+ {
+ /* Get maximum number of logical processors
+ sharing L3 cache. */
+ threads_l3 = (eax >> 14) & 0x3ff;
+
+ /* Check if L2 and L3 caches are inclusive. */
+ inclusive_cache = (edx & 0x2) != 0;
+ check &= ~(0x1 << 1);
+ }
+ break;
+ }
+ }
+ while (check);
+
+ /* If max_cpuid >= 11, THREADS_L2/THREADS_L3 are the maximum
+ numbers of addressable IDs for logical processors sharing
+ the cache, instead of the maximum number of threads
+ sharing the cache. */
+ if (max_cpuid >= 11 && support_count_mask)
+ {
+ /* Find the number of logical processors shipped in
+ one core and apply count mask. */
+ i = 0;
+
+ /* Count SMT only if there is L3 cache. Always count
+ core if there is no L3 cache. */
+ int count = ((threads_l2 > 0 && level == 3)
+ | ((threads_l3 > 0
+ || (threads_l2 > 0 && level == 2)) << 1));
+
+ while (count)
+ {
+ __cpuid_count (11, i++, eax, ebx, ecx, edx);
+
+ int shipped = ebx & 0xff;
+ int type = ecx & 0xff00;
+ if (shipped == 0 || type == 0)
+ break;
+ else if (type == 0x100)
+ {
+ /* Count SMT. */
+ if ((count & 0x1))
+ {
+ int count_mask;
+
+ /* Compute count mask. */
+ asm ("bsr %1, %0"
+ : "=r" (count_mask) : "g" (threads_l2));
+ count_mask = ~(-1 << (count_mask + 1));
+ threads_l2 = (shipped - 1) & count_mask;
+ count &= ~0x1;
+ }
+ }
+ else if (type == 0x200)
+ {
+ /* Count core. */
+ if ((count & (0x1 << 1)))
+ {
+ int count_mask;
+ int threads_core
+ = (level == 2 ? threads_l2 : threads_l3);
+
+ /* Compute count mask. */
+ asm ("bsr %1, %0"
+ : "=r" (count_mask) : "g" (threads_core));
+ count_mask = ~(-1 << (count_mask + 1));
+ threads_core = (shipped - 1) & count_mask;
+ if (level == 2)
+ threads_l2 = threads_core;
+ else
+ threads_l3 = threads_core;
+ count &= ~(0x1 << 1);
+ }
+ }
+ }
+ }
+ if (threads_l2 > 0)
+ threads_l2 += 1;
+ if (threads_l3 > 0)
+ threads_l3 += 1;
+ if (level == 2)
+ {
+ if (threads_l2)
+ {
+ threads = threads_l2;
+ if (cpu_features->basic.kind == arch_kind_intel
+ && threads > 2
+ && family == 6)
+ switch (model)
+ {
+ case 0x37:
+ case 0x4a:
+ case 0x4d:
+ case 0x5a:
+ case 0x5d:
+ /* Silvermont has L2 cache shared by 2 cores. */
+ threads = 2;
+ break;
+ default:
+ break;
+ }
+ }
+ }
+ else if (threads_l3)
+ threads = threads_l3;
+ }
+ else
+ {
+intel_bug_no_cache_info:
+ /* Assume that all logical threads share the highest cache
+ level. */
+ threads
+ = ((cpu_features->cpuid[COMMON_CPUID_INDEX_1].ebx
+ >> 16) & 0xff);
+ }
+
+ /* Cap usage of highest cache level to the number of supported
+ threads. */
+ if (shared > 0 && threads > 0)
+ shared /= threads;
+ }
+
+ /* Account for non-inclusive L2 and L3 caches. */
+ if (!inclusive_cache)
+ {
+ if (threads_l2 > 0)
+ core /= threads_l2;
+ shared += core;
+ }
+
+ *shared_ptr = shared;
+ *threads_ptr = threads;
+}
+
+void
+__init_cacheinfo (void)
+{
+ /* Find out what brand of processor. */
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+ int max_cpuid_ex;
+ long int data = -1;
+ long int shared = -1;
+ long int core;
+ unsigned int threads = 0;
+ unsigned long int level1_icache_size = -1;
+ unsigned long int level1_dcache_size = -1;
+ unsigned long int level1_dcache_assoc = -1;
+ unsigned long int level1_dcache_linesize = -1;
+ unsigned long int level2_cache_size = -1;
+ unsigned long int level2_cache_assoc = -1;
+ unsigned long int level2_cache_linesize = -1;
+ unsigned long int level3_cache_size = -1;
+ unsigned long int level3_cache_assoc = -1;
+ unsigned long int level3_cache_linesize = -1;
+ unsigned long int level4_cache_size = -1;
+ struct cpu_features *cpu_features = __get_cpu_features ();
+
+ if (cpu_features->basic.kind == arch_kind_intel)
+ {
+ data = handle_intel (_SC_LEVEL1_DCACHE_SIZE, cpu_features);
+ core = handle_intel (_SC_LEVEL2_CACHE_SIZE, cpu_features);
+ shared = handle_intel (_SC_LEVEL3_CACHE_SIZE, cpu_features);
+
+ level1_icache_size
+ = handle_intel (_SC_LEVEL1_ICACHE_SIZE, cpu_features);
+ level1_dcache_size = data;
+ level1_dcache_assoc
+ = handle_intel (_SC_LEVEL1_DCACHE_ASSOC, cpu_features);
+ level1_dcache_linesize
+ = handle_intel (_SC_LEVEL1_DCACHE_LINESIZE, cpu_features);
+ level2_cache_size = core;
+ level2_cache_assoc
+ = handle_intel (_SC_LEVEL2_CACHE_ASSOC, cpu_features);
+ level2_cache_linesize
+ = handle_intel (_SC_LEVEL2_CACHE_LINESIZE, cpu_features);
+ level3_cache_size = shared;
+ level3_cache_assoc
+ = handle_intel (_SC_LEVEL3_CACHE_ASSOC, cpu_features);
+ level3_cache_linesize
+ = handle_intel (_SC_LEVEL3_CACHE_LINESIZE, cpu_features);
+ level4_cache_size
+ = handle_intel (_SC_LEVEL4_CACHE_SIZE, cpu_features);
+
+ get_common_cache_info (&shared, &threads, core);
+ }
+ else if (cpu_features->basic.kind == arch_kind_zhaoxin)
+ {
+ data = handle_zhaoxin (_SC_LEVEL1_DCACHE_SIZE);
+ core = handle_zhaoxin (_SC_LEVEL2_CACHE_SIZE);
+ shared = handle_zhaoxin (_SC_LEVEL3_CACHE_SIZE);
+
+ level1_icache_size = handle_zhaoxin (_SC_LEVEL1_ICACHE_SIZE);
+ level1_dcache_size = data;
+ level1_dcache_assoc = handle_zhaoxin (_SC_LEVEL1_DCACHE_ASSOC);
+ level1_dcache_linesize = handle_zhaoxin (_SC_LEVEL1_DCACHE_LINESIZE);
+ level2_cache_size = core;
+ level2_cache_assoc = handle_zhaoxin (_SC_LEVEL2_CACHE_ASSOC);
+ level2_cache_linesize = handle_zhaoxin (_SC_LEVEL2_CACHE_LINESIZE);
+ level3_cache_size = shared;
+ level3_cache_assoc = handle_zhaoxin (_SC_LEVEL3_CACHE_ASSOC);
+ level3_cache_linesize = handle_zhaoxin (_SC_LEVEL3_CACHE_LINESIZE);
+
+ get_common_cache_info (&shared, &threads, core);
+ }
+ else if (cpu_features->basic.kind == arch_kind_amd)
+ {
+ data = handle_amd (_SC_LEVEL1_DCACHE_SIZE);
+ core = handle_amd (_SC_LEVEL2_CACHE_SIZE);
+ shared = handle_amd (_SC_LEVEL3_CACHE_SIZE);
+
+ level1_icache_size = handle_amd (_SC_LEVEL1_ICACHE_SIZE);
+ level1_dcache_size = data;
+ level1_dcache_assoc = handle_amd (_SC_LEVEL1_DCACHE_ASSOC);
+ level1_dcache_linesize = handle_amd (_SC_LEVEL1_DCACHE_LINESIZE);
+ level2_cache_size = core;
+ level2_cache_assoc = handle_amd (_SC_LEVEL2_CACHE_ASSOC);
+ level2_cache_linesize = handle_amd (_SC_LEVEL2_CACHE_LINESIZE);
+ level3_cache_size = shared;
+ level3_cache_assoc = handle_amd (_SC_LEVEL3_CACHE_ASSOC);
+ level3_cache_linesize = handle_amd (_SC_LEVEL3_CACHE_LINESIZE);
+
+ /* Get maximum extended function. */
+ __cpuid (0x80000000, max_cpuid_ex, ebx, ecx, edx);
+
+ if (shared <= 0)
+ /* No shared L3 cache. All we have is the L2 cache. */
+ shared = core;
+ else
+ {
+ /* Figure out the number of logical threads that share L3. */
+ if (max_cpuid_ex >= 0x80000008)
+ {
+ /* Get width of APIC ID. */
+ __cpuid (0x80000008, max_cpuid_ex, ebx, ecx, edx);
+ threads = 1 << ((ecx >> 12) & 0x0f);
+ }
+
+ if (threads == 0)
+ {
+ /* If APIC ID width is not available, use logical
+ processor count. */
+ __cpuid (0x00000001, max_cpuid_ex, ebx, ecx, edx);
+
+ if ((edx & (1 << 28)) != 0)
+ threads = (ebx >> 16) & 0xff;
+ }
+
+ /* Cap usage of highest cache level to the number of
+ supported threads. */
+ if (threads > 0)
+ shared /= threads;
+
+ /* Account for exclusive L2 and L3 caches. */
+ shared += core;
+ }
+
+#ifndef __x86_64__
+ if (max_cpuid_ex >= 0x80000001)
+ {
+ unsigned int eax;
+ __cpuid (0x80000001, eax, ebx, ecx, edx);
+ /* PREFETCHW || 3DNow! */
+ if ((ecx & 0x100) || (edx & 0x80000000))
+ cpu_features->prefetchw = -1;
+ }
+#endif
+ }
+
+ cpu_features->level1_icache_size = level1_icache_size;
+ cpu_features->level1_dcache_size = level1_dcache_size;
+ cpu_features->level1_dcache_assoc = level1_dcache_assoc;
+ cpu_features->level1_dcache_linesize = level1_dcache_linesize;
+ cpu_features->level2_cache_size = level2_cache_size;
+ cpu_features->level2_cache_assoc = level2_cache_assoc;
+ cpu_features->level2_cache_linesize = level2_cache_linesize;
+ cpu_features->level3_cache_size = level3_cache_size;
+ cpu_features->level3_cache_assoc = level3_cache_assoc;
+ cpu_features->level3_cache_linesize = level3_cache_linesize;
+ cpu_features->level4_cache_size = level4_cache_size;
+
+ /* The large memcpy micro benchmark in glibc shows that 6 times of
+ shared cache size is the approximate value above which non-temporal
+ store becomes faster on a 8-core processor. This is the 3/4 of the
+ total shared cache size. */
+ unsigned long int non_temporal_threshold = (shared * threads * 3 / 4);
+
+#if HAVE_TUNABLES
+ long int tunable_size;
+ tunable_size = TUNABLE_GET (x86_data_cache_size, long int, NULL);
+ if (tunable_size != 0)
+ data = tunable_size;
+ tunable_size = TUNABLE_GET (x86_shared_cache_size, long int, NULL);
+ if (tunable_size != 0)
+ shared = tunable_size;
+ tunable_size = TUNABLE_GET (x86_non_temporal_threshold, long int, NULL);
+ if (tunable_size != 0)
+ non_temporal_threshold = tunable_size;
+#endif
+
+ cpu_features->data_cache_size = data;
+ cpu_features->shared_cache_size = shared;
+ cpu_features->non_temporal_threshold = non_temporal_threshold;
+
+#if HAVE_TUNABLES
+ TUNABLE_UPDATE (x86_data_cache_size, long int,
+ data, 0, (long int) -1);
+ TUNABLE_UPDATE (x86_shared_cache_size, long int,
+ shared, 0, (long int) -1);
+ TUNABLE_UPDATE (x86_non_temporal_threshold, long int,
+ non_temporal_threshold, 0, (long int) -1);
+#endif
+}
@@ -23,6 +23,9 @@
#include <ifunc-init.h>
#include <isa.h>
+extern void __init_cacheinfo (void)
+ __attribute__ ((visibility ("hidden")));
+
#ifndef __x86_64__
/* Due to the reordering and the other nifty extensions in i686, it is
not really good to use heavily i586 optimized code on an i686. It's
@@ -55,7 +55,13 @@
#include <sysdep.h>
-ENTRY (_start)
+#ifdef LIBC_MAIN
+# define START __libc_main
+#else
+# define START _start
+#endif
+
+ENTRY (START)
/* Clearing frame pointer is insufficient, use CFI. */
cfi_undefined (rip)
/* Clear the frame pointer. The ABI suggests this be done, to mark
@@ -76,16 +82,24 @@ ENTRY (_start)
rtld_fini: %r9
stack_end: stack. */
+#ifdef LIBC_MAIN
+# define ARGC_REG RDI_LP
+# define ARGV_REG RSI_LP
+#else
+# define ARGC_REG RSI_LP
+# define ARGV_REG RDX_LP
+#endif
+
mov %RDX_LP, %R9_LP /* Address of the shared library termination
function. */
#ifdef __ILP32__
- mov (%rsp), %esi /* Simulate popping 4-byte argument count. */
+ mov (%rsp), %ARGC_REG /* Simulate popping 4-byte argument count. */
add $4, %esp
#else
- popq %rsi /* Pop the argument count. */
+ popq %ARGC_REG /* Pop the argument count. */
#endif
/* argv starts just at the current stack top. */
- mov %RSP_LP, %RDX_LP
+ mov %RSP_LP, %ARGV_REG
/* Align the stack to a 16 byte boundary to follow the ABI. */
and $~15, %RSP_LP
@@ -96,19 +110,22 @@ ENTRY (_start)
which grow downwards). */
pushq %rsp
-#ifdef PIC
+#ifdef LIBC_MAIN
+ call LIBC_MAIN
+#else
+# ifdef PIC
/* Pass address of our own entry points to .fini and .init. */
mov __libc_csu_fini@GOTPCREL(%rip), %R8_LP
mov __libc_csu_init@GOTPCREL(%rip), %RCX_LP
mov main@GOTPCREL(%rip), %RDI_LP
-#else
+# else
/* Pass address of our own entry points to .fini and .init. */
mov $__libc_csu_fini, %R8_LP
mov $__libc_csu_init, %RCX_LP
mov $main, %RDI_LP
-#endif
+# endif
/* Call the user's main function, and exit with its value.
But let the libc call main. Since __libc_start_main in
@@ -118,10 +135,12 @@ ENTRY (_start)
2.26 or above can convert indirect branch into direct
branch. */
call *__libc_start_main@GOTPCREL(%rip)
+#endif
hlt /* Crash if somehow `exit' does return. */
-END (_start)
+END (START)
+#ifndef LIBC_MAIN
/* Define a symbol for the first piece of initialized data. */
.data
.globl __data_start
@@ -129,3 +148,4 @@ __data_start:
.long 0
.weak data_start
data_start = __data_start
+#endif
--
2.26.2