[v8,5/6] riscv: Add ifunc helper method to hwprobe.h
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Commit Message
Add a little helper method so it's easier to fetch a single value from
the hwprobe function when used within an ifunc selector.
Signed-off-by: Evan Green <evan@rivosinc.com>
---
(no changes since v7)
Changes in v7:
- Introduced static inline helper (Richard)
sysdeps/unix/sysv/linux/riscv/sys/hwprobe.h | 24 +++++++++++++++++++++
1 file changed, 24 insertions(+)
@@ -22,6 +22,7 @@
#include <features.h>
#include <stddef.h>
+#include <errno.h>
#ifdef __has_include
# if __has_include (<asm/hwprobe.h>)
# include <asm/hwprobe.h>
@@ -79,4 +80,27 @@ typedef int (*__riscv_hwprobe_t) (struct riscv_hwprobe *__pairs, size_t __pair_c
__END_DECLS
+/* Helper function usable from ifunc selectors that probes a single key. */
+static inline int __riscv_hwprobe_one(__riscv_hwprobe_t hwprobe_func,
+ signed long long int key,
+ unsigned long long int *value)
+{
+ struct riscv_hwprobe pair;
+ int rc;
+
+ if (!hwprobe_func)
+ return ENOSYS;
+
+ pair.key = key;
+ rc = hwprobe_func(&pair, 1, 0, NULL, 0);
+ if (rc)
+ return rc;
+
+ if (pair.key < 0)
+ return ENOENT;
+
+ *value = pair.value;
+ return 0;
+}
+
#endif /* sys/hwprobe.h */