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riscv: Add ifunc helper method to hwprobe.h

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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>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Evan Green 2024-02-27 14:56:42 -08:00 committed by Palmer Dabbelt
parent a29bb320a1
commit a2b47f7d46
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1 changed files with 29 additions and 0 deletions
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29
sysdeps/unix/sysv/linux/riscv/sys/hwprobe.h
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@ -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>
@ -79,6 +80,34 @@ typedef int (*__riscv_hwprobe_t) (struct riscv_hwprobe *__pairs, size_t __pair_c
__fortified_attr_access (__read_write__, 1, 2)
__fortified_attr_access (__read_only__, 4, 3);
/* Helper function usable from ifunc selectors that probes a single key. */
static __inline int
__riscv_hwprobe_one(__riscv_hwprobe_t hwprobe_func,
long long int key,
unsigned long long int *value)
{
struct riscv_hwprobe pair;
int rc;
/* Earlier versions of glibc pass NULL as the second ifunc parameter. Other C
libraries on non-Linux systems may pass +1 as this function pointer to
indicate no support. Users copying this function to exotic worlds
(non-Linux non-glibc) may want to do additional validity checks here. */
if (hwprobe_func == NULL)
return ENOSYS;
pair.key = key;
rc = hwprobe_func (&pair, 1, 0, NULL, 0);
if (rc != 0)
return rc;
if (pair.key < 0)
return ENOENT;
*value = pair.value;
return 0;
}
__END_DECLS
#endif /* sys/hwprobe.h */