riscv: Add hwprobe vdso call support

The new riscv_hwprobe syscall also comes with a vDSO for faster answers
to your most common questions. Call in today to speak with a kernel
representative near you!

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 14:56:39 -08:00 committed by Palmer Dabbelt
parent c6c33339b4
commit e7919e0db2
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
4 changed files with 16 additions and 2 deletions

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@ -71,6 +71,16 @@ PROCINFO_CLASS int (*_dl_vdso_clock_getres_time64) (clockid_t,
# ifdef HAVE_GET_TBFREQ
PROCINFO_CLASS uint64_t (*_dl_vdso_get_tbfreq)(void) RELRO;
# endif
/* RISC-V specific ones. */
# ifdef HAVE_RISCV_HWPROBE
PROCINFO_CLASS int (*_dl_vdso_riscv_hwprobe)(void *,
size_t,
size_t,
unsigned long *,
unsigned int) RELRO;
# endif
#endif
#undef RELRO

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@ -47,6 +47,9 @@ setup_vdso_pointers (void)
#ifdef HAVE_GET_TBFREQ
GLRO(dl_vdso_get_tbfreq) = dl_vdso_vsym (HAVE_GET_TBFREQ);
#endif
#ifdef HAVE_RISCV_HWPROBE
GLRO(dl_vdso_riscv_hwprobe) = dl_vdso_vsym (HAVE_RISCV_HWPROBE);
#endif
}
#endif

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@ -28,8 +28,8 @@ int __riscv_hwprobe (struct riscv_hwprobe *pairs, size_t pair_count,
{
int r;
r = INTERNAL_SYSCALL_CALL (riscv_hwprobe, pairs, pair_count,
cpu_count, cpus, flags);
r = INTERNAL_VSYSCALL (riscv_hwprobe, 5, pairs, pair_count,
cpu_count, cpus, flags);
/* Negate negative errno values to match pthreads API. */
return -r;

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@ -156,6 +156,7 @@
/* List of system calls which are supported as vsyscalls (for RV32 and
RV64). */
# define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
# define HAVE_RISCV_HWPROBE "__vdso_riscv_hwprobe"
# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1