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libroot/musl: Import ppc atomic_arch.h.

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Change-Id: I51b460b6a126cf401679ae2fd398445bd9969761
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6910
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
This commit is contained in:
David Karoly 2023-09-17 19:15:18 +02:00 committed by Fredrik Holmqvist
parent dc3b3e172d
commit f76f6d8f57
1 changed files with 38 additions and 0 deletions
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38
src/system/libroot/posix/musl/arch/ppc/atomic_arch.h Normal file
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#define a_ll a_ll
static inline int a_ll(volatile int *p)
{
int v;
__asm__ __volatile__ ("lwarx %0, 0, %2" : "=r"(v) : "m"(*p), "r"(p));
return v;
}
#define a_sc a_sc
static inline int a_sc(volatile int *p, int v)
{
int r;
__asm__ __volatile__ (
"stwcx. %2, 0, %3 ; mfcr %0"
: "=r"(r), "=m"(*p) : "r"(v), "r"(p) : "memory", "cc");
return r & 0x20000000; /* "bit 2" of "cr0" (backwards bit order) */
}
#define a_barrier a_barrier
static inline void a_barrier()
{
__asm__ __volatile__ ("sync" : : : "memory");
}
#define a_pre_llsc a_barrier
#define a_post_llsc a_post_llsc
static inline void a_post_llsc()
{
__asm__ __volatile__ ("isync" : : : "memory");
}
#define a_clz_32 a_clz_32
static inline int a_clz_32(uint32_t x)
{
__asm__ ("cntlzw %0, %1" : "=r"(x) : "r"(x));
return x;
}