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Massage PPC version of cpu_get_real_ticks a little

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6435 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
malc 2009-01-25 10:56:48 +00:00
parent 004c9ef410
commit 5e10fc904e
1 changed files with 22 additions and 22 deletions
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44
cpu-all.h
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@ -996,30 +996,30 @@ void qemu_unregister_coalesced_mmio(target_phys_addr_t addr, ram_addr_t size);
#if defined(_ARCH_PPC)
static inline uint32_t get_tbl(void)
{
uint32_t tbl;
asm volatile("mftb %0" : "=r" (tbl));
return tbl;
}
static inline uint32_t get_tbu(void)
{
uint32_t tbl;
asm volatile("mftbu %0" : "=r" (tbl));
return tbl;
}
static inline int64_t cpu_get_real_ticks(void)
{
uint32_t l, h, h1;
/* NOTE: we test if wrapping has occurred */
do {
h = get_tbu();
l = get_tbl();
h1 = get_tbu();
} while (h != h1);
return ((int64_t)h << 32) | l;
int64_t retval;
#ifdef _ARCH_PPC64
/* This reads timebase in one 64bit go and includes Cell workaround from:
http://ozlabs.org/pipermail/linuxppc-dev/2006-October/027052.html
*/
__asm__ __volatile__ (
"mftb %0\n\t"
"cmpwi %0,0\n\t"
"beq- $-8"
: "=r" (retval));
#else
/* http://ozlabs.org/pipermail/linuxppc-dev/1999-October/003889.html */
unsigned long junk;
__asm__ __volatile__ (
"mftbu %1\n\t"
"mftb %L0\n\t"
"mftbu %0\n\t"
"cmpw %0,%1\n\t"
"bne $-16"
: "=r" (retval), "=r" (junk));
#endif
return retval;
}
#elif defined(__i386__)