diff options
| -rw-r--r-- | cpu-all.h | 44 |
1 files changed, 22 insertions, 22 deletions
@@ -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__) |