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(PPC_Get_timebase_register, PPC_Set_timebase_register): New.

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This commit is contained in:
Ralf Corsepius
2005-02-15 15:10:52 +00:00
parent 81f88fe8a1
commit 58847845eb
1 changed files with 37 additions and 0 deletions
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37
cpukit/score/cpu/powerpc/rtems/score/cpu.h
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@@ -160,5 +160,42 @@ static inline uint32_t CPU_swap_u32(
#endif /* ASM */
#ifndef ASM
/*
* Routines to access the time base register
*/
static inline uint64_t PPC_Get_timebase_register( void )
{
uint32_t tbr_low;
uint32_t tbr_high;
uint32_t tbr_high_old;
uint64_t tbr;
do {
asm volatile( "mftbu %0" : "=r" (tbr_high_old));
asm volatile( "mftb %0" : "=r" (tbr_low));
asm volatile( "mftbu %0" : "=r" (tbr_high));
} while ( tbr_high_old != tbr_high );
tbr = tbr_high;
tbr <<= 32;
tbr |= tbr_low;
return tbr;
}
static inline void PPC_Set_timebase_register (uint64_t tbr)
{
uint32_t tbr_low;
uint32_t tbr_high;
tbr_low = (tbr & 0xffffffff) ;
tbr_high = (tbr >> 32) & 0xffffffff;
asm volatile( "mtspr 284, %0" : : "r" (tbr_low));
asm volatile( "mtspr 285, %0" : : "r" (tbr_high));
}
#endif /* ASM */
#endif /* _RTEMS_SCORE_CPU_H */