AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/arch/parisc/include/asm/delay.h

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parisc: make udelay() SMP-safe Each CPU has it's own Control Register 16 (CR16) which is used as time source for the udelay() function. But since the CR16 registers across different CPUs are not synced, we need to recalculate the loop count if we get switched away to ensure that we really delay as much time as requested. Signed-off-by: Helge Deller <deller@gmx.de>
2013-10-24 04:29:16 +07:00
#ifndef _ASM_PARISC_DELAY_H
#define _ASM_PARISC_DELAY_H
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 05:20:36 +07:00
static __inline__ void __delay(unsigned long loops) {
asm volatile(
" .balignl 64,0x34000034\n"
" addib,UV -1,%0,.\n"
" nop\n"
: "=r" (loops) : "0" (loops));
}
parisc: make udelay() SMP-safe Each CPU has it's own Control Register 16 (CR16) which is used as time source for the udelay() function. But since the CR16 registers across different CPUs are not synced, we need to recalculate the loop count if we get switched away to ensure that we really delay as much time as requested. Signed-off-by: Helge Deller <deller@gmx.de>
2013-10-24 04:29:16 +07:00
extern void __udelay(unsigned long usecs);
extern void __udelay_bad(unsigned long usecs);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 05:20:36 +07:00
parisc: make udelay() SMP-safe Each CPU has it's own Control Register 16 (CR16) which is used as time source for the udelay() function. But since the CR16 registers across different CPUs are not synced, we need to recalculate the loop count if we get switched away to ensure that we really delay as much time as requested. Signed-off-by: Helge Deller <deller@gmx.de>
2013-10-24 04:29:16 +07:00
static inline void udelay(unsigned long usecs)
{
if (__builtin_constant_p(usecs) && (usecs) > 20000)
__udelay_bad(usecs);
__udelay(usecs);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 05:20:36 +07:00
}
parisc: make udelay() SMP-safe Each CPU has it's own Control Register 16 (CR16) which is used as time source for the udelay() function. But since the CR16 registers across different CPUs are not synced, we need to recalculate the loop count if we get switched away to ensure that we really delay as much time as requested. Signed-off-by: Helge Deller <deller@gmx.de>
2013-10-24 04:29:16 +07:00
#endif /* _ASM_PARISC_DELAY_H */
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