64 lines
3.1 KiB
C
64 lines
3.1 KiB
C
#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_
|
|
#define COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_
|
|
#include "libc/bits/bits.h"
|
|
#if !(__ASSEMBLER__ + __LINKER__ + 0)
|
|
COSMOPOLITAN_C_START_
|
|
|
|
#define TSC_AUX_CORE(MSR) ((MSR)&0xfff)
|
|
#define TSC_AUX_NODE(MSR) (((MSR) >> 12) & 0xfff)
|
|
|
|
/**
|
|
* Reads CPU timestamp counter and IA32_TSC_AUX.
|
|
*
|
|
* This macro inhibits compiler magic.
|
|
* This macro does not inhibit CPU magic.
|
|
*
|
|
* @see X86_HAVE(RDTSCP)
|
|
*/
|
|
#define rdtscp(OPT_OUT_IA32_TSC_AUX) \
|
|
({ \
|
|
uint32_t Ecx, *EcxOut; \
|
|
uint64_t Rax, Rcx, Rdx; \
|
|
asm volatile("rdtscp" \
|
|
: "=a"(Rax), "=c"(Ecx), "=d"(Rdx) \
|
|
: /* no inputs */ \
|
|
: "memory"); \
|
|
EcxOut = (OPT_OUT_IA32_TSC_AUX); \
|
|
if (EcxOut) *EcxOut = Ecx; \
|
|
Rdx << 32 | Rax; \
|
|
})
|
|
|
|
/**
|
|
* Reads timestamp counter auxiliary model specific register value.
|
|
*/
|
|
#define rdpid() \
|
|
({ \
|
|
bool Ok; \
|
|
long Msr; \
|
|
Ok = false; \
|
|
if (X86_HAVE(RDPID)) { \
|
|
asm volatile("rdpid\t%0" : "=r"(Msr) : /* no inputs */ : "memory"); \
|
|
Ok = true; \
|
|
} else if (IsLinux()) { \
|
|
asm volatile(ZFLAG_ASM("lsl\t%2,%1") \
|
|
: ZFLAG_CONSTRAINT(Ok), "=r"(Msr) \
|
|
: "r"(0x7b) \
|
|
: "memory"); \
|
|
} \
|
|
if (!Ok && X86_HAVE(RDTSCP)) { \
|
|
asm volatile("rdtscp" \
|
|
: "=c"(Msr) \
|
|
: /* no inputs */ \
|
|
: "eax", "edx", "memory"); \
|
|
Ok = true; \
|
|
} \
|
|
if (!Ok) { \
|
|
Msr = -1; \
|
|
} \
|
|
Msr; \
|
|
})
|
|
|
|
COSMOPOLITAN_C_END_
|
|
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
|
|
#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_ */
|