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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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53
libc/nexgen32e/rdtscp.h Normal file
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#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_
#define COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_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() \
({ \
long Msr; \
if (X86_HAVE(RDPID)) { \
asm volatile("rdpid\t%0" : "=r"(Msr) : /* no inputs */ : "memory"); \
} else if (IsLinux()) { \
asm volatile("lsl\t%1,%0" : "=r"(Msr) : "r"(0x7b) : "memory"); \
} else if (X86_HAVE(RDTSCP)) { \
asm volatile("rdtscp" \
: "=c"(Msr) \
: /* no inputs */ \
: "eax", "edx", "memory"); \
} else { \
Msr = -1; \
} \
Msr; \
})
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_ */