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64 lines
3.1 KiB
C
64 lines
3.1 KiB
C
#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_
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#define COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_
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#include "libc/bits/bits.h"
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#include "libc/nexgen32e/x86feature.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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#define TSC_AUX_CORE(MSR) ((MSR)&0xfff)
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#define TSC_AUX_NODE(MSR) (((MSR) >> 12) & 0xfff)
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/**
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* Reads CPU timestamp counter and IA32_TSC_AUX.
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*
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* This macro inhibits compiler magic.
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* This macro does not inhibit CPU magic.
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*
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* @see X86_HAVE(RDTSCP)
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*/
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#define rdtscp(OPT_OUT_IA32_TSC_AUX) \
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({ \
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uint32_t Ecx, *EcxOut; \
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uint64_t Rax, Rcx, Rdx; \
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asm volatile("rdtscp" \
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: "=a"(Rax), "=c"(Ecx), "=d"(Rdx) \
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: /* no inputs */ \
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: "memory"); \
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EcxOut = (OPT_OUT_IA32_TSC_AUX); \
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if (EcxOut) *EcxOut = Ecx; \
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Rdx << 32 | Rax; \
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})
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/**
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* Reads timestamp counter auxiliary model specific register value.
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*/
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#define rdpid() \
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({ \
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bool Ok; \
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long Msr; \
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Ok = false; \
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if (X86_HAVE(RDPID)) { \
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asm volatile("rdpid\t%0" : "=r"(Msr) : /* no inputs */ : "memory"); \
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Ok = true; \
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} else if (IsLinux()) { \
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asm volatile(ZFLAG_ASM("lsl\t%2,%1") \
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: ZFLAG_CONSTRAINT(Ok), "=r"(Msr) \
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: "r"(0x7b) \
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: "memory"); \
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} \
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if (!Ok && X86_HAVE(RDTSCP)) { \
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asm volatile("rdtscp" \
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: "=c"(Msr) \
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: /* no inputs */ \
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: "eax", "edx", "memory"); \
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Ok = true; \
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} \
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if (!Ok) { \
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Msr = -1; \
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} \
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Msr; \
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})
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_ */
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