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https://github.com/jart/cosmopolitan.git
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2ab9e9f7fd
- Introduce portable sched_getcpu() api - Support GCC's __target_clones__ feature - Make fma() go faster on x86 in default mode - Remove some asan checks from core libraries - WinMain() now ensures $HOME and $USER are defined
65 lines
3.1 KiB
C
65 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/dce.h"
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#include "libc/intrin/asmflag.h"
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#include "libc/nexgen32e/x86feature.h"
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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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uint64_t Rax, Rdx; \
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uint32_t Ecx, *EcxOut; \
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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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long Msr; \
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bool32 Ok; \
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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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char *p = (char *)0x7b; \
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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"(p) \
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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 /* COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_ */
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