You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
63 lines
3.1 KiB
63 lines
3.1 KiB
#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_ */
|
|
|