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elks-enhanced

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Owner: themasterBranch: masterCommits: 6893Updated: 2026-04-19 00:15

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elks-enhanced / libc / debug / rdtsc.S

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/* ia16-elf-gcc ASM instrumentation functions for ELKS */
/* June 2022 Greg Haerr */

        .code16
        .text

        .global _get_rdtsc
// unsigned long long _get_rdtsc(void)
// 386+ only, reads CPU time stamp counter
_get_rdtsc:
        mov  %sp,%bx
        mov  2(%bx),%bx // get address for 64-bit return
        rdtsc           // returns 64-bit EDX:EAX
        mov  %ax,(%bx)
        shr  $16,%eax
        mov  %ax,2(%bx)
        mov  %dx,4(%bx)
        shr  $16,%edx
        mov  %dx,6(%bx)
        ret

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