6d50591226
. read_tsc() in sysutil library saves edx and eax now . added read_tsc_64() by Antonio Mancina to load tsc into a 64-bit data type directly . deleted read_tsc.h in favour of a prototype in <minix/syslib.h>
28 lines
578 B
ArmAsm
28 lines
578 B
ArmAsm
#
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! sections
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.sect .text; .sect .rom; .sect .data; .sect .bss
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.define _read_tsc ! read the cycle counter (Pentium and up)
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.sect .text
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!*===========================================================================*
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! PUBLIC void read_tsc(unsigned long *high, unsigned long *low);
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! Read the cycle counter of the CPU. Pentium and up.
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.align 16
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_read_tsc:
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push edx
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push eax
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.data1 0x0f ! this is the RDTSC instruction
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.data1 0x31 ! it places the TSC in EDX:EAX
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push ebp
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mov ebp, 16(esp)
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mov (ebp), edx
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mov ebp, 20(esp)
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mov (ebp), eax
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pop ebp
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pop eax
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pop edx
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ret
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