8c2bece89f
- initial implementation of _read_host_time_ns, a function to retrieve real-time in ns in vmware virtual machines
50 lines
1.0 KiB
ArmAsm
50 lines
1.0 KiB
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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!*===========================================================================*
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! PUBLIC void read_host_time_ns(unsigned long *high, unsigned long *low);
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! access real time in ns from host in vmware.
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.align 16
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_read_host_time_ns:
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push edx
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push eax
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push ecx
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mov ecx, 0x10001
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.data1 0x0f ! this is the RDPMC instruction
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.data1 0x33 ! it places the result in EDX:EAX
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push ebp
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mov ebp, 20(esp)
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mov (ebp), edx
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mov ebp, 24(esp)
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mov (ebp), eax
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pop ebp
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pop ecx
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pop eax
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pop edx
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ret
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