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https://github.com/KolibriOS/kolibrios.git
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78 lines
1.2 KiB
ArmAsm
78 lines
1.2 KiB
ArmAsm
#include "asm_i386.h"
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.data
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fpenv: .long 0, 0, 0, 0, 0, 0, 0, 0
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.text
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.globl C(StartMSRInterval)
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C(StartMSRInterval):
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movl $0x11,%ecx // read the CESR
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.byte 0x0F
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.byte 0x32 // RDMSR
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andl $0xFE3FFE3F,%eax // stop both counters
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.byte 0x0F
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.byte 0x30 // WRMSR
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movl 4(%esp),%eax // point counter 0 to desired event, with counters
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andl $0x3F,%eax // still stopped
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movl $0x11,%ecx
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.byte 0x0F
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.byte 0x30 // WRMSR
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movl $0x12,%ecx // set counter 0 to the value 0
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subl %eax,%eax
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subl %edx,%edx
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.byte 0x0F
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.byte 0x30 // WRMSR
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movl 4(%esp),%eax // restart counter 0 with selected event
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andl $0x3F,%eax
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subl %edx,%edx
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orl $0xC0,%eax
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movl $0x11,%ecx // control and event select
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.byte 0x0F
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.byte 0x30 // WRMSR
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ret
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.globl C(EndMSRInterval)
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C(EndMSRInterval):
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movl $0x12,%ecx // counter 0
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.byte 0x0F
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.byte 0x32 // RDMSR
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ret // lower 32 bits of count in %eax
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#if 0
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.data
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Lxxx: .long 0
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.text
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.globl C(setstackcheck)
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C(setstackcheck):
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movl %esp,%eax
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subl $0x38000,%eax
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movl $0x5A5A5A5A,(%eax)
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movl %eax,Lxxx
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ret
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.globl C(dostackcheck)
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C(dostackcheck):
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movl Lxxx,%edx
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movl $0,%eax
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cmpl $0x5A5A5A5A,(%edx)
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jz qqq
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incl %eax
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qqq:
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ret
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#endif
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