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Add method for reading the CR2 register value

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This will allow us to figure out the virtual address that caused a page-
or general protection fault.
This commit is contained in:
Achilleas Anagnostopoulos 2017-06-21 18:18:29 +01:00
parent 9adde8f5c1
commit c5aa5fe05f
2 changed files with 7 additions and 0 deletions
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3
kernel/cpu/cpu_amd64.go
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@ -18,3 +18,6 @@ func SwitchPDT(pdtPhysAddr uintptr)
// ActivePDT returns the physical address of the currently active page table.
func ActivePDT() uintptr
// ReadCR2 returns the value stored in the CR2 register.
func ReadCR2() uint64

4
kernel/cpu/cpu_amd64.s
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@ -27,3 +27,7 @@ TEXT ·ActivePDT(SB),NOSPLIT,$0
MOVQ AX, ret+0(FP)
RET
TEXT ·ReadCR2(SB),NOSPLIT,$0
MOVQ CR2, AX
MOVQ AX, ret+0(FP)
RET