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VMM - get_page fails if PTE not present

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This commit is contained in:
Thomas Lovén
2017-12-24 01:59:35 +01:00
parent d32e93b72b
commit 57482136ae
2 changed files with 41 additions and 14 deletions
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20
src/kernel/memory/vmm.c
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@@ -6,7 +6,16 @@
union PTE {
uint64_t value;
struct {
uintptr_t flags:12;
uintptr_t present:1;
uintptr_t write:1;
uintptr_t user:1;
uintptr_t write_through:1;
uintptr_t nocache:1;
uintptr_t accessed:1;
uintptr_t dirty:1;
uintptr_t huge:1;
uintptr_t global:1;
uintptr_t flags:3;
};
};
@@ -19,11 +28,12 @@ union PTE {
uintptr_t vmm_get_page(void *P4, uintptr_t addr)
{
if(P4
&& P4e(P4, addr).value
&& P3e(P4, addr).value
&& P2e(P4, addr).value
&& P4e(P4, addr).present
&& P3e(P4, addr).present
&& P2e(P4, addr).present
&& P1e(P4, addr).present
)
return MASK_FLAGS(P1e(P4, addr).value);
else
return 0;
return -1;
}