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VMM - get_page works for different address

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This commit is contained in:
Thomas Lovén 2017-12-24 01:50:13 +01:00
parent 1ad156902a
commit d32e93b72b
2 changed files with 23 additions and 11 deletions
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20
src/kernel/memory/vmm.c
View File

@ -10,22 +10,20 @@ union PTE {
};
};
typedef union PTE PT[512];
#define PT(ptr) ((PT *)MASK_FLAGS(ptr->value))
#define P4e(pt, addr) (((PT *)pt)[P4_OFFSET(addr)])
#define P3e(pt, addr) PT(P4e(pt, addr))[P3_OFFSET(addr)]
#define P2e(pt, addr) PT(P3e(pt, addr))[P2_OFFSET(addr)]
#define P1e(pt, addr) PT(P2e(pt, addr))[P1_OFFSET(addr)]
#define PT(ptr) ((union PTE *)MASK_FLAGS(ptr))
#define P4e(pt, addr) (PT(pt)[P4_OFFSET(addr)])
#define P3e(pt, addr) PT(P4e(pt, addr).value)[P3_OFFSET(addr)]
#define P2e(pt, addr) PT(P3e(pt, addr).value)[P2_OFFSET(addr)]
#define P1e(pt, addr) PT(P2e(pt, addr).value)[P1_OFFSET(addr)]
uintptr_t vmm_get_page(void *P4, uintptr_t addr)
{
if(P4
&& P4e(P4, addr)
&& P3e(P4, addr)
&& P2e(P4, addr)
&& P4e(P4, addr).value
&& P3e(P4, addr).value
&& P2e(P4, addr).value
)
return MASK_FLAGS(P1e(P4, addr)->value);
return MASK_FLAGS(P1e(P4, addr).value);
else
return 0;
}

14
src/kernel/memory/vmm.tt
View File

@ -44,3 +44,17 @@ TEST(get_page_ignores_flags)
ASSERT_EQ_PTR(ret, 0x1234567890ABC000);
}
TEST(get_page_works_for_different_address)
{
p4[1] = (uintptr_t)p3;
p4[1] |= 0x123;
p3[2] = (uintptr_t)p2;
p3[2] |= 0x456;
p2[3] = (uintptr_t)p1;
p2[3] |= 0x789;
p1[4] = 0x34567890ABCDEF12;
uintptr_t ret = vmm_get_page(p4, (1UL<<39)+(2UL<<30)+(3UL<<21)+(4UL<<12));
ASSERT_EQ_PTR(ret, 0x34567890ABCDE000);
}