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Internal many paging_util functions.

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This commit is contained in:
Drew Galbraith 2023-05-18 11:40:13 -07:00
parent fa2bb4df89
commit de2c96b848
2 changed files with 33 additions and 44 deletions
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66
zion/memory/paging_util.cpp
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@ -41,6 +41,39 @@ uint64_t ShiftForEntryIndexing(uint64_t addr, uint64_t offset) {
return addr;
}
uint64_t* Pml4Entry(uint64_t addr) {
return reinterpret_cast<uint64_t*>(PML_RECURSE |
ShiftForEntryIndexing(addr, PML_OFFSET));
}
uint64_t* PageDirectoryPointerEntry(uint64_t addr) {
return reinterpret_cast<uint64_t*>(PDP_RECURSE |
ShiftForEntryIndexing(addr, PDP_OFFSET));
}
uint64_t* PageDirectoryEntry(uint64_t addr) {
return reinterpret_cast<uint64_t*>(PD_RECURSE |
ShiftForEntryIndexing(addr, PD_OFFSET));
}
uint64_t* PageTableEntry(uint64_t addr) {
return reinterpret_cast<uint64_t*>(PT_RECURSE |
ShiftForEntryIndexing(addr, PT_OFFSET));
}
bool PageDirectoryPointerLoaded(uint64_t addr) {
return *Pml4Entry(addr) & PRESENT_BIT;
}
bool PageDirectoryLoaded(uint64_t addr) {
return PageDirectoryPointerLoaded(addr) &&
(*PageDirectoryPointerEntry(addr) & PRESENT_BIT);
}
bool PageTableLoaded(uint64_t addr) {
return PageDirectoryLoaded(addr) && (*PageDirectoryEntry(addr) & PRESENT_BIT);
}
void MapPage(uint64_t virt, uint64_t phys) {
if (PageLoaded(virt)) {
panic("Allocating Over Existing Page: %m", virt);
@ -97,39 +130,6 @@ void EnsureResident(uint64_t addr, uint64_t size) {
}
}
uint64_t* Pml4Entry(uint64_t addr) {
return reinterpret_cast<uint64_t*>(PML_RECURSE |
ShiftForEntryIndexing(addr, PML_OFFSET));
}
uint64_t* PageDirectoryPointerEntry(uint64_t addr) {
return reinterpret_cast<uint64_t*>(PDP_RECURSE |
ShiftForEntryIndexing(addr, PDP_OFFSET));
}
uint64_t* PageDirectoryEntry(uint64_t addr) {
return reinterpret_cast<uint64_t*>(PD_RECURSE |
ShiftForEntryIndexing(addr, PD_OFFSET));
}
uint64_t* PageTableEntry(uint64_t addr) {
return reinterpret_cast<uint64_t*>(PT_RECURSE |
ShiftForEntryIndexing(addr, PT_OFFSET));
}
bool PageDirectoryPointerLoaded(uint64_t addr) {
return *Pml4Entry(addr) & PRESENT_BIT;
}
bool PageDirectoryLoaded(uint64_t addr) {
return PageDirectoryPointerLoaded(addr) &&
(*PageDirectoryPointerEntry(addr) & PRESENT_BIT);
}
bool PageTableLoaded(uint64_t addr) {
return PageDirectoryLoaded(addr) && (*PageDirectoryEntry(addr) & PRESENT_BIT);
}
bool PageLoaded(uint64_t addr) {
return PageTableLoaded(addr) && (*PageTableEntry(addr) & PRESENT_BIT);
}