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Add a WIP VMM

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As of now the VMM (pretty much a doubly linked list of regions) supports allocating and demand paging. still no deallocation though so if you allocate something you can't free it yet :')
This commit is contained in:
Matheus
2022-07-27 00:39:55 -03:00
parent 4ea2880817
commit f1d3126990
11 changed files with 564 additions and 21 deletions
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src/arch/x86_64/mmu.c
+10 -8
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@@ -44,6 +44,7 @@ static bool setpage(arch_mmu_tableptr context, void* vaddr, uint64_t entry){
// TODO unallocate in case of failure
if(!pdptaddr){
pdptaddr = pmm_alloc(1);
changeentry(&context[pdpt], pdptaddr, PTR_FLAGS);
@@ -53,7 +54,7 @@ static bool setpage(arch_mmu_tableptr context, void* vaddr, uint64_t entry){
pdptaddr = (void*)pdptaddr + (size_t)limine_hhdm_offset;
uint64_t* pdaddr = pdptaddr[pd] & ~0xFFF;
if(!pdaddr){
pdaddr = pmm_alloc(1);
changeentry(&pdptaddr[pd], pdaddr, PTR_FLAGS);
@@ -64,8 +65,6 @@ static bool setpage(arch_mmu_tableptr context, void* vaddr, uint64_t entry){
uint64_t* ptaddr = pdaddr[pt]& ~0xFFF;
if(!ptaddr){
ptaddr = pmm_alloc(1);
changeentry(&pdaddr[pt], ptaddr, PTR_FLAGS);
@@ -87,7 +86,8 @@ int arch_mmu_map(arch_mmu_tableptr context, void* paddr, void* vaddr, size_t fla
changeentry(&entry, paddr, flags);
int ret = setpage(context, vaddr, entry);
if(ret) invalidate(vaddr);
return ret;
@@ -128,13 +128,13 @@ void arch_mmu_init(){
for(size_t entry = 0; entry < count; ++entry){
void* addr = entries[entry]->base;
for(size_t offset = 0; offset < entries[entry]->length; offset += PAGE_SIZE){
for(size_t pageoffset = 0; pageoffset < entries[entry]->length / PAGE_SIZE; ++pageoffset){
uint64_t entry;
changeentry(&entry, addr + offset, ARCH_MMU_MAP_READ | ARCH_MMU_MAP_WRITE);
changeentry(&entry, addr + pageoffset*PAGE_SIZE, ARCH_MMU_MAP_READ | ARCH_MMU_MAP_WRITE);
setpage(context, addr + offset, entry);
setpage(context, addr + offset + (size_t)limine_hhdm_offset, entry);
setpage(context, addr + pageoffset*PAGE_SIZE, entry);
setpage(context, addr + pageoffset*PAGE_SIZE + (size_t)limine_hhdm_offset, entry);
}
@@ -190,6 +190,8 @@ void arch_mmu_init(){
switchcontext(context);
arch_getcls()->context->context = context;
printf("In bootstrap context\n");
}