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Kernel: PageTable::create_userspace() now works

This commit is contained in:
Bananymous 2023-05-31 00:35:30 +03:00
parent 9a416e8ae8
commit 9f499991c8
1 changed files with 8 additions and 10 deletions
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18
kernel/arch/x86_64/PageTable.cpp
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@ -9,7 +9,7 @@
for (uint64_t i = 0; i < 512; i++) \
if ((s)[i] & Flags::Present) \
return; \
kfree((void*)P2V(s)); \
kfree(s); \
} while (false)
extern uint8_t g_kernel_start[];
@ -86,8 +86,6 @@ namespace Kernel
// Here we copy the s_kernel paging structs since they are
// global for every process
ASSERT_NOT_REACHED();
LockGuard _(s_kernel->m_lock);
uint64_t* global_pml4 = (uint64_t*)P2V(s_kernel->m_highest_paging_struct);
@ -98,30 +96,30 @@ namespace Kernel
if (!(global_pml4[pml4e] & Flags::Present))
continue;
uint64_t* global_pdpt = (uint64_t*)(global_pml4[pml4e] & PAGE_ADDR_MASK);
uint64_t* global_pdpt = (uint64_t*)P2V(global_pml4[pml4e] & PAGE_ADDR_MASK);
uint64_t* pdpt = allocate_page_aligned_page();
pml4[pml4e] = (uint64_t)pdpt | (global_pml4[pml4e] & PAGE_FLAG_MASK);
pml4[pml4e] = V2P(pdpt) | (global_pml4[pml4e] & PAGE_FLAG_MASK);
for (uint32_t pdpte = 0; pdpte < 512; pdpte++)
{
if (!(global_pdpt[pdpte] & Flags::Present))
continue;
uint64_t* global_pd = (uint64_t*)(global_pdpt[pdpte] & PAGE_ADDR_MASK);
uint64_t* global_pd = (uint64_t*)P2V(global_pdpt[pdpte] & PAGE_ADDR_MASK);
uint64_t* pd = allocate_page_aligned_page();
pdpt[pdpte] = (uint64_t)pd | (global_pdpt[pdpte] & PAGE_FLAG_MASK);
pdpt[pdpte] = V2P(pd) | (global_pdpt[pdpte] & PAGE_FLAG_MASK);
for (uint32_t pde = 0; pde < 512; pde++)
{
if (!(global_pd[pde] & Flags::Present))
continue;
uint64_t* global_pt = (uint64_t*)(global_pd[pde] & PAGE_ADDR_MASK);
uint64_t* global_pt = (uint64_t*)P2V(global_pd[pde] & PAGE_ADDR_MASK);
uint64_t* pt = allocate_page_aligned_page();
pd[pde] = (uint64_t)pt | (global_pd[pde] & PAGE_FLAG_MASK);
pd[pde] = V2P(pt) | (global_pd[pde] & PAGE_FLAG_MASK);
memcpy(pt, global_pt, PAGE_SIZE);
}
@ -131,7 +129,7 @@ namespace Kernel
PageTable* result = new PageTable;
if (result == nullptr)
return BAN::Error::from_errno(ENOMEM);
result->m_highest_paging_struct = (paddr_t)pml4;
result->m_highest_paging_struct = V2P(pml4);
return result;
}