Bananymous
/
banan-os
1
1
Fork 1
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Kernel: only map kernel from g_kernel_start onwards

This commit is contained in:
Bananymous 2023-10-30 15:33:18 +02:00
parent 0405461742
commit 26c7aee327
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
kernel/arch/x86_64/PageTable.cpp
View File

@ -143,8 +143,14 @@ namespace Kernel
uint64_t* pml4 = (uint64_t*)P2V(m_highest_paging_struct);
pml4[511] = s_global_pml4e;
// Map (0 -> phys_kernel_end) to (KERNEL_OFFSET -> virt_kernel_end)
map_range_at(0, KERNEL_OFFSET, (uintptr_t)g_kernel_end - KERNEL_OFFSET, Flags::ReadWrite | Flags::Present);
// Map (phys_kernel_start -> phys_kernel_end) to (virt_kernel_start -> virt_kernel_end)
ASSERT((vaddr_t)g_kernel_start % PAGE_SIZE == 0);
map_range_at(
V2P(g_kernel_start),
(vaddr_t)g_kernel_start,
g_kernel_end - g_kernel_start,
Flags::ReadWrite | Flags::Present
);
// Map executable kernel memory as executable
map_range_at(
@ -437,6 +443,8 @@ namespace Kernel
vaddr_t PageTable::reserve_free_page(vaddr_t first_address, vaddr_t last_address)
{
if (first_address >= KERNEL_OFFSET && first_address < (vaddr_t)g_kernel_end)
first_address = (vaddr_t)g_kernel_end;
if (size_t rem = first_address % PAGE_SIZE)
first_address += PAGE_SIZE - rem;
if (size_t rem = last_address % PAGE_SIZE)