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bootloader/bios_ia32: Add an assertion and clean up rounding in MMU code.

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No functional change intended.
This commit is contained in:
Augustin Cavalier 2024-10-14 15:04:06 -04:00
parent 8251b2c8f6
commit 16e96d6e04
1 changed files with 7 additions and 3 deletions
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10
src/system/boot/platform/bios_ia32/mmu.cpp
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@ -114,6 +114,9 @@ allocate_virtual(size_t size)
static addr_t
allocate_physical(size_t size, bool forKernel)
{
if ((size % B_PAGE_SIZE) != 0)
panic("request for non-page-aligned physical memory!");
uint64 base;
if (!forKernel) {
base = sNextPhysicalAddress;
@ -406,7 +409,7 @@ mmu_allocate(void *virtualAddress, size_t size)
TRACE("mmu_allocate: requested vaddr: %p, next free vaddr: 0x%lx, size: "
"%ld\n", virtualAddress, sNextVirtualAddress, size);
size = (size + B_PAGE_SIZE - 1) / B_PAGE_SIZE;
size = HOWMANY(size, B_PAGE_SIZE);
// get number of pages to map
if (virtualAddress != NULL) {
@ -419,7 +422,7 @@ mmu_allocate(void *virtualAddress, size_t size)
// is the address within the valid range?
if (address < KERNEL_LOAD_BASE || address + size * B_PAGE_SIZE
>= KERNEL_LOAD_BASE + kMaxKernelSize)
>= KERNEL_LOAD_BASE + kMaxKernelSize)
return NULL;
for (uint32 i = 0; i < size; i++) {
@ -497,7 +500,8 @@ mmu_free(void *virtualAddress, size_t size)
addr_t address = (addr_t)virtualAddress;
addr_t pageOffset = address % B_PAGE_SIZE;
address -= pageOffset;
size = (size + pageOffset + B_PAGE_SIZE - 1) / B_PAGE_SIZE * B_PAGE_SIZE;
size += pageOffset;
size = ROUNDUP(size, B_PAGE_SIZE);
// is the address within the valid range?
if (address < KERNEL_LOAD_BASE || address + size > sNextVirtualAddress) {