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Kernel: Fix bitmap byte index calculation in PMM 

No idea how I had not crashed here earlier, but running on real hw with
a bit initrd ended up crashing :D
This commit is contained in:
Bananymous 2026-01-04 01:16:43 +02:00
parent 706c0816dd
commit 4b5a8196c3
1 changed files with 6 additions and 4 deletions
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10
kernel/kernel/Memory/PhysicalRange.cpp
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@ -98,8 +98,9 @@ namespace Kernel
[this](size_t buffer_bit) -> bool [this](size_t buffer_bit) -> bool
{ {
const size_t page_index = buffer_bit / bits_per_page; const size_t page_index = buffer_bit / bits_per_page;
const size_t byte = buffer_bit / 8; const size_t bit_index = buffer_bit % bits_per_page;
const size_t bit = buffer_bit % 8; const size_t byte = bit_index / 8;
const size_t bit = bit_index % 8;
uint8_t current; uint8_t current;
PageTable::with_fast_page(m_paddr + page_index * PAGE_SIZE, [&current, byte] { PageTable::with_fast_page(m_paddr + page_index * PAGE_SIZE, [&current, byte] {
@ -113,8 +114,9 @@ namespace Kernel
[this](size_t buffer_bit) -> void [this](size_t buffer_bit) -> void
{ {
const size_t page_index = buffer_bit / bits_per_page; const size_t page_index = buffer_bit / bits_per_page;
const size_t byte = buffer_bit / 8; const size_t bit_index = buffer_bit % bits_per_page;
const size_t bit = buffer_bit % 8; const size_t byte = bit_index / 8;
const size_t bit = bit_index % 8;
PageTable::with_fast_page(m_paddr + page_index * PAGE_SIZE, [byte, bit] { PageTable::with_fast_page(m_paddr + page_index * PAGE_SIZE, [byte, bit] {
volatile uint8_t& current = PageTable::fast_page_as_sized<volatile uint8_t>(byte); volatile uint8_t& current = PageTable::fast_page_as_sized<volatile uint8_t>(byte);
current = current | (1u << bit); current = current | (1u << bit);