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Kernel: Invalid physical addresses from heap are specified now by 0

This commit is contained in:
Bananymous 2023-05-06 01:03:04 +03:00
parent ab8aac7dcf
commit 9c07add00f
3 changed files with 5 additions and 8 deletions
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3
kernel/include/kernel/Memory/Heap.h
View File

@ -15,9 +15,6 @@ namespace Kernel
class PhysicalRange
{
public:
static constexpr paddr_t invalid = ~paddr_t(0);
public:
PhysicalRange(paddr_t, size_t);
paddr_t reserve_page();

4
kernel/kernel/Memory/Heap.cpp
View File

@ -55,7 +55,7 @@ namespace Kernel
paddr_t PhysicalRange::reserve_page()
{
if (m_free_list == nullptr)
return invalid;
return 0;
node* page = m_free_list;
ASSERT(page->next == nullptr);
@ -161,7 +161,7 @@ namespace Kernel
paddr_t Heap::take_free_page()
{
for (auto& range : m_physical_ranges)
if (paddr_t page = range.reserve_page(); page != PhysicalRange::invalid)
if (paddr_t page = range.reserve_page())
return page;
ASSERT_NOT_REACHED();
}

6
kernel/kernel/Process.cpp
View File

@ -75,14 +75,14 @@ namespace Kernel
uint8_t flags = MMU::Flags::UserSupervisor | MMU::Flags::Present;
if (elf_program_header.p_flags & LibELF::PF_W)
flags |= MMU::Flags::ReadWrite;
size_t page_start = elf_program_header.p_vaddr / 4096;
size_t page_end = BAN::Math::div_round_up<size_t>(elf_program_header.p_vaddr + elf_program_header.p_memsz, 4096);
size_t page_start = elf_program_header.p_vaddr / PAGE_SIZE;
size_t page_end = BAN::Math::div_round_up<size_t>(elf_program_header.p_vaddr + elf_program_header.p_memsz, PAGE_SIZE);
MUST(process->m_allocated_pages.reserve(page_end - page_start + 1));
for (size_t page = page_start; page <= page_end; page++)
{
auto paddr = Heap::get().take_free_page();
MUST(process->m_allocated_pages.push_back(paddr));
process->m_mmu->map_page_at(paddr, page * 4096, flags);
process->m_mmu->map_page_at(paddr, page * PAGE_SIZE, flags);
}
process->m_mmu->load();
memcpy((void*)elf_program_header.p_vaddr, elf->data() + elf_program_header.p_offset, elf_program_header.p_filesz);