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Kernel: Removing hardcoded offsets from Memory Manager

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Now the kernel page directory and the page tables are located at a
safe address, to prevent from paging data colliding with garbage.
This commit is contained in:
supercomputer7 2019-11-08 16:37:33 +02:00 • committed by Andreas Kling
parent 39fcd92210
commit c3c905aa6c
5 changed files with 18 additions and 12 deletions
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14
Kernel/VM/MemoryManager.cpp
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@ -20,13 +20,11 @@ MemoryManager& MM
return *s_the;
}
MemoryManager::MemoryManager()
MemoryManager::MemoryManager(u32 physical_address_for_kernel_page_tables)
{
// FIXME: Hard-coding these is stupid. Find a better way.
m_kernel_page_directory = PageDirectory::create_at_fixed_address(PhysicalAddress(0x4000));
m_page_table_zero = (PageTableEntry*)0x6000;
m_page_table_one = (PageTableEntry*)0x7000;
m_kernel_page_directory = PageDirectory::create_at_fixed_address(PhysicalAddress(physical_address_for_kernel_page_tables));
m_page_table_zero = (PageTableEntry*)(physical_address_for_kernel_page_tables + PAGE_SIZE);
m_page_table_one = (PageTableEntry*)(physical_address_for_kernel_page_tables + PAGE_SIZE * 2);
initialize_paging();
kprintf("MM initialized.\n");
@ -262,9 +260,9 @@ void MemoryManager::create_identity_mapping(PageDirectory& page_directory, Virtu
}
}
void MemoryManager::initialize()
void MemoryManager::initialize(u32 physical_address_for_kernel_page_tables)
{
s_the = new MemoryManager;
s_the = new MemoryManager(physical_address_for_kernel_page_tables);
}
Region* MemoryManager::kernel_region_from_vaddr(VirtualAddress vaddr)