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Kernel: Use a RangeAllocator for kernel-only virtual space allocation too.

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This commit is contained in:
Andreas Kling 2019-05-17 04:02:29 +02:00
parent b1bb737704
commit 4a6fcfbacf
4 changed files with 15 additions and 9 deletions
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12
Kernel/VM/MemoryManager.cpp
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@ -20,6 +20,7 @@ MemoryManager& MM
}
MemoryManager::MemoryManager()
: m_range_allocator(LinearAddress(0xc0000000), 0x3f000000)
{
// FIXME: This is not the best way to do memory map detection.
// Rewrite to use BIOS int 15,e820 once we have VM86 support.
@ -400,14 +401,11 @@ RetainPtr<Region> MemoryManager::allocate_kernel_region(size_t size, String&& na
{
InterruptDisabler disabler;
// FIXME: We need a linear address space allocator.
static dword next_laddr = 0xd0000000;
ASSERT(!(size % PAGE_SIZE));
LinearAddress laddr(next_laddr);
next_laddr += size + 16384;
auto region = adopt(*new Region(laddr, size, move(name), true, true, false));
MM.map_region_at_address(*m_kernel_page_directory, *region, laddr, false);
auto range = m_range_allocator.allocate_anywhere(size);
ASSERT(range.is_valid());
auto region = adopt(*new Region(range.base(), range.size(), move(name), true, true, false));
MM.map_region_at_address(*m_kernel_page_directory, *region, range.base(), false);
// FIXME: It would be cool if these could zero-fill on demand instead.
region->commit();
return region;