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KernelVM: clean up a bit

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This commit is contained in:
apio 2022-12-07 14:48:50 +01:00
parent 8c04788793
commit b9b7d1e201
Signed by: apio
GPG Key ID: B8A7D06E42258954
1 changed files with 17 additions and 4 deletions
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21
kernel/src/memory/KernelVM.cpp
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@ -21,6 +21,7 @@ namespace KernelVM
void init()
{
g_kernelvm_bitmap.initialize(bitmap_memory, sizeof(bitmap_memory));
g_kernelvm_bitmap.clear(false);
}
Result<u64> alloc_one_page()
@ -36,7 +37,7 @@ namespace KernelVM
return err(ENOMEM);
}
Result<u64> alloc_several_pages(usize count)
bool find_several_pages_impl(usize count, u64& start_index)
{
u64 first_free_index = 0;
u64 free_contiguous_pages = 0;
@ -56,12 +57,24 @@ namespace KernelVM
// Found enough contiguous free pages!!
if (free_contiguous_pages == count)
{
g_used_vm += ARCH_PAGE_SIZE * count;
g_kernelvm_bitmap.clear_region(first_free_index, count, true);
return KERNEL_VM_RANGE_START + (first_free_index * ARCH_PAGE_SIZE);
start_index = first_free_index;
return true;
}
}
return false;
}
Result<u64> alloc_several_pages(const usize count)
{
u64 start_index;
if (find_several_pages_impl(count, start_index))
{
g_kernelvm_bitmap.clear_region(start_index, count, true);
g_used_vm += ARCH_PAGE_SIZE * count;
return KERNEL_VM_RANGE_START + (start_index * ARCH_PAGE_SIZE);
}
return err(ENOMEM);
}