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[boot][kernel] Replace frame allocator with bitmap-based one

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The previous frame allocator involved a lot of splitting and merging
linked lists and lost all information about frames while they were
allocated. The new allocator is based on an array of descriptor
structures and a bitmap. Each memory map region of allocatable memory
becomes one or more descriptors, each mapping up to 1GiB of physical
memory. The descriptors implement two levels of a bitmap tree, and have
a pointer into the large contiguous bitmap to track individual pages.
This commit is contained in:
Justin C. Miller
2021-01-22 00:16:01 -08:00
parent fd8552ca3a
commit aae18fd035
14 changed files with 419 additions and 212 deletions
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8
src/boot/paging.h
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@@ -38,6 +38,14 @@ void allocate_tables(
/// tables in the current PML4.
void add_current_mappings(page_table *new_pml4);
/// Map physical memory pages to virtual addresses in the given page tables.
/// \arg args The kernel args header, used for the page table cache and pml4
/// \arg section The program section to load
void map_pages(
kernel::args::header *args,
uintptr_t phys, uintptr_t virt,
size_t count, bool write_flag, bool exe_flag);
/// Map a program section in physical memory to its virtual address in the
/// given page tables.
/// \arg args The kernel args header, used for the page table cache and pml4