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Move page table allocation to top 256GiB.

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I forgot to account for tracking page table physical addresses, so
this is a bit of an overhaul. Major changes:
- Refactor bootstrap code into more functions and:
  - Only allocate 32 pages of scratch space
  - Remap remaining space into top 256GiB, the "page table space"
- Use the page table space to directly offset-map page table pages
  from their physical addresses, to avoid tracking overhead.
- Refactor page_block list functions into static functions to better
  handle null/empty lists
This commit is contained in:
Justin C. Miller
2018-04-22 21:52:59 -07:00
parent 571cc5a1da
commit 1de73de2e3
4 changed files with 364 additions and 153 deletions
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7
src/boot/memory.c
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@@ -66,10 +66,11 @@ memory_init_pointer_fixup(EFI_BOOT_SERVICES *bootsvc, EFI_RUNTIME_SERVICES *runs
CHECK_EFI_STATUS_OR_RETURN(status, "Failed to initialize pointer update event.");
// Reserve a page for our replacement PML4
// Reserve a page for our replacement PML4, plus some pages for the kernel to use
// as page tables while it gets started.
EFI_PHYSICAL_ADDRESS addr = 0;
status = bootsvc->AllocatePages(AllocateAnyPages, EfiLoaderData, 4, &addr);
CHECK_EFI_STATUS_OR_RETURN(status, "Failed to allocate PML4 page.");
status = bootsvc->AllocatePages(AllocateAnyPages, EfiLoaderData, 16, &addr);
CHECK_EFI_STATUS_OR_RETURN(status, "Failed to allocate page table pages.");
new_pml4 = (uint64_t *)addr;
}