ab31825ab3
Restructuring paging into an object that carries its page cache with it and makes for simpler code. Program loading is also changed to not copy the pages loaded from the file into new pages - we can impose a new constraint that anything loaded by boot have a simple, page-aligned layout so that we can just map the existing pages into the right addresses. Also included are some linker script changes to help accommodate this.
56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
#pragma once
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/// \file memory.h
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/// Memory-related constants and functions.
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#include <stdint.h>
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namespace uefi {
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struct boot_services;
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struct runtime_services;
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}
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namespace boot {
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namespace paging {
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class pager;
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}
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namespace memory {
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class efi_mem_map;
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/// UEFI specifies that pages are always 4 KiB.
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constexpr size_t page_size = 0x1000;
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/// Get the number of pages needed to hold `bytes` bytes
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inline constexpr size_t bytes_to_pages(size_t bytes) {
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return ((bytes - 1) / page_size) + 1;
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}
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/// \defgroup pointer_fixup
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/// Memory virtualization pointer fixup functions. Handles changing affected pointers
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/// when calling UEFI's `set_virtual_address_map` function to change the location of
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/// runtime services in virtual memory.
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/// @{
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/// Set up the pointer fixup UEFI events. This registers the necessary callbacks for
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/// runtime services to call when `set_virtual_address_map` is called.
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void init_pointer_fixup(uefi::boot_services *bs, uefi::runtime_services *rs);
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/// Mark a given pointer as needing to be updated when doing pointer fixup.
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void mark_pointer_fixup(void **p);
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/// @}
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/// Activate the given memory mappings. Sets the given page tables live as well
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/// as informs UEFI runtime services of the new mappings.
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/// \arg pml4 The root page table for the new mappings
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/// \arg map The UEFI memory map, used to update runtime services
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void virtualize(
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paging::pager &pager,
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efi_mem_map &map,
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uefi::runtime_services *rs);
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} // namespace boot
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} // namespace memory
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