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docs: PROTOCOL.md: Fix up layout of mappings table

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mintsuki 2023-09-22 16:54:15 -05:00
parent 50f4383f93
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10
PROTOCOL.md
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@ -87,7 +87,7 @@ The protocol mandates kernels to load themselves at or above
`0xffffffff80000000`. Lower half kernels are *not supported*. `0xffffffff80000000`. Lower half kernels are *not supported*.
At handoff, the kernel will be properly loaded and mapped with appropriate At handoff, the kernel will be properly loaded and mapped with appropriate
MMU permissions at the requested virtual memory address (provided it is at MMU permissions, as supervisor, at the requested virtual memory address (provided it is at
or above `0xffffffff80000000`). or above `0xffffffff80000000`).
No specific physical memory placement is guaranteed, except that the kernel No specific physical memory placement is guaranteed, except that the kernel
@ -97,11 +97,11 @@ below.
Alongside the loaded kernel, the bootloader will set up memory mappings as such: Alongside the loaded kernel, the bootloader will set up memory mappings as such:
``` ```
Base Physical Address - Size -> Virtual address Base Physical Address | | Base Virtual Address
0x0000000000001000 - 4 GiB plus any additional memory map entry -> 0x0000000000001000 0x0000000000001000 | (4 GiB - 0x1000) and any additional memory map region | 0x0000000000001000
0x0000000000000000 - 4 GiB plus any additional memory map entry -> HHDM start 0x0000000000000000 | 4 GiB and any additional memory map region | HHDM start
``` ```
Where HHDM start is returned by the Higher Half Direct Map feature (see below). Where "HHDM start" is returned by the Higher Half Direct Map feature (see below).
These mappings are supervisor, read, write, execute (-rwx). These mappings are supervisor, read, write, execute (-rwx).
The bootloader page tables are in bootloader-reclaimable memory (see Memory Map The bootloader page tables are in bootloader-reclaimable memory (see Memory Map