From 3fde8f0158339ac9a3563875a5b8fbe6e264c5e9 Mon Sep 17 00:00:00 2001 From: mintsuki Date: Fri, 22 Sep 2023 16:54:15 -0500 Subject: [PATCH] docs: PROTOCOL.md: Fix up layout of mappings table --- PROTOCOL.md | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/PROTOCOL.md b/PROTOCOL.md index cfe12db1..18dd055f 100644 --- a/PROTOCOL.md +++ b/PROTOCOL.md @@ -87,7 +87,7 @@ The protocol mandates kernels to load themselves at or above `0xffffffff80000000`. Lower half kernels are *not supported*. 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`). 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: ``` - Base Physical Address - Size -> Virtual address - 0x0000000000001000 - 4 GiB plus any additional memory map entry -> 0x0000000000001000 - 0x0000000000000000 - 4 GiB plus any additional memory map entry -> HHDM start + Base Physical Address | | Base Virtual Address + 0x0000000000001000 | (4 GiB - 0x1000) and any additional memory map region | 0x0000000000001000 + 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). The bootloader page tables are in bootloader-reclaimable memory (see Memory Map