From 24f50f0c008bbcbe6c93d3f203efb201717c48e6 Mon Sep 17 00:00:00 2001 From: Alexander Kuleshov Date: Sun, 31 Jul 2022 15:56:02 +0600 Subject: [PATCH] init: improve sentence in linux-initialization-3.md related issue - #676 Signed-off-by: Alexander Kuleshov --- Initialization/linux-initialization-3.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Initialization/linux-initialization-3.md b/Initialization/linux-initialization-3.md index 15c76c7..ad91685 100644 --- a/Initialization/linux-initialization-3.md +++ b/Initialization/linux-initialization-3.md @@ -29,10 +29,10 @@ Now let's look at `__va` macro. This macro defined in [init/main.c](https://gith #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET)) ``` -where `PAGE_OFFSET` is `__PAGE_OFFSET` which is `0xffff880000000000` and the base virtual address of the direct mapping of all physical memory. So we're getting virtual address of the `boot_params` structure and pass it to the `copy_bootdata` function, where we copy `real_mod_data` to the `boot_params` which is declared in the [arch/x86/include/asm/setup.h](https://github.com/torvalds/linux/blob/16f73eb02d7e1765ccab3d2018e0bd98eb93d973/arch/x86/include/asm/setup.h) +where `PAGE_OFFSET` is `__PAGE_OFFSET` which is `0xffff880000000000` and the base virtual address of the direct mapping of all physical memory. So we're getting virtual address of variable `boot_params` which come along from real mode, and pass it to the `copy_bootdata` function, where we copy `real_mode_data` to the `boot_params` which is defined in the [arch/x86/kernel/setup.c](https://github.com/torvalds/linux/blob/d9919d43cbf6790d2bc0c0a2743c51fc25f26919/arch/x86/kernel/setup.c) ```C -extern struct boot_params boot_params; +struct boot_params boot_params; ``` Let's look at the `copy_boot_data` implementation: