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SubjectRe: [PATCH 1/2] Use structs instead of hardcoded offsets in x86 boot decompressor.
Rik van Riel wrote:
>
> People who wonder why these pointers never get initialized: they
> point to the zeropage, which of course lives at address zero.
>
> /* The so-called "zeropage" */
> struct boot_params {
> struct screen_info screen_info; /* 0x000 */
> struct apm_bios_info apm_bios_info; /* 0x040 */
> __u8 _pad2[12]; /* 0x054 */
> struct ist_info ist_info; /* 0x060 */
> ...
>

Uhm... except it doesn't live at address zero, at all.

It's called "zeropage" because we used to recycle it into
empty_zero_page, a long long time ago.

The bootparms structure is pointed to by %esi being passed from the
setup code to the decompressor to the kernel.

-hpa


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