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x86-32: use brk segment for allocating initial kernel pagetable

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Impact: use new interface instead of previous ad hoc implementation

Rather than having special purpose init_pg_table_start/end variables
to delimit the kernel pagetable built by head_32.S, just use the brk
mechanism to extend the bss for the new pagetable.

This patch removes init_pg_table_start/end and pg0, defines __brk_base
(which is page-aligned and immediately follows _end), initializes
the brk region to start there, and uses it for the 32-bit pagetable.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Jeremy Fitzhardinge
2009-02-27 13:27:38 -08:00
committed by H. Peter Anvin
parent 5368a2be34
commit ccf3fe02e3
7 changed files with 7 additions and 34 deletions
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4
arch/x86/kernel/vmlinux_32.lds.S
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@@ -196,10 +196,6 @@ SECTIONS
__brk_limit = . ;
_end = . ;
/* This is where the kernel creates the early boot page tables */
. = ALIGN(PAGE_SIZE);
pg0 = . ;
}
/* Sections to be discarded */