| commit | ccf3fe02e35f4abca2589f99022cc25084bbd8ae | |
| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | |
| Fri, 27 Feb 2009 21:27:38 +0000 (27 13:27 -0800) | ||
| committer | H. Peter Anvin <hpa@zytor.com> | |
| Sun, 15 Mar 2009 00:23:47 +0000 (14 17:23 -0700) | ||
| tree | 3bcf329116b8c689b4da1bb1a0d87bb587d3f3c7 | treesnapshot (tar.gz zip) |
| parent | 5368a2be34b96fda9c05d79424fa63a73ead04ed | commitdiff |
x86-32: use brk segment for allocating initial kernel pagetable
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>
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>