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hw_x86_64: Declare initial pagetables in .data segment

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The table specifies the initial identity mapping for the memory region
from 2 MiB to 4 MiB using one 2 MiB mapping.
This commit is contained in:
Reto Buerki 2015-02-11 15:43:13 +01:00 committed by Christian Helmuth
parent be430b9648
commit bafb893a70
1 changed files with 28 additions and 0 deletions
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28
repos/base-hw/src/core/spec/x86_64/kernel/crt0.s
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@ -12,6 +12,8 @@
* under the terms of the GNU General Public License version 2.
*/
.include "macros.s"
.section ".text.crt0"
/* magic multi-boot header to make GRUB happy */
@ -69,3 +71,29 @@
.p2align 8
.space 32 * 1024
_stack_high:
.data
/****************************************
** Initial pagetables **
** Identity mapping from 2MiB to 4MiB **
****************************************/
/* PML4 */
.p2align MIN_PAGE_SIZE_LOG2
_kernel_pml4:
.quad _kernel_pdp + 0xf
.fill 511, 8, 0x0
/* PDP */
.p2align MIN_PAGE_SIZE_LOG2
_kernel_pdp:
.quad _kernel_pd + 0xf
.fill 511, 8, 0x0
/* PD */
.p2align MIN_PAGE_SIZE_LOG2
_kernel_pd:
.quad 0
.quad 0x20018f
.fill 510, 8, 0x0