590dd77f55
Add the code for the Xen PVH mode boot entry. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> Tested-by: Hans van Kranenburg <hans@knorrie.org>
81 lines
1.9 KiB
ArmAsm
81 lines
1.9 KiB
ArmAsm
/* startup.S - bootstrap GRUB itself */
|
|
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2018 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <grub/symbol.h>
|
|
#include <grub/machine/memory.h>
|
|
|
|
.file "startup_pvh.S"
|
|
.text
|
|
.globl start, _start
|
|
.code32
|
|
|
|
start:
|
|
_start:
|
|
cld
|
|
lgdt gdtdesc
|
|
ljmp $GRUB_MEMORY_MACHINE_PROT_MODE_CSEG, $1f
|
|
1:
|
|
movl $GRUB_MEMORY_MACHINE_PROT_MODE_DSEG, %eax
|
|
mov %eax, %ds
|
|
mov %eax, %es
|
|
mov %eax, %fs
|
|
mov %eax, %gs
|
|
mov %eax, %ss
|
|
leal LOCAL(stack_end), %esp
|
|
|
|
/* Save address of start info structure. */
|
|
mov %ebx, pvh_start_info
|
|
call EXT_C(grub_main)
|
|
/* Doesn't return. */
|
|
|
|
.p2align 3
|
|
gdt:
|
|
.word 0, 0
|
|
.byte 0, 0, 0, 0
|
|
|
|
/* -- code segment --
|
|
* base = 0x00000000, limit = 0xFFFFF (4 KiB Granularity), present
|
|
* type = 32bit code execute/read, DPL = 0
|
|
*/
|
|
.word 0xFFFF, 0
|
|
.byte 0, 0x9A, 0xCF, 0
|
|
|
|
/* -- data segment --
|
|
* base = 0x00000000, limit 0xFFFFF (4 KiB Granularity), present
|
|
* type = 32 bit data read/write, DPL = 0
|
|
*/
|
|
.word 0xFFFF, 0
|
|
.byte 0, 0x92, 0xCF, 0
|
|
|
|
.p2align 3
|
|
/* this is the GDT descriptor */
|
|
gdtdesc:
|
|
.word 0x17 /* limit */
|
|
.long gdt /* addr */
|
|
|
|
.p2align 2
|
|
/* Saved pointer to start info structure. */
|
|
.globl pvh_start_info
|
|
pvh_start_info:
|
|
.long 0
|
|
|
|
.bss
|
|
.space GRUB_MEMORY_MACHINE_PROT_STACK_SIZE
|
|
LOCAL(stack_end):
|