kernel-ark/arch/sh/boot/romimage/head.S
Magnus Damm 4705b2e804 sh: add romImage MMCIF boot for sh7724 and Ecovec V2
This patch is V2 of the MMCIF romImage boot support
for sh7724 and the Ecovec board. With this patch
applied and CONFIG_ROMIMAGE_MMCIF selected the
romImage kernel image can be written to a MMC card
and booted directly by the sh7724 cpu.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-05-31 13:11:54 +09:00

85 lines
1.6 KiB
ArmAsm

/*
* linux/arch/sh/boot/romimage/head.S
*
* Board specific setup code, executed before zImage loader
*/
.text
#include <asm/page.h>
.global romstart
romstart:
/* include board specific setup code */
#include <mach/romimage.h>
#ifdef CONFIG_ROMIMAGE_MMCIF
/* load the romImage to above the empty zero page */
mov.l empty_zero_page_dst, r4
mov.l empty_zero_page_dst_adj, r5
add r5, r4
mov.l bytes_to_load, r5
mov.l loader_function, r7
jsr @r7
mov r4, r15
mov.l empty_zero_page_dst, r4
mov.l empty_zero_page_dst_adj, r5
add r5, r4
mov.l loaded_code_offs, r5
add r5, r4
jmp @r4
nop
.balign 4
empty_zero_page_dst_adj:
.long PAGE_SIZE
bytes_to_load:
.long end_data - romstart
loader_function:
.long mmcif_loader
loaded_code_offs:
.long loaded_code - romstart
loaded_code:
#endif /* CONFIG_ROMIMAGE_MMCIF */
/* copy the empty_zero_page contents to where vmlinux expects it */
mova extra_data_pos, r0
mov.l extra_data_size, r1
add r1, r0
mov.l empty_zero_page_dst, r1
mov #(PAGE_SHIFT - 4), r4
mov #1, r3
shld r4, r3 /* r3 = PAGE_SIZE / 16 */
1:
mov.l @r0, r4
mov.l @(4, r0), r5
mov.l @(8, r0), r6
mov.l @(12, r0), r7
add #16,r0
mov.l r4, @r1
mov.l r5, @(4, r1)
mov.l r6, @(8, r1)
mov.l r7, @(12, r1)
dt r3
add #16,r1
bf 1b
/* jump to the zImage entry point located after the zero page data */
mov #PAGE_SHIFT, r4
mov #1, r1
shld r4, r1
mova extra_data_pos, r0
add r1, r0
mov.l extra_data_size, r1
add r1, r0
jmp @r0
nop
.align 2
empty_zero_page_dst:
.long _text
extra_data_pos:
extra_data_size:
.long zero_page_pos - extra_data_pos