4705b2e804
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>
84 lines
1.6 KiB
ArmAsm
84 lines
1.6 KiB
ArmAsm
/*
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* linux/arch/sh/boot/romimage/head.S
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*
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* Board specific setup code, executed before zImage loader
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*/
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.text
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#include <asm/page.h>
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.global romstart
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romstart:
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/* include board specific setup code */
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#include <mach/romimage.h>
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#ifdef CONFIG_ROMIMAGE_MMCIF
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/* load the romImage to above the empty zero page */
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mov.l empty_zero_page_dst, r4
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mov.l empty_zero_page_dst_adj, r5
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add r5, r4
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mov.l bytes_to_load, r5
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mov.l loader_function, r7
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jsr @r7
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mov r4, r15
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mov.l empty_zero_page_dst, r4
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mov.l empty_zero_page_dst_adj, r5
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add r5, r4
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mov.l loaded_code_offs, r5
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add r5, r4
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jmp @r4
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nop
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.balign 4
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empty_zero_page_dst_adj:
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.long PAGE_SIZE
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bytes_to_load:
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.long end_data - romstart
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loader_function:
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.long mmcif_loader
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loaded_code_offs:
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.long loaded_code - romstart
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loaded_code:
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#endif /* CONFIG_ROMIMAGE_MMCIF */
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/* copy the empty_zero_page contents to where vmlinux expects it */
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mova extra_data_pos, r0
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mov.l extra_data_size, r1
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add r1, r0
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mov.l empty_zero_page_dst, r1
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mov #(PAGE_SHIFT - 4), r4
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mov #1, r3
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shld r4, r3 /* r3 = PAGE_SIZE / 16 */
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1:
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mov.l @r0, r4
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mov.l @(4, r0), r5
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mov.l @(8, r0), r6
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mov.l @(12, r0), r7
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add #16,r0
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mov.l r4, @r1
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mov.l r5, @(4, r1)
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mov.l r6, @(8, r1)
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mov.l r7, @(12, r1)
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dt r3
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add #16,r1
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bf 1b
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/* jump to the zImage entry point located after the zero page data */
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mov #PAGE_SHIFT, r4
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mov #1, r1
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shld r4, r1
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mova extra_data_pos, r0
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add r1, r0
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mov.l extra_data_size, r1
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add r1, r0
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jmp @r0
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nop
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.align 2
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empty_zero_page_dst:
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.long _text
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extra_data_pos:
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extra_data_size:
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.long zero_page_pos - extra_data_pos
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