mirror of https://gitee.com/openkylin/linux.git
102 lines
2.4 KiB
ArmAsm
102 lines
2.4 KiB
ArmAsm
/*
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* The head-file for SH-Mobile ARM platforms
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*
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* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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* Simon Horman <horms@verge.net.au>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifdef CONFIG_ZBOOT_ROM
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.section ".start", "ax"
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/* load board-specific initialization code */
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#include <mach/zboot.h>
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#if defined(CONFIG_ZBOOT_ROM_MMCIF) || defined(CONFIG_ZBOOT_ROM_SH_MOBILE_SDHI)
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/* Load image from MMC/SD */
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adr sp, __tmp_stack + 256
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ldr r0, __image_start
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ldr r1, __image_end
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subs r1, r1, r0
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ldr r0, __load_base
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bl mmc_loader
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/* Jump to loaded code */
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ldr r0, __loaded
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ldr r1, __image_start
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sub r0, r0, r1
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ldr r1, __load_base
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add pc, r0, r1
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__image_start:
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.long _start
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__image_end:
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.long _got_end
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__load_base:
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.long MEMORY_START + 0x02000000 @ Load at 32Mb into SDRAM
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__loaded:
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.long __continue
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.align
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__tmp_stack:
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.space 256
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__continue:
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#endif /* CONFIG_ZBOOT_ROM_MMC || CONFIG_ZBOOT_ROM_SH_MOBILE_SDHI */
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adr r0, dtb_info
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ldmia r0, {r1, r3, r4, r5, r7}
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sub r0, r0, r1 @ calculate the delta offset
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add r5, r5, r0 @ _edata
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ldr lr, [r5, #0] @ check if valid DTB is present
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cmp lr, r3
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bne 0f
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add r9, r7, #31 @ rounded up to a multiple
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bic r9, r9, #31 @ ... of 32 bytes
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add r6, r9, r5 @ copy from _edata
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add r9, r9, r4 @ to MEMORY_START
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1: ldmdb r6!, {r0 - r3, r10 - r12, lr}
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cmp r6, r5
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stmdb r9!, {r0 - r3, r10 - r12, lr}
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bhi 1b
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/* Success: Zero board ID, pointer to start of memory for atag/dtb */
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mov r7, #0
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mov r8, r4
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b 2f
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.align 2
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dtb_info:
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.word dtb_info
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#ifndef __ARMEB__
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.word 0xedfe0dd0 @ sig is 0xd00dfeed big endian
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#else
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.word 0xd00dfeed
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#endif
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.word MEMORY_START
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.word _edata
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.word 0x4000 @ maximum DTB size
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0:
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/* Failure: Zero board ID, NULL atag/dtb */
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mov r7, #0
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mov r8, #0 @ pass null pointer as atag
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2 :
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#endif /* CONFIG_ZBOOT_ROM */
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