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https://github.com/smaeul/u-boot.git
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1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
194 lines
3.9 KiB
ArmAsm
194 lines
3.9 KiB
ArmAsm
/*
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* (C) Copyright 2011-2012
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* Pali Rohár <pali.rohar@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <config.h>
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relocaddr: /* address of this relocaddr section after coping */
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.word . /* address of section (calculated at compile time) */
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startaddr: /* address of u-boot after copying */
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.word CONFIG_SYS_TEXT_BASE
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kernaddr: /* address of kernel after copying */
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.word KERNEL_ADDRESS
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kernsize: /* maximal size of kernel image */
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.word KERNEL_MAXSIZE
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kernoffs: /* offset of kernel image in loaded u-boot */
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.word KERNEL_OFFSET
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imagesize: /* maximal size of image */
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.word IMAGE_MAXSIZE
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ih_magic: /* IH_MAGIC in big endian from include/image.h */
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.word 0x56190527
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/*
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* Routine: save_boot_params (called after reset from start.S)
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* Description: Copy attached kernel to address KERNEL_ADDRESS
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* Copy u-boot to address CONFIG_SYS_TEXT_BASE
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* Return to copied u-boot address
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*/
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.global save_boot_params
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save_boot_params:
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/* Copy valid attached kernel to address KERNEL_ADDRESS */
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copy_kernel_start:
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adr r0, relocaddr /* r0 - address of section relocaddr */
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ldr r1, relocaddr /* r1 - address of relocaddr after relocation */
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cmp r0, r1
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/* r4 - calculated offset */
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subhi r4, r0, r1
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sublo r4, r1, r0
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/* r0 - start of kernel before */
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ldr r0, startaddr
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addhi r0, r0, r4
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sublo r0, r0, r4
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ldr r1, kernoffs
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add r0, r0, r1
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/* r3 - start of kernel after */
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ldr r3, kernaddr
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/* r2 - end of kernel after */
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ldr r1, kernsize
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add r2, r3, r1
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/* r1 - end of kernel before */
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add r1, r0, r1
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/* remove header in target kernel */
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mov r5, #0
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str r5, [r3]
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/* check for valid kernel uImage */
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ldr r4, [r0] /* r4 - 4 bytes header of kernel */
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ldr r5, ih_magic /* r5 - IH_MAGIC */
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cmp r4, r5
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bne copy_kernel_end /* skip if invalid image */
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copy_kernel_loop:
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ldmdb r1!, {r3 - r10}
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stmdb r2!, {r3 - r10}
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cmp r1, r0
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bhi copy_kernel_loop
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copy_kernel_end:
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mov r5, #0
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str r5, [r0] /* remove 4 bytes header of kernel */
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/* Fix u-boot code */
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fix_start:
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adr r0, relocaddr /* r0 - address of section relocaddr */
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ldr r1, relocaddr /* r1 - address of relocaddr after relocation */
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cmp r0, r1
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beq copy_uboot_end /* skip if u-boot is on correct address */
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/* r5 - calculated offset */
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subhi r5, r0, r1
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sublo r5, r1, r0
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/* r6 - maximal u-boot size */
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ldr r6, imagesize
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/* fix return address */
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subhi lr, lr, r5
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addlo lr, lr, r5
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/* r1 - start of u-boot after */
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ldr r1, startaddr
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/* r0 - start of u-boot before */
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addhi r0, r1, r5
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sublo r0, r1, r5
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/* check if we need to move uboot copy code before calling it */
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cmp r5, r6
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bhi copy_uboot_start /* now coping u-boot code directly is safe */
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copy_code_start:
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/* r0 - start of u-boot before */
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/* r1 - start of u-boot after */
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/* r6 - maximal u-boot size */
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/* r7 - maximal kernel size */
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ldr r7, kernsize
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/* r4 - end of kernel before */
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add r4, r0, r6
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add r4, r4, r7
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/* r5 - end of u-boot after */
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ldr r5, startaddr
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add r5, r5, r6
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/* r2 - start of loop code after */
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cmp r4, r5 /* higher address (r4 or r5) */
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movhs r2, r4
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movlo r2, r5
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/* r3 - end of loop code before */
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adr r3, end
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/* r4 - end of loop code after */
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adr r4, copy_uboot_start
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sub r4, r3, r4
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add r4, r2, r4
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copy_code_loop:
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ldmdb r3!, {r7 - r10}
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stmdb r4!, {r7 - r10}
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cmp r4, r2
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bhi copy_code_loop
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copy_code_end:
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mov pc, r2
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/* Copy u-boot to address CONFIG_SYS_TEXT_BASE */
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copy_uboot_start:
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/* r0 - start of u-boot before */
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/* r1 - start of u-boot after */
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/* r6 - maximal u-boot size */
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/* r2 - end of u-boot after */
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add r2, r1, r6
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/* condition for copying from left to right */
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cmp r0, r1
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addlo r1, r0, r6 /* r1 - end of u-boot before */
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blo copy_uboot_loop_right
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copy_uboot_loop_left:
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ldmia r0!, {r3 - r10}
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stmia r1!, {r3 - r10}
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cmp r1, r2
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blo copy_uboot_loop_left
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b copy_uboot_end
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copy_uboot_loop_right:
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ldmdb r1!, {r3 - r10}
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stmdb r2!, {r3 - r10}
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cmp r1, r0
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bhi copy_uboot_loop_right
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copy_uboot_end:
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bx lr
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end:
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