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