| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * (C) Copyright 2011-2012 |
| * Pali Rohár <pali@kernel.org> |
| */ |
| |
| #include <config.h> |
| |
| kernoffs: /* offset of kernel image from this address */ |
| .word . - CONFIG_TEXT_BASE - KERNEL_OFFSET |
| |
| kernaddr: /* address of kernel after copying */ |
| .word KERNEL_ADDRESS |
| |
| kernsize: /* maximal size of kernel image */ |
| .word KERNEL_MAXSIZE |
| |
| imagesize: /* maximal size of image */ |
| .word IMAGE_MAXSIZE |
| |
| ih_magic: /* IH_MAGIC in big endian from include/image.h */ |
| .word 0x56190527 |
| |
| z_magic: /* LINUX_ARM_ZIMAGE_MAGIC */ |
| .word 0x016f2818 |
| |
| /* |
| * Routine: save_boot_params (called after reset from start.S) |
| * Description: Copy attached kernel to address KERNEL_ADDRESS |
| */ |
| |
| .global save_boot_params |
| save_boot_params: |
| |
| /* |
| * Copy valid attached kernel to absolute address KERNEL_ADDRESS |
| * |
| * Nokia X-Loader is loading secondary image to address 0x80400000. |
| * NOLO is loading boot image to random place, so it doesn't really |
| * matter what is set in CONFIG_TEXT_BASE. We have to detect |
| * KERNEL_OFFSET from the current execution address and copy it to |
| * absolute address KERNEL_ADDRESS. |
| * |
| * Note that U-Boot has to be compiled with CONFIG_POSITION_INDEPENDENT |
| * because it is loaded at random address and not to the fixed address |
| * (CONFIG_TEXT_BASE). |
| */ |
| |
| /* r0 - start of kernel before */ |
| adr r0, kernoffs /* r0 - current address of kernoffs section */ |
| ldr r1, kernoffs /* r1 - offset of kernel image from kernoffs section */ |
| sub 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] /* remove 4 bytes header of kernel uImage */ |
| str r5, [r3, #36] /* remove 4 bytes header of kernel zImage */ |
| |
| /* check for valid kernel uImage */ |
| ldr r4, [r0] /* r4 - 4 bytes header of kernel */ |
| ldr r5, ih_magic /* r5 - IH_MAGIC */ |
| cmp r4, r5 |
| beq copy_kernel_loop |
| |
| /* check for valid kernel zImage */ |
| ldr r4, [r0, #36] /* r4 - 4 bytes header of kernel at offset 36 */ |
| ldr r5, z_magic /* r5 - LINUX_ARM_ZIMAGE_MAGIC */ |
| cmp r4, r5 |
| bne skip_copy /* skip if invalid image */ |
| |
| copy_kernel_loop: |
| ldmdb r1!, {r3 - r10} |
| stmdb r2!, {r3 - r10} |
| cmp r1, r0 |
| bhi copy_kernel_loop |
| |
| /* remove header in source kernel image */ |
| mov r5, #0 |
| str r5, [r0] /* remove 4 bytes header of kernel uImage */ |
| str r5, [r0, #36] /* remove 4 bytes header of kernel zImage */ |
| |
| skip_copy: |
| |
| /* Returns */ |
| b save_boot_params_ret |