1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * linux/arch/sh/boot/romimage/head.S 4 * 5 * Board specific setup code, executed before zImage loader 6 */ 7 8 .text 9 #include <asm/page.h> 10 11 .global romstart 12 romstart: 13 /* include board specific setup code */ 14 #include <mach/romimage.h> 15 16 #ifdef CONFIG_ROMIMAGE_MMCIF 17 /* load the romImage to above the empty zero page */ 18 mov.l empty_zero_page_dst, r4 19 mov.l empty_zero_page_dst_adj, r5 20 add r5, r4 21 mov.l bytes_to_load, r5 22 mov.l loader_function, r7 23 jsr @r7 24 mov r4, r15 25 26 mov.l empty_zero_page_dst, r4 27 mov.l empty_zero_page_dst_adj, r5 28 add r5, r4 29 mov.l loaded_code_offs, r5 30 add r5, r4 31 jmp @r4 32 nop 33 34 .balign 4 35 empty_zero_page_dst_adj: 36 .long PAGE_SIZE 37 bytes_to_load: 38 .long end_data - romstart 39 loader_function: 40 .long mmcif_loader 41 loaded_code_offs: 42 .long loaded_code - romstart 43 loaded_code: 44 #endif /* CONFIG_ROMIMAGE_MMCIF */ 45 46 /* copy the empty_zero_page contents to where vmlinux expects it */ 47 mova extra_data_pos, r0 48 mov.l extra_data_size, r1 49 add r1, r0 50 mov.l empty_zero_page_dst, r1 51 mov #(PAGE_SHIFT - 4), r4 52 mov #1, r3 53 shld r4, r3 /* r3 = PAGE_SIZE / 16 */ 54 55 1: 56 mov.l @r0, r4 57 mov.l @(4, r0), r5 58 mov.l @(8, r0), r6 59 mov.l @(12, r0), r7 60 add #16,r0 61 mov.l r4, @r1 62 mov.l r5, @(4, r1) 63 mov.l r6, @(8, r1) 64 mov.l r7, @(12, r1) 65 dt r3 66 add #16,r1 67 bf 1b 68 69 /* jump to the zImage entry point located after the zero page data */ 70 mov #PAGE_SHIFT, r4 71 mov #1, r1 72 shld r4, r1 73 mova extra_data_pos, r0 74 add r1, r0 75 mov.l extra_data_size, r1 76 add r1, r0 77 jmp @r0 78 nop 79 80 .align 2 81 empty_zero_page_dst: 82 .long _text 83 extra_data_pos: 84 extra_data_size: 85 .long zero_page_pos - extra_data_pos 86