projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 2f16ac9d AB |
1 | /* |
| 2 | * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * SPDX-License-Identifier: GPL-2.0+ | |
| 5 | */ | |
| 6 | ||
| 7 | #include <asm-offsets.h> | |
| 8 | #include <config.h> | |
| 4d93617d | 9 | #include <linux/linkage.h> |
| 2f16ac9d AB |
10 | #include <asm/arcregs.h> |
| 11 | ||
| 4d93617d | 12 | ENTRY(_start) |
| 20a58ac0 IG |
13 | /* Setup interrupt vector base that matches "__text_start" */ |
| 14 | sr __ivt_start, [ARC_AUX_INTR_VEC_BASE] | |
| 15 | ||
| 16 | /* Setup stack pointer */ | |
| 17 | mov %sp, CONFIG_SYS_INIT_SP_ADDR | |
| 18 | mov %fp, %sp | |
| 19 | ||
| 20 | /* Clear bss */ | |
| 21 | mov %r0, __bss_start | |
| 22 | mov %r1, __bss_end | |
| 23 | ||
| 24 | clear_bss: | |
| 25 | st.ab 0, [%r0, 4] | |
| 26 | brlt %r0, %r1, clear_bss | |
| 27 | ||
| 28 | /* Zero the one and only argument of "board_init_f" */ | |
| 29 | mov_s %r0, 0 | |
| 30 | j board_init_f | |
| 4d93617d | 31 | ENDPROC(_start) |
| 20a58ac0 | 32 | |
| 2f16ac9d AB |
33 | /* |
| 34 | * void relocate_code (addr_sp, gd, addr_moni) | |
| 35 | * | |
| 36 | * This "function" does not return, instead it continues in RAM | |
| 37 | * after relocating the monitor code. | |
| 38 | * | |
| 39 | * r0 = start_addr_sp | |
| 40 | * r1 = new__gd | |
| 41 | * r2 = relocaddr | |
| 42 | */ | |
| 4d93617d | 43 | ENTRY(relocate_code) |
| 2f16ac9d AB |
44 | /* |
| 45 | * r0-r12 might be clobbered by C functions | |
| 46 | * so we use r13-r16 for storage here | |
| 47 | */ | |
| 48 | mov %r13, %r0 /* save addr_sp */ | |
| 49 | mov %r14, %r1 /* save addr of gd */ | |
| 50 | mov %r15, %r2 /* save addr of destination */ | |
| 51 | ||
| 52 | mov %r16, %r2 /* %r9 - relocation offset */ | |
| 53 | sub %r16, %r16, __image_copy_start | |
| 54 | ||
| 55 | /* Set up the stack */ | |
| 56 | stack_setup: | |
| 57 | mov %sp, %r13 | |
| 58 | mov %fp, %sp | |
| 59 | ||
| 60 | /* Check if monitor is loaded right in place for relocation */ | |
| 61 | mov %r0, __image_copy_start | |
| 62 | cmp %r0, %r15 /* skip relocation if code loaded */ | |
| 63 | bz do_board_init_r /* in target location already */ | |
| 64 | ||
| 65 | /* Copy data (__image_copy_start - __image_copy_end) to new location */ | |
| 66 | mov %r1, %r15 | |
| 67 | mov %r2, __image_copy_end | |
| 68 | sub %r2, %r2, %r0 /* r3 <- amount of bytes to copy */ | |
| 69 | asr %r2, %r2, 2 /* r3 <- amount of words to copy */ | |
| 70 | mov %lp_count, %r2 | |
| 71 | lp copy_end | |
| 72 | ld.ab %r2,[%r0,4] | |
| 73 | st.ab %r2,[%r1,4] | |
| 74 | copy_end: | |
| 75 | ||
| 76 | /* Fix relocations related issues */ | |
| 77 | bl do_elf_reloc_fixups | |
| 78 | #ifndef CONFIG_SYS_ICACHE_OFF | |
| 79 | bl invalidate_icache_all | |
| 80 | #endif | |
| 81 | #ifndef CONFIG_SYS_DCACHE_OFF | |
| 82 | bl flush_dcache_all | |
| 83 | #endif | |
| 84 | ||
| 85 | /* Update position of intterupt vector table */ | |
| 86 | lr %r0, [ARC_AUX_INTR_VEC_BASE] /* Read current position */ | |
| 87 | add %r0, %r0, %r16 /* Update address */ | |
| 88 | sr %r0, [ARC_AUX_INTR_VEC_BASE] /* Write new position */ | |
| 89 | ||
| 90 | do_board_init_r: | |
| 91 | /* Prepare for exection of "board_init_r" in relocated monitor */ | |
| 92 | mov %r2, board_init_r /* old address of "board_init_r()" */ | |
| 93 | add %r2, %r2, %r16 /* new address of "board_init_r()" */ | |
| 94 | mov %r0, %r14 /* 1-st parameter: gd_t */ | |
| 95 | mov %r1, %r15 /* 2-nd parameter: dest_addr */ | |
| 96 | j [%r2] | |
| 4d93617d | 97 | ENDPROC(relocate_code) |