1 /* 2 * (C) Copyright 2008-2011 3 * Graeme Russ, <graeme.russ@gmail.com> 4 * 5 * (C) Copyright 2002 6 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> 7 * 8 * (C) Copyright 2002 9 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> 10 * 11 * (C) Copyright 2002 12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 13 * Marius Groeger <mgroeger@sysgo.de> 14 * 15 * See file CREDITS for list of people who contributed to this 16 * project. 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License as 20 * published by the Free Software Foundation; either version 2 of 21 * the License, or (at your option) any later version. 22 * 23 * This program is distributed in the hope that it will be useful, 24 * but WITHOUT ANY WARRANTY; without even the implied warranty of 25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 26 * GNU General Public License for more details. 27 * 28 * You should have received a copy of the GNU General Public License 29 * along with this program; if not, write to the Free Software 30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 31 * MA 02111-1307 USA 32 */ 33 34 #include <common.h> 35 #include <malloc.h> 36 #include <asm/u-boot-x86.h> 37 #include <elf.h> 38 39 static int copy_uboot_to_ram(void); 40 static int clear_bss(void); 41 static int do_elf_reloc_fixups(void); 42 43 static int copy_uboot_to_ram(void) 44 { 45 size_t len = (size_t)&__data_end - (size_t)&__text_start; 46 47 memcpy((void *)gd->relocaddr, (void *)&__text_start, len); 48 49 return 0; 50 } 51 52 static int clear_bss(void) 53 { 54 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off; 55 size_t len = (size_t)&__bss_end - (size_t)&__bss_start; 56 57 memset((void *)dst_addr, 0x00, len); 58 59 return 0; 60 } 61 62 static int do_elf_reloc_fixups(void) 63 { 64 Elf32_Rel *re_src = (Elf32_Rel *)(&__rel_dyn_start); 65 Elf32_Rel *re_end = (Elf32_Rel *)(&__rel_dyn_end); 66 67 Elf32_Addr *offset_ptr_rom; 68 Elf32_Addr *offset_ptr_ram; 69 70 /* The size of the region of u-boot that runs out of RAM. */ 71 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start; 72 73 do { 74 /* Get the location from the relocation entry */ 75 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; 76 77 /* Check that the location of the relocation is in .text */ 78 if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE) { 79 80 /* Switch to the in-RAM version */ 81 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 82 gd->reloc_off); 83 84 /* Check that the target points into .text */ 85 if (*offset_ptr_ram >= CONFIG_SYS_TEXT_BASE && 86 *offset_ptr_ram < 87 (CONFIG_SYS_TEXT_BASE + size)) { 88 *offset_ptr_ram += gd->reloc_off; 89 } 90 } 91 } while (re_src++ < re_end); 92 93 return 0; 94 } 95 96 void relocate_code(ulong dummy_1, gd_t *id, ulong dummy_2) 97 { 98 /* 99 * Copy U-Boot into RAM, clear the BSS and perform relocation 100 * adjustments 101 */ 102 copy_uboot_to_ram(); 103 clear_bss(); 104 do_elf_reloc_fixups(); 105 106 /* 107 * Transfer execution from Flash to RAM by calculating the address 108 * of the in-RAM copy of board_init_r() and calling it 109 */ 110 (board_init_r + gd->reloc_off)(gd, gd->relocaddr); 111 112 /* NOTREACHED - board_init_r() does not return */ 113 while (1) 114 ; 115 } 116