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 <libfdt.h> 36 #include <malloc.h> 37 #include <asm/u-boot-x86.h> 38 #include <asm/relocate.h> 39 #include <asm/sections.h> 40 #include <elf.h> 41 42 int copy_uboot_to_ram(void) 43 { 44 size_t len = (size_t)&__data_end - (size_t)&__text_start; 45 46 memcpy((void *)gd->relocaddr, (void *)&__text_start, len); 47 48 return 0; 49 } 50 51 int copy_fdt_to_ram(void) 52 { 53 if (gd->new_fdt) { 54 ulong fdt_size; 55 56 fdt_size = ALIGN(fdt_totalsize(gd->fdt_blob) + 0x1000, 32); 57 58 memcpy(gd->new_fdt, gd->fdt_blob, fdt_size); 59 debug("Relocated fdt from %p to %p, size %lx\n", 60 gd->fdt_blob, gd->new_fdt, fdt_size); 61 gd->fdt_blob = gd->new_fdt; 62 } 63 64 return 0; 65 } 66 67 int clear_bss(void) 68 { 69 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off; 70 size_t len = (size_t)&__bss_end - (size_t)&__bss_start; 71 72 memset((void *)dst_addr, 0x00, len); 73 74 return 0; 75 } 76 77 /* 78 * This function has more error checking than you might expect. Please see 79 * the commit message for more informaiton. 80 */ 81 int do_elf_reloc_fixups(void) 82 { 83 Elf32_Rel *re_src = (Elf32_Rel *)(&__rel_dyn_start); 84 Elf32_Rel *re_end = (Elf32_Rel *)(&__rel_dyn_end); 85 86 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 87 Elf32_Addr *offset_ptr_ram; 88 89 /* The size of the region of u-boot that runs out of RAM. */ 90 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start; 91 92 do { 93 /* Get the location from the relocation entry */ 94 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; 95 96 /* Check that the location of the relocation is in .text */ 97 if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE && 98 offset_ptr_rom > last_offset) { 99 100 /* Switch to the in-RAM version */ 101 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 102 gd->reloc_off); 103 104 /* Check that the target points into .text */ 105 if (*offset_ptr_ram >= CONFIG_SYS_TEXT_BASE && 106 *offset_ptr_ram <= 107 (CONFIG_SYS_TEXT_BASE + size)) { 108 *offset_ptr_ram += gd->reloc_off; 109 } else { 110 debug(" %p: rom reloc %x, ram %p, value %x," 111 " limit %lx\n", re_src, 112 re_src->r_offset, offset_ptr_ram, 113 *offset_ptr_ram, 114 CONFIG_SYS_TEXT_BASE + size); 115 } 116 } else { 117 debug(" %p: rom reloc %x, last %p\n", re_src, 118 re_src->r_offset, last_offset); 119 } 120 last_offset = offset_ptr_rom; 121 122 } while (++re_src < re_end); 123 124 return 0; 125 } 126