2 * (C) Copyright 2008-2011
3 * Graeme Russ, <graeme.russ@gmail.com>
6 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
9 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
13 * Marius Groeger <mgroeger@sysgo.de>
15 * See file CREDITS for list of people who contributed to this
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.
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.
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,
36 #include <asm/u-boot-x86.h>
39 static int copy_uboot_to_ram(void);
40 static int clear_bss(void);
41 static int do_elf_reloc_fixups(void);
43 static int copy_uboot_to_ram(void)
45 size_t len = (size_t)&__data_end - (size_t)&__text_start;
47 memcpy((void *)gd->relocaddr, (void *)&__text_start, len);
52 static int clear_bss(void)
54 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
55 size_t len = (size_t)&__bss_end - (size_t)&__bss_start;
57 memset((void *)dst_addr, 0x00, len);
62 static int do_elf_reloc_fixups(void)
64 Elf32_Rel *re_src = (Elf32_Rel *)(&__rel_dyn_start);
65 Elf32_Rel *re_end = (Elf32_Rel *)(&__rel_dyn_end);
67 Elf32_Addr *offset_ptr_rom;
68 Elf32_Addr *offset_ptr_ram;
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;
74 /* Get the location from the relocation entry */
75 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
77 /* Check that the location of the relocation is in .text */
78 if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE) {
80 /* Switch to the in-RAM version */
81 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
84 /* Check that the target points into .text */
85 if (*offset_ptr_ram >= CONFIG_SYS_TEXT_BASE &&
87 (CONFIG_SYS_TEXT_BASE + size)) {
88 *offset_ptr_ram += gd->reloc_off;
91 } while (re_src++ < re_end);
96 void relocate_code(ulong dummy_1, gd_t *id, ulong dummy_2)
99 * Copy U-Boot into RAM, clear the BSS and perform relocation
104 do_elf_reloc_fixups();
107 * Transfer execution from Flash to RAM by calculating the address
108 * of the in-RAM copy of board_init_r() and calling it
110 (board_init_r + gd->reloc_off)(gd, gd->relocaddr);
112 /* NOTREACHED - board_init_r() does not return */