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 * SPDX-License-Identifier: GPL-2.0+ 16 */ 17 18 #include <common.h> 19 #include <libfdt.h> 20 #include <malloc.h> 21 #include <asm/u-boot-x86.h> 22 #include <asm/relocate.h> 23 #include <asm/sections.h> 24 #include <elf.h> 25 26 DECLARE_GLOBAL_DATA_PTR; 27 28 int copy_uboot_to_ram(void) 29 { 30 size_t len = (size_t)&__data_end - (size_t)&__text_start; 31 32 memcpy((void *)gd->relocaddr, (void *)&__text_start, len); 33 34 return 0; 35 } 36 37 int copy_fdt_to_ram(void) 38 { 39 if (gd->new_fdt) { 40 ulong fdt_size; 41 42 fdt_size = ALIGN(fdt_totalsize(gd->fdt_blob) + 0x1000, 32); 43 44 memcpy(gd->new_fdt, gd->fdt_blob, fdt_size); 45 debug("Relocated fdt from %p to %p, size %lx\n", 46 gd->fdt_blob, gd->new_fdt, fdt_size); 47 gd->fdt_blob = gd->new_fdt; 48 } 49 50 return 0; 51 } 52 53 int clear_bss(void) 54 { 55 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off; 56 size_t len = (size_t)&__bss_end - (size_t)&__bss_start; 57 58 memset((void *)dst_addr, 0x00, len); 59 60 return 0; 61 } 62 63 /* 64 * This function has more error checking than you might expect. Please see 65 * the commit message for more informaiton. 66 */ 67 int do_elf_reloc_fixups(void) 68 { 69 Elf32_Rel *re_src = (Elf32_Rel *)(&__rel_dyn_start); 70 Elf32_Rel *re_end = (Elf32_Rel *)(&__rel_dyn_end); 71 72 Elf32_Addr *offset_ptr_rom, *last_offset = NULL; 73 Elf32_Addr *offset_ptr_ram; 74 75 /* The size of the region of u-boot that runs out of RAM. */ 76 uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start; 77 78 do { 79 /* Get the location from the relocation entry */ 80 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; 81 82 /* Check that the location of the relocation is in .text */ 83 if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE && 84 offset_ptr_rom > last_offset) { 85 86 /* Switch to the in-RAM version */ 87 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + 88 gd->reloc_off); 89 90 /* Check that the target points into .text */ 91 if (*offset_ptr_ram >= CONFIG_SYS_TEXT_BASE && 92 *offset_ptr_ram <= 93 (CONFIG_SYS_TEXT_BASE + size)) { 94 *offset_ptr_ram += gd->reloc_off; 95 } else { 96 debug(" %p: rom reloc %x, ram %p, value %x," 97 " limit %lx\n", re_src, 98 re_src->r_offset, offset_ptr_ram, 99 *offset_ptr_ram, 100 CONFIG_SYS_TEXT_BASE + size); 101 } 102 } else { 103 debug(" %p: rom reloc %x, last %p\n", re_src, 104 re_src->r_offset, last_offset); 105 } 106 last_offset = offset_ptr_rom; 107 108 } while (++re_src < re_end); 109 110 return 0; 111 } 112