1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * (C) Copyright 2010,2011 4 * Graeme Russ, <graeme.russ@gmail.com> 5 * 6 * See file CREDITS for list of people who contributed to this 7 * project. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation; either version 2 of 12 * the License, or (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but without any warranty; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 22 * MA 02111-1307 USA 23 */ 24 25 #include <common.h> 26 #include <malloc.h> 27 #include <asm/e820.h> 28 #include <asm/u-boot-x86.h> 29 #include <asm/global_data.h> 30 #include <asm/processor.h> 31 #include <asm/arch/sysinfo.h> 32 #include <asm/arch/tables.h> 33 34 DECLARE_GLOBAL_DATA_PTR; 35 36 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries) 37 { 38 int i; 39 40 unsigned num_entries = min(lib_sysinfo.n_memranges, max_entries); 41 if (num_entries < lib_sysinfo.n_memranges) { 42 printf("Warning: Limiting e820 map to %d entries.\n", 43 num_entries); 44 } 45 for (i = 0; i < num_entries; i++) { 46 struct memrange *memrange = &lib_sysinfo.memrange[i]; 47 48 entries[i].addr = memrange->base; 49 entries[i].size = memrange->size; 50 entries[i].type = memrange->type; 51 } 52 return num_entries; 53 } 54 55 /* 56 * This function looks for the highest region of memory lower than 4GB which 57 * has enough space for U-Boot where U-Boot is aligned on a page boundary. It 58 * overrides the default implementation found elsewhere which simply picks the 59 * end of ram, wherever that may be. The location of the stack, the relocation 60 * address, and how far U-Boot is moved by relocation are set in the global 61 * data structure. 62 */ 63 int calculate_relocation_address(void) 64 { 65 const uint64_t uboot_size = (uintptr_t)&__bss_end - 66 (uintptr_t)&__text_start; 67 const uint64_t total_size = uboot_size + CONFIG_SYS_MALLOC_LEN + 68 CONFIG_SYS_STACK_SIZE; 69 uintptr_t dest_addr = 0; 70 int i; 71 72 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 73 struct memrange *memrange = &lib_sysinfo.memrange[i]; 74 /* Force U-Boot to relocate to a page aligned address. */ 75 uint64_t start = roundup(memrange->base, 1 << 12); 76 uint64_t end = memrange->base + memrange->size; 77 78 /* Ignore non-memory regions. */ 79 if (memrange->type != CB_MEM_RAM) 80 continue; 81 82 /* Filter memory over 4GB. */ 83 if (end > 0xffffffffULL) 84 end = 0x100000000ULL; 85 /* Skip this region if it's too small. */ 86 if (end - start < total_size) 87 continue; 88 89 /* Use this address if it's the largest so far. */ 90 if (end - uboot_size > dest_addr) 91 dest_addr = end; 92 } 93 94 /* If no suitable area was found, return an error. */ 95 if (!dest_addr) 96 return 1; 97 98 dest_addr -= uboot_size; 99 dest_addr &= ~((1 << 12) - 1); 100 gd->relocaddr = dest_addr; 101 gd->reloc_off = dest_addr - (uintptr_t)&__text_start; 102 gd->start_addr_sp = dest_addr - CONFIG_SYS_MALLOC_LEN; 103 104 return 0; 105 } 106 107 int dram_init_f(void) 108 { 109 int i; 110 phys_size_t ram_size = 0; 111 112 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 113 struct memrange *memrange = &lib_sysinfo.memrange[i]; 114 unsigned long long end = memrange->base + memrange->size; 115 116 if (memrange->type == CB_MEM_RAM && end > ram_size) 117 ram_size = end; 118 } 119 gd->ram_size = ram_size; 120 if (ram_size == 0) 121 return -1; 122 return 0; 123 } 124 125 int dram_init(void) 126 { 127 int i, j; 128 129 if (CONFIG_NR_DRAM_BANKS) { 130 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) { 131 struct memrange *memrange = &lib_sysinfo.memrange[i]; 132 133 if (memrange->type == CB_MEM_RAM) { 134 gd->bd->bi_dram[j].start = memrange->base; 135 gd->bd->bi_dram[j].size = memrange->size; 136 j++; 137 if (j >= CONFIG_NR_DRAM_BANKS) 138 break; 139 } 140 } 141 } 142 return 0; 143 } 144