1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * (C) Copyright 2010,2011 4 * Graeme Russ, <graeme.russ@gmail.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <malloc.h> 11 #include <asm/e820.h> 12 #include <asm/u-boot-x86.h> 13 #include <asm/global_data.h> 14 #include <asm/processor.h> 15 #include <asm/sections.h> 16 #include <asm/arch/sysinfo.h> 17 #include <asm/arch/tables.h> 18 19 DECLARE_GLOBAL_DATA_PTR; 20 21 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries) 22 { 23 int i; 24 25 unsigned num_entries = min(lib_sysinfo.n_memranges, max_entries); 26 if (num_entries < lib_sysinfo.n_memranges) { 27 printf("Warning: Limiting e820 map to %d entries.\n", 28 num_entries); 29 } 30 for (i = 0; i < num_entries; i++) { 31 struct memrange *memrange = &lib_sysinfo.memrange[i]; 32 33 entries[i].addr = memrange->base; 34 entries[i].size = memrange->size; 35 entries[i].type = memrange->type; 36 } 37 return num_entries; 38 } 39 40 /* 41 * This function looks for the highest region of memory lower than 4GB which 42 * has enough space for U-Boot where U-Boot is aligned on a page boundary. It 43 * overrides the default implementation found elsewhere which simply picks the 44 * end of ram, wherever that may be. The location of the stack, the relocation 45 * address, and how far U-Boot is moved by relocation are set in the global 46 * data structure. 47 */ 48 ulong board_get_usable_ram_top(ulong total_size) 49 { 50 uintptr_t dest_addr = 0; 51 int i; 52 53 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 54 struct memrange *memrange = &lib_sysinfo.memrange[i]; 55 /* Force U-Boot to relocate to a page aligned address. */ 56 uint64_t start = roundup(memrange->base, 1 << 12); 57 uint64_t end = memrange->base + memrange->size; 58 59 /* Ignore non-memory regions. */ 60 if (memrange->type != CB_MEM_RAM) 61 continue; 62 63 /* Filter memory over 4GB. */ 64 if (end > 0xffffffffULL) 65 end = 0x100000000ULL; 66 /* Skip this region if it's too small. */ 67 if (end - start < total_size) 68 continue; 69 70 /* Use this address if it's the largest so far. */ 71 if (end > dest_addr) 72 dest_addr = end; 73 } 74 75 /* If no suitable area was found, return an error. */ 76 if (!dest_addr) 77 panic("No available memory found for relocation"); 78 79 return (ulong)dest_addr; 80 } 81 82 int dram_init_f(void) 83 { 84 int i; 85 phys_size_t ram_size = 0; 86 87 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 88 struct memrange *memrange = &lib_sysinfo.memrange[i]; 89 unsigned long long end = memrange->base + memrange->size; 90 91 if (memrange->type == CB_MEM_RAM && end > ram_size) 92 ram_size = end; 93 } 94 gd->ram_size = ram_size; 95 if (ram_size == 0) 96 return -1; 97 return 0; 98 } 99 100 int dram_init_banksize(void) 101 { 102 int i, j; 103 104 if (CONFIG_NR_DRAM_BANKS) { 105 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) { 106 struct memrange *memrange = &lib_sysinfo.memrange[i]; 107 108 if (memrange->type == CB_MEM_RAM) { 109 gd->bd->bi_dram[j].start = memrange->base; 110 gd->bd->bi_dram[j].size = memrange->size; 111 j++; 112 if (j >= CONFIG_NR_DRAM_BANKS) 113 break; 114 } 115 } 116 } 117 return 0; 118 } 119 120 int dram_init(void) 121 { 122 return dram_init_banksize(); 123 } 124