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 <asm/e820.h> 11 #include <asm/arch/sysinfo.h> 12 #include <asm/arch/tables.h> 13 14 DECLARE_GLOBAL_DATA_PTR; 15 16 unsigned install_e820_map(unsigned max_entries, struct e820entry *entries) 17 { 18 unsigned num_entries; 19 int i; 20 21 num_entries = min((unsigned)lib_sysinfo.n_memranges, max_entries); 22 if (num_entries < lib_sysinfo.n_memranges) { 23 printf("Warning: Limiting e820 map to %d entries.\n", 24 num_entries); 25 } 26 for (i = 0; i < num_entries; i++) { 27 struct memrange *memrange = &lib_sysinfo.memrange[i]; 28 29 entries[i].addr = memrange->base; 30 entries[i].size = memrange->size; 31 32 /* 33 * coreboot has some extensions (type 6 & 16) to the E820 types. 34 * When we detect this, mark it as E820_RESERVED. 35 */ 36 if (memrange->type == CB_MEM_VENDOR_RSVD || 37 memrange->type == CB_MEM_TABLE) 38 entries[i].type = E820_RESERVED; 39 else 40 entries[i].type = memrange->type; 41 } 42 43 return num_entries; 44 } 45 46 /* 47 * This function looks for the highest region of memory lower than 4GB which 48 * has enough space for U-Boot where U-Boot is aligned on a page boundary. It 49 * overrides the default implementation found elsewhere which simply picks the 50 * end of ram, wherever that may be. The location of the stack, the relocation 51 * address, and how far U-Boot is moved by relocation are set in the global 52 * data structure. 53 */ 54 ulong board_get_usable_ram_top(ulong total_size) 55 { 56 uintptr_t dest_addr = 0; 57 int i; 58 59 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 60 struct memrange *memrange = &lib_sysinfo.memrange[i]; 61 /* Force U-Boot to relocate to a page aligned address. */ 62 uint64_t start = roundup(memrange->base, 1 << 12); 63 uint64_t end = memrange->base + memrange->size; 64 65 /* Ignore non-memory regions. */ 66 if (memrange->type != CB_MEM_RAM) 67 continue; 68 69 /* Filter memory over 4GB. */ 70 if (end > 0xffffffffULL) 71 end = 0x100000000ULL; 72 /* Skip this region if it's too small. */ 73 if (end - start < total_size) 74 continue; 75 76 /* Use this address if it's the largest so far. */ 77 if (end > dest_addr) 78 dest_addr = end; 79 } 80 81 /* If no suitable area was found, return an error. */ 82 if (!dest_addr) 83 panic("No available memory found for relocation"); 84 85 return (ulong)dest_addr; 86 } 87 88 int dram_init(void) 89 { 90 int i; 91 phys_size_t ram_size = 0; 92 93 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 94 struct memrange *memrange = &lib_sysinfo.memrange[i]; 95 unsigned long long end = memrange->base + memrange->size; 96 97 if (memrange->type == CB_MEM_RAM && end > ram_size) 98 ram_size += memrange->size; 99 } 100 101 gd->ram_size = ram_size; 102 if (ram_size == 0) 103 return -1; 104 105 return 0; 106 } 107 108 void dram_init_banksize(void) 109 { 110 int i, j; 111 112 if (CONFIG_NR_DRAM_BANKS) { 113 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) { 114 struct memrange *memrange = &lib_sysinfo.memrange[i]; 115 116 if (memrange->type == CB_MEM_RAM) { 117 gd->bd->bi_dram[j].start = memrange->base; 118 gd->bd->bi_dram[j].size = memrange->size; 119 j++; 120 if (j >= CONFIG_NR_DRAM_BANKS) 121 break; 122 } 123 } 124 } 125 } 126