1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (c) 2011 The Chromium OS Authors. 4 * (C) Copyright 2010,2011 5 * Graeme Russ, <graeme.russ@gmail.com> 6 */ 7 8 #include <common.h> 9 #include <asm/e820.h> 10 #include <asm/arch/sysinfo.h> 11 12 DECLARE_GLOBAL_DATA_PTR; 13 14 unsigned int install_e820_map(unsigned int max_entries, 15 struct e820_entry *entries) 16 { 17 unsigned int num_entries; 18 int i; 19 20 num_entries = min((unsigned int)lib_sysinfo.n_memranges, max_entries); 21 if (num_entries < lib_sysinfo.n_memranges) { 22 printf("Warning: Limiting e820 map to %d entries.\n", 23 num_entries); 24 } 25 for (i = 0; i < num_entries; i++) { 26 struct memrange *memrange = &lib_sysinfo.memrange[i]; 27 28 entries[i].addr = memrange->base; 29 entries[i].size = memrange->size; 30 31 /* 32 * coreboot has some extensions (type 6 & 16) to the E820 types. 33 * When we detect this, mark it as E820_RESERVED. 34 */ 35 if (memrange->type == CB_MEM_VENDOR_RSVD || 36 memrange->type == CB_MEM_TABLE) 37 entries[i].type = E820_RESERVED; 38 else 39 entries[i].type = memrange->type; 40 } 41 42 return num_entries; 43 } 44 45 /* 46 * This function looks for the highest region of memory lower than 4GB which 47 * has enough space for U-Boot where U-Boot is aligned on a page boundary. It 48 * overrides the default implementation found elsewhere which simply picks the 49 * end of ram, wherever that may be. The location of the stack, the relocation 50 * address, and how far U-Boot is moved by relocation are set in the global 51 * data structure. 52 */ 53 ulong board_get_usable_ram_top(ulong total_size) 54 { 55 uintptr_t dest_addr = 0; 56 int i; 57 58 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 59 struct memrange *memrange = &lib_sysinfo.memrange[i]; 60 /* Force U-Boot to relocate to a page aligned address. */ 61 uint64_t start = roundup(memrange->base, 1 << 12); 62 uint64_t end = memrange->base + memrange->size; 63 64 /* Ignore non-memory regions. */ 65 if (memrange->type != CB_MEM_RAM) 66 continue; 67 68 /* Filter memory over 4GB. */ 69 if (end > 0xffffffffULL) 70 end = 0x100000000ULL; 71 /* Skip this region if it's too small. */ 72 if (end - start < total_size) 73 continue; 74 75 /* Use this address if it's the largest so far. */ 76 if (end > dest_addr) 77 dest_addr = end; 78 } 79 80 /* If no suitable area was found, return an error. */ 81 if (!dest_addr) 82 panic("No available memory found for relocation"); 83 84 return (ulong)dest_addr; 85 } 86 87 int dram_init(void) 88 { 89 int i; 90 phys_size_t ram_size = 0; 91 92 for (i = 0; i < lib_sysinfo.n_memranges; i++) { 93 struct memrange *memrange = &lib_sysinfo.memrange[i]; 94 unsigned long long end = memrange->base + memrange->size; 95 96 if (memrange->type == CB_MEM_RAM && end > ram_size) 97 ram_size += memrange->size; 98 } 99 100 gd->ram_size = ram_size; 101 if (ram_size == 0) 102 return -1; 103 104 return 0; 105 } 106 107 int dram_init_banksize(void) 108 { 109 int i, j; 110 111 if (CONFIG_NR_DRAM_BANKS) { 112 for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) { 113 struct memrange *memrange = &lib_sysinfo.memrange[i]; 114 115 if (memrange->type == CB_MEM_RAM) { 116 gd->bd->bi_dram[j].start = memrange->base; 117 gd->bd->bi_dram[j].size = memrange->size; 118 j++; 119 if (j >= CONFIG_NR_DRAM_BANKS) 120 break; 121 } 122 } 123 } 124 125 return 0; 126 } 127