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