1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
4 */
5
6 #include <common.h>
7 #include <efi_loader.h>
8 #include <asm/e820.h>
9
10 DECLARE_GLOBAL_DATA_PTR;
11
12 /*
13 * Install a default e820 table with 4 entries as follows:
14 *
15 * 0x000000-0x0a0000 Useable RAM
16 * 0x0a0000-0x100000 Reserved for ISA
17 * 0x100000-gd->ram_size Useable RAM
18 * CONFIG_PCIE_ECAM_BASE PCIe ECAM
19 */
install_e820_map(unsigned int max_entries,struct e820_entry * entries)20 __weak unsigned int install_e820_map(unsigned int max_entries,
21 struct e820_entry *entries)
22 {
23 entries[0].addr = 0;
24 entries[0].size = ISA_START_ADDRESS;
25 entries[0].type = E820_RAM;
26 entries[1].addr = ISA_START_ADDRESS;
27 entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
28 entries[1].type = E820_RESERVED;
29 entries[2].addr = ISA_END_ADDRESS;
30 entries[2].size = gd->ram_size - ISA_END_ADDRESS;
31 entries[2].type = E820_RAM;
32 entries[3].addr = CONFIG_PCIE_ECAM_BASE;
33 entries[3].size = CONFIG_PCIE_ECAM_SIZE;
34 entries[3].type = E820_RESERVED;
35
36 return 4;
37 }
38
39 #if CONFIG_IS_ENABLED(EFI_LOADER)
efi_add_known_memory(void)40 void efi_add_known_memory(void)
41 {
42 struct e820_entry e820[E820MAX];
43 unsigned int i, num;
44 u64 start, pages;
45 int type;
46
47 num = install_e820_map(ARRAY_SIZE(e820), e820);
48
49 for (i = 0; i < num; ++i) {
50 start = e820[i].addr;
51 pages = ALIGN(e820[i].size, EFI_PAGE_SIZE) >> EFI_PAGE_SHIFT;
52
53 switch (e820[i].type) {
54 case E820_RAM:
55 type = EFI_CONVENTIONAL_MEMORY;
56 break;
57 case E820_RESERVED:
58 type = EFI_RESERVED_MEMORY_TYPE;
59 break;
60 case E820_ACPI:
61 type = EFI_ACPI_RECLAIM_MEMORY;
62 break;
63 case E820_NVS:
64 type = EFI_ACPI_MEMORY_NVS;
65 break;
66 case E820_UNUSABLE:
67 default:
68 type = EFI_UNUSABLE_MEMORY;
69 break;
70 }
71
72 efi_add_memory_map(start, pages, type, false);
73 }
74 }
75 #endif /* CONFIG_IS_ENABLED(EFI_LOADER) */
76