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 #include <asm/global_data.h>
10
11 DECLARE_GLOBAL_DATA_PTR;
12
13 /*
14 * Install a default e820 table with 4 entries as follows:
15 *
16 * 0x000000-0x0a0000 Useable RAM
17 * 0x0a0000-0x100000 Reserved for ISA
18 * 0x100000-gd->ram_size Useable RAM
19 * CONFIG_PCIE_ECAM_BASE PCIe ECAM
20 */
install_e820_map(unsigned int max_entries,struct e820_entry * entries)21 __weak unsigned int install_e820_map(unsigned int max_entries,
22 struct e820_entry *entries)
23 {
24 entries[0].addr = 0;
25 entries[0].size = ISA_START_ADDRESS;
26 entries[0].type = E820_RAM;
27 entries[1].addr = ISA_START_ADDRESS;
28 entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
29 entries[1].type = E820_RESERVED;
30 entries[2].addr = ISA_END_ADDRESS;
31 entries[2].size = gd->ram_size - ISA_END_ADDRESS;
32 entries[2].type = E820_RAM;
33 entries[3].addr = CONFIG_PCIE_ECAM_BASE;
34 entries[3].size = CONFIG_PCIE_ECAM_SIZE;
35 entries[3].type = E820_RESERVED;
36
37 return 4;
38 }
39
40 #if CONFIG_IS_ENABLED(EFI_LOADER)
efi_add_known_memory(void)41 void efi_add_known_memory(void)
42 {
43 struct e820_entry e820[E820MAX];
44 unsigned int i, num;
45 u64 start, ram_top;
46 int type;
47
48 num = install_e820_map(ARRAY_SIZE(e820), e820);
49
50 ram_top = (u64)gd->ram_top & ~EFI_PAGE_MASK;
51 if (!ram_top)
52 ram_top = 0x100000000ULL;
53
54 for (i = 0; i < num; ++i) {
55 start = e820[i].addr;
56
57 switch (e820[i].type) {
58 case E820_RAM:
59 type = EFI_CONVENTIONAL_MEMORY;
60 break;
61 case E820_RESERVED:
62 type = EFI_RESERVED_MEMORY_TYPE;
63 break;
64 case E820_ACPI:
65 type = EFI_ACPI_RECLAIM_MEMORY;
66 break;
67 case E820_NVS:
68 type = EFI_ACPI_MEMORY_NVS;
69 break;
70 case E820_UNUSABLE:
71 default:
72 type = EFI_UNUSABLE_MEMORY;
73 break;
74 }
75
76 if (type == EFI_CONVENTIONAL_MEMORY) {
77 efi_add_conventional_memory_map(start,
78 start + e820[i].size,
79 ram_top);
80 } else {
81 efi_add_memory_map(start, e820[i].size, type);
82 }
83 }
84 }
85 #endif /* CONFIG_IS_ENABLED(EFI_LOADER) */
86