xref: /openbmc/u-boot/arch/x86/lib/e820.c (revision 3ebd892f)
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 <asm/e820.h>
8 
9 DECLARE_GLOBAL_DATA_PTR;
10 
11 /*
12  * Install a default e820 table with 4 entries as follows:
13  *
14  *	0x000000-0x0a0000	Useable RAM
15  *	0x0a0000-0x100000	Reserved for ISA
16  *	0x100000-gd->ram_size	Useable RAM
17  *	CONFIG_PCIE_ECAM_BASE	PCIe ECAM
18  */
19 __weak unsigned int install_e820_map(unsigned int max_entries,
20 				     struct e820_entry *entries)
21 {
22 	entries[0].addr = 0;
23 	entries[0].size = ISA_START_ADDRESS;
24 	entries[0].type = E820_RAM;
25 	entries[1].addr = ISA_START_ADDRESS;
26 	entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS;
27 	entries[1].type = E820_RESERVED;
28 	entries[2].addr = ISA_END_ADDRESS;
29 	entries[2].size = gd->ram_size - ISA_END_ADDRESS;
30 	entries[2].type = E820_RAM;
31 	entries[3].addr = CONFIG_PCIE_ECAM_BASE;
32 	entries[3].size = CONFIG_PCIE_ECAM_SIZE;
33 	entries[3].type = E820_RESERVED;
34 
35 	return 4;
36 }
37