1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Support for booting from coreboot
4  *
5  * Copyright 2021 Google LLC
6  */
7 
8 #include <common.h>
9 #include <asm/cb_sysinfo.h>
10 #include <asm/e820.h>
11 
cb_install_e820_map(unsigned int max_entries,struct e820_entry * entries)12 unsigned int cb_install_e820_map(unsigned int max_entries,
13 				 struct e820_entry *entries)
14 {
15 	unsigned int num_entries;
16 	int i;
17 
18 	num_entries = min((unsigned int)lib_sysinfo.n_memranges, max_entries);
19 	if (num_entries < lib_sysinfo.n_memranges) {
20 		printf("Warning: Limiting e820 map to %d entries\n",
21 		       num_entries);
22 	}
23 	for (i = 0; i < num_entries; i++) {
24 		struct memrange *memrange = &lib_sysinfo.memrange[i];
25 
26 		entries[i].addr = memrange->base;
27 		entries[i].size = memrange->size;
28 
29 		/*
30 		 * coreboot has some extensions (type 6 & 16) to the E820 types.
31 		 * When we detect this, mark it as E820_RESERVED.
32 		 */
33 		if (memrange->type == CB_MEM_VENDOR_RSVD ||
34 		    memrange->type == CB_MEM_TABLE)
35 			entries[i].type = E820_RESERVED;
36 		else
37 			entries[i].type = memrange->type;
38 	}
39 
40 	return num_entries;
41 }
42