2 * support for Multiboot payloads
4 * Copyright (C) 2008 Robert Millan
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include <cpu/x86/multiboot.h>
23 #include <device/resource.h>
24 #include <console/console.h>
26 static struct multiboot_mmap_entry *mb_mem;
27 struct multiboot_info *mbi = NULL;
34 static void build_mb_mem_range_nooverlap(u64 addr, u64 len)
37 for (i = 0; i < sizeof(reserved_mem) / sizeof(reserved_mem[0]); i++) {
38 /* free region fully contained in reserved region, abort */
39 if (addr >= reserved_mem[i].addr && addr + len <= reserved_mem[i].addr + reserved_mem[i].len)
41 /* reserved region splits free region */
42 if (addr < reserved_mem[i].addr && addr + len > reserved_mem[i].addr + reserved_mem[i].len) {
43 build_mb_mem_range_nooverlap(addr, reserved_mem[i].addr - addr);
44 build_mb_mem_range_nooverlap(reserved_mem[i].addr + reserved_mem[i].len, (addr + len) - (reserved_mem[i].addr + reserved_mem[i].len));
48 if (addr < reserved_mem[i].addr + reserved_mem[i].len && addr + len > reserved_mem[i].addr + reserved_mem[i].len) {
50 addr = reserved_mem[i].addr + reserved_mem[i].len;
52 /* len += addr - old_addr */
56 if (addr < reserved_mem[i].addr && addr + len > reserved_mem[i].addr) {
57 len = reserved_mem[i].addr - addr;
60 /* none of the above, just add it */
66 mb_mem->size = sizeof(*mb_mem) - sizeof(mb_mem->size);
70 static void build_mb_mem_range(void *gp, struct device *dev, struct resource *res)
72 build_mb_mem_range_nooverlap(res->base, res->size);
75 #define ROUND(_r,_a) (((_r) + (((_a) - 1))) & ~((_a) - 1))
77 unsigned long write_multiboot_info(
78 unsigned long low_table_start, unsigned long low_table_end,
79 unsigned long rom_table_start, unsigned long rom_table_end)
83 mbi = (struct multiboot_info *)rom_table_end;
85 memset(mbi, 0, sizeof(*mbi));
86 rom_table_end += sizeof(*mbi);
88 mbi->mmap_addr = (u32) rom_table_end;
89 mb_mem = (struct multiboot_mmap_entry *)rom_table_end;
91 /* FIXME This code is broken, it does not know about high memory
92 * tables, nor does it reserve the coreboot table area.
94 /* reserved regions */
95 reserved_mem[0].addr = low_table_start;
96 reserved_mem[0].len = ROUND(low_table_end - low_table_start, 4096);
97 reserved_mem[1].addr = rom_table_start;
98 reserved_mem[1].len = ROUND(rom_table_end - rom_table_start, 4096);
100 for (i = 0; i < sizeof(reserved_mem) / sizeof(reserved_mem[0]); i++) {
101 mb_mem->addr = reserved_mem[i].addr;
102 mb_mem->len = reserved_mem[i].len;
104 mb_mem->size = sizeof(*mb_mem) - sizeof(mb_mem->size);
109 search_global_resources( IORESOURCE_MEM | IORESOURCE_CACHEABLE,
110 IORESOURCE_MEM | IORESOURCE_CACHEABLE, build_mb_mem_range, NULL);
112 mbi->mmap_length = ((u32) mb_mem) - mbi->mmap_addr;
113 mbi->flags |= MB_INFO_MEM_MAP;
115 printk(BIOS_INFO, "Multiboot Information structure has been written.\n");
117 return (unsigned long)mb_mem;