mirror of
https://github.com/fail0verflow/switch-coreboot.git
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84b3e13596
Signed-off-by: Myles Watson <mylesgw@gmail.com> Acked-by: Ronald G. Minnich <rminnich@gmail.com> git-svn-id: svn://coreboot.org/repository/coreboot-v3@949 f3766cd6-281f-0410-b1cd-43a5c92072e9
111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/*
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* support for Multiboot payloads
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*
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* Copyright (C) 2008 Robert Millan
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <multiboot.h>
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#include <string.h>
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#include <device/resource.h>
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#include <console.h>
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static struct multiboot_mmap_entry *mb_mem;
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static struct {
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u64 addr;
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u64 len;
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} reserved_mem[2];
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static void build_mb_mem_range_nooverlap(u64 addr, u64 len)
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{
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int i;
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for (i = 0; i < sizeof(reserved_mem) / sizeof(reserved_mem[0]); i++) {
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/* free region fully contained in reserved region, abort */
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if (addr >= reserved_mem[i].addr && addr + len <= reserved_mem[i].addr + reserved_mem[i].len)
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return;
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/* reserved region splits free region */
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if (addr < reserved_mem[i].addr && addr + len > reserved_mem[i].addr + reserved_mem[i].len) {
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build_mb_mem_range_nooverlap(addr, reserved_mem[i].addr - addr);
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build_mb_mem_range_nooverlap(reserved_mem[i].addr + reserved_mem[i].len, (addr + len) - (reserved_mem[i].addr + reserved_mem[i].len));
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return;
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}
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/* left overlap */
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if (addr < reserved_mem[i].addr + reserved_mem[i].len && addr + len > reserved_mem[i].addr + reserved_mem[i].len) {
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len += addr;
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addr = reserved_mem[i].addr + reserved_mem[i].len;
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len -= addr;
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/* len += addr - old_addr */
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continue;
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}
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/* right overlap */
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if (addr < reserved_mem[i].addr && addr + len > reserved_mem[i].addr) {
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len = reserved_mem[i].addr - addr;
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continue;
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}
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/* none of the above, just add it */
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}
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mb_mem->addr = addr;
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mb_mem->len = len;
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mb_mem->type = 1;
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mb_mem->size = sizeof(*mb_mem) - sizeof(mb_mem->size);
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mb_mem++;
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}
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static void build_mb_mem_range(void *gp, struct device *dev, struct resource *res)
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{
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build_mb_mem_range_nooverlap(res->base, res->size);
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}
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unsigned long write_multiboot_info(
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unsigned long low_table_start, unsigned long low_table_end,
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unsigned long rom_table_start, unsigned long rom_table_end)
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{
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struct multiboot_info *mbi;
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int i;
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mbi = (void*)rom_table_end;
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memset(mbi, 0, sizeof(*mbi));
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rom_table_end += sizeof(*mbi);
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mbi->mmap_addr = (u32) rom_table_end;
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mb_mem = (struct multiboot_mmap_entry*)rom_table_end;
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/* reserved regions */
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reserved_mem[0].addr = low_table_start;
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reserved_mem[0].len = low_table_end - low_table_start;
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reserved_mem[1].addr = rom_table_start;
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reserved_mem[1].len = rom_table_end - rom_table_start;
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for (i = 0; i < sizeof(reserved_mem) / sizeof(reserved_mem[0]); i++) {
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mb_mem->addr = reserved_mem[i].addr;
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mb_mem->len = reserved_mem[i].len;
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mb_mem->type = 2;
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mb_mem->size = sizeof(*mb_mem) - sizeof(mb_mem->size);
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mb_mem++;
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}
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/* free regions */
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search_global_resources( IORESOURCE_MEM | IORESOURCE_CACHEABLE,
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IORESOURCE_MEM | IORESOURCE_CACHEABLE, build_mb_mem_range, NULL);
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mbi->mmap_length = ((u32) mb_mem) - mbi->mmap_addr;
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mbi->flags |= MB_INFO_MEM_MAP;
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printk(BIOS_INFO, "Multiboot Information structure has been written.\n");
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return (unsigned long)mb_mem;
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}
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