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/*
* support for Multiboot payloads
*
* Copyright (C) 2008 Robert Millan
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include <cpu/x86/multiboot.h>
#include <string.h>
#include <device/resource.h>
#include <console/console.h>
typedef unsigned long long u64;
static struct multiboot_mmap_entry *mb_mem;
struct multiboot_info *mbi;
static struct {
u64 addr;
u64 len;
} reserved_mem[2];
static void build_mb_mem_range_nooverlap(u64 addr, u64 len)
{
int i;
for (i = 0; i < sizeof(reserved_mem) / sizeof(reserved_mem[0]); i++) {
/* free region fully contained in reserved region, abort */
if (addr >= reserved_mem[i].addr && addr + len <= reserved_mem[i].addr + reserved_mem[i].len)
return;
/* reserved region splits free region */
if (addr < reserved_mem[i].addr && addr + len > reserved_mem[i].addr + reserved_mem[i].len) {
build_mb_mem_range_nooverlap(addr, reserved_mem[i].addr - addr);
build_mb_mem_range_nooverlap(reserved_mem[i].addr + reserved_mem[i].len, (addr + len) - (reserved_mem[i].addr + reserved_mem[i].len));
return;
}
/* left overlap */
if (addr < reserved_mem[i].addr + reserved_mem[i].len && addr + len > reserved_mem[i].addr + reserved_mem[i].len) {
len += addr;
addr = reserved_mem[i].addr + reserved_mem[i].len;
len -= addr;
/* len += addr - old_addr */
continue;
}
/* right overlap */
if (addr < reserved_mem[i].addr && addr + len > reserved_mem[i].addr) {
len = reserved_mem[i].addr - addr;
continue;
}
/* none of the above, just add it */
}
mb_mem->addr = addr;
mb_mem->len = len;
mb_mem->type = 1;
mb_mem->size = sizeof(*mb_mem) - sizeof(mb_mem->size);
mb_mem++;
}
static void build_mb_mem_range(void *gp, struct device *dev, struct resource *res)
{
build_mb_mem_range_nooverlap(res->base, res->size);
}
#define ROUND(_r,_a) ((_r) + (((_a) - 1)) & ~((_a) - 1))
unsigned long write_multiboot_info(
unsigned long low_table_start, unsigned long low_table_end,
unsigned long rom_table_start, unsigned long rom_table_end)
{
struct multiboot_info *mbi;
int i;
mbi = rom_table_end;
memset(mbi, 0, sizeof(*mbi));
rom_table_end += sizeof(*mbi);
mbi->mmap_addr = (u32) rom_table_end;
mb_mem = rom_table_end;
/* reserved regions */
reserved_mem[0].addr = low_table_start;
reserved_mem[0].len = ROUND(low_table_end - low_table_start, 4096);
reserved_mem[1].addr = rom_table_start;
reserved_mem[1].len = ROUND(rom_table_end - rom_table_start, 4096);
for (i = 0; i < sizeof(reserved_mem) / sizeof(reserved_mem[0]); i++) {
mb_mem->addr = reserved_mem[i].addr;
mb_mem->len = reserved_mem[i].len;
mb_mem->type = 2;
mb_mem->size = sizeof(*mb_mem) - sizeof(mb_mem->size);
mb_mem++;
}
/* free regions */
search_global_resources( IORESOURCE_MEM | IORESOURCE_CACHEABLE,
IORESOURCE_MEM | IORESOURCE_CACHEABLE, build_mb_mem_range, NULL);
mbi->mmap_length = ((u32) mb_mem) - mbi->mmap_addr;
mbi->flags |= MB_INFO_MEM_MAP;
printk_info("Multiboot Information structure has been written.\n");
return mb_mem;
}
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