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/*
* sfi.c - driver for parsing sfi mmap table and build e820 table
*
* Copyright (c) 2009, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "types.h"
#include "bootparam.h"
#include "bootstub.h"
#include "spi-uart.h"
#include "sfi.h"
#define SFI_BASE_ADDR 0x000E0000
#define SFI_LENGTH 0x00020000
static unsigned long sfi_search_mmap(unsigned long start, int len)
{
unsigned long i = 0;
char *pchar = (char *)start;
for (i = 0; i < len; i++, pchar++) {
if (pchar[0] == 'M'
&& pchar[1] == 'M'
&& pchar[2] == 'A'
&& pchar[3] == 'P')
return start + i;
}
return 0;
}
void sfi_setup_e820(struct boot_params *bp)
{
struct sfi_table *sb;
struct sfi_mem_entry *mentry;
unsigned long long start, end, size;
int i, num, type, total;
bp->e820_entries = 0;
total = 0;
/* search for sfi mmap table */
sb = (struct sfi_table *)sfi_search_mmap(SFI_BASE_ADDR, SFI_LENGTH);
if (!sb) {
bs_printk("Bootstub: failed to locate SFI MMAP table\n");
return;
}
bs_printk("Bootstub: will use sfi mmap table for e820 table\n");
num = SFI_GET_ENTRY_NUM(sb, sfi_mem_entry);
mentry = (struct sfi_mem_entry *)sb->pentry;
for (i = 0; i < num; i++) {
start = mentry->phy_start;
size = mentry->pages << 12;
end = start + size;
if (start > end)
continue;
/* translate SFI mmap type to E820 map type */
switch (mentry->type) {
case SFI_MEM_CONV:
type = E820_RAM;
break;
case SFI_MEM_UNUSABLE:
case SFI_RUNTIME_SERVICE_DATA:
mentry++;
continue;
default:
type = E820_RESERVED;
}
if (total == E820MAX)
break;
bp->e820_map[total].addr = start;
bp->e820_map[total].size = size;
bp->e820_map[total++].type = type;
mentry++;
}
bp->e820_entries = total;
}
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