qemu: Initial support for the qemu firmware config interface.

qemu has a special device to pass configuration information
from qemu to the firmware.  This patch adds initial support
the interface, namely some infrastructure, detection code and
a function to query the number of CPUs.

Change-Id: I43ff5f4fbf12334a91422aa38f514a82a1d5219e
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-on: http://review.coreboot.org/3343
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Gerd Hoffmann 2013-05-30 15:41:48 +02:00 committed by Stefan Reinauer
parent 019f0fc2c7
commit 2b9620343b
4 changed files with 132 additions and 0 deletions

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@ -1,2 +1,3 @@
cpu_incs += $(src)/mainboard/emulation/qemu-x86/cache_as_ram.inc
ramstage-y += northbridge.c
ramstage-y += fw_cfg.c

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/*
* This file is part of the coreboot project.
*
* 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; version 2 of the License.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <console/console.h>
#include <arch/io.h>
#include "fw_cfg.h"
#include "fw_cfg_if.h"
#define FW_CFG_PORT_CTL 0x0510
#define FW_CFG_PORT_DATA 0x0511
static unsigned char fw_cfg_detected = 0xff;
static int fw_cfg_present(void)
{
static const char qsig[] = "QEMU";
unsigned char sig[4];
if (fw_cfg_detected == 0xff) {
fw_cfg_get(FW_CFG_SIGNATURE, sig, sizeof(sig));
fw_cfg_detected = (memcmp(sig, qsig, 4) == 0) ? 1 : 0;
printk(BIOS_INFO, "QEMU: firmware config interface %s\n",
fw_cfg_detected ? "detected" : "not found");
}
return fw_cfg_detected;
}
void fw_cfg_get(int entry, void *dst, int dstlen)
{
outw(entry, FW_CFG_PORT_CTL);
insb(FW_CFG_PORT_DATA, dst, dstlen);
}
int fw_cfg_max_cpus(void)
{
unsigned short max_cpus;
if (!fw_cfg_present())
return -1;
fw_cfg_get(FW_CFG_MAX_CPUS, &max_cpus, sizeof(max_cpus));
return max_cpus;
}

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/*
* This file is part of the coreboot project.
*
* 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; version 2 of the License.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
void fw_cfg_get(int entry, void *dst, int dstlen);
int fw_cfg_max_cpus(void);

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/*
* This are the qemu firmware config interface defines and structs.
* Copyed over from qemu soure tree, include/hw/nvram/fw_cfg.h
*/
#define FW_CFG_SIGNATURE 0x00
#define FW_CFG_ID 0x01
#define FW_CFG_UUID 0x02
#define FW_CFG_RAM_SIZE 0x03
#define FW_CFG_NOGRAPHIC 0x04
#define FW_CFG_NB_CPUS 0x05
#define FW_CFG_MACHINE_ID 0x06
#define FW_CFG_KERNEL_ADDR 0x07
#define FW_CFG_KERNEL_SIZE 0x08
#define FW_CFG_KERNEL_CMDLINE 0x09
#define FW_CFG_INITRD_ADDR 0x0a
#define FW_CFG_INITRD_SIZE 0x0b
#define FW_CFG_BOOT_DEVICE 0x0c
#define FW_CFG_NUMA 0x0d
#define FW_CFG_BOOT_MENU 0x0e
#define FW_CFG_MAX_CPUS 0x0f
#define FW_CFG_KERNEL_ENTRY 0x10
#define FW_CFG_KERNEL_DATA 0x11
#define FW_CFG_INITRD_DATA 0x12
#define FW_CFG_CMDLINE_ADDR 0x13
#define FW_CFG_CMDLINE_SIZE 0x14
#define FW_CFG_CMDLINE_DATA 0x15
#define FW_CFG_SETUP_ADDR 0x16
#define FW_CFG_SETUP_SIZE 0x17
#define FW_CFG_SETUP_DATA 0x18
#define FW_CFG_FILE_DIR 0x19
#define FW_CFG_FILE_FIRST 0x20
#define FW_CFG_FILE_SLOTS 0x10
#define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST+FW_CFG_FILE_SLOTS)
#define FW_CFG_WRITE_CHANNEL 0x4000
#define FW_CFG_ARCH_LOCAL 0x8000
#define FW_CFG_ENTRY_MASK ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
#define FW_CFG_INVALID 0xffff
typedef struct FWCfgFile {
uint32_t size; /* file size */
uint16_t select; /* write this to 0x510 to read it */
uint16_t reserved;
char name[56];
} FWCfgFile;
typedef struct FWCfgFiles {
uint32_t count;
FWCfgFile f[];
} FWCfgFiles;