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>
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cpu_incs += $(src)/mainboard/emulation/qemu-x86/cache_as_ram.inc
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ramstage-y += northbridge.c
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ramstage-y += fw_cfg.c
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/*
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* This file is part of the coreboot project.
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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; version 2 of the License.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include <console/console.h>
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#include <arch/io.h>
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#include "fw_cfg.h"
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#include "fw_cfg_if.h"
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#define FW_CFG_PORT_CTL 0x0510
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#define FW_CFG_PORT_DATA 0x0511
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static unsigned char fw_cfg_detected = 0xff;
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static int fw_cfg_present(void)
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{
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static const char qsig[] = "QEMU";
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unsigned char sig[4];
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if (fw_cfg_detected == 0xff) {
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fw_cfg_get(FW_CFG_SIGNATURE, sig, sizeof(sig));
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fw_cfg_detected = (memcmp(sig, qsig, 4) == 0) ? 1 : 0;
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printk(BIOS_INFO, "QEMU: firmware config interface %s\n",
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fw_cfg_detected ? "detected" : "not found");
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}
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return fw_cfg_detected;
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}
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void fw_cfg_get(int entry, void *dst, int dstlen)
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{
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outw(entry, FW_CFG_PORT_CTL);
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insb(FW_CFG_PORT_DATA, dst, dstlen);
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}
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int fw_cfg_max_cpus(void)
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{
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unsigned short max_cpus;
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if (!fw_cfg_present())
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return -1;
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fw_cfg_get(FW_CFG_MAX_CPUS, &max_cpus, sizeof(max_cpus));
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return max_cpus;
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}
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/*
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* This file is part of the coreboot project.
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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; version 2 of the License.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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void fw_cfg_get(int entry, void *dst, int dstlen);
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int fw_cfg_max_cpus(void);
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/*
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* This are the qemu firmware config interface defines and structs.
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* Copyed over from qemu soure tree, include/hw/nvram/fw_cfg.h
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*/
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#define FW_CFG_SIGNATURE 0x00
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#define FW_CFG_ID 0x01
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#define FW_CFG_UUID 0x02
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#define FW_CFG_RAM_SIZE 0x03
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#define FW_CFG_NOGRAPHIC 0x04
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#define FW_CFG_NB_CPUS 0x05
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#define FW_CFG_MACHINE_ID 0x06
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#define FW_CFG_KERNEL_ADDR 0x07
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#define FW_CFG_KERNEL_SIZE 0x08
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#define FW_CFG_KERNEL_CMDLINE 0x09
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#define FW_CFG_INITRD_ADDR 0x0a
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#define FW_CFG_INITRD_SIZE 0x0b
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#define FW_CFG_BOOT_DEVICE 0x0c
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#define FW_CFG_NUMA 0x0d
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#define FW_CFG_BOOT_MENU 0x0e
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#define FW_CFG_MAX_CPUS 0x0f
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#define FW_CFG_KERNEL_ENTRY 0x10
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#define FW_CFG_KERNEL_DATA 0x11
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#define FW_CFG_INITRD_DATA 0x12
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#define FW_CFG_CMDLINE_ADDR 0x13
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#define FW_CFG_CMDLINE_SIZE 0x14
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#define FW_CFG_CMDLINE_DATA 0x15
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#define FW_CFG_SETUP_ADDR 0x16
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#define FW_CFG_SETUP_SIZE 0x17
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#define FW_CFG_SETUP_DATA 0x18
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#define FW_CFG_FILE_DIR 0x19
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#define FW_CFG_FILE_FIRST 0x20
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#define FW_CFG_FILE_SLOTS 0x10
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#define FW_CFG_MAX_ENTRY (FW_CFG_FILE_FIRST+FW_CFG_FILE_SLOTS)
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#define FW_CFG_WRITE_CHANNEL 0x4000
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#define FW_CFG_ARCH_LOCAL 0x8000
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#define FW_CFG_ENTRY_MASK ~(FW_CFG_WRITE_CHANNEL | FW_CFG_ARCH_LOCAL)
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#define FW_CFG_INVALID 0xffff
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typedef struct FWCfgFile {
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uint32_t size; /* file size */
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uint16_t select; /* write this to 0x510 to read it */
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uint16_t reserved;
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char name[56];
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} FWCfgFile;
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typedef struct FWCfgFiles {
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uint32_t count;
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FWCfgFile f[];
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} FWCfgFiles;
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