Commit afe9dba4 authored by Thierry Escande's avatar Thierry Escande Committed by Greg Kroah-Hartman

firmware: google memconsole: Move specific EBDA parts

This patch splits memconsole.c in 2 parts. One containing the
architecture-independent part and the other one containing the EBDA
specific part. This prepares the integration of coreboot support for the
memconsole.

The memconsole driver is now named as memconsole-x86-legacy.
Signed-off-by: default avatarThierry Escande <thierry.escande@collabora.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f952a401
......@@ -20,8 +20,13 @@ config GOOGLE_SMI
variables.
config GOOGLE_MEMCONSOLE
tristate "Firmware Memory Console"
depends on DMI
tristate
depends on GOOGLE_MEMCONSOLE_X86_LEGACY
config GOOGLE_MEMCONSOLE_X86_LEGACY
tristate "Firmware Memory Console - X86 Legacy support"
depends on X86 && ACPI && DMI
select GOOGLE_MEMCONSOLE
help
This option enables the kernel to search for a firmware log in
the EBDA on Google servers. If found, this log is exported to
......
obj-$(CONFIG_GOOGLE_SMI) += gsmi.o
obj-$(CONFIG_GOOGLE_MEMCONSOLE) += memconsole.o
obj-$(CONFIG_GOOGLE_MEMCONSOLE) += memconsole.o
obj-$(CONFIG_GOOGLE_MEMCONSOLE_X86_LEGACY) += memconsole-x86-legacy.o
/*
* memconsole-x86-legacy.c
*
* EBDA specific parts of the memory based BIOS console.
*
* Copyright 2017 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2.0 as published by
* the Free Software Foundation.
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/mm.h>
#include <asm/bios_ebda.h>
#include <asm/e820.h>
#include <linux/acpi.h>
#include "memconsole.h"
#define BIOS_MEMCONSOLE_V1_MAGIC 0xDEADBABE
#define BIOS_MEMCONSOLE_V2_MAGIC (('M')|('C'<<8)|('O'<<16)|('N'<<24))
struct biosmemcon_ebda {
u32 signature;
union {
struct {
u8 enabled;
u32 buffer_addr;
u16 start;
u16 end;
u16 num_chars;
u8 wrapped;
} __packed v1;
struct {
u32 buffer_addr;
/* Misdocumented as number of pages! */
u16 num_bytes;
u16 start;
u16 end;
} __packed v2;
};
} __packed;
static void found_v1_header(struct biosmemcon_ebda *hdr)
{
pr_info("memconsole: BIOS console v1 EBDA structure found at %p\n",
hdr);
pr_info("memconsole: BIOS console buffer at 0x%.8x, start = %d, end = %d, num = %d\n",
hdr->v1.buffer_addr, hdr->v1.start,
hdr->v1.end, hdr->v1.num_chars);
memconsole_setup(phys_to_virt(hdr->v1.buffer_addr), hdr->v1.num_chars);
}
static void found_v2_header(struct biosmemcon_ebda *hdr)
{
pr_info("memconsole: BIOS console v2 EBDA structure found at %p\n",
hdr);
pr_info("memconsole: BIOS console buffer at 0x%.8x, start = %d, end = %d, num_bytes = %d\n",
hdr->v2.buffer_addr, hdr->v2.start,
hdr->v2.end, hdr->v2.num_bytes);
memconsole_setup(phys_to_virt(hdr->v2.buffer_addr + hdr->v2.start),
hdr->v2.end - hdr->v2.start);
}
/*
* Search through the EBDA for the BIOS Memory Console, and
* set the global variables to point to it. Return true if found.
*/
static bool memconsole_ebda_init(void)
{
unsigned int address;
size_t length, cur;
address = get_bios_ebda();
if (!address) {
pr_info("memconsole: BIOS EBDA non-existent.\n");
return false;
}
/* EBDA length is byte 0 of EBDA (in KB) */
length = *(u8 *)phys_to_virt(address);
length <<= 10; /* convert to bytes */
/*
* Search through EBDA for BIOS memory console structure
* note: signature is not necessarily dword-aligned
*/
for (cur = 0; cur < length; cur++) {
struct biosmemcon_ebda *hdr = phys_to_virt(address + cur);
/* memconsole v1 */
if (hdr->signature == BIOS_MEMCONSOLE_V1_MAGIC) {
found_v1_header(hdr);
return true;
}
/* memconsole v2 */
if (hdr->signature == BIOS_MEMCONSOLE_V2_MAGIC) {
found_v2_header(hdr);
return true;
}
}
pr_info("memconsole: BIOS console EBDA structure not found!\n");
return false;
}
static struct dmi_system_id memconsole_dmi_table[] __initdata = {
{
.ident = "Google Board",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Google, Inc."),
},
},
{}
};
MODULE_DEVICE_TABLE(dmi, memconsole_dmi_table);
static bool __init memconsole_find(void)
{
if (!dmi_check_system(memconsole_dmi_table))
return false;
return memconsole_ebda_init();
}
static int __init memconsole_x86_init(void)
{
if (!memconsole_find())
return -ENODEV;
return memconsole_sysfs_init();
}
static void __exit memconsole_x86_exit(void)
{
memconsole_exit();
}
module_init(memconsole_x86_init);
module_exit(memconsole_x86_exit);
MODULE_AUTHOR("Google, Inc.");
MODULE_LICENSE("GPL");
/*
* memconsole.c
*
* Infrastructure for importing the BIOS memory based console
* into the kernel log ringbuffer.
* Architecture-independent parts of the memory based BIOS console.
*
* Copyright 2010 Google Inc. All rights reserved.
* Copyright 2017 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2.0 as published by
* the Free Software Foundation.
*
* 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.
*/
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/io.h>
#include <asm/bios_ebda.h>
#define BIOS_MEMCONSOLE_V1_MAGIC 0xDEADBABE
#define BIOS_MEMCONSOLE_V2_MAGIC (('M')|('C'<<8)|('O'<<16)|('N'<<24))
#include "memconsole.h"
struct biosmemcon_ebda {
u32 signature;
union {
struct {
u8 enabled;
u32 buffer_addr;
u16 start;
u16 end;
u16 num_chars;
u8 wrapped;
} __packed v1;
struct {
u32 buffer_addr;
/* Misdocumented as number of pages! */
u16 num_bytes;
u16 start;
u16 end;
} __packed v2;
};
} __packed;
static u32 memconsole_baseaddr;
static char *memconsole_baseaddr;
static size_t memconsole_length;
static ssize_t memconsole_read(struct file *filp, struct kobject *kobp,
struct bin_attribute *bin_attr, char *buf,
loff_t pos, size_t count)
{
char *memconsole;
ssize_t ret;
memconsole = ioremap_cache(memconsole_baseaddr, memconsole_length);
if (!memconsole) {
pr_err("memconsole: ioremap_cache failed\n");
return -ENOMEM;
}
ret = memory_read_from_buffer(buf, count, &pos, memconsole,
memconsole_length);
iounmap(memconsole);
return ret;
return memory_read_from_buffer(buf, count, &pos, memconsole_baseaddr,
memconsole_length);
}
static struct bin_attribute memconsole_bin_attr = {
......@@ -68,104 +38,25 @@ static struct bin_attribute memconsole_bin_attr = {
.read = memconsole_read,
};
static void __init found_v1_header(struct biosmemcon_ebda *hdr)
{
pr_info("BIOS console v1 EBDA structure found at %p\n", hdr);
pr_info("BIOS console buffer at 0x%.8x, "
"start = %d, end = %d, num = %d\n",
hdr->v1.buffer_addr, hdr->v1.start,
hdr->v1.end, hdr->v1.num_chars);
memconsole_length = hdr->v1.num_chars;
memconsole_baseaddr = hdr->v1.buffer_addr;
}
static void __init found_v2_header(struct biosmemcon_ebda *hdr)
{
pr_info("BIOS console v2 EBDA structure found at %p\n", hdr);
pr_info("BIOS console buffer at 0x%.8x, "
"start = %d, end = %d, num_bytes = %d\n",
hdr->v2.buffer_addr, hdr->v2.start,
hdr->v2.end, hdr->v2.num_bytes);
memconsole_length = hdr->v2.end - hdr->v2.start;
memconsole_baseaddr = hdr->v2.buffer_addr + hdr->v2.start;
}
/*
* Search through the EBDA for the BIOS Memory Console, and
* set the global variables to point to it. Return true if found.
*/
static bool __init found_memconsole(void)
void memconsole_setup(void *baseaddr, size_t length)
{
unsigned int address;
size_t length, cur;
address = get_bios_ebda();
if (!address) {
pr_info("BIOS EBDA non-existent.\n");
return false;
}
/* EBDA length is byte 0 of EBDA (in KB) */
length = *(u8 *)phys_to_virt(address);
length <<= 10; /* convert to bytes */
/*
* Search through EBDA for BIOS memory console structure
* note: signature is not necessarily dword-aligned
*/
for (cur = 0; cur < length; cur++) {
struct biosmemcon_ebda *hdr = phys_to_virt(address + cur);
/* memconsole v1 */
if (hdr->signature == BIOS_MEMCONSOLE_V1_MAGIC) {
found_v1_header(hdr);
return true;
}
/* memconsole v2 */
if (hdr->signature == BIOS_MEMCONSOLE_V2_MAGIC) {
found_v2_header(hdr);
return true;
}
}
pr_info("BIOS console EBDA structure not found!\n");
return false;
memconsole_baseaddr = baseaddr;
memconsole_length = length;
}
EXPORT_SYMBOL(memconsole_setup);
static struct dmi_system_id memconsole_dmi_table[] __initdata = {
{
.ident = "Google Board",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Google, Inc."),
},
},
{}
};
MODULE_DEVICE_TABLE(dmi, memconsole_dmi_table);
static int __init memconsole_init(void)
int memconsole_sysfs_init(void)
{
if (!dmi_check_system(memconsole_dmi_table))
return -ENODEV;
if (!found_memconsole())
return -ENODEV;
memconsole_bin_attr.size = memconsole_length;
return sysfs_create_bin_file(firmware_kobj, &memconsole_bin_attr);
}
EXPORT_SYMBOL(memconsole_sysfs_init);
static void __exit memconsole_exit(void)
void memconsole_exit(void)
{
sysfs_remove_bin_file(firmware_kobj, &memconsole_bin_attr);
}
module_init(memconsole_init);
module_exit(memconsole_exit);
EXPORT_SYMBOL(memconsole_exit);
MODULE_AUTHOR("Google, Inc.");
MODULE_LICENSE("GPL");
/*
* memconsole.h
*
* Internal headers of the memory based BIOS console.
*
* Copyright 2017 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2.0 as published by
* the Free Software Foundation.
*
* 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.
*/
#ifndef __FIRMWARE_GOOGLE_MEMCONSOLE_H
#define __FIRMWARE_GOOGLE_MEMCONSOLE_H
/*
* memconsole_setup
*
* Initialize the memory console from raw (virtual) base
* address and length.
*/
void memconsole_setup(void *baseaddr, size_t length);
/*
* memconsole_sysfs_init
*
* Update memory console length and create binary file
* for firmware object.
*/
int memconsole_sysfs_init(void);
/* memconsole_exit
*
* Unmap the console buffer.
*/
void memconsole_exit(void);
#endif /* __FIRMWARE_GOOGLE_MEMCONSOLE_H */
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