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: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thierry Escande
Greg Kroah-Hartman
parent
f952a401ac
commit
afe9dba4f9
|
|
@ -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
|
||||
|
|
|
|||
|
|
@ -1,3 +1,4 @@
|
|||
|
||||
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
|
||||
|
|
|
|||
154
drivers/firmware/google/memconsole-x86-legacy.c
Normal file
154
drivers/firmware/google/memconsole-x86-legacy.c
Normal file
|
|
@ -0,0 +1,154 @@
|
|||
/*
|
||||
* 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");
|
||||
|
|
@ -1,66 +1,36 @@
|
|||
/*
|
||||
* 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)
|
||||
void memconsole_setup(void *baseaddr, size_t length)
|
||||
{
|
||||
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;
|
||||
memconsole_baseaddr = baseaddr;
|
||||
memconsole_length = length;
|
||||
}
|
||||
EXPORT_SYMBOL(memconsole_setup);
|
||||
|
||||
static void __init found_v2_header(struct biosmemcon_ebda *hdr)
|
||||
int memconsole_sysfs_init(void)
|
||||
{
|
||||
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)
|
||||
{
|
||||
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;
|
||||
}
|
||||
|
||||
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)
|
||||
{
|
||||
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");
|
||||
|
|
|
|||
43
drivers/firmware/google/memconsole.h
Normal file
43
drivers/firmware/google/memconsole.h
Normal file
|
|
@ -0,0 +1,43 @@
|
|||
/*
|
||||
* 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 */
|
||||
Loading…
Reference in New Issue
Block a user