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
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@ -20,8 +20,13 @@ config GOOGLE_SMI
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variables.
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config GOOGLE_MEMCONSOLE
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tristate "Firmware Memory Console"
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depends on DMI
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tristate
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depends on GOOGLE_MEMCONSOLE_X86_LEGACY
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config GOOGLE_MEMCONSOLE_X86_LEGACY
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tristate "Firmware Memory Console - X86 Legacy support"
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depends on X86 && ACPI && DMI
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select GOOGLE_MEMCONSOLE
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help
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This option enables the kernel to search for a firmware log in
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the EBDA on Google servers. If found, this log is exported to
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@ -1,3 +1,4 @@
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obj-$(CONFIG_GOOGLE_SMI) += gsmi.o
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obj-$(CONFIG_GOOGLE_MEMCONSOLE) += memconsole.o
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obj-$(CONFIG_GOOGLE_MEMCONSOLE) += memconsole.o
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obj-$(CONFIG_GOOGLE_MEMCONSOLE_X86_LEGACY) += memconsole-x86-legacy.o
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@ -0,0 +1,154 @@
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/*
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* memconsole-x86-legacy.c
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*
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* EBDA specific parts of the memory based BIOS console.
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*
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* Copyright 2017 Google Inc.
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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 v2.0 as published by
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* the Free Software Foundation.
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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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/dmi.h>
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#include <linux/mm.h>
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#include <asm/bios_ebda.h>
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#include <asm/e820.h>
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#include <linux/acpi.h>
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#include "memconsole.h"
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#define BIOS_MEMCONSOLE_V1_MAGIC 0xDEADBABE
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#define BIOS_MEMCONSOLE_V2_MAGIC (('M')|('C'<<8)|('O'<<16)|('N'<<24))
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struct biosmemcon_ebda {
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u32 signature;
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union {
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struct {
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u8 enabled;
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u32 buffer_addr;
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u16 start;
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u16 end;
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u16 num_chars;
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u8 wrapped;
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} __packed v1;
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struct {
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u32 buffer_addr;
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/* Misdocumented as number of pages! */
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u16 num_bytes;
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u16 start;
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u16 end;
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} __packed v2;
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};
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} __packed;
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static void found_v1_header(struct biosmemcon_ebda *hdr)
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{
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pr_info("memconsole: BIOS console v1 EBDA structure found at %p\n",
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hdr);
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pr_info("memconsole: BIOS console buffer at 0x%.8x, start = %d, end = %d, num = %d\n",
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hdr->v1.buffer_addr, hdr->v1.start,
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hdr->v1.end, hdr->v1.num_chars);
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memconsole_setup(phys_to_virt(hdr->v1.buffer_addr), hdr->v1.num_chars);
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}
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static void found_v2_header(struct biosmemcon_ebda *hdr)
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{
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pr_info("memconsole: BIOS console v2 EBDA structure found at %p\n",
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hdr);
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pr_info("memconsole: BIOS console buffer at 0x%.8x, start = %d, end = %d, num_bytes = %d\n",
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hdr->v2.buffer_addr, hdr->v2.start,
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hdr->v2.end, hdr->v2.num_bytes);
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memconsole_setup(phys_to_virt(hdr->v2.buffer_addr + hdr->v2.start),
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hdr->v2.end - hdr->v2.start);
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}
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/*
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* Search through the EBDA for the BIOS Memory Console, and
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* set the global variables to point to it. Return true if found.
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*/
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static bool memconsole_ebda_init(void)
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{
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unsigned int address;
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size_t length, cur;
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address = get_bios_ebda();
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if (!address) {
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pr_info("memconsole: BIOS EBDA non-existent.\n");
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return false;
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}
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/* EBDA length is byte 0 of EBDA (in KB) */
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length = *(u8 *)phys_to_virt(address);
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length <<= 10; /* convert to bytes */
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/*
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* Search through EBDA for BIOS memory console structure
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* note: signature is not necessarily dword-aligned
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*/
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for (cur = 0; cur < length; cur++) {
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struct biosmemcon_ebda *hdr = phys_to_virt(address + cur);
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/* memconsole v1 */
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if (hdr->signature == BIOS_MEMCONSOLE_V1_MAGIC) {
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found_v1_header(hdr);
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return true;
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}
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/* memconsole v2 */
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if (hdr->signature == BIOS_MEMCONSOLE_V2_MAGIC) {
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found_v2_header(hdr);
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return true;
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}
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}
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pr_info("memconsole: BIOS console EBDA structure not found!\n");
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return false;
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}
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static struct dmi_system_id memconsole_dmi_table[] __initdata = {
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{
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.ident = "Google Board",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Google, Inc."),
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},
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},
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{}
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};
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MODULE_DEVICE_TABLE(dmi, memconsole_dmi_table);
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static bool __init memconsole_find(void)
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{
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if (!dmi_check_system(memconsole_dmi_table))
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return false;
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return memconsole_ebda_init();
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}
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static int __init memconsole_x86_init(void)
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{
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if (!memconsole_find())
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return -ENODEV;
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return memconsole_sysfs_init();
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}
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static void __exit memconsole_x86_exit(void)
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{
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memconsole_exit();
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}
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module_init(memconsole_x86_init);
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module_exit(memconsole_x86_exit);
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MODULE_AUTHOR("Google, Inc.");
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MODULE_LICENSE("GPL");
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@ -1,66 +1,36 @@
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/*
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* memconsole.c
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*
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* Infrastructure for importing the BIOS memory based console
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* into the kernel log ringbuffer.
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* Architecture-independent parts of the memory based BIOS console.
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*
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* Copyright 2010 Google Inc. All rights reserved.
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* Copyright 2017 Google Inc.
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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 v2.0 as published by
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* the Free Software Foundation.
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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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#include <linux/ctype.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include <linux/kobject.h>
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#include <linux/module.h>
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#include <linux/dmi.h>
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#include <linux/io.h>
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#include <asm/bios_ebda.h>
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#define BIOS_MEMCONSOLE_V1_MAGIC 0xDEADBABE
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#define BIOS_MEMCONSOLE_V2_MAGIC (('M')|('C'<<8)|('O'<<16)|('N'<<24))
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#include "memconsole.h"
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struct biosmemcon_ebda {
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u32 signature;
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union {
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struct {
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u8 enabled;
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u32 buffer_addr;
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u16 start;
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u16 end;
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u16 num_chars;
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u8 wrapped;
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} __packed v1;
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struct {
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u32 buffer_addr;
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/* Misdocumented as number of pages! */
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u16 num_bytes;
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u16 start;
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u16 end;
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} __packed v2;
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};
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} __packed;
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static u32 memconsole_baseaddr;
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static char *memconsole_baseaddr;
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static size_t memconsole_length;
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static ssize_t memconsole_read(struct file *filp, struct kobject *kobp,
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struct bin_attribute *bin_attr, char *buf,
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loff_t pos, size_t count)
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{
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char *memconsole;
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ssize_t ret;
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memconsole = ioremap_cache(memconsole_baseaddr, memconsole_length);
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if (!memconsole) {
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pr_err("memconsole: ioremap_cache failed\n");
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return -ENOMEM;
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}
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ret = memory_read_from_buffer(buf, count, &pos, memconsole,
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memconsole_length);
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iounmap(memconsole);
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return ret;
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return memory_read_from_buffer(buf, count, &pos, memconsole_baseaddr,
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memconsole_length);
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}
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static struct bin_attribute memconsole_bin_attr = {
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@ -68,104 +38,25 @@ static struct bin_attribute memconsole_bin_attr = {
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.read = memconsole_read,
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};
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static void __init found_v1_header(struct biosmemcon_ebda *hdr)
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void memconsole_setup(void *baseaddr, size_t length)
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{
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pr_info("BIOS console v1 EBDA structure found at %p\n", hdr);
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pr_info("BIOS console buffer at 0x%.8x, "
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"start = %d, end = %d, num = %d\n",
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hdr->v1.buffer_addr, hdr->v1.start,
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hdr->v1.end, hdr->v1.num_chars);
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memconsole_length = hdr->v1.num_chars;
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memconsole_baseaddr = hdr->v1.buffer_addr;
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memconsole_baseaddr = baseaddr;
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memconsole_length = length;
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}
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EXPORT_SYMBOL(memconsole_setup);
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static void __init found_v2_header(struct biosmemcon_ebda *hdr)
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int memconsole_sysfs_init(void)
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{
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pr_info("BIOS console v2 EBDA structure found at %p\n", hdr);
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pr_info("BIOS console buffer at 0x%.8x, "
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"start = %d, end = %d, num_bytes = %d\n",
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hdr->v2.buffer_addr, hdr->v2.start,
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hdr->v2.end, hdr->v2.num_bytes);
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memconsole_length = hdr->v2.end - hdr->v2.start;
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memconsole_baseaddr = hdr->v2.buffer_addr + hdr->v2.start;
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}
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/*
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* Search through the EBDA for the BIOS Memory Console, and
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* set the global variables to point to it. Return true if found.
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*/
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static bool __init found_memconsole(void)
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{
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unsigned int address;
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size_t length, cur;
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address = get_bios_ebda();
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if (!address) {
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pr_info("BIOS EBDA non-existent.\n");
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return false;
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}
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/* EBDA length is byte 0 of EBDA (in KB) */
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length = *(u8 *)phys_to_virt(address);
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length <<= 10; /* convert to bytes */
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/*
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* Search through EBDA for BIOS memory console structure
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* note: signature is not necessarily dword-aligned
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*/
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for (cur = 0; cur < length; cur++) {
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struct biosmemcon_ebda *hdr = phys_to_virt(address + cur);
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/* memconsole v1 */
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if (hdr->signature == BIOS_MEMCONSOLE_V1_MAGIC) {
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found_v1_header(hdr);
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return true;
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}
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/* memconsole v2 */
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if (hdr->signature == BIOS_MEMCONSOLE_V2_MAGIC) {
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found_v2_header(hdr);
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return true;
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}
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}
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pr_info("BIOS console EBDA structure not found!\n");
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return false;
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}
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static struct dmi_system_id memconsole_dmi_table[] __initdata = {
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{
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.ident = "Google Board",
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "Google, Inc."),
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},
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},
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{}
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};
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MODULE_DEVICE_TABLE(dmi, memconsole_dmi_table);
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static int __init memconsole_init(void)
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{
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if (!dmi_check_system(memconsole_dmi_table))
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return -ENODEV;
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if (!found_memconsole())
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return -ENODEV;
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memconsole_bin_attr.size = memconsole_length;
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return sysfs_create_bin_file(firmware_kobj, &memconsole_bin_attr);
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}
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EXPORT_SYMBOL(memconsole_sysfs_init);
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static void __exit memconsole_exit(void)
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void memconsole_exit(void)
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{
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sysfs_remove_bin_file(firmware_kobj, &memconsole_bin_attr);
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}
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module_init(memconsole_init);
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module_exit(memconsole_exit);
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EXPORT_SYMBOL(memconsole_exit);
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MODULE_AUTHOR("Google, Inc.");
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MODULE_LICENSE("GPL");
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@ -0,0 +1,43 @@
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/*
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* memconsole.h
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*
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* Internal headers of the memory based BIOS console.
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*
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* Copyright 2017 Google Inc.
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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 v2.0 as published by
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* the Free Software Foundation.
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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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#ifndef __FIRMWARE_GOOGLE_MEMCONSOLE_H
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#define __FIRMWARE_GOOGLE_MEMCONSOLE_H
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/*
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* memconsole_setup
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*
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* Initialize the memory console from raw (virtual) base
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* address and length.
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*/
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void memconsole_setup(void *baseaddr, size_t length);
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/*
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* memconsole_sysfs_init
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*
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* Update memory console length and create binary file
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* for firmware object.
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*/
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int memconsole_sysfs_init(void);
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/* memconsole_exit
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*
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* Unmap the console buffer.
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*/
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void memconsole_exit(void);
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#endif /* __FIRMWARE_GOOGLE_MEMCONSOLE_H */
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