diff options
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/google/Kconfig | 25 | ||||
| -rw-r--r-- | drivers/firmware/google/Makefile | 3 | ||||
| -rw-r--r-- | drivers/firmware/google/coreboot_table-acpi.c | 88 | ||||
| -rw-r--r-- | drivers/firmware/google/coreboot_table.c | 94 | ||||
| -rw-r--r-- | drivers/firmware/google/coreboot_table.h | 50 | ||||
| -rw-r--r-- | drivers/firmware/google/memconsole-coreboot.c | 109 |
6 files changed, 368 insertions, 1 deletions
diff --git a/drivers/firmware/google/Kconfig b/drivers/firmware/google/Kconfig index 27a0658b8523..840bd62e3b1c 100644 --- a/drivers/firmware/google/Kconfig +++ b/drivers/firmware/google/Kconfig @@ -19,9 +19,23 @@ config GOOGLE_SMI clearing the EFI event log and reading and writing NVRAM variables. +config GOOGLE_COREBOOT_TABLE + tristate + depends on GOOGLE_COREBOOT_TABLE_ACPI + +config GOOGLE_COREBOOT_TABLE_ACPI + tristate "Coreboot Table Access - ACPI" + depends on ACPI + select GOOGLE_COREBOOT_TABLE + help + This option enables the coreboot_table module, which provides other + firmware modules to access to the coreboot table. The coreboot table + pointer is accessed through the ACPI "GOOGCB00" object. + If unsure say N. + config GOOGLE_MEMCONSOLE tristate - depends on GOOGLE_MEMCONSOLE_X86_LEGACY + depends on GOOGLE_MEMCONSOLE_X86_LEGACY || GOOGLE_MEMCONSOLE_COREBOOT config GOOGLE_MEMCONSOLE_X86_LEGACY tristate "Firmware Memory Console - X86 Legacy support" @@ -32,4 +46,13 @@ config GOOGLE_MEMCONSOLE_X86_LEGACY the EBDA on Google servers. If found, this log is exported to userland in the file /sys/firmware/log. +config GOOGLE_MEMCONSOLE_COREBOOT + tristate "Firmware Memory Console" + depends on GOOGLE_COREBOOT_TABLE + select GOOGLE_MEMCONSOLE + help + This option enables the kernel to search for a firmware log in + the coreboot table. If found, this log is exported to userland + in the file /sys/firmware/log. + endif # GOOGLE_FIRMWARE diff --git a/drivers/firmware/google/Makefile b/drivers/firmware/google/Makefile index 10683ef8d2cd..662a83edb03c 100644 --- a/drivers/firmware/google/Makefile +++ b/drivers/firmware/google/Makefile @@ -1,4 +1,7 @@ obj-$(CONFIG_GOOGLE_SMI) += gsmi.o +obj-$(CONFIG_GOOGLE_COREBOOT_TABLE) += coreboot_table.o +obj-$(CONFIG_GOOGLE_COREBOOT_TABLE_ACPI) += coreboot_table-acpi.o obj-$(CONFIG_GOOGLE_MEMCONSOLE) += memconsole.o +obj-$(CONFIG_GOOGLE_MEMCONSOLE_COREBOOT) += memconsole-coreboot.o obj-$(CONFIG_GOOGLE_MEMCONSOLE_X86_LEGACY) += memconsole-x86-legacy.o diff --git a/drivers/firmware/google/coreboot_table-acpi.c b/drivers/firmware/google/coreboot_table-acpi.c new file mode 100644 index 000000000000..fb98db2d20e2 --- /dev/null +++ b/drivers/firmware/google/coreboot_table-acpi.c @@ -0,0 +1,88 @@ +/* + * coreboot_table-acpi.c + * + * Using ACPI to locate Coreboot table and provide coreboot table access. + * + * 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/acpi.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +#include "coreboot_table.h" + +static int coreboot_table_acpi_probe(struct platform_device *pdev) +{ + phys_addr_t phyaddr; + resource_size_t len; + struct coreboot_table_header __iomem *header = NULL; + struct resource *res; + void __iomem *ptr = NULL; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; + + len = resource_size(res); + if (!res->start || !len) + return -EINVAL; + + phyaddr = res->start; + header = ioremap_cache(phyaddr, sizeof(*header)); + if (header == NULL) + return -ENOMEM; + + ptr = ioremap_cache(phyaddr, + header->header_bytes + header->table_bytes); + iounmap(header); + if (!ptr) + return -ENOMEM; + + return coreboot_table_init(ptr); +} + +static int coreboot_table_acpi_remove(struct platform_device *pdev) +{ + return coreboot_table_exit(); +} + +static const struct acpi_device_id cros_coreboot_acpi_match[] = { + { "GOOGCB00", 0 }, + { "BOOT0000", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, cros_coreboot_acpi_match); + +static struct platform_driver coreboot_table_acpi_driver = { + .probe = coreboot_table_acpi_probe, + .remove = coreboot_table_acpi_remove, + .driver = { + .name = "coreboot_table_acpi", + .acpi_match_table = ACPI_PTR(cros_coreboot_acpi_match), + }, +}; + +static int __init coreboot_table_acpi_init(void) +{ + return platform_driver_register(&coreboot_table_acpi_driver); +} + +module_init(coreboot_table_acpi_init); + +MODULE_AUTHOR("Google, Inc."); +MODULE_LICENSE("GPL"); diff --git a/drivers/firmware/google/coreboot_table.c b/drivers/firmware/google/coreboot_table.c new file mode 100644 index 000000000000..0019d3ec18dd --- /dev/null +++ b/drivers/firmware/google/coreboot_table.c @@ -0,0 +1,94 @@ +/* + * coreboot_table.c + * + * Module providing coreboot table access. + * + * 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/err.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> + +#include "coreboot_table.h" + +struct coreboot_table_entry { + u32 tag; + u32 size; +}; + +static struct coreboot_table_header __iomem *ptr_header; + +/* + * This function parses the coreboot table for an entry that contains the base + * address of the given entry tag. The coreboot table consists of a header + * directly followed by a number of small, variable-sized entries, which each + * contain an identifying tag and their length as the first two fields. + */ +int coreboot_table_find(int tag, void *data, size_t data_size) +{ + struct coreboot_table_header header; + struct coreboot_table_entry entry; + void *ptr_entry; + int i; + + if (!ptr_header) + return -EPROBE_DEFER; + + memcpy_fromio(&header, ptr_header, sizeof(header)); + + if (strncmp(header.signature, "LBIO", sizeof(header.signature))) { + pr_warn("coreboot_table: coreboot table missing or corrupt!\n"); + return -ENODEV; + } + + ptr_entry = (void *)ptr_header + header.header_bytes; + + for (i = 0; i < header.table_entries; i++) { + memcpy_fromio(&entry, ptr_entry, sizeof(entry)); + if (entry.tag == tag) { + if (data_size < entry.size) + return -EINVAL; + + memcpy_fromio(data, ptr_entry, entry.size); + + return 0; + } + + ptr_entry += entry.size; + } + + return -ENOENT; +} +EXPORT_SYMBOL(coreboot_table_find); + +int coreboot_table_init(void __iomem *ptr) +{ + ptr_header = ptr; + + return 0; +} +EXPORT_SYMBOL(coreboot_table_init); + +int coreboot_table_exit(void) +{ + if (ptr_header) + iounmap(ptr_header); + + return 0; +} +EXPORT_SYMBOL(coreboot_table_exit); + +MODULE_AUTHOR("Google, Inc."); +MODULE_LICENSE("GPL"); diff --git a/drivers/firmware/google/coreboot_table.h b/drivers/firmware/google/coreboot_table.h new file mode 100644 index 000000000000..6eff1ae0c5d3 --- /dev/null +++ b/drivers/firmware/google/coreboot_table.h @@ -0,0 +1,50 @@ +/* + * coreboot_table.h + * + * Internal header for coreboot table access. + * + * 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 __COREBOOT_TABLE_H +#define __COREBOOT_TABLE_H + +#include <linux/io.h> + +/* List of coreboot entry structures that is used */ +struct lb_cbmem_ref { + uint32_t tag; + uint32_t size; + + uint64_t cbmem_addr; +}; + +/* Coreboot table header structure */ +struct coreboot_table_header { + char signature[4]; + u32 header_bytes; + u32 header_checksum; + u32 table_bytes; + u32 table_checksum; + u32 table_entries; +}; + +/* Retrieve coreboot table entry with tag *tag* and copy it to data */ +int coreboot_table_find(int tag, void *data, size_t data_size); + +/* Initialize coreboot table module given a pointer to iomem */ +int coreboot_table_init(void __iomem *ptr); + +/* Cleanup coreboot table module */ +int coreboot_table_exit(void); + +#endif /* __COREBOOT_TABLE_H */ diff --git a/drivers/firmware/google/memconsole-coreboot.c b/drivers/firmware/google/memconsole-coreboot.c new file mode 100644 index 000000000000..21210144def7 --- /dev/null +++ b/drivers/firmware/google/memconsole-coreboot.c @@ -0,0 +1,109 @@ +/* + * memconsole-coreboot.c + * + * Memory based BIOS console accessed through coreboot table. + * + * 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/platform_device.h> + +#include "memconsole.h" +#include "coreboot_table.h" + +#define CB_TAG_CBMEM_CONSOLE 0x17 + +/* CBMEM firmware console log descriptor. */ +struct cbmem_cons { + u32 buffer_size; + u32 buffer_cursor; + u8 buffer_body[0]; +} __packed; + +static struct cbmem_cons __iomem *cbmem_console; + +static int memconsole_coreboot_init(phys_addr_t physaddr) +{ + struct cbmem_cons __iomem *tmp_cbmc; + + tmp_cbmc = memremap(physaddr, sizeof(*tmp_cbmc), MEMREMAP_WB); + + if (!tmp_cbmc) + return -ENOMEM; + + cbmem_console = memremap(physaddr, + tmp_cbmc->buffer_size + sizeof(*cbmem_console), + MEMREMAP_WB); + memunmap(tmp_cbmc); + + if (!cbmem_console) + return -ENOMEM; + + memconsole_setup(cbmem_console->buffer_body, + min(cbmem_console->buffer_cursor, cbmem_console->buffer_size)); + + return 0; +} + +static int memconsole_probe(struct platform_device *pdev) +{ + int ret; + struct lb_cbmem_ref entry; + + ret = coreboot_table_find(CB_TAG_CBMEM_CONSOLE, &entry, sizeof(entry)); + if (ret) + return ret; + + ret = memconsole_coreboot_init(entry.cbmem_addr); + if (ret) + return ret; + + return memconsole_sysfs_init(); +} + +static int memconsole_remove(struct platform_device *pdev) +{ + memconsole_exit(); + + if (cbmem_console) + memunmap(cbmem_console); + + return 0; +} + +static struct platform_driver memconsole_driver = { + .probe = memconsole_probe, + .remove = memconsole_remove, + .driver = { + .name = "memconsole", + }, +}; + +static int __init platform_memconsole_init(void) +{ + struct platform_device *pdev; + + pdev = platform_device_register_simple("memconsole", -1, NULL, 0); + if (pdev == NULL) + return -ENODEV; + + platform_driver_register(&memconsole_driver); + + return 0; +} + +module_init(platform_memconsole_init); + +MODULE_AUTHOR("Google, Inc."); +MODULE_LICENSE("GPL"); |