Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Thierry Escande | 467 | 88.61% | 1 | 33.33% |
Julius Werner | 58 | 11.01% | 1 | 33.33% |
Christoph Hellwig | 2 | 0.38% | 1 | 33.33% |
Total | 527 | 3 |
/* * 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 <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 char *memconsole_baseaddr; static size_t memconsole_length; static ssize_t memconsole_read(char *buf, loff_t pos, size_t count) { return memory_read_from_buffer(buf, count, &pos, memconsole_baseaddr, memconsole_length); } 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_baseaddr = phys_to_virt(hdr->v1.buffer_addr); memconsole_length = hdr->v1.num_chars; memconsole_setup(memconsole_read); } 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_baseaddr = phys_to_virt(hdr->v2.buffer_addr + hdr->v2.start); memconsole_length = hdr->v2.end - hdr->v2.start; memconsole_setup(memconsole_read); } /* * 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 const struct dmi_system_id memconsole_dmi_table[] __initconst = { { .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");
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