From bc70232918ad3fb45c2b5423455a5de6bc7efdef Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Wed, 24 Jul 2013 18:56:06 +0300 Subject: [PATCH] i386: add bios linker/loader This adds a dynamic bios linker/loader. This will be used by acpi table generation code to: - load each table in the appropriate memory segment - link tables to each other - fix up checksums after said linking Reviewed-by: Gerd Hoffmann Tested-by: Gerd Hoffmann Reviewed-by: Igor Mammedov Tested-by: Igor Mammedov Signed-off-by: Michael S. Tsirkin --- hw/i386/Makefile.objs | 1 + hw/i386/bios-linker-loader.c | 158 +++++++++++++++++++++++++++++++++++ hw/i386/bios-linker-loader.h | 27 ++++++ 3 files changed, 186 insertions(+) create mode 100644 hw/i386/bios-linker-loader.c create mode 100644 hw/i386/bios-linker-loader.h diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs index f95070773f..b9ca3803c1 100644 --- a/hw/i386/Makefile.objs +++ b/hw/i386/Makefile.objs @@ -5,6 +5,7 @@ obj-y += pc_sysfw.o obj-$(CONFIG_XEN) += xen_domainbuild.o xen_machine_pv.o obj-y += kvmvapic.o +obj-y += bios-linker-loader.o iasl-option=$(shell if test -z "`$(1) $(2) 2>&1 > /dev/null`" \ ; then echo "$(2)"; else echo "$(3)"; fi ;) diff --git a/hw/i386/bios-linker-loader.c b/hw/i386/bios-linker-loader.c new file mode 100644 index 0000000000..083385332e --- /dev/null +++ b/hw/i386/bios-linker-loader.c @@ -0,0 +1,158 @@ +/* Dynamic linker/loader of ACPI tables + * + * Copyright (C) 2013 Red Hat Inc + * + * Author: Michael S. Tsirkin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + + * 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. + + * You should have received a copy of the GNU General Public License along + * with this program; if not, see . + */ + +#include "bios-linker-loader.h" +#include "hw/nvram/fw_cfg.h" + +#include +#include +#include "qemu/bswap.h" + +#define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH + +struct BiosLinkerLoaderEntry { + uint32_t command; + union { + /* + * COMMAND_ALLOCATE - allocate a table from @alloc.file + * subject to @alloc.align alignment (must be power of 2) + * and @alloc.zone (can be HIGH or FSEG) requirements. + * + * Must appear exactly once for each file, and before + * this file is referenced by any other command. + */ + struct { + char file[BIOS_LINKER_LOADER_FILESZ]; + uint32_t align; + uint8_t zone; + } alloc; + + /* + * COMMAND_ADD_POINTER - patch the table (originating from + * @dest_file) at @pointer.offset, by adding a pointer to the table + * originating from @src_file. 1,2,4 or 8 byte unsigned + * addition is used depending on @pointer.size. + */ + struct { + char dest_file[BIOS_LINKER_LOADER_FILESZ]; + char src_file[BIOS_LINKER_LOADER_FILESZ]; + uint32_t offset; + uint8_t size; + } pointer; + + /* + * COMMAND_ADD_CHECKSUM - calculate checksum of the range specified by + * @cksum_start and @cksum_length fields, + * and then add the value at @cksum.offset. + * Checksum simply sums -X for each byte X in the range + * using 8-bit math. + */ + struct { + char file[BIOS_LINKER_LOADER_FILESZ]; + uint32_t offset; + uint32_t start; + uint32_t length; + } cksum; + + /* padding */ + char pad[124]; + }; +} QEMU_PACKED; +typedef struct BiosLinkerLoaderEntry BiosLinkerLoaderEntry; + +enum { + BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1, + BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2, + BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3, +}; + +enum { + BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1, + BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2, +}; + +GArray *bios_linker_loader_init(void) +{ + return g_array_new(false, true /* clear */, sizeof(BiosLinkerLoaderEntry)); +} + +/* Free linker wrapper and return the linker array. */ +void *bios_linker_loader_cleanup(GArray *linker) +{ + return g_array_free(linker, false); +} + +void bios_linker_loader_alloc(GArray *linker, + const char *file, + uint32_t alloc_align, + bool alloc_fseg) +{ + BiosLinkerLoaderEntry entry; + + memset(&entry, 0, sizeof entry); + strncpy(entry.alloc.file, file, sizeof entry.alloc.file - 1); + entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ALLOCATE); + entry.alloc.align = cpu_to_le32(alloc_align); + entry.alloc.zone = cpu_to_le32(alloc_fseg ? + BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG : + BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH); + + /* Alloc entries must come first, so prepend them */ + g_array_prepend_val(linker, entry); +} + +void bios_linker_loader_add_checksum(GArray *linker, const char *file, + void *table, + void *start, unsigned size, + uint8_t *checksum) +{ + BiosLinkerLoaderEntry entry; + + memset(&entry, 0, sizeof entry); + strncpy(entry.cksum.file, file, sizeof entry.cksum.file - 1); + entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM); + entry.cksum.offset = cpu_to_le32(checksum - (uint8_t *)table); + entry.cksum.start = cpu_to_le32((uint8_t *)start - (uint8_t *)table); + entry.cksum.length = cpu_to_le32(size); + + g_array_append_val(linker, entry); +} + +void bios_linker_loader_add_pointer(GArray *linker, + const char *dest_file, + const char *src_file, + GArray *table, void *pointer, + uint8_t pointer_size) +{ + BiosLinkerLoaderEntry entry; + + memset(&entry, 0, sizeof entry); + strncpy(entry.pointer.dest_file, dest_file, + sizeof entry.pointer.dest_file - 1); + strncpy(entry.pointer.src_file, src_file, + sizeof entry.pointer.src_file - 1); + entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ADD_POINTER); + entry.pointer.offset = cpu_to_le32((gchar *)pointer - table->data); + entry.pointer.size = pointer_size; + assert(pointer_size == 1 || pointer_size == 2 || + pointer_size == 4 || pointer_size == 8); + + g_array_append_val(linker, entry); +} diff --git a/hw/i386/bios-linker-loader.h b/hw/i386/bios-linker-loader.h new file mode 100644 index 0000000000..498c0af773 --- /dev/null +++ b/hw/i386/bios-linker-loader.h @@ -0,0 +1,27 @@ +#ifndef BIOS_LINKER_LOADER_H +#define BIOS_LINKER_LOADER_H + +#include +#include +#include + +GArray *bios_linker_loader_init(void); + +void bios_linker_loader_alloc(GArray *linker, + const char *file, + uint32_t alloc_align, + bool alloc_fseg); + +void bios_linker_loader_add_checksum(GArray *linker, const char *file, + void *table, + void *start, unsigned size, + uint8_t *checksum); + +void bios_linker_loader_add_pointer(GArray *linker, + const char *dest_file, + const char *src_file, + GArray *table, void *pointer, + uint8_t pointer_size); + +void *bios_linker_loader_cleanup(GArray *linker); +#endif