This add a dynamic bios linker/loader. This will be used by acpi table generation code to: - load each table in the appropriate memory egment - link tables to each other - fix up checksums after said linking
Signed-off-by: Michael S. Tsirkin mst@redhat.com --- hw/i386/Makefile.objs | 1 + hw/i386/bios-linker-loader.c | 155 +++++++++++++++++++++++++++++++++++ include/hw/i386/bios-linker-loader.h | 26 ++++++ 3 files changed, 182 insertions(+) create mode 100644 hw/i386/bios-linker-loader.c create mode 100644 include/hw/i386/bios-linker-loader.h
diff --git a/hw/i386/Makefile.objs b/hw/i386/Makefile.objs index 013d250..71be2da 100644 --- a/hw/i386/Makefile.objs +++ b/hw/i386/Makefile.objs @@ -4,6 +4,7 @@ obj-y += pc.o pc_piix.o pc_q35.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 0000000..b2c87d7 --- /dev/null +++ b/hw/i386/bios-linker-loader.c @@ -0,0 +1,155 @@ +/* Dynamic linker/loader of ACPI tables + * + * Copyright (C) 2013 Red Hat Inc + * + * Author: Michael S. Tsirkin mst@redhat.com + * + * 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 http://www.gnu.org/licenses/. + */ + +#include "hw/i386/bios-linker-loader.h" + +#include <string.h> +#include <assert.h> +#include "qemu/bswap.h" + +#define BIOS_LINKER_LOADER_FILESZ 56 + +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 alloc_file[BIOS_LINKER_LOADER_FILESZ]; + uint32_t alloc_align; + uint8_t alloc_zone; + }; + + /* + * 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 pointer_dest_file[BIOS_LINKER_LOADER_FILESZ]; + char pointer_src_file[BIOS_LINKER_LOADER_FILESZ]; + uint32_t pointer_offset; + uint8_t pointer_size; + }; + + /* + * 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 cksum_file[BIOS_LINKER_LOADER_FILESZ]; + uint32_t cksum_offset; + uint32_t cksum_start; + uint32_t cksum_length; + }; + + /* padding */ + char pad[124]; + }; +}; +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_init(void) +{ + return g_array_new(false, true /* clear */, sizeof(BiosLinkerLoaderEntry)); +} + +/* Free linker wrapper and return the linker array. */ +void *bios_linker_cleanup(GArray *linker) +{ + return g_array_free(linker, false); +} + +void bios_linker_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_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_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/include/hw/i386/bios-linker-loader.h b/include/hw/i386/bios-linker-loader.h new file mode 100644 index 0000000..18c3868 --- /dev/null +++ b/include/hw/i386/bios-linker-loader.h @@ -0,0 +1,26 @@ +#ifndef BIOS_LINKER_LOADER_H +#define BIOS_LINKER_LOADER_H + +#include <glib.h> +#include <stdbool.h> +#include <inttypes.h> + +GArray *bios_linker_init(void); + +void bios_linker_alloc(GArray *linker, + const char *file, + uint32_t alloc_align, + bool alloc_fseg); + +void bios_linker_add_checksum(GArray *linker, const char *file, void *table, + void *start, unsigned size, uint8_t *checksum); + + +void bios_linker_add_pointer(GArray *linker, + const char *dest_file, + const char *src_file, + GArray *table, void *pointer, + uint8_t pointer_size); + +void *bios_linker_cleanup(GArray *linker); +#endif