mirror of https://github.com/proxmox/mirror_qemu
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 <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
master
Michael S. Tsirkin
parent
35c12e60c8
commit
bc70232918
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@ -5,6 +5,7 @@ obj-y += pc_sysfw.o
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obj-$(CONFIG_XEN) += xen_domainbuild.o xen_machine_pv.o
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obj-y += kvmvapic.o
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obj-y += bios-linker-loader.o
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iasl-option=$(shell if test -z "`$(1) $(2) 2>&1 > /dev/null`" \
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; then echo "$(2)"; else echo "$(3)"; fi ;)
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@ -0,0 +1,158 @@
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/* Dynamic linker/loader of ACPI tables
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*
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* Copyright (C) 2013 Red Hat Inc
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*
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* Author: Michael S. Tsirkin <mst@redhat.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "bios-linker-loader.h"
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#include "hw/nvram/fw_cfg.h"
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#include <string.h>
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#include <assert.h>
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#include "qemu/bswap.h"
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#define BIOS_LINKER_LOADER_FILESZ FW_CFG_MAX_FILE_PATH
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struct BiosLinkerLoaderEntry {
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uint32_t command;
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union {
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/*
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* COMMAND_ALLOCATE - allocate a table from @alloc.file
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* subject to @alloc.align alignment (must be power of 2)
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* and @alloc.zone (can be HIGH or FSEG) requirements.
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*
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* Must appear exactly once for each file, and before
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* this file is referenced by any other command.
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*/
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struct {
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char file[BIOS_LINKER_LOADER_FILESZ];
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uint32_t align;
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uint8_t zone;
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} alloc;
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/*
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* COMMAND_ADD_POINTER - patch the table (originating from
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* @dest_file) at @pointer.offset, by adding a pointer to the table
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* originating from @src_file. 1,2,4 or 8 byte unsigned
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* addition is used depending on @pointer.size.
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*/
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struct {
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char dest_file[BIOS_LINKER_LOADER_FILESZ];
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char src_file[BIOS_LINKER_LOADER_FILESZ];
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uint32_t offset;
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uint8_t size;
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} pointer;
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/*
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* COMMAND_ADD_CHECKSUM - calculate checksum of the range specified by
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* @cksum_start and @cksum_length fields,
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* and then add the value at @cksum.offset.
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* Checksum simply sums -X for each byte X in the range
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* using 8-bit math.
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*/
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struct {
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char file[BIOS_LINKER_LOADER_FILESZ];
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uint32_t offset;
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uint32_t start;
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uint32_t length;
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} cksum;
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/* padding */
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char pad[124];
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};
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} QEMU_PACKED;
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typedef struct BiosLinkerLoaderEntry BiosLinkerLoaderEntry;
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enum {
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BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1,
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BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2,
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BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
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};
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enum {
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BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
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BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
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};
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GArray *bios_linker_loader_init(void)
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{
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return g_array_new(false, true /* clear */, sizeof(BiosLinkerLoaderEntry));
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}
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/* Free linker wrapper and return the linker array. */
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void *bios_linker_loader_cleanup(GArray *linker)
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{
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return g_array_free(linker, false);
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}
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void bios_linker_loader_alloc(GArray *linker,
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const char *file,
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uint32_t alloc_align,
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bool alloc_fseg)
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{
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BiosLinkerLoaderEntry entry;
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memset(&entry, 0, sizeof entry);
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strncpy(entry.alloc.file, file, sizeof entry.alloc.file - 1);
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entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ALLOCATE);
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entry.alloc.align = cpu_to_le32(alloc_align);
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entry.alloc.zone = cpu_to_le32(alloc_fseg ?
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BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG :
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BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH);
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/* Alloc entries must come first, so prepend them */
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g_array_prepend_val(linker, entry);
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}
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void bios_linker_loader_add_checksum(GArray *linker, const char *file,
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void *table,
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void *start, unsigned size,
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uint8_t *checksum)
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{
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BiosLinkerLoaderEntry entry;
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memset(&entry, 0, sizeof entry);
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strncpy(entry.cksum.file, file, sizeof entry.cksum.file - 1);
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entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM);
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entry.cksum.offset = cpu_to_le32(checksum - (uint8_t *)table);
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entry.cksum.start = cpu_to_le32((uint8_t *)start - (uint8_t *)table);
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entry.cksum.length = cpu_to_le32(size);
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g_array_append_val(linker, entry);
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}
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void bios_linker_loader_add_pointer(GArray *linker,
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const char *dest_file,
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const char *src_file,
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GArray *table, void *pointer,
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uint8_t pointer_size)
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{
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BiosLinkerLoaderEntry entry;
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memset(&entry, 0, sizeof entry);
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strncpy(entry.pointer.dest_file, dest_file,
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sizeof entry.pointer.dest_file - 1);
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strncpy(entry.pointer.src_file, src_file,
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sizeof entry.pointer.src_file - 1);
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entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ADD_POINTER);
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entry.pointer.offset = cpu_to_le32((gchar *)pointer - table->data);
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entry.pointer.size = pointer_size;
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assert(pointer_size == 1 || pointer_size == 2 ||
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pointer_size == 4 || pointer_size == 8);
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g_array_append_val(linker, entry);
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}
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@ -0,0 +1,27 @@
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#ifndef BIOS_LINKER_LOADER_H
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#define BIOS_LINKER_LOADER_H
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#include <glib.h>
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#include <stdbool.h>
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#include <inttypes.h>
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GArray *bios_linker_loader_init(void);
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void bios_linker_loader_alloc(GArray *linker,
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const char *file,
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uint32_t alloc_align,
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bool alloc_fseg);
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void bios_linker_loader_add_checksum(GArray *linker, const char *file,
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void *table,
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void *start, unsigned size,
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uint8_t *checksum);
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void bios_linker_loader_add_pointer(GArray *linker,
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const char *dest_file,
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const char *src_file,
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GArray *table, void *pointer,
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uint8_t pointer_size);
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void *bios_linker_loader_cleanup(GArray *linker);
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#endif
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