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
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
---
hw/i386/bios-linker-loader.h | 27 ++++++++
hw/i386/bios-linker-loader.c | 158 +++++++++++++++++++++++++++++++++++++++++++
hw/i386/Makefile.objs | 1 +
3 files changed, 186 insertions(+)
create mode 100644 hw/i386/bios-linker-loader.h
create mode 100644 hw/i386/bios-linker-loader.c
diff --git a/hw/i386/bios-linker-loader.h b/hw/i386/bios-linker-loader.h
new file mode 100644
index 0000000..498c0af
--- /dev/null
+++ b/hw/i386/bios-linker-loader.h
@@ -0,0 +1,27 @@
+#ifndef BIOS_LINKER_LOADER_H
+#define BIOS_LINKER_LOADER_H
+
+#include <glib.h>
+#include <stdbool.h>
+#include <inttypes.h>
+
+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
diff --git a/hw/i386/bios-linker-loader.c b/hw/i386/bios-linker-loader.c
new file mode 100644
index 0000000..0833853
--- /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 <m...@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 "bios-linker-loader.h"
+#include "hw/nvram/fw_cfg.h"
+
+#include <string.h>
+#include <assert.h>
+#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/Makefile.objs b/hw/i386/Makefile.objs
index f950707..b9ca380 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 ;)
--
MST
