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path: root/hw/acpi/bios-linker-loader.c
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Diffstat (limited to 'hw/acpi/bios-linker-loader.c')
-rw-r--r--hw/acpi/bios-linker-loader.c66
1 files changed, 63 insertions, 3 deletions
diff --git a/hw/acpi/bios-linker-loader.c b/hw/acpi/bios-linker-loader.c
index d963ebe241..046183a0f1 100644
--- a/hw/acpi/bios-linker-loader.c
+++ b/hw/acpi/bios-linker-loader.c
@@ -78,6 +78,21 @@ struct BiosLinkerLoaderEntry {
uint32_t length;
} cksum;
+ /*
+ * COMMAND_WRITE_POINTER - write the fw_cfg file (originating from
+ * @dest_file) at @wr_pointer.offset, by adding a pointer to
+ * @src_offset within the table originating from @src_file.
+ * 1,2,4 or 8 byte unsigned addition is used depending on
+ * @wr_pointer.size.
+ */
+ struct {
+ char dest_file[BIOS_LINKER_LOADER_FILESZ];
+ char src_file[BIOS_LINKER_LOADER_FILESZ];
+ uint32_t dst_offset;
+ uint32_t src_offset;
+ uint8_t size;
+ } wr_pointer;
+
/* padding */
char pad[124];
};
@@ -85,9 +100,10 @@ struct BiosLinkerLoaderEntry {
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,
+ BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1,
+ BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2,
+ BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
+ BIOS_LINKER_LOADER_COMMAND_WRITE_POINTER = 0x4,
};
enum {
@@ -278,3 +294,47 @@ void bios_linker_loader_add_pointer(BIOSLinker *linker,
g_array_append_vals(linker->cmd_blob, &entry, sizeof entry);
}
+
+/*
+ * bios_linker_loader_write_pointer: ask guest to write a pointer to the
+ * source file into the destination file, and write it back to QEMU via
+ * fw_cfg DMA.
+ *
+ * @linker: linker object instance
+ * @dest_file: destination file that must be written
+ * @dst_patched_offset: location within destination file blob to be patched
+ * with the pointer to @src_file, in bytes
+ * @dst_patched_offset_size: size of the pointer to be patched
+ * at @dst_patched_offset in @dest_file blob, in bytes
+ * @src_file: source file who's address must be taken
+ * @src_offset: location within source file blob to which
+ * @dest_file+@dst_patched_offset will point to after
+ * firmware's executed WRITE_POINTER command
+ */
+void bios_linker_loader_write_pointer(BIOSLinker *linker,
+ const char *dest_file,
+ uint32_t dst_patched_offset,
+ uint8_t dst_patched_size,
+ const char *src_file,
+ uint32_t src_offset)
+{
+ BiosLinkerLoaderEntry entry;
+ const BiosLinkerFileEntry *source_file =
+ bios_linker_find_file(linker, src_file);
+
+ assert(source_file);
+ assert(src_offset < source_file->blob->len);
+ memset(&entry, 0, sizeof entry);
+ strncpy(entry.wr_pointer.dest_file, dest_file,
+ sizeof entry.wr_pointer.dest_file - 1);
+ strncpy(entry.wr_pointer.src_file, src_file,
+ sizeof entry.wr_pointer.src_file - 1);
+ entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_WRITE_POINTER);
+ entry.wr_pointer.dst_offset = cpu_to_le32(dst_patched_offset);
+ entry.wr_pointer.src_offset = cpu_to_le32(src_offset);
+ entry.wr_pointer.size = dst_patched_size;
+ assert(dst_patched_size == 1 || dst_patched_size == 2 ||
+ dst_patched_size == 4 || dst_patched_size == 8);
+
+ g_array_append_vals(linker->cmd_blob, &entry, sizeof entry);
+}