This patch limits itself to fmap coming from booted coreboot,
not as used in images.
Signed-off-by: Vladimir Serbinenko <phco...@gmail.com>
---
grub-core/Makefile.core.def | 7 ++
grub-core/partmap/fmap.c | 172 ++++++++++++++++++++++++++++++++++++
2 files changed, 179 insertions(+)
create mode 100644 grub-core/partmap/fmap.c
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 8e1b1d9f3..28c5d9050 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -2016,6 +2016,13 @@ module = {
common = partmap/apple.c;
};
+module = {
+ name = part_fmap;
+ common = partmap/fmap.c;
+ enable = x86;
+ enable = coreboot;
+};
+
module = {
name = part_gpt;
common = partmap/gpt.c;
diff --git a/grub-core/partmap/fmap.c b/grub-core/partmap/fmap.c
new file mode 100644
index 000000000..2625e4c75
--- /dev/null
+++ b/grub-core/partmap/fmap.c
@@ -0,0 +1,172 @@
+/* gpt.c - Read GUID Partition Tables (GPT). */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2023 Free Software Foundation, Inc.
+ *
+ * GRUB 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/disk.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/partition.h>
+#include <grub/dl.h>
+#include <grub/i18n.h>
+#include <grub/coreboot/lbio.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+/* Definitions copied from fmap_serialized.h using BSDL. */
+#define FMAP_SIGNATURE "__FMAP__"
+#define FMAP_VER_MAJOR 1 /* this header's FMAP minor version */
+#define FMAP_VER_MINOR 1 /* this header's FMAP minor version */
+#define FMAP_STRLEN 32 /* maximum length for strings, */
+ /* including null-terminator */
+
+/* Mapping of volatile and static regions in firmware binary */
+struct grub_fmap_entry {
+ grub_uint32_t offset; /* offset relative to base */
+ grub_uint32_t size; /* size in bytes */
+ grub_uint8_t name[FMAP_STRLEN]; /* descriptive name */
+ grub_uint16_t flags; /* flags for this area */
+} GRUB_PACKED;
+
+struct grub_fmap_header {
+ grub_uint8_t signature[8]; /* "__FMAP__" (0x5F5F464D41505F5F) */
+ grub_uint8_t ver_major; /* major version */
+ grub_uint8_t ver_minor; /* minor version */
+ grub_uint64_t base; /* address of the firmware binary */
+ grub_uint32_t size; /* size of firmware binary in bytes */
+ grub_uint8_t name[FMAP_STRLEN]; /* name of this firmware binary */
+ grub_uint16_t nareas; /* number of areas described by
+ fmap_areas[] below */
+} GRUB_PACKED;
+
+static struct grub_partition_map grub_fmap_partition_map;
+
+
+
+static int
+validate_fmap_header(struct grub_fmap_header *header)
+{
+ if (grub_memcmp (header->signature, FMAP_SIGNATURE, sizeof
(header->signature)) != 0)
+ return 0;
+ if (header->ver_major != FMAP_VER_MAJOR || header->ver_minor !=
FMAP_VER_MINOR)
+ return 0;
+ return 1;
+}
+
+static grub_uint64_t cbfsdisk_fmap_offset = 0xffffffff;
+
+static int cbtable_iter (grub_linuxbios_table_item_t item,
+ void *ctxt_in __attribute__((unused)))
+{
+ if (item->tag == GRUB_LINUXBIOS_MEMBER_BOOT_MEDIA)
+ {
+ cbfsdisk_fmap_offset = ((struct grub_linuxbios_table_boot_media *) (item
+ 1))->fmap_offset;
+ return 1;
+ }
+
+ return 0;
+}
+
+static void
+discover_cbfsdisk_fmap_offset(void)
+{
+ static int discovery_done;
+ if (discovery_done)
+ return;
+ grub_linuxbios_table_iterate (cbtable_iter, NULL);
+}
+
+
+static grub_err_t
+grub_fmap_partition_map_iterate (grub_disk_t disk,
+ grub_partition_iterate_hook_t hook,
+ void *hook_data)
+{
+ struct grub_partition part;
+ struct grub_fmap_header header;
+ struct grub_fmap_entry entry;
+ unsigned int i;
+ grub_uint64_t header_offset = 0;
+ grub_uint64_t current_offset = 0;
+
+ if (disk->dev->id == GRUB_DISK_DEVICE_CBFSDISK_ID)
+ {
+ discover_cbfsdisk_fmap_offset();
+ header_offset = cbfsdisk_fmap_offset;
+ if (cbfsdisk_fmap_offset == 0xffffffff || cbfsdisk_fmap_offset ==
0xffffffffffffffffULL)
+ return grub_error(GRUB_ERR_BAD_PART_TABLE, "fmap not declared");
+ }
+ else
+ return grub_error(GRUB_ERR_BAD_PART_TABLE, "fmap in non-cbfs devices isn't
implemented yet");
+
+ /* Read the FMAP header. */
+ if (grub_disk_read (disk, header_offset >> GRUB_DISK_SECTOR_BITS,
header_offset & (GRUB_DISK_SECTOR_SIZE - 1), sizeof (header), &header))
+ return grub_errno;
+
+ if (!validate_fmap_header(&header))
+ return grub_error (GRUB_ERR_BAD_PART_TABLE, "no valid FMAP header");
+
+ grub_dprintf ("fmap", "Read a valid FMAP header\n");
+
+ current_offset = header_offset + sizeof(header);
+
+ for (i = 0; i < grub_le_to_cpu16 (header.nareas); i++)
+ {
+ if (grub_disk_read (disk, current_offset >> GRUB_DISK_SECTOR_BITS,
current_offset & (GRUB_DISK_SECTOR_SIZE - 1),
+ sizeof (entry), &entry))
+ return grub_errno;
+
+ /* TODO: What to do if it's not 512-bytes aligned? */
+ grub_uint64_t end = (grub_uint64_t) grub_le_to_cpu32 (entry.offset) +
(grub_uint64_t) grub_le_to_cpu32 (entry.size);
+ part.start = grub_le_to_cpu32 (entry.offset) >> GRUB_DISK_SECTOR_BITS;
+ part.len = (end >> GRUB_DISK_SECTOR_BITS) - part.start;
+ part.offset = current_offset >> GRUB_DISK_SECTOR_BITS;
+ part.number = i;
+ part.index = current_offset & (GRUB_DISK_SECTOR_SIZE - 1);
+ part.partmap = &grub_fmap_partition_map;
+ part.parent = disk->partition;
+
+ grub_dprintf ("gpt", "FMAP entry %d: start=0x%llx, length=0x%llx\n", i,
+ (unsigned long long) grub_le_to_cpu32 (entry.offset),
+ (unsigned long long) grub_le_to_cpu32 (entry.size));
+
+ if (hook (disk, &part, hook_data))
+ return grub_errno;
+
+ current_offset += sizeof (entry);
+ }
+
+ return GRUB_ERR_NONE;
+}
+
+
+/* Partition map type. */
+static struct grub_partition_map grub_fmap_partition_map =
+ {
+ .name = "fmap",
+ .iterate = grub_fmap_partition_map_iterate,
+ };
+
+GRUB_MOD_INIT(part_fmap)
+{
+ grub_partition_map_register (&grub_fmap_partition_map);
+}
+
+GRUB_MOD_FINI(part_fmap)
+{
+ grub_partition_map_unregister (&grub_fmap_partition_map);
+}
--
2.39.2
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