vbatts/grub
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

gpt: new gptprio.next command for selecting priority based partitions

Browse source 
Basic usage would look something like this:

    gptprio.next -d usr_dev -u usr_uuid
    linuxefi ($usr_dev)/boot/vmlinuz mount.usr=PARTUUID=$usr_uuid

After booting the system should set the 'successful' bit on the
partition that was used.
This commit is contained in:
Michael Marineau 2014-11-03 17:14:37 -08:00
parent d3c2759e83
commit e49d5b587e
5 changed files with 448 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

49
include/grub/gpt_partition.h
View file

@ -53,6 +53,10 @@ typedef struct grub_gpt_guid grub_gpt_part_type_t;
GRUB_GPT_GUID_INIT (0x5808c8aa, 0x7e8f, 0x42e0, \
0x85, 0xd2, 0xe1, 0xe9, 0x04, 0x34, 0xcf, 0xb3)
#define GRUB_GPT_PARTITION_TYPE_USR_X86_64 \
GRUB_GPT_GUID_INIT (0x5dfbf5f4, 0x2848, 0x4bac, \
0xaa, 0x5e, 0x0d, 0x9a, 0x20, 0xb7, 0x45, 0xa6)
#define GRUB_GPT_HEADER_MAGIC \
{ 0x45, 0x46, 0x49, 0x20, 0x50, 0x41, 0x52, 0x54 }
@ -87,6 +91,51 @@ struct grub_gpt_partentry
char name[72];
} GRUB_PACKED;
enum grub_gpt_part_attr_offset
{
/* Standard partition attribute bits defined by UEFI. */
GRUB_GPT_PART_ATTR_OFFSET_REQUIRED = 0,
GRUB_GPT_PART_ATTR_OFFSET_NO_BLOCK_IO_PROTOCOL = 1,
GRUB_GPT_PART_ATTR_OFFSET_LEGACY_BIOS_BOOTABLE = 2,
/* De facto standard attribute bits defined by Microsoft and reused by
* http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec */
GRUB_GPT_PART_ATTR_OFFSET_READ_ONLY = 60,
GRUB_GPT_PART_ATTR_OFFSET_NO_AUTO = 63,
/* Partition attributes for priority based selection,
* Currently only valid for PARTITION_TYPE_USR_X86_64.
* TRIES_LEFT and PRIORITY are 4 bit wide fields. */
GRUB_GPT_PART_ATTR_OFFSET_GPTPRIO_PRIORITY = 48,
GRUB_GPT_PART_ATTR_OFFSET_GPTPRIO_TRIES_LEFT = 52,
GRUB_GPT_PART_ATTR_OFFSET_GPTPRIO_SUCCESSFUL = 56,
};
/* Helpers for reading/writing partition attributes. */
static inline grub_uint64_t
grub_gpt_entry_attribute (struct grub_gpt_partentry *entry,
enum grub_gpt_part_attr_offset offset,
unsigned int bits)
{
grub_uint64_t attrib = grub_le_to_cpu64 (entry->attrib);
return (attrib >> offset) & ((1ULL << bits) - 1);
}
static inline void
grub_gpt_entry_set_attribute (struct grub_gpt_partentry *entry,
grub_uint64_t value,
enum grub_gpt_part_attr_offset offset,
unsigned int bits)
{
grub_uint64_t attrib, mask;
mask = (((1ULL << bits) - 1) << offset);
attrib = grub_le_to_cpu64 (entry->attrib) & ~mask;
attrib |= ((value << offset) & mask);
entry->attrib = grub_cpu_to_le64 (attrib);
}
/* Basic GPT partmap module. */
grub_err_t
grub_gpt_partition_map_iterate (grub_disk_t disk,