| Message ID | 20200319165632.14014-2-xypron.glpk@gmx.de |
|---|---|
| State | Superseded |
| Headers | show |
| Series | efi_loader: detect EFI system partition | expand |
Hi Heinrich, Heinrich Schuchardt <xypron.glpk at gmx.de> writes: > Up to now for MBR and GPT partitions the info field 'bootable' was set to 1 > if either the partition was an EFI system partition or the bootable flag > was set. > > Turn info field 'bootable' into a bit mask with separate bits for bootable > and EFI system partition. > > This will allow us to identify the EFI system partition in the UEFI > sub-system. > > Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de> > --- > disk/part_dos.c | 10 ++++++++-- > disk/part_efi.c | 12 ++++++++---- > include/part.h | 11 ++++++++++- > 3 files changed, 26 insertions(+), 7 deletions(-) > [...] > diff --git a/include/part.h b/include/part.h > index 0b5cf3d5e8..a63d1d0cda 100644 > --- a/include/part.h > +++ b/include/part.h > @@ -51,13 +51,22 @@ struct block_drvr { > #define PART_TYPE_LEN 32 > #define MAX_SEARCH_PARTITIONS 64 > > +#define PART_BOOTABLE 1 > +#define PART_EFI_SYSTEM_PARTITION 2 As these defines are used as flags, it be better to use the BIT() macro to make it explicit that these are bit positions rather than sequential values. Thanks, Punit > + > typedef struct disk_partition { > lbaint_t start; /* # of first block in partition */ > lbaint_t size; /* number of blocks in partition */ > ulong blksz; /* block size in bytes */ > uchar name[PART_NAME_LEN]; /* partition name */ > uchar type[PART_TYPE_LEN]; /* string type description */ > - int bootable; /* Active/Bootable flag is set */ > + /* > + * The bootable is a bitmask with the following fields: > + * > + * PART_BOOTABLE the MBR bootable flag is set > + * PART_EFI_SYSTEM_PARTITION the partition is an EFI system partition > + */ > + int bootable; > #if CONFIG_IS_ENABLED(PARTITION_UUIDS) > char uuid[UUID_STR_LEN + 1]; /* filesystem UUID as string, if exists */ > #endif > -- > 2.20.1
diff --git a/disk/part_dos.c b/disk/part_dos.c index 83ff40d310..0ec7f1628e 100644 --- a/disk/part_dos.c +++ b/disk/part_dos.c @@ -45,9 +45,15 @@ static inline int is_extended(int part_type) part_type == 0x85); } -static inline int is_bootable(dos_partition_t *p) +static int is_bootable(dos_partition_t *p) { - return (p->sys_ind == 0xef) || (p->boot_ind == 0x80); + int ret = 0; + + if (p->sys_ind == 0xef) + ret |= PART_EFI_SYSTEM_PARTITION; + if (p->boot_ind == 0x80) + ret |= PART_BOOTABLE; + return ret; } static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector, diff --git a/disk/part_efi.c b/disk/part_efi.c index b2e157d9c1..19f1f43f4e 100644 --- a/disk/part_efi.c +++ b/disk/part_efi.c @@ -71,11 +71,15 @@ static char *print_efiname(gpt_entry *pte) static const efi_guid_t system_guid = PARTITION_SYSTEM_GUID; -static inline int is_bootable(gpt_entry *p) +static int is_bootable(gpt_entry *p) { - return p->attributes.fields.legacy_bios_bootable || - !memcmp(&(p->partition_type_guid), &system_guid, - sizeof(efi_guid_t)); + int ret = 0; + + if (!memcmp(&p->partition_type_guid, &system_guid, sizeof(efi_guid_t))) + ret |= PART_EFI_SYSTEM_PARTITION; + if (p->attributes.fields.legacy_bios_bootable) + ret |= PART_BOOTABLE; + return ret; } static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba, diff --git a/include/part.h b/include/part.h index 0b5cf3d5e8..a63d1d0cda 100644 --- a/include/part.h +++ b/include/part.h @@ -51,13 +51,22 @@ struct block_drvr { #define PART_TYPE_LEN 32 #define MAX_SEARCH_PARTITIONS 64 +#define PART_BOOTABLE 1 +#define PART_EFI_SYSTEM_PARTITION 2 + typedef struct disk_partition { lbaint_t start; /* # of first block in partition */ lbaint_t size; /* number of blocks in partition */ ulong blksz; /* block size in bytes */ uchar name[PART_NAME_LEN]; /* partition name */ uchar type[PART_TYPE_LEN]; /* string type description */ - int bootable; /* Active/Bootable flag is set */ + /* + * The bootable is a bitmask with the following fields: + * + * PART_BOOTABLE the MBR bootable flag is set + * PART_EFI_SYSTEM_PARTITION the partition is an EFI system partition + */ + int bootable; #if CONFIG_IS_ENABLED(PARTITION_UUIDS) char uuid[UUID_STR_LEN + 1]; /* filesystem UUID as string, if exists */ #endif
Up to now for MBR and GPT partitions the info field 'bootable' was set to 1 if either the partition was an EFI system partition or the bootable flag was set. Turn info field 'bootable' into a bit mask with separate bits for bootable and EFI system partition. This will allow us to identify the EFI system partition in the UEFI sub-system. Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de> --- disk/part_dos.c | 10 ++++++++-- disk/part_efi.c | 12 ++++++++---- include/part.h | 11 ++++++++++- 3 files changed, 26 insertions(+), 7 deletions(-) -- 2.20.1