diff options
Diffstat (limited to 'pc-bios/s390-ccw/bootmap.h')
| -rw-r--r-- | pc-bios/s390-ccw/bootmap.h | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/bootmap.h b/pc-bios/s390-ccw/bootmap.h index ab132e3579..f98765b841 100644 --- a/pc-bios/s390-ccw/bootmap.h +++ b/pc-bios/s390-ccw/bootmap.h @@ -341,4 +341,210 @@ static inline bool magic_match(const void *data, const void *magic) return *((uint32_t *)data) == *((uint32_t *)magic); } +static inline int _memcmp(const void *s1, const void *s2, size_t n) +{ + int i; + const uint8_t *p1 = s1, *p2 = s2; + + for (i = 0; i < n; i++) { + if (p1[i] != p2[i]) { + return p1[i] > p2[i] ? 1 : -1; + } + } + + return 0; +} + +/* from include/qemu/bswap.h */ + +/* El Torito is always little-endian */ +static inline uint16_t bswap16(uint16_t x) +{ + return ((x & 0x00ff) << 8) | ((x & 0xff00) >> 8); +} + +static inline uint32_t bswap32(uint32_t x) +{ + return ((x & 0x000000ffU) << 24) | ((x & 0x0000ff00U) << 8) | + ((x & 0x00ff0000U) >> 8) | ((x & 0xff000000U) >> 24); +} + +static inline uint64_t bswap64(uint64_t x) +{ + return ((x & 0x00000000000000ffULL) << 56) | + ((x & 0x000000000000ff00ULL) << 40) | + ((x & 0x0000000000ff0000ULL) << 24) | + ((x & 0x00000000ff000000ULL) << 8) | + ((x & 0x000000ff00000000ULL) >> 8) | + ((x & 0x0000ff0000000000ULL) >> 24) | + ((x & 0x00ff000000000000ULL) >> 40) | + ((x & 0xff00000000000000ULL) >> 56); +} + +static inline uint32_t iso_733_to_u32(uint64_t x) +{ + return (uint32_t)x; +} + +#define ISO_SECTOR_SIZE 2048 +/* El Torito specifies boot image size in 512 byte blocks */ +#define ET_SECTOR_SHIFT 2 +#define KERN_IMAGE_START 0x010000UL +#define PSW_MASK_64 0x0000000100000000ULL +#define PSW_MASK_32 0x0000000080000000ULL +#define IPL_PSW_MASK (PSW_MASK_32 | PSW_MASK_64) + +#define ISO_PRIMARY_VD_SECTOR 16 + +static inline void read_iso_sector(uint32_t block_offset, void *buf, + const char *errmsg) +{ + IPL_assert(virtio_read_many(block_offset, buf, 1) == 0, errmsg); +} + +static inline void read_iso_boot_image(uint32_t block_offset, void *load_addr, + uint32_t blks_to_load) +{ + IPL_assert(virtio_read_many(block_offset, load_addr, blks_to_load) == 0, + "Failed to read boot image!"); +} + +const uint8_t el_torito_magic[] = "EL TORITO SPECIFICATION" + "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; + +#define ISO9660_MAX_DIR_DEPTH 8 + +typedef struct IsoDirHdr { + uint8_t dr_len; + uint8_t ear_len; + uint64_t ext_loc; + uint64_t data_len; + uint8_t recording_datetime[7]; + uint8_t file_flags; + uint8_t file_unit_size; + uint8_t gap_size; + uint32_t vol_seqnum; + uint8_t fileid_len; +} __attribute__((packed)) IsoDirHdr; + +typedef struct IsoVdElTorito { + uint8_t el_torito[32]; /* must contain el_torito_magic value */ + uint8_t unused0[32]; + uint32_t bc_offset; + uint8_t unused1[1974]; +} __attribute__((packed)) IsoVdElTorito; + +typedef struct IsoVdPrimary { + uint8_t unused1; + uint8_t sys_id[32]; + uint8_t vol_id[32]; + uint8_t unused2[8]; + uint64_t vol_space_size; + uint8_t unused3[32]; + uint32_t vol_set_size; + uint32_t vol_seqnum; + uint32_t log_block_size; + uint64_t path_table_size; + uint32_t l_path_table; + uint32_t opt_l_path_table; + uint32_t m_path_table; + uint32_t opt_m_path_table; + IsoDirHdr rootdir; + uint8_t root_null; + uint8_t reserved2[1858]; +} __attribute__((packed)) IsoVdPrimary; + +typedef struct IsoVolDesc { + uint8_t type; + uint8_t ident[5]; + uint8_t version; + union { + IsoVdElTorito boot; + IsoVdPrimary primary; + } vd; +} __attribute__((packed)) IsoVolDesc; + +const uint8_t vol_desc_magic[] = "CD001"; +#define VOL_DESC_TYPE_BOOT 0 +#define VOL_DESC_TYPE_PRIMARY 1 +#define VOL_DESC_TYPE_SUPPLEMENT 2 +#define VOL_DESC_TYPE_PARTITION 3 +#define VOL_DESC_TERMINATOR 255 + +static inline bool is_iso_vd_valid(IsoVolDesc *vd) +{ + return !_memcmp(&vd->ident[0], vol_desc_magic, 5) && + vd->version == 0x1 && + vd->type <= VOL_DESC_TYPE_PARTITION; +} + +typedef struct IsoBcValid { + uint8_t platform_id; + uint16_t reserved; + uint8_t id[24]; + uint16_t checksum; + uint8_t key[2]; +} __attribute__((packed)) IsoBcValid; + +typedef struct IsoBcSection { + uint8_t boot_type; + uint16_t load_segment; + uint8_t sys_type; + uint8_t unused; + uint16_t sector_count; + uint32_t load_rba; + uint8_t selection[20]; +} __attribute__((packed)) IsoBcSection; + +typedef struct IsoBcHdr { + uint8_t platform_id; + uint16_t sect_num; + uint8_t id[28]; +} __attribute__((packed)) IsoBcHdr; + +/* + * Match two CCWs located after PSW and eight filler bytes. + * From libmagic and arch/s390/kernel/head.S. + */ +const uint8_t linux_s390_magic[] = "\x02\x00\x00\x18\x60\x00\x00\x50\x02\x00" + "\x00\x68\x60\x00\x00\x50\x40\x40\x40\x40" + "\x40\x40\x40\x40"; + +typedef struct IsoBcEntry { + uint8_t id; + union { + IsoBcValid valid; /* id == 0x01 */ + IsoBcSection sect; /* id == 0x88 || id == 0x0 */ + IsoBcHdr hdr; /* id == 0x90 || id == 0x91 */ + } body; +} __attribute__((packed)) IsoBcEntry; + +#define ISO_BC_ENTRY_PER_SECTOR (ISO_SECTOR_SIZE / sizeof(IsoBcEntry)) +#define ISO_BC_HDR_VALIDATION 0x01 +#define ISO_BC_BOOTABLE_SECTION 0x88 +#define ISO_BC_MAGIC_55 0x55 +#define ISO_BC_MAGIC_AA 0xaa +#define ISO_BC_PLATFORM_X86 0x0 +#define ISO_BC_PLATFORM_PPC 0x1 +#define ISO_BC_PLATFORM_MAC 0x2 + +static inline bool is_iso_bc_valid(IsoBcEntry *e) +{ + IsoBcValid *v = &e->body.valid; + + if (e->id != ISO_BC_HDR_VALIDATION) { + return false; + } + + if (v->platform_id != ISO_BC_PLATFORM_X86 && + v->platform_id != ISO_BC_PLATFORM_PPC && + v->platform_id != ISO_BC_PLATFORM_MAC) { + return false; + } + + return v->key[0] == ISO_BC_MAGIC_55 && + v->key[1] == ISO_BC_MAGIC_AA && + v->reserved == 0x0; +} + #endif /* _PC_BIOS_S390_CCW_BOOTMAP_H */ |