diff options
Diffstat (limited to 'pc-bios')
| -rw-r--r-- | pc-bios/s390-ccw/bootmap.c | 90 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/bootmap.h | 7 |
2 files changed, 97 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c index 82cca9c..415508b 100644 --- a/pc-bios/s390-ccw/bootmap.c +++ b/pc-bios/s390-ccw/bootmap.c @@ -462,6 +462,87 @@ static bool is_iso_bc_entry_compatible(IsoBcSection *s) return !_memcmp(magic_sec + 8, linux_s390_magic, 24); } +/* Location of the current sector of the directory */ +static uint32_t sec_loc[ISO9660_MAX_DIR_DEPTH]; +/* Offset in the current sector of the directory */ +static uint32_t sec_offset[ISO9660_MAX_DIR_DEPTH]; +/* Remained directory space in bytes */ +static uint32_t dir_rem[ISO9660_MAX_DIR_DEPTH]; + +static inline uint32_t iso_get_file_size(uint32_t load_rba) +{ + IsoVolDesc *vd = (IsoVolDesc *)sec; + IsoDirHdr *cur_record = &vd->vd.primary.rootdir; + uint8_t *temp = sec + ISO_SECTOR_SIZE; + int level = 0; + + read_iso_sector(ISO_PRIMARY_VD_SECTOR, sec, + "Failed to read ISO primary descriptor"); + sec_loc[0] = iso_733_to_u32(cur_record->ext_loc); + dir_rem[0] = 0; + sec_offset[0] = 0; + + while (level >= 0) { + IPL_assert(sec_offset[level] <= ISO_SECTOR_SIZE, + "Directory tree structure violation"); + + cur_record = (IsoDirHdr *)(temp + sec_offset[level]); + + if (sec_offset[level] == 0) { + read_iso_sector(sec_loc[level], temp, + "Failed to read ISO directory"); + if (dir_rem[level] == 0) { + /* Skip self and parent records */ + dir_rem[level] = iso_733_to_u32(cur_record->data_len) - + cur_record->dr_len; + sec_offset[level] += cur_record->dr_len; + + cur_record = (IsoDirHdr *)(temp + sec_offset[level]); + dir_rem[level] -= cur_record->dr_len; + sec_offset[level] += cur_record->dr_len; + continue; + } + } + + if (!cur_record->dr_len || sec_offset[level] == ISO_SECTOR_SIZE) { + /* Zero-padding and/or the end of current sector */ + dir_rem[level] -= ISO_SECTOR_SIZE - sec_offset[level]; + sec_offset[level] = 0; + sec_loc[level]++; + } else { + /* The directory record is valid */ + if (load_rba == iso_733_to_u32(cur_record->ext_loc)) { + return iso_733_to_u32(cur_record->data_len); + } + + dir_rem[level] -= cur_record->dr_len; + sec_offset[level] += cur_record->dr_len; + + if (cur_record->file_flags & 0x2) { + /* Subdirectory */ + if (level == ISO9660_MAX_DIR_DEPTH - 1) { + sclp_print("ISO-9660 directory depth limit exceeded\n"); + } else { + level++; + sec_loc[level] = iso_733_to_u32(cur_record->ext_loc); + sec_offset[level] = 0; + dir_rem[level] = 0; + continue; + } + } + } + + if (dir_rem[level] == 0) { + /* Nothing remaining */ + level--; + read_iso_sector(sec_loc[level], temp, + "Failed to read ISO directory"); + } + } + + return 0; +} + static void load_iso_bc_entry(IsoBcSection *load) { IsoBcSection s = *load; @@ -470,6 +551,15 @@ static void load_iso_bc_entry(IsoBcSection *load) * is padded and ISO_SECTOR_SIZE bytes aligned */ uint32_t blks_to_load = bswap16(s.sector_count) >> ET_SECTOR_SHIFT; + uint32_t real_size = iso_get_file_size(bswap32(s.load_rba)); + + if (real_size) { + /* Round up blocks to load */ + blks_to_load = (real_size + ISO_SECTOR_SIZE - 1) / ISO_SECTOR_SIZE; + sclp_print("ISO boot image size verified\n"); + } else { + sclp_print("ISO boot image size could not be verified\n"); + } read_iso_boot_image(bswap32(s.load_rba), (void *)((uint64_t)bswap16(s.load_segment)), diff --git a/pc-bios/s390-ccw/bootmap.h b/pc-bios/s390-ccw/bootmap.h index cc77fd7..f98765b 100644 --- a/pc-bios/s390-ccw/bootmap.h +++ b/pc-bios/s390-ccw/bootmap.h @@ -381,6 +381,11 @@ static inline uint64_t bswap64(uint64_t x) ((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 @@ -407,6 +412,8 @@ static inline void read_iso_boot_image(uint32_t block_offset, void *load_addr, 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; |