mirror of
git://projects.qi-hardware.com/iris.git
synced 2024-07-02 23:32:57 +03:00
551 lines
18 KiB
COBOL
551 lines
18 KiB
COBOL
#pypp 0
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#include <iris.hh>
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#include <devices.hh>
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#define SECTOR_BITS 9
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#define BLOCK_MASK (~((1 << SECTOR_BITS) - 1))
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#define ROOT_CLUSTER 0x7fffffff
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static unsigned _free
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extern unsigned _end
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void init_alloc ():
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_free = ((unsigned)&_end + PAGE_SIZE - 1) & PAGE_MASK
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char *alloc_space (unsigned pages):
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unsigned ret = (_free + PAGE_SIZE - 1) & PAGE_MASK
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_free = ret + (pages << PAGE_BITS)
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return (char *)ret
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void *operator new[] (unsigned size):
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//kdebug ("new ")
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void *ret = (void *)_free
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size = (size + 3) & ~3
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unsigned rest = PAGE_SIZE - (((_free - 1) & ~PAGE_MASK) + 1)
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if rest < size:
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unsigned pages = ((size - rest) + PAGE_SIZE - 1) >> PAGE_BITS
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for unsigned p = 0; p < pages; ++p:
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Iris::Page page = Iris::my_memory.create_page ()
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page.set_flags (Iris::Page::PAYING | Iris::Page::FRAME, Iris::Page::PAYING | Iris::Page::FRAME)
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Iris::my_memory.map (page, _free + rest + (p << PAGE_BITS))
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Iris::free_cap (page)
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_free += size
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//kdebug_num ((unsigned)ret)
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//kdebug ("+")
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//kdebug_num (size)
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//kdebug ("\n")
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return ret
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void *operator new (unsigned size):
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return new char[size]
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static Iris::WString dev
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static Iris::Num device_size
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static Iris::Page page
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static char *data
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static Iris::Num current_block
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static void read_block (Iris::Num idx, Iris::Page p = page, unsigned size = 1 << SECTOR_BITS, unsigned offset = 0):
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if p.code == page.code:
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if idx.value () == current_block.value () && offset == 0 && size == 1 << SECTOR_BITS:
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return
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current_block = idx
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//kdebug ("fat getting block: ")
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//kdebug_num (idx.h)
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//kdebug (":")
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//kdebug_num (idx.l)
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//kdebug ("+")
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//kdebug_num (size)
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//kdebug ("@")
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//kdebug_num (offset)
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//kdebug ("\n")
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dev.get_block (idx, size, offset, p)
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struct Fat:
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char oem[8]
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unsigned sector_size_bits
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unsigned sectors_per_cluster_bits
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unsigned reserved_sectors
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unsigned num_fats
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unsigned root_entries
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unsigned sectors
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unsigned media
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unsigned sectors_per_fat
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unsigned sectors_per_track
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unsigned heads
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unsigned hidden_sectors
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unsigned active_fat
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bool write_all_fats
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unsigned fs_version
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unsigned root_cluster
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unsigned fsinfo_sector
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unsigned boot_backup_sector
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unsigned drive
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unsigned current_head
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unsigned volume_id
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char label[0xb]
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unsigned bits
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unsigned clusters
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unsigned cluster_size_bits
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unsigned root_sectors
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unsigned header_sectors
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unsigned bad_clusters
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unsigned free_clusters
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unsigned last_alloced
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unsigned *fat
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unsigned first_free_cluster, first_bad_cluster
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void print_num (char const *pre, unsigned data):
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kdebug ("\t")
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kdebug (pre)
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unsigned bytes = 1
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while bytes < 8 && data >> (bytes * 4):
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++bytes
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kdebug_num (data, bytes)
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kdebug ("\n")
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void print_br ():
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kdebug ("\tOEM: '")
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for unsigned i = 0; i < 8; ++i:
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kdebug_char (oem[i])
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kdebug ("'\n")
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print_num ("bytes per sector: ", 1 << sector_size_bits)
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print_num ("sectors per cluster: ", 1 << sectors_per_cluster_bits)
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print_num ("reserved sectors: ", reserved_sectors)
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print_num ("number of fats: ", num_fats)
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print_num ("entries in root directory: ", root_entries)
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print_num ("sectors: ", sectors)
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print_num ("media descriptor: ", media)
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print_num ("sectors per fat: ", sectors_per_fat)
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print_num ("sectors per track: ", sectors_per_track)
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print_num ("heads: ", heads)
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print_num ("hidden sectors: ", hidden_sectors)
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print_num ("active_fat: ", active_fat)
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kdebug ("\twrite all: ")
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kdebug (write_all_fats ? "yes\n" : "no\n")
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print_num ("fs version: ", fs_version)
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print_num ("root cluster: ", root_cluster)
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print_num ("fsinfo sector: ", fsinfo_sector)
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print_num ("boot sector backup sector: ", boot_backup_sector)
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print_num ("drive: ", drive)
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print_num ("current head: ", current_head)
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print_num ("volume id: ", volume_id)
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kdebug ("\tlabel: '")
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for unsigned i = 0; i < 0xb; ++i:
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kdebug_char (label[i])
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kdebug ("'\n")
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print_num ("bits: ", bits)
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print_num ("clusters: ", clusters)
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print_num ("header sectors: ", header_sectors)
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unsigned read_num (char *data, unsigned bytes):
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unsigned ret = 0
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for unsigned i = 0; i < bytes; ++i:
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ret |= (data[i] & 0xff) << (i * 8)
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return ret
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void map_fat_cluster (unsigned c, unsigned offset = 0):
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read_block ((hidden_sectors + reserved_sectors + ((c * bits + 8 * offset) >> (sector_size_bits + 3))) << sector_size_bits)
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unsigned make_bits (unsigned orig):
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unsigned ret
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for ret = 0; ret < 32; ++ret:
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if orig == 1 << ret:
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return ret
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Iris::panic (ret, "non-power of 2")
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return ret
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void reset ():
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read_block (0)
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if data[0x1fe] != 0x55 || (data[0x1ff] & 0xff) != 0xaa:
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kdebug ("invalid boot record signature in fat device\n")
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for unsigned i = 0; i < 8; ++i:
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oem[i] = data[3 + i]
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sector_size_bits = make_bits (read_num (data + 0xb, 2))
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sectors_per_cluster_bits = make_bits (read_num (data + 0xd, 1))
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cluster_size_bits = sector_size_bits + sectors_per_cluster_bits
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reserved_sectors = read_num (data + 0xe, 2)
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num_fats = read_num (data + 0x10, 1)
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root_entries = read_num (data + 0x11, 2)
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sectors = read_num (data + 0x13, 2)
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media = read_num (data + 0x15, 1)
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sectors_per_fat = read_num (data + 0x16, 2)
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sectors_per_track = read_num (data + 0x18, 2)
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heads = read_num (data + 0x1a, 2)
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hidden_sectors = read_num (data + 0x1c, 4)
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if !sectors:
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sectors = read_num (data + 0x20, 4)
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if Iris::Num (sectors).value () << sector_size_bits > device_size.value ():
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sectors = device_size.value () >> sector_size_bits
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kdebug ("warning: limiting sectors because of limited device size\n")
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root_sectors = (root_entries * 32 + (1 << sector_size_bits) - 1) >> sector_size_bits
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header_sectors = hidden_sectors + reserved_sectors + sectors_per_fat * num_fats + root_sectors
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clusters = (sectors - header_sectors) >> sectors_per_cluster_bits
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unsigned skip
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if clusters >= 65525:
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bits = 32
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sectors_per_fat = read_num (data + 0x24, 4)
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active_fat = read_num (data + 0x28, 2)
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write_all_fats = active_fat & 0x80
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active_fat &= 0xf
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fs_version = read_num (data + 0x2a, 2)
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root_cluster = read_num (data + 0x2c, 4)
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fsinfo_sector = read_num (data + 0x30, 2)
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boot_backup_sector = read_num (data + 0x32, 2)
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skip = 0x40 - 0x24
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else:
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if clusters < 4085:
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bits = 12
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else:
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bits = 16
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skip = 0
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active_fat = 0
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write_all_fats = true
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fs_version = 0
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root_cluster = 0
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fsinfo_sector = 0
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boot_backup_sector = 0
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unsigned fat_entries_per_sector = (8 << sector_size_bits) / bits
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unsigned fat_entries = sectors_per_fat * fat_entries_per_sector
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if clusters + 2 > fat_entries:
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clusters = fat_entries - 2
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kdebug ("warning: limiting clusters because of limited sector count\n")
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drive = read_num (data + skip + 0x24, 1)
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current_head = read_num (data + skip + 0x25, 1)
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if data[skip + 0x26] == 0x29:
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volume_id = read_num (data + skip + 0x27, 4)
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for unsigned i = 0; i < 0xb; ++i:
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label[i] = data[skip + 0x2b + i]
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char *id = data + skip + 0x36
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if id[0] != 'F' || id[1] != 'A' || id[2] != 'T' || id[5] != ' ' || id[6] != ' ' || id[7] != ' ':
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kdebug ("warning: file system type field was not 'FATxx '\n")
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else:
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switch bits:
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case 12:
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if id[3] != '1' || id[4] != '2':
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kdebug ("warning: id for fat12 is not FAT12\n")
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break
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case 16:
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if id[3] != '1' || id[4] != '6':
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kdebug ("warning: id for fat16 is not FAT16\n")
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break
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case 32:
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if id[3] != '3' || id[4] != '2':
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kdebug ("warning: id for fat32 wat not FAT32")
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break
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else:
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volume_id = 0
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for unsigned i = 0; i < 0xb; ++i:
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label[i] = 0
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if fsinfo_sector:
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read_block (fsinfo_sector << sector_size_bits)
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if (data[0] & 0xff) != 0x52 || (data[1] & 0xff) != 0x52 || (data[2] & 0xff) != 0x6a || (data[3] & 0xff) != 0x41 || (data[0x1e4] & 0xff) != 0x72 || (data[0x1e5] & 0xff) != 0x72 || (data[0x1e6] & 0xff) != 0x4a || (data[0x1e7] & 0xff) != 0x61 || (data[0x1fe] & 0xff) != 0x55 || (data[0x1ff] & 0xff) != 0xaa:
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kdebug ("invalid signature in fsinfo structure\n")
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free_clusters = read_num (data + 0x1e8, 4)
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last_alloced = read_num (data + 0x1ec, 4)
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else:
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free_clusters = ~0
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last_alloced = ~0
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// Now read the FAT.
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bad_clusters = 0
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fat = new unsigned[clusters]
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unsigned counted_free_clusters = 0
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for unsigned c = 0; c < clusters; ++c:
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// reduced cluster.
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unsigned rc = c & (1 << sector_size_bits) - 1
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// The next line does nothing most of the time.
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map_fat_cluster (c)
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switch bits:
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case 12:
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fat[c] = data[(rc + 2) * 2] & 0xff
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// There may be a sector boundary in the middle of the entry, so optionally reread.
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map_fat_cluster (c, 1)
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fat[c] |= (data[(rc + 2) * 2 + 1] & 0xff) << 8
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if c & 1:
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fat[c] >>= 4
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else:
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fat[c] &= 0xfff
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break
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case 16:
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fat[c] = read_num (data + (rc + 2) * 2, 2)
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break
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case 32:
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fat[c] = read_num (data + (rc + 2) * 4, 4)
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break
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// Correct for the crazy +2 offset, and keep a list of bad and free clusters.
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if fat[c] == 0:
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// Free cluster.
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fat[c] = first_free_cluster
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first_free_cluster = c
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++counted_free_clusters
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else if fat[c] == 1:
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// Invalid value.
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Iris::panic (0, "entry is '1' in fat.")
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else if bits == 12 && fat[c] == 0xfff || bits == 16 && fat[c] == 0xffff || bits == 32 && fat[c] == 0xfffffff:
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// Last cluster in chain.
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fat[c] = ~0
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else if bits == 12 && fat[c] == 0xff7 || bits == 16 && fat[c] == 0xfff7 || bits == 32 && fat[c] == 0xffffff7:
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// Bad cluster.
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fat[c] = first_bad_cluster
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first_bad_cluster = c
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++bad_clusters
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else:
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// Non-last cluster in chain.
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fat[c] -= 2
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unsigned fat_lookup (unsigned first_cluster, unsigned cluster):
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while cluster--:
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first_cluster = fat[first_cluster]
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if first_cluster == ~0:
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kdebug ("sector beyond end of file requested\n")
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return ~0
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return first_cluster
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struct File:
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Fat *fat
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unsigned size
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unsigned first_cluster
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char name[11]
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bool archive, readonly, system, hidden, directory, volume
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unsigned create_second, create_minute_hour, create_date, access_date, time, date
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void load_cluster (unsigned idx, Iris::Page p = page, unsigned offset = 0):
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unsigned cluster = fat->fat_lookup (first_cluster, idx >> fat->cluster_size_bits)
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kdebug ("loading cluster ")
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kdebug_num (idx)
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kdebug ("@")
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kdebug_num (cluster)
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kdebug (" from file\n")
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if cluster == ~0:
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kdebug ("invalid cluster requested from file\n")
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return
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read_block ((fat->header_sectors + (Iris::Num (cluster).value () << fat->sectors_per_cluster_bits)) << fat->sector_size_bits, p, 1 << fat->cluster_size_bits, offset)
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kdebug ("sector ")
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kdebug_num (fat->header_sectors + (Iris::Num (cluster).value () << fat->sectors_per_cluster_bits))
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kdebug ("\n")
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void get_dir_entry (unsigned dir, unsigned idx, File *f):
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f->fat = this
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unsigned sector = idx >> (sector_size_bits - 5)
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unsigned num = (idx << 5) & ~BLOCK_MASK
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Iris::Num hwsector
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if dir == ROOT_CLUSTER:
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if sector < root_sectors:
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hwsector = header_sectors - root_sectors + sector
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else:
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hwsector = ~0
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else:
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unsigned entry = fat_lookup (dir, sector)
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if entry == ~0:
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hwsector = ~0
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else:
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hwsector = header_sectors + (Iris::Num (entry).value () << sectors_per_cluster_bits)
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if hwsector.value () == ~0:
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kdebug ("invalid sector requested from directory\n")
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f->first_cluster = ~0
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return
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read_block (hwsector.value () << sector_size_bits)
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char *e = &data[num]
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for unsigned i = 0; i < 11; ++i:
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f->name[i] = e[i]
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f->archive = e[0xb] & 0x20
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f->readonly = e[0xb] & 0x10
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f->system = e[0xb] & 0x8
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f->hidden = e[0xb] & 0x4
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f->directory = e[0xb] & 0x2
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f->volume = e[0xb] & 0x1
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f->create_second = read_num (e + 0xd, 1)
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f->create_minute_hour = read_num (e + 0xe, 2)
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f->create_date = read_num (e + 0x10, 2)
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f->access_date = read_num (e + 0x12, 2)
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f->time = read_num (e + 0x16, 1)
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f->date = read_num (e + 0x18, 1)
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f->size = read_num (e + 0x1c, 4)
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f->first_cluster = (read_num (e + 0x14, 2) << 16 | read_num (e + 0x1a, 2)) - 2
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// Capability encoding.
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// 0:ROOT_CLUSTER = non fat-32 root directory.
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// 0:cluster = other directory.
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// cluster:index = file index from directory at cluster.
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// cluster|0x80000000:index = filename for file with index from directory at cluster.
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Iris::Num start ():
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init_alloc ()
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current_block = ~0
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dev = Iris::my_parent.get_capability <Iris::WString> ()
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if dev.get_align_bits () > SECTOR_BITS:
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kdebug ("fat device doesn't support 512 byte access")
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return 1
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device_size = dev.get_size ()
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data = (char *)0x15000; //alloc_space (1)
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page = Iris::my_memory.create_page ()
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page.set_flags (Iris::Page::PAYING, Iris::Page::PAYING)
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Iris::my_memory.map (page, (unsigned)data)
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Fat fat
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fat.reset ()
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fat.print_br ()
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Iris::Cap root
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if fat.root_cluster:
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root = Iris::my_receiver.create_capability (Iris::Num (fat.root_cluster, 0))
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else:
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root = Iris::my_receiver.create_capability (Iris::Num (ROOT_CLUSTER, 0))
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Iris::my_parent.provide_capability <Iris::Directory> (root.copy ())
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Iris::free_cap (root)
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while true:
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Iris::wait ()
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unsigned dir = Iris::recv.protected_data.h
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if dir & 0x80000000:
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// File name.
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unsigned idx = Iris::recv.protected_data.l
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Iris::Cap reply = Iris::get_reply ()
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unsigned num = Iris::recv.data[1].l
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unsigned size = Iris::recv.data[0].h >> 16
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unsigned cmd = Iris::recv.data[0].l
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Fat::File f
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fat.get_dir_entry (dir & ~0x80000000, idx, &f)
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switch cmd:
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case Iris::String::GET_SIZE:
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kdebug ("filename size requested\n")
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reply.invoke (11)
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break
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case Iris::String::GET_CHARS:
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//kdebug ("filename chars requested\n")
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/**/union { unsigned u[4]; char c[16]; } u
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for unsigned k = 0; k < 4; ++k:
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u.u[k] = 0
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for unsigned k = 0; k + num < 11; ++k:
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u.c[k] = f.name[k + num]
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reply.invoke (Iris::Num (u.u[0], u.u[1]), Iris::Num (u.u[2], u.u[3]))
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break
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case Iris::String::GET_ALIGN_BITS:
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kdebug ("filename align requested\n")
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reply.invoke (0)
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break
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case Iris::String::GET_BLOCK:
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default:
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Iris::panic (Iris::recv.data[0].l, "invalid request for fat filename")
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Iris::free_cap (reply)
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else if dir:
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// File.
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unsigned idx = Iris::recv.protected_data.l
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Iris::Cap reply = Iris::get_reply ()
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Iris::Cap arg = Iris::get_arg ()
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Iris::Num num = Iris::recv.data[1]
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unsigned size = Iris::recv.data[0].h >> 16
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unsigned offset = Iris::recv.data[0].h & 0xffff
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unsigned cmd = Iris::recv.data[0].l
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Fat::File f
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fat.get_dir_entry (dir, idx, &f)
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switch cmd:
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case Iris::String::GET_SIZE:
|
|
kdebug ("file size requested\n")
|
|
reply.invoke (f.size)
|
|
break
|
|
case Iris::String::GET_CHARS:
|
|
kdebug ("file chars requested\n")
|
|
unsigned mask = 1 << (fat.cluster_size_bits) - 1
|
|
f.load_cluster (num.l & ~mask)
|
|
unsigned n = num.l & mask & ~0xf
|
|
unsigned *dat = (unsigned *)(data + n)
|
|
reply.invoke (Iris::Num (dat[0], dat[1]), Iris::Num (dat[2], dat[3]))
|
|
break
|
|
case Iris::String::GET_ALIGN_BITS:
|
|
kdebug ("file align requested\n")
|
|
reply.invoke (fat.cluster_size_bits)
|
|
break
|
|
case Iris::String::GET_BLOCK:
|
|
kdebug ("file block requested\n")
|
|
unsigned mask = 1 << (fat.cluster_size_bits) - 1
|
|
if offset > PAGE_SIZE:
|
|
kdebug ("invalid offset requested\n")
|
|
break
|
|
if size + offset > PAGE_SIZE:
|
|
size = PAGE_SIZE - offset
|
|
for unsigned i = 0; i < size; i += 1 << fat.cluster_size_bits:
|
|
f.load_cluster ((num.l & ~mask) + i, arg, i + offset)
|
|
reply.invoke ()
|
|
break
|
|
case Iris::WString::TRUNCATE:
|
|
case Iris::WString::SET_CHARS:
|
|
case Iris::WString::SET_BLOCK:
|
|
Iris::panic (Iris::recv.data[0].l, "writing to files not supported yet")
|
|
default:
|
|
Iris::panic (Iris::recv.data[0].l, "invalid request for fat file")
|
|
Iris::free_cap (reply)
|
|
Iris::free_cap (arg)
|
|
else:
|
|
// Directory.
|
|
if Iris::recv.protected_data.l != ROOT_CLUSTER:
|
|
// Normal directory.
|
|
switch Iris::recv.data[0].l:
|
|
case Iris::Directory::GET_SIZE:
|
|
kdebug ("dir size requested\n")
|
|
Iris::recv.reply.invoke ()
|
|
break
|
|
case Iris::Directory::GET_NAME:
|
|
kdebug ("dir name requested\n")
|
|
Iris::recv.reply.invoke ()
|
|
break
|
|
case Iris::Directory::GET_FILE_RO:
|
|
kdebug ("dir file requested\n")
|
|
Iris::Cap reply = Iris::get_reply ()
|
|
Iris::Cap ret = Iris::my_receiver.create_capability (Iris::Num (Iris::recv.data[1].l, Iris::recv.protected_data.l))
|
|
reply.invoke (0, 0, ret.copy ())
|
|
Iris::free_cap (reply)
|
|
Iris::free_cap (ret)
|
|
break
|
|
case Iris::Directory::GET_FILE_INFO:
|
|
kdebug ("dir file info requested\n")
|
|
Iris::recv.reply.invoke ()
|
|
break
|
|
case Iris::Directory::LOCK_RO:
|
|
case Iris::Directory::UNLOCK_RO:
|
|
kdebug ("dir lock or unlock requested\n")
|
|
Iris::recv.reply.invoke ()
|
|
break
|
|
default:
|
|
kdebug ("invalid dir operation requested\n")
|
|
Iris::recv.reply.invoke ()
|
|
break
|
|
else:
|
|
// Non-fat32 root directory.
|
|
switch Iris::recv.data[0].l:
|
|
case Iris::Directory::GET_SIZE:
|
|
kdebug ("root size requested\n")
|
|
Iris::recv.reply.invoke (fat.root_entries)
|
|
break
|
|
case Iris::Directory::GET_NAME:
|
|
//kdebug ("root name requested\n")
|
|
Iris::Cap reply = Iris::get_reply ()
|
|
Iris::Cap ret = Iris::my_receiver.create_capability (Iris::Num (Iris::recv.data[1].l, Iris::recv.protected_data.l | 0x80000000))
|
|
reply.invoke (0, 0, ret.copy ())
|
|
Iris::free_cap (reply)
|
|
Iris::free_cap (ret)
|
|
break
|
|
case Iris::Directory::GET_FILE_RO:
|
|
kdebug ("root file requested\n")
|
|
Iris::Cap reply = Iris::get_reply ()
|
|
Iris::Cap ret = Iris::my_receiver.create_capability (Iris::Num (Iris::recv.data[1].l, Iris::recv.protected_data.l))
|
|
reply.invoke (0, 0, ret.copy ())
|
|
Iris::free_cap (reply)
|
|
Iris::free_cap (ret)
|
|
break
|
|
case Iris::Directory::GET_FILE_INFO:
|
|
kdebug ("root file info requested\n")
|
|
Iris::recv.reply.invoke ()
|
|
break
|
|
case Iris::Directory::LOCK_RO:
|
|
case Iris::Directory::UNLOCK_RO:
|
|
kdebug ("root lock or unlock requested\n")
|
|
Iris::recv.reply.invoke ()
|
|
break
|
|
default:
|
|
kdebug ("invalid root operation requested\n")
|
|
Iris::recv.reply.invoke ()
|
|
break
|