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Add constants for FAT12 partition

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Jakob Lechner 2025-01-02 14:56:10 +01:00
parent 22c94f13a2
commit 1f8a8ff81a
1 changed files with 20 additions and 11 deletions
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31
src/main.rs
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@ -134,6 +134,10 @@ fn main() -> ! {
)
};
const OEM: [u8; 8] = *b"mkfs.fat";
const FILESYSTEM_ID: [u8; 4] = [0xDE, 0xAD, 0xBE, 0xEF];
const FILESYSTEM_NAME: [u8; 11] = *b"RAM_USB\0\0\0\0";
storage[0x1B8..0x1BC].copy_from_slice(&[0xEF, 0xBE, 0xAD, 0xDE]);
storage[0x1BE..0x1C3].copy_from_slice(&[0x00, 0x00, 0x02, 0x00, 0x01]);
storage[0x1C3] = last_head as u8;
@ -145,20 +149,25 @@ fn main() -> ! {
storage[0x1CC] = (LBA >> 16) as u8;
storage[0x1CD] = (LBA >> 24) as u8;
storage[0x1FE..0x200].copy_from_slice(&[0x55, 0xaa]); // boot signature
storage[0x200..0x23E].copy_from_slice(&[
/* 000 */ 0xEB, 0x3C, 0x90, b'm', b'k', b'f', b's', b'.', b'f', b'a', b't', 0x00, 0x02, 0x04, 0x01, 0x00,
/* 010 */ 0x02, 0x00, 0x02, (DISK_BLOCK_NUM & 0xff) as u8,
(DISK_BLOCK_NUM >> 8) as u8,
0xF8, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
/* 020 */ 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x29, 0xDE, 0xAD, 0xBE, 0xEF, b'R', b'A', b'M', b'_', b'U',
/* 030 */ b'S', b'B', b' ', b' ', b' ', b' ', b'F', b'A', b'T', b'1', b'2', b' ', b' ', b' '
]);
// FAT12 Partition
storage[0x200..0x203].copy_from_slice(&[0xEB, 0x3C, 0x90]);
storage[0x203..0x20B].copy_from_slice(&OEM);
storage[0x20B..0x227].copy_from_slice(&[0x00, 0x02, 0x04, 0x01, 0x00,
0x02, 0x00, 0x02, (DISK_BLOCK_NUM & 0xff) as u8,
(DISK_BLOCK_NUM >> 8) as u8,
0xF8, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x29]);
storage[0x227..0x22B].copy_from_slice(&FILESYSTEM_ID);
storage[0x22B..0x236].copy_from_slice(&FILESYSTEM_NAME);
storage[0x236..0x23E].copy_from_slice(b"FAT12 ");
storage[0x3FE..0x400].copy_from_slice(&[0x55, 0xAA]);
storage[0x400..0x403].copy_from_slice(&[0xF8, 0xFF, 0xFF]);
storage[0x600..0x603].copy_from_slice(&[0xF8, 0xFF, 0xFF]);
storage[0x800..0x81A].copy_from_slice(&[
/* 600 */ b'R', b'A', b'M', b'_', b'U', b'S', b'B', b' ', b' ', b' ', b' ', 0x08, 0x00, 0x00, 0xF9, 0x98,
/* 610 */ 0x3A, 0x58, 0x3A, 0x58, 0x00, 0x00, 0xF9, 0x98, 0x3A, 0x58
storage[0x800..0x80B].copy_from_slice(&FILESYSTEM_NAME);
storage[0x80B..0x81A].copy_from_slice(&[0x08, 0x00, 0x00, 0xF9, 0x98,
0x3A, 0x58, 0x3A, 0x58, 0x00, 0x00, 0xF9, 0x98, 0x3A, 0x58
]);
let mut state: State = State {