diff options
Diffstat (limited to '')
| -rw-r--r-- | include/gbos.inc | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/include/gbos.inc b/include/gbos.inc index 329430c..3b96f56 100644 --- a/include/gbos.inc +++ b/include/gbos.inc @@ -46,7 +46,22 @@ DEF KSTACK_TOP EQU $D000 ; kernel stack top (grows down into WRAM0) ; Process table ; ----------------------------------------------------------------------------- DEF MAX_PROCS EQU 8 -DEF NUM_RAM_BANKS EQU 4 ; MBC5 cart RAM banks available (-r 3 = 32 KiB) +DEF NUM_RAM_BANKS EQU 8 ; process data/stack banks 0..7 (of 16; -r 4 = 128 KiB) + +; ----------------------------------------------------------------------------- +; Block device (persistent, battery-backed cart RAM). The "disk" is cart-RAM +; banks FS_BANK0.. accessed 256 bytes at a time through a WRAM bounce buffer +; (read_block / write_block), so only those two routines ever touch banking. +; ----------------------------------------------------------------------------- +DEF FS_BANK0 EQU 8 ; disk starts at cart-RAM bank 8 +DEF FS_NBLOCKS EQU 128 ; 128 blocks x 256 B = 32 KiB (banks 8..11) +DEF BLK_SIZE EQU 256 +DEF BLK_PERBANK EQU 32 ; 8 KiB / 256 +DEF SUPER_BLOCK EQU 0 ; block 0 = superblock +DEF SUPER_MAG0 EQU $47 ; 'G' +DEF SUPER_MAG1 EQU $42 ; 'B' +DEF SUPER_MAG2 EQU $46 ; 'F' +DEF SUPER_MAG3 EQU $53 ; 'S' DEF KSTACK_TOP2 EQU $D000 ; kernel stack top reused for syscalls (fork) DEF INIT_PID EQU 1 ; pid of the init task (orphan reaper) @@ -102,7 +117,9 @@ DEF SYS_LOOKUP EQU 19 ; program id for a command name (DE=name -> A=id/$FF) DEF SYS_PS EQU 20 ; process table entry (B=slot, DE=buf3 -> A=1/0) DEF SYS_PROGNAME EQU 21 ; program id -> name (B=id, DE=namebuf) DEF SYS_REAP EQU 22 ; reap a zombie child, nohang (-> A=pid or 0) -DEF SYS_MAX EQU 23 +DEF SYS_BFILL EQU 23 ; [debug] fill a disk block (B=block, E=byte) +DEF SYS_BPEEK EQU 24 ; [debug] read a disk block[0] (B=block -> A) +DEF SYS_MAX EQU 25 ; SYS_KILL (9) is now implemented (B=pid -> A=0/$FF; pid 1 is immortal) ; (SYS_OPEN=4 / SYS_CLOSE=5 are now implemented by the filesystem) @@ -148,5 +165,6 @@ DEF PROG_RM EQU 15 DEF PROG_PS EQU 16 DEF PROG_KILL EQU 17 DEF PROG_SPIN EQU 18 +DEF PROG_BLK EQU 19 ENDC |