Portions Copyright (C) 1995 by Stefan Nitschke
****************************************************************/
/* 2015-01-17 Will Sowerbutts: Ported from UZI-180 to Fuzix */
+/* Assumes 512-byte sectors, 3.5" 1.44 MB formatted disks */
#include <kernel.h>
#include <kdata.h>
extern int devfd_write(uint8_t minor);
/* variables in devfd2.s */
-extern uint8_t devfd_track, devfd_sector, devfd_error;
+extern uint8_t devfd_track, devfd_sector, devfd_error, devfd_userbuf;
extern char *devfd_buffer;
-extern struct {
- uint8_t logged;
- uint8_t cbyte0;
- uint8_t cbyte1;
- uint8_t gap3;
- uint8_t spt;
- uint8_t sector1;
- uint8_t format;
- uint8_t spinup;
- uint8_t curtrk;
- uint8_t ncyl;
-} devfd_dtbl[4];
+/* D D D D D D D D Format Byte
+ 7 6 5 4 3 2 1 0
+ | | | | | | +-+----- Sector Size: 000=128, 001=256, 010=512, 011=1024 bytes
+ | | | | +-+--------- Disk Size: 00=fixed disk, 01=8", 10=5.25", 11=3.5"
+ | | | +------------- 0 = Normal 300 RPM MFM, 1 = "High-Density" Drive
+ | | +--------------- 0 = Single-Sided, 1 = Double-Sided
+ | +----------------- 0 = Double-Density, 1 = Single-Density
+ +------------------- 0 = 250 kbps (normal MFM), 1 = 500 kbps (Hi-Density) */
+
+#define IBMPC3 0xAE /* 10101110B HD, DD, DS, 3.5", 512-byte Sctrs (1.44 MB) */
+#define UZIHD3 0xAF /* 10101111B HD, DD, DS, 3.5", 1024-byte Sctrs (1.76 MB) */
+#define IBMPC5 0xAA /* 10101010B HD, DD, DS, 5.25", 512-byte Sctrs (1.2 MB) */
+#define UZIHD5 0xAB /* 10101011B HD, DD, DS, 5.25", 1024-byte Sctrs (1.44 MB) */
+#define DSQD3 0x2F /* 00101111B MFM, DD, DS, 3.5", 1024-byte Sctrs (800 KB) */
+#define DSDD3 0x2E /* 00101110B MFM, DD, DS, 3.5", 512-byte Sctrs (800 KB) */
+#define DSQD5 0x2B /* 00101011B MFM, DD, DS, 5.25", 1024-byte Sctrs (800 KB) */
+#define DSDD5 0x2A /* 00101010B MFM, DD, DS, 5.25", 512-byte Sctrs (800 KB) */
+
+struct {
+ uint8_t logged; /* logged (0xff), unlogged (0) */
+ uint8_t cbyte0; /* bits 7-4: step rate (4ms), bits 3-0: HUT (240ms) */
+ uint8_t cbyte1; /* head load time in 4ms steps (0=infinite) */
+ uint8_t gap3; /* gap3 (size 512 = 27, 1024 = 13) */
+ uint8_t spt; /* physical sectors per track */
+ uint8_t sector1; /* first sector number */
+ uint8_t format; /* format byte */
+ uint8_t spinup; /* spinup (1/20-secs) */
+ uint8_t curtrk; /* current tranck number */
+ uint8_t ncyl; /* number of cylinders x heads */
+} devfd_dtbl[4] = {
+ { 0, 0xCF, 1, 27, 18, 1, IBMPC3, 10, 0, 160 },
+ { 0, 0xCF, 1, 27, 18, 1, IBMPC3, 10, 0, 160 },
+ { 0, 0xCF, 1, 27, 18, 1, IBMPC3, 10, 0, 160 },
+ { 0, 0xCF, 1, 27, 18, 1, IBMPC3, 10, 0, 160 },
+};
static int fd_transfer(bool rwflag, uint8_t minor, uint8_t rawflag)
{
case 0:
nblocks = 1;
devfd_buffer = udata.u_buf->bf_data;
+ devfd_userbuf = 0;
firstblk = udata.u_buf->bf_blk;
break;
case 1:
- nblocks = udata.u_count >> 9;
+ nblocks = udata.u_count >> BLKSHIFT;
devfd_buffer = udata.u_base;
+ devfd_userbuf = 0xFF;
firstblk = udata.u_offset >> BLKSHIFT;
break;
#ifdef SWAPDEV
case 2:
nblocks = swapcnt >> 9;
devfd_buffer = swapbase;
+ devfd_userbuf = 0xFF;
firstblk = swapblk;
break;
#endif
.z180
; imported symbols
+ .globl map_kernel
+ .globl map_process_always
.globl _devfd_dtbl
; exported sybols
.globl _devfd_sector
.globl _devfd_error
.globl _devfd_buffer
+ .globl _devfd_userbuf
.globl _fd_tick
.include "kernel.def"
MONTIM .equ 250 ; Motor On time (Seconds * TICKSPERSEC)
-; Offsets in Drive Data Table (defined at end of this module)
-oFLG .equ 0 ; 0 = Not Logged, 1 = Drive Logged
-oPRM1 .equ 1 ; Step Rate (B7-4), HUT (3-0)
-oPRM2 .equ 2 ; Hd Load in 4mS steps (0=infinite)
-oGAP3 .equ 3 ; Gap 3 Length for Read
-oSPT .equ 4 ; Sectors-per-Track
-oSEC1 .equ 5 ; First Sector Number
-oFMT .equ 6 ; Bit-mapped Format byte
-oSPIN .equ 7 ; Spinup delay (1/20-secs)
-oTRK .equ 8 ; Current Head Position (Track)
+; Offsets into _devfd_dtbl
+oFLG .equ 0 ; logged: 0 = Not Logged, 1 = Drive Logged
+oPRM1 .equ 1 ; cbyte0: Step Rate (B7-4), HUT (3-0)
+oPRM2 .equ 2 ; cbyte1: Hd Load in 4mS steps (0=infinite)
+oGAP3 .equ 3 ; gap3: Gap 3 Length for Read
+oSPT .equ 4 ; spt: Sectors-per-Track
+oSEC1 .equ 5 ; sector1: First Sector Number
+oFMT .equ 6 ; format: Bit-mapped Format byte
+oSPIN .equ 7 ; spinup: Spinup delay (1/20-secs)
+oTRK .equ 8 ; curtrk: Current Head Position (Track)
+oNCYL .equ 9 ; ncyl: Number of cylinders
+TBLSIZ .equ 10 ; sizeof() entry in _devfd_dtbl
;-------------------------------------------------------------
; Determine if the controller exists and a drive is attached
POP HL
RET
-;-------------------------------------------------------------
-; FDCMD - Send Command to DP-8473 FDC
-; Enter: B = # of Bytes in Command, C = Command Byte
-; HL -> Buffer for Read/Write Data (If Needed)
-; Exit : AF = Status byte
-; Uses : AF. All other registers preserved/unused
-
-FdCmd: PUSH HL ; Save regs (for Exit)
- PUSH BC
- PUSH HL ; save pointer for possible Transfer
- CALL Motor ; Ensure motors are On
- LD HL,#comnd ; Point to Command Block
- LD (HL),C ; command passed in C
- LD C,#DR ; DP8473 Data Port
-OtLoop: CALL WRdy ; Wait for RQM (hoping DIO is Low) (No Ints)
- OUTI ; Output Command bytes to FDC
- JR NZ,OtLoop ; ..loop til all bytes sent
-
- POP HL ; Restore Possible Transfer Addr
-FdCi1: CALL WRdy
- BIT 5,A ; In Execution Phase?
- JR Z,FdcRes ; ..jump if Not to check result
- BIT 6,A ; Write?
- JR NZ,FdCi2 ; ..jump if Not to Read
- OUTI ; Else Write a Byte from (HL) to (C)
- JR FdCi1 ; and check for next
-
-FdCi2: INI ; Read a byte from (C) to (HL)
- JR FdCi1 ; and check for next
-
-FdcRes: LD HL,#st0 ; Point to Status Result area
-IsGo: CALL WRdy
-;;--- CALL _ei ; (Ints Ok now)
- BIT 4,A ; End of Status/Result?
- JR Z,FdcXit ; ..exit if So
- BIT 6,A ; Another byte Ready?
- JR Z,FdcXit ; ..exit if Not
- INI ; Else Read Result/Status Byte
- JR IsGo ; ..loop for next
-
-FdcXit: POP BC ; Restore Regs
- POP HL
- RET
;-------------------------------------------------------------
; Check for Proper Termination of Seek/Recalibrate Actions by
RET NZ ; ..return Ok if Yes
JR WRdyT0 ; ..else loop to try again
-;-------------------------------------------------------------
-; Wait for FDC RQM to become Ready, return DIO status in
-; Zero Flag. Pause before reading status port (~12 mS
-; specified, some assumed in code).
-
-WRdy: ;DI ; No Ints while we are doing I/O
- ; (entry to avoid Disabling Ints)
-WRdy1: LD A,(dlyCnt) ; Get delay count
-WRdy0: DEC A ; count down
- JR NZ,WRdy0 ; for ~6 uS Delay
-WRdyL: IN A,(MSR) ; Read Main Status Register
- BIT 7,A ; Interrupt Present?
- RET NZ ; Return if So
- JR WRdyL ; Else Loop
-
;-------------------------------------------------------------
; Return Pointer to Parameters of selected Drive
; Enter: A = Drive (0..3)
OUT (DCR),A ; and Command!
RET
-;------------------- Data Storage Area -----------------------
-; Disk and Drive parameters are dictated by table entries. While
-; not all parameters are implemented in this module, they may be
-; added as desired. A bit-mapped byte is used defined as:
-
-; D D D D D D D D Format Byte
-; 7 6 5 4 3 2 1 0
-; | | | | | | +-+----- Sector Size: 000=128, 001=256, 010=512, 011=1024 bytes
-; | | | | +-+--------- Disk Size: 00=fixed disk, 01=8", 10=5.25", 11=3.5"
-; | | | +------------- 0 = Normal 300 RPM MFM, 1 = "High-Density" Drive
-; | | +--------------- 0 = Single-Sided, 1 = Double-Sided
-; | +----------------- 0 = Double-Density, 1 = Single-Density
-; +------------------- 0 = 250 kbps (normal MFM), 1 = 500 kbps (Hi-Density)
-
-IBMPC3 .equ 0xAE ; 10101110B ; HD, DD, DS, 3.5", 512-byte Sctrs (1.44 MB)
-UZIHD3 .equ 0xAF ; 10101111B ; HD, DD, DS, 3.5", 1024-byte Sctrs (1.76 MB)
-IBMPC5 .equ 0xAA ; 10101010B ; HD, DD, DS, 5.25", 512-byte Sctrs (1.2 MB)
-UZIHD5 .equ 0xAB ; 10101011B ; HD, DD, DS, 5.25", 1024-byte Sctrs (1.44 MB)
-DSQD3 .equ 0x2F ; 00101111B ; MFM, DD, DS, 3.5", 1024-byte Sctrs (800 KB)
-DSDD3 .equ 0x2E ; 00101110B ; MFM, DD, DS, 3.5", 512-byte Sctrs (800 KB)
-DSQD5 .equ 0x2B ; 00101011B ; MFM, DD, DS, 5.25", 1024-byte Sctrs (800 KB)
-DSDD5 .equ 0x2A ; 00101010B ; MFM, DD, DS, 5.25", 512-byte Sctrs (800 KB)
-
-_devfd_dtbl: ; Drive Param Table. 1 Entry Per Drive.
- .db 0, 0xCF, 1, 27, 18, 1, IBMPC3, 10, 0, 160
- ; | | | | | | | | | +- Number of Cylinders
- ; | | | | | | | | +- Current Track Number
- ; | | | | | | | +- Spinup (1/20-secs)
- ; | | | | | | +-- Format Byte (See above)
- ; | | | | | +------- First Sector Number
- ; | | | | +------- Physical Sectors-Per-Track
- ; | | | +----------- Gap3 (Size 512=27, 1024=13)
- ; | | +---------------- Hd Load in 4mS steps (0=inf)
- ; | +--------------------- Step Rate (B7-4) = 4mS (2's compl)
- ; HUT (B3-0) = 240 mS
- ; +--------------------------- Drive Logged (FF), Unlogged (0)
-TBLSIZ .equ . - _devfd_dtbl
- .db 0, 0xCF, 1, 27, 18, 1, IBMPC3, 10, 0, 160
- .db 0, 0xCF, 1, 27, 18, 1, IBMPC3, 10, 0, 160
- .db 0, 0xCF, 1, 27, 18, 1, IBMPC3, 10, 0, 160
+;-------------------------------------------------------------
+; FDCMD - Send Command to DP-8473 FDC
+; Enter: B = # of Bytes in Command, C = Command Byte
+; HL -> Buffer for Read/Write Data (If Needed)
+; Exit : AF = Status byte
+; Uses : AF. All other registers preserved/unused
-; -->>> NOTE: Do NOT move these next two variables out of sequence !!! <<<--
-motim: .db 0 ; Motor On Time Counter
-mtm: .db 0 ; Floppy Spinup Time down-counter
+FdCmd: PUSH HL ; Save regs (for Exit)
+ PUSH BC
+ PUSH DE
+
+ PUSH HL ; save pointer for possible Transfer
+ CALL Motor ; Ensure motors are On
+ LD HL,#comnd ; Point to Command Block
+ LD (HL),C ; command passed in C
+ LD C,#DR ; DP8473 Data Port
+ LD A,(_devfd_userbuf)
+ LD D,A ; store userbuf flag in D
+OtLoop: CALL WRdy ; Wait for RQM (hoping DIO is Low) (No Ints)
+ OUTI ; Output Command bytes to FDC
+ JR NZ,OtLoop ; ..loop til all bytes sent
+ POP HL ; Restore Possible Transfer Addr
+
+ CALL FdCmdXfer ; Do the data transfer (using code in _COMMONMEM)
+
+ LD HL,#st0 ; Point to Status Result area
+IsGo: CALL WRdy
+ BIT 4,A ; End of Status/Result?
+ JR Z,FdcXit ; ..exit if So
+ BIT 6,A ; Another byte Ready?
+ JR Z,FdcXit ; ..exit if Not
+ INI ; Else Read Result/Status Byte
+ JR IsGo ; ..loop for next
+FdcXit:
+ POP DE ; Restore Regs
+ POP BC
+ POP HL
+ RET
+
+;------------------------------------------------------------
+; COMMON MEMORY
+;------------------------------------------------------------
+ .area _COMMONMEM
+
+; inner section of FdCmd routine, has to touch buffers etc
+FdCmdXfer:
+ BIT 0,D ; Buffer in user memory?
+ CALL NZ, map_process_always
+
+FdCi1: CALL WRdy
+ BIT 5,A ; In Execution Phase?
+ JR Z,FdCmdXferDone ; ... tidy up and return if not
+ BIT 6,A ; Write?
+ JR NZ,FdCi2 ; ... jump if Not to Read
+ OUTI ; Write a Byte from (HL) to (C)
+ JR FdCi1 ; check for next byte
+FdCi2: INI ; Read a byte from (C) to (HL)
+ JR FdCi1 ; check for next byte
+FdCmdXferDone:
+ BIT 0,D ; Buffer in user memory?
+ RET Z ; done if not
+ JP map_kernel ; else remap kernel and return
+
+;-------------------------------------------------------------
+; Wait for FDC RQM to become Ready, return DIO status in
+; Zero Flag. Pause before reading status port (~12 mS
+; specified, some assumed in code).
+
+WRdy:
+WRdy1: LD A,(dlyCnt) ; Get delay count
+WRdy0: DEC A ; count down
+ JR NZ,WRdy0 ; for ~6 uS Delay
+
+WRdyL: IN A,(MSR) ; Read Main Status Register
+ BIT 7,A ; Interrupt Present?
+ RET NZ ; Return if So
+ JR WRdyL ; Else Loop
dlyCnt: .db (CPU_CLOCK_KHZ/1000) ; Delay to avoid over-sampling status register
-;------------------------------------------------------------------------------
+;------------------------------------------------------------
+; DATA MEMORY
+;------------------------------------------------------------
.area _DATA
drive: .ds 1 ; (minor) Currently Selected Drive
active: .ds 1 ; Current bits written to Dev Contr Reg (DCR)
-;;--block: DEFS 1 ; Index in Buffer for desired 512-byte block
-;;--buffer: DEFS 1024 ; Physical Sector Buffer. Max Possible Size
_devfd_sector: .ds 1
_devfd_track: .ds 1 ; LSB used as Head # in DS formats
_devfd_error: .ds 1
_devfd_buffer: .ds 2
+_devfd_userbuf: .ds 1
+; DISK Subsystem Variable Storage
comnd: .ds 1 ; Storage for Command in execution
hdr: .ds 1 ; Head (B2), Drive (B0,1)
trk: .ds 1 ; Track (t)
dtl: .ds 1 ; Data Length
; FDC Operation Result Storage Area
-
st0: .ds 1 ; Status Byte 0
st1: .ds 1 ; Status Byte 1 (can also be PCN)
.ds 1 ; ST2 - Status Byte 2
.ds 1 ; RR - Sector #
.ds 1 ; RN - Sector Size
-actDma: .ds 2 ; 16-bit DMA Address
-
-; DISK Subsystem Variable Storage
+; -->>> NOTE: Do NOT move these next two variables out of sequence !!! <<<--
+motim: .ds 1 ; Motor On Time Counter
+mtm: .ds 1 ; Floppy Spinup Time down-counter
rdOp: .ds 1 ; Read/write flag
retrys: .ds 1 ; Number of times to try Opns
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