1 | ; Project name : XTIDE Universal BIOS |
---|
2 | ; Description : Defines for DPT structs containing custom |
---|
3 | ; Disk Parameter Table used by this BIOS. |
---|
4 | %ifndef CUSTOMDPT_INC |
---|
5 | %define CUSTOMDPT_INC |
---|
6 | |
---|
7 | ; Base DPT for all device types |
---|
8 | struc DPT ; 10 bytes |
---|
9 | ; General Disk Parameter Table related |
---|
10 | .wFlags: |
---|
11 | .bFlagsLow resb 1 |
---|
12 | .bFlagsHigh resb 1 |
---|
13 | .bIdevarsOffset resb 1 ; Offset to IDEVARS for this drive |
---|
14 | |
---|
15 | ; IDE Drive related |
---|
16 | ; .bLbaHeads and .twLbaSectors are used for LBA addressing only. |
---|
17 | .bLbaHeads: resb 1 ; Number of LBA assisted heads (1...255) |
---|
18 | .twLbaSectors resb 2 ; 48-bit sector count for LBA addressing |
---|
19 | |
---|
20 | ; .wPchsCylinders and .bPchsSectors are used for CHS addressing only. |
---|
21 | .wPchsCylinders resb 2 ; Number of P-CHS Cylinders (1...16383) |
---|
22 | .wPchsHeadsAndSectors: |
---|
23 | .bPchsHeads resb 1 ; Number of P-CHS heads (1...16) |
---|
24 | .bPchsSectors resb 1 ; Number of P-CHS Sectors per Track (1...63) |
---|
25 | endstruc |
---|
26 | |
---|
27 | ; DPT for ATA devices |
---|
28 | struc DPT_ATA ; 10 + 2 bytes = 12 bytes |
---|
29 | .dpt resb DPT_size |
---|
30 | |
---|
31 | ; Block size is specified in sectors (1, 2, 4, 8, 16, 32, 64 or 128) |
---|
32 | .wSetAndMaxBlock: |
---|
33 | .bSetBlock resb 1 ; Current block size (at least 1) |
---|
34 | .bMaxBlock resb 1 ; Maximum block size, 0 = block mode not supported |
---|
35 | endstruc |
---|
36 | |
---|
37 | %ifdef MODULE_SERIAL |
---|
38 | ; DPT for Serial devices |
---|
39 | struc DPT_SERIAL |
---|
40 | .dpt resb DPT_size |
---|
41 | |
---|
42 | .wSerialPortAndBaud: |
---|
43 | .bSerialPort resb 1 ; Serial connection I/O port address, divided by 4 |
---|
44 | .bSerialBaud resb 1 ; Serial connection baud rate divisor |
---|
45 | endstruc |
---|
46 | %endif |
---|
47 | |
---|
48 | LARGEST_DPT_SIZE EQU DPT_ATA_size |
---|
49 | |
---|
50 | |
---|
51 | ; Bit definitions for DPT.bFlagsLow |
---|
52 | MASKL_DPT_CHS_SHIFT_COUNT EQU (7<<0) ; Bits 0...3, P-CHS to L-CHS bit shift count (0...4) |
---|
53 | FLGL_DPT_SLAVE EQU FLG_DRVNHEAD_DRV ; (1<<4), Drive is slave drive |
---|
54 | MASKL_DPT_ADDRESSING_MODE EQU (3<<5) ; Bits 5..6, Addressing Mode (bit 6 == FLG_DRVNHEAD_LBA) |
---|
55 | FLGL_DPT_ENABLE_IRQ EQU (1<<7) |
---|
56 | |
---|
57 | ; Bit definitions for DPT.bFlagsHigh |
---|
58 | FLGH_DPT_REVERSED_A0_AND_A3 EQU (1<<0) ; XTIDE mod, Address lines 0 and 3 reversed |
---|
59 | FLGH_DPT_BLOCK_MODE_SUPPORTED EQU (1<<1) ; Use block transfer commands (must be bit 1!) |
---|
60 | %ifdef MODULE_SERIAL |
---|
61 | FLGH_DPT_SERIAL_DEVICE EQU (1<<2) ; Serial Port Device |
---|
62 | %endif |
---|
63 | FLGH_DPT_INTERRUPT_IN_SERVICE EQU (1<<3) ; Set when waiting for IRQ |
---|
64 | FLGH_DPT_RESET_nDRDY EQU (1<<4) ; Drive ready to accept commands |
---|
65 | FLGH_DPT_RESET_nINITPRMS EQU (1<<5) ; Initialize Device Parameters successfull |
---|
66 | FLGH_DPT_RESET_nRECALIBRATE EQU (1<<6) ; Recalibrate successfull |
---|
67 | FLGH_DPT_RESET_nSETBLOCK EQU (1<<7) ; Initialize Block Mode successfull |
---|
68 | MASKH_DPT_RESET EQU 0F0h |
---|
69 | |
---|
70 | ; Addressing modes for DPT.wFlags |
---|
71 | ADDRESSING_MODE_FIELD_POSITION EQU 5 |
---|
72 | ADDRESSING_MODE_LCHS EQU 0 ; L-CHS Addressing Mode (NORMAL in many other BIOSes) |
---|
73 | ADDRESSING_MODE_PCHS EQU 1 ; P-CHS Addressing Mode (LARGE in many other BIOSes) |
---|
74 | ADDRESSING_MODE_LBA28 EQU 2 ; 28-bit LBA Addressing Mode |
---|
75 | ADDRESSING_MODE_LBA48 EQU 3 ; 48-bit LBA Addressing Mode |
---|
76 | |
---|
77 | ; Number of Sectors per Track is fixed to 63 for LBA assist calculation. |
---|
78 | ; 1024 cylinders, 256 heads, 63 sectors = 8.4 GB limit (but DOS does not support more than 255 heads) |
---|
79 | MAX_LCHS_CYLINDERS EQU 1024 |
---|
80 | LBA_ASSIST_SPT EQU 63 |
---|
81 | |
---|
82 | |
---|
83 | %endif ; CUSTOMDPT_INC |
---|