source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/CustomDPT.inc @ 226

Last change on this file since 226 was 226, checked in by gregli@…, 11 years ago

Moved .bSerialPortAndBaud out of the main DPT into a an attached struc DPT_SERIAL, used by the serial port code only

File size: 2.9 KB
Line 
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
8struc 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                                resb    1   ; alignment byte
15
16    ; IDE Drive related
17    .dwCylinders                resb    4   ; Number of Cylinders
18    .wHeadsAndSectors:
19    .bHeads                     resb    1   ; Number of Heads (1...255)
20    .bSectors                   resb    1   ; Number of Sectors per Track (1...63)
21endstruc
22
23; DPT for ATA devices
24struc DPT_ATA   ; 10 + 2 bytes = 12 bytes
25    .dpt                        resb    DPT_size
26
27    ; Block size is specified in sectors (1, 2, 4, 8, 16, 32 or 64).
28    ; 128 is not allowed to prevent offset overflow during data transfer.
29    .wSetAndMaxBlock:
30    .bSetBlock                  resb    1   ; Current block size (at least 1)
31    .bMaxBlock                  resb    1   ; Maximum block size, 0 = block mode not supported
32endstruc
33
34%ifdef MODULE_SERIAL
35; DPT for Serial devices
36struc DPT_SERIAL
37    .dpt                        resb    DPT_size
38
39    .bSerialPortAndBaud         resb    1   ; Packed I/O port and baud rate for serial drives
40                                resb    1   ; unused alignment
41endstruc
42%endif
43
44LARGEST_DPT_SIZE                EQU     DPT_ATA_size
45
46
47; Bit definitions for DPT.bFlagsLow
48MASKL_DPT_CHS_SHIFT_COUNT       EQU (7<<0)  ; Bits 0...3, P-CHS to L-CHS bit shift count (0...4)
49FLGL_DPT_SLAVE                  EQU FLG_DRVNHEAD_DRV    ; (1<<4), Drive is slave drive
50MASKL_DPT_ADDRESSING_MODE       EQU (3<<5)  ; Bits 5..6, Addressing Mode (bit 6 == FLG_DRVNHEAD_LBA)
51FLGL_DPT_ENABLE_IRQ             EQU (1<<7)
52
53; Bit definitions for DPT.bFlagsHigh
54FLGH_DPT_REVERSED_A0_AND_A3     EQU (1<<0)  ; XTIDE mod, Address lines 0 and 3 reversed
55FLGH_DPT_BLOCK_MODE_SUPPORTED   EQU (1<<1)  ; Use block transfer commands (must be bit 1!)
56%ifdef MODULE_SERIAL
57FLGH_DPT_SERIAL_DEVICE          EQU (1<<2)  ; Serial Port Device
58%endif
59FLGH_DPT_INTERRUPT_IN_SERVICE   EQU (1<<3)  ; Set when waiting for IRQ
60FLGH_DPT_RESET_nDRDY            EQU (1<<4)  ; Drive ready to accept commands
61FLGH_DPT_RESET_nINITPRMS        EQU (1<<5)  ; Initialize Device Parameters successfull
62FLGH_DPT_RESET_nRECALIBRATE     EQU (1<<6)  ; Recalibrate successfull
63FLGH_DPT_RESET_nSETBLOCK        EQU (1<<7)  ; Initialize Block Mode successfull
64MASKH_DPT_RESET                 EQU 0F0h
65
66; Addressing modes for DPT.wFlags
67ADDRESSING_MODE_FIELD_POSITION  EQU     5
68ADDRESSING_MODE_LCHS            EQU     0   ; L-CHS Addressing Mode (NORMAL in many other BIOSes)
69ADDRESSING_MODE_PCHS            EQU     1   ; P-CHS Addressing Mode (LARGE in many other BIOSes)
70ADDRESSING_MODE_LBA28           EQU     2   ; 28-bit LBA Addressing Mode
71ADDRESSING_MODE_LBA48           EQU     3   ; 48-bit LBA Addressing Mode
72
73; Number of Sectors per Track is fixed to 63 for LBA assist calculation.
74; 1024 cylinders, 256 heads, 63 sectors = 8.4 GB limit (but DOS does not support more than 255 heads)
75MAX_LCHS_CYLINDERS              EQU     1024
76LBA_ASSIST_SPT                  EQU     63
77
78
79%endif ; CUSTOMDPT_INC
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