source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/CustomDPT.inc @ 227

Last change on this file since 227 was 227, checked in by aitotat@…, 11 years ago

Changes to XTIDE Universal BIOS:

  • EBIOS functions now work in lite mode.
File size: 3.2 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
15    ; IDE Drive related
16    ; .twLbaSectors is used for LBA addressing only.
17    ; .wPchsCylinders and .bPchsSectors are used for CHS addressing only.
18    .bLbaHeads:                             ; Number of LBA assisted heads (1...255)
19    .twLbaSectors               resb    2   ; 48-bit sector count for LBA addressing
20    .wPchsCylinders             resb    2   ; Number of P-CHS Cylinders (1...16383)
21    .wPchsHeadsAndSectors:
22    .bPchsHeads                 resb    1   ; Number of P-CHS heads (1...16)
23    .bPchsSectors               resb    1   ; Number of P-CHS Sectors per Track (1...63)
24endstruc
25
26; DPT for ATA devices
27struc DPT_ATA   ; 10 + 2 bytes = 12 bytes
28    .dpt                        resb    DPT_size
29
30    ; Block size is specified in sectors (1, 2, 4, 8, 16, 32 or 64).
31    ; 128 is not allowed to prevent offset overflow during data transfer.
32    .wSetAndMaxBlock:
33    .bSetBlock                  resb    1   ; Current block size (at least 1)
34    .bMaxBlock                  resb    1   ; Maximum block size, 0 = block mode not supported
35endstruc
36
37%ifdef MODULE_SERIAL
38; DPT for Serial devices
39struc DPT_SERIAL
40    .dpt                        resb    DPT_size
41
42    .bSerialPortAndBaud         resb    1   ; Packed I/O port and baud rate for serial drives
43                                resb    1   ; unused alignment
44endstruc
45%endif
46
47LARGEST_DPT_SIZE                EQU     DPT_ATA_size
48
49
50; Bit definitions for DPT.bFlagsLow
51MASKL_DPT_CHS_SHIFT_COUNT       EQU (7<<0)  ; Bits 0...3, P-CHS to L-CHS bit shift count (0...4)
52FLGL_DPT_SLAVE                  EQU FLG_DRVNHEAD_DRV    ; (1<<4), Drive is slave drive
53MASKL_DPT_ADDRESSING_MODE       EQU (3<<5)  ; Bits 5..6, Addressing Mode (bit 6 == FLG_DRVNHEAD_LBA)
54FLGL_DPT_ENABLE_IRQ             EQU (1<<7)
55
56; Bit definitions for DPT.bFlagsHigh
57FLGH_DPT_REVERSED_A0_AND_A3     EQU (1<<0)  ; XTIDE mod, Address lines 0 and 3 reversed
58FLGH_DPT_BLOCK_MODE_SUPPORTED   EQU (1<<1)  ; Use block transfer commands (must be bit 1!)
59%ifdef MODULE_SERIAL
60FLGH_DPT_SERIAL_DEVICE          EQU (1<<2)  ; Serial Port Device
61%endif
62FLGH_DPT_INTERRUPT_IN_SERVICE   EQU (1<<3)  ; Set when waiting for IRQ
63FLGH_DPT_RESET_nDRDY            EQU (1<<4)  ; Drive ready to accept commands
64FLGH_DPT_RESET_nINITPRMS        EQU (1<<5)  ; Initialize Device Parameters successfull
65FLGH_DPT_RESET_nRECALIBRATE     EQU (1<<6)  ; Recalibrate successfull
66FLGH_DPT_RESET_nSETBLOCK        EQU (1<<7)  ; Initialize Block Mode successfull
67MASKH_DPT_RESET                 EQU 0F0h
68
69; Addressing modes for DPT.wFlags
70ADDRESSING_MODE_FIELD_POSITION  EQU     5
71ADDRESSING_MODE_LCHS            EQU     0   ; L-CHS Addressing Mode (NORMAL in many other BIOSes)
72ADDRESSING_MODE_PCHS            EQU     1   ; P-CHS Addressing Mode (LARGE in many other BIOSes)
73ADDRESSING_MODE_LBA28           EQU     2   ; 28-bit LBA Addressing Mode
74ADDRESSING_MODE_LBA48           EQU     3   ; 48-bit LBA Addressing Mode
75
76; Number of Sectors per Track is fixed to 63 for LBA assist calculation.
77; 1024 cylinders, 256 heads, 63 sectors = 8.4 GB limit (but DOS does not support more than 255 heads)
78MAX_LCHS_CYLINDERS              EQU     1024
79LBA_ASSIST_SPT                  EQU     63
80
81
82%endif ; CUSTOMDPT_INC
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