source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/CustomDPT.inc @ 236

Last change on this file since 236 was 236, checked in by aitotat@…, 11 years ago

Changes to XTIDE Universal BIOS:

  • Restored lost alignment byte to DPT struct.
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                                resb    1   ; Alignment
15
16    ; IDE Drive related
17    ; .twLbaSectors is used for LBA addressing only.
18    ; .wPchsCylinders and .bPchsSectors are used for CHS addressing only.
19    .bLbaHeads:                             ; Number of LBA assisted heads (1...255)
20    .twLbaSectors               resb    2   ; 48-bit sector count for LBA addressing
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)
25endstruc
26
27; DPT for ATA devices
28struc 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
35endstruc
36
37%ifdef MODULE_SERIAL
38; DPT for Serial devices
39struc 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
45endstruc
46%endif
47
48LARGEST_DPT_SIZE                EQU     DPT_ATA_size
49
50
51; Bit definitions for DPT.bFlagsLow
52MASKL_DPT_CHS_SHIFT_COUNT       EQU (7<<0)  ; Bits 0...3, P-CHS to L-CHS bit shift count (0...4)
53FLGL_DPT_SLAVE                  EQU FLG_DRVNHEAD_DRV    ; (1<<4), Drive is slave drive
54MASKL_DPT_ADDRESSING_MODE       EQU (3<<5)  ; Bits 5..6, Addressing Mode (bit 6 == FLG_DRVNHEAD_LBA)
55FLGL_DPT_ENABLE_IRQ             EQU (1<<7)
56
57; Bit definitions for DPT.bFlagsHigh
58FLGH_DPT_REVERSED_A0_AND_A3     EQU (1<<0)  ; XTIDE mod, Address lines 0 and 3 reversed
59FLGH_DPT_BLOCK_MODE_SUPPORTED   EQU (1<<1)  ; Use block transfer commands (must be bit 1!)
60%ifdef MODULE_SERIAL
61FLGH_DPT_SERIAL_DEVICE          EQU (1<<2)  ; Serial Port Device
62%endif
63FLGH_DPT_INTERRUPT_IN_SERVICE   EQU (1<<3)  ; Set when waiting for IRQ
64FLGH_DPT_RESET_nDRDY            EQU (1<<4)  ; Drive ready to accept commands
65FLGH_DPT_RESET_nINITPRMS        EQU (1<<5)  ; Initialize Device Parameters successfull
66FLGH_DPT_RESET_nRECALIBRATE     EQU (1<<6)  ; Recalibrate successfull
67FLGH_DPT_RESET_nSETBLOCK        EQU (1<<7)  ; Initialize Block Mode successfull
68MASKH_DPT_RESET                 EQU 0F0h
69
70; Addressing modes for DPT.wFlags
71ADDRESSING_MODE_FIELD_POSITION  EQU     5
72ADDRESSING_MODE_LCHS            EQU     0   ; L-CHS Addressing Mode (NORMAL in many other BIOSes)
73ADDRESSING_MODE_PCHS            EQU     1   ; P-CHS Addressing Mode (LARGE in many other BIOSes)
74ADDRESSING_MODE_LBA28           EQU     2   ; 28-bit LBA Addressing Mode
75ADDRESSING_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)
79MAX_LCHS_CYLINDERS              EQU     1024
80LBA_ASSIST_SPT                  EQU     63
81
82
83%endif ; CUSTOMDPT_INC
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