source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/CustomDPT.inc @ 175

Last change on this file since 175 was 175, checked in by gregli@…, 11 years ago

ifdef of existing serial code, in preperation for checkin

File size: 2.8 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%ifdef MODULE_SERIAL
15    .bSerialPortAndBaud         resb    1   ; Packed I/O port and baud rate for serial drives
16%else
17                                resb    1   ; without serial port support, alignment byte
18%endif
19
20    ; IDE Drive related
21    .dwCylinders                resb    4   ; Number of Cylinders
22    .wHeadsAndSectors:
23    .bHeads                     resb    1   ; Number of Heads (1...255)
24    .bSectors                   resb    1   ; Number of 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 or 64).
32    ; 128 is not allowed to prevent offset overflow during data transfer.
33    .wSetAndMaxBlock:
34    .bSetBlock                  resb    1   ; Current block size (at least 1)
35    .bMaxBlock                  resb    1   ; Maximum block size, 0 = block mode not supported
36endstruc
37
38LARGEST_DPT_SIZE                EQU     DPT_ATA_size
39
40
41; Bit definitions for DPT.bFlagsLow
42MASKL_DPT_CHS_SHIFT_COUNT       EQU (7<<0)  ; Bits 0...3, P-CHS to L-CHS bit shift count (0...4)
43FLGL_DPT_SLAVE                  EQU FLG_DRVNHEAD_DRV    ; (1<<4), Drive is slave drive
44MASKL_DPT_ADDRESSING_MODE       EQU (3<<5)  ; Bits 5..6, Addressing Mode (bit 6 == FLG_DRVNHEAD_LBA)
45FLGL_DPT_ENABLE_IRQ             EQU (1<<7)
46
47; Bit definitions for DPT.bFlagsHigh
48FLGH_DPT_REVERSED_A0_AND_A3     EQU (1<<0)  ; XTIDE mod, Address lines 0 and 3 reversed
49FLGH_DPT_BLOCK_MODE_SUPPORTED   EQU (1<<1)  ; Use block transfer commands (must be bit 1!)
50%ifdef MODULE_SERIAL
51FLGH_DPT_SERIAL_DEVICE          EQU (1<<2)  ; Serial Port Device
52%endif
53FLGH_DPT_INTERRUPT_IN_SERVICE   EQU (1<<3)  ; Set when waiting for IRQ
54FLGH_DPT_RESET_nDRDY            EQU (1<<4)  ; Drive ready to accept commands
55FLGH_DPT_RESET_nINITPRMS        EQU (1<<5)  ; Initialize Device Parameters successfull
56FLGH_DPT_RESET_nRECALIBRATE     EQU (1<<6)  ; Recalibrate successfull
57FLGH_DPT_RESET_nSETBLOCK        EQU (1<<7)  ; Initialize Block Mode successfull
58MASKH_DPT_RESET                 EQU 0F0h
59
60; Addressing modes for DPT.wFlags
61ADDRESSING_MODE_FIELD_POSITION  EQU     5
62ADDRESSING_MODE_LCHS            EQU     0   ; L-CHS Addressing Mode (NORMAL in many other BIOSes)
63ADDRESSING_MODE_PCHS            EQU     1   ; P-CHS Addressing Mode (LARGE in many other BIOSes)
64ADDRESSING_MODE_LBA28           EQU     2   ; 28-bit LBA Addressing Mode
65ADDRESSING_MODE_LBA48           EQU     3   ; 48-bit LBA Addressing Mode
66
67; Number of Sectors per Track is fixed to 63 for LBA assist calculation.
68; 1024 cylinders, 256 heads, 63 sectors = 8.4 GB limit (but DOS does not support more than 255 heads)
69MAX_LCHS_CYLINDERS              EQU     1024
70LBA_ASSIST_SPT                  EQU     63
71
72
73%endif ; CUSTOMDPT_INC
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