source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/Idepack.asm@ 209

Last change on this file since 209 was 181, checked in by krille_n_@…, 13 years ago

Changes to all parts of the project:

  • Size optimizations.
  • Added a define (EXCLUDE_FROM_XTIDECFG) to exclude unused library code from XTIDECFG.
  • Tried to minimize time spent with interrupts disabled.
  • Some minor attempts to improve speed (reordering instructions etc).
  • Tried to improve readability, did some cleanup and fixed some errors in comments.
File size: 4.8 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Functions for managing IDEPACK struct.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Idepack_FakeToSSBP
9; Parameters:
10; Nothing
11; Returns:
12; SS:BP: Ptr to IDEPACK
13; Corrupts registers:
14; AX
15;--------------------------------------------------------------------
16Idepack_FakeToSSBP:
17 pop ax
18 sub sp, BYTE EXTRA_BYTES_FOR_INTPACK
19 mov bp, sp
20 jmp ax
21
22
23;--------------------------------------------------------------------
24; Idepack_ConvertDapToIdepackAndIssueCommandFromAH
25; Parameters:
26; AH: IDE command to issue
27; BH: Timeout ticks
28; BL: IDE Status Register flag to wait after command
29; DS:DI: Ptr to DPT (in RAMVARS segment)
30; ES:SI: Ptr to DAP (EBIOS Disk Address Packet)
31; SS:BP: Ptr to IDEPACK
32; Returns:
33; AH: INT 13h Error Code
34; CF: Cleared if success, Set if error
35; Corrupts registers:
36; AL, BX, CX, DX, SI, ES
37;--------------------------------------------------------------------
38%ifdef MODULE_EBIOS
39ALIGN JUMP_ALIGN
40Idepack_ConvertDapToIdepackAndIssueCommandFromAH:
41 mov [bp+IDEPACK.bCommand], ah
42 mov ax, [es:si+DAP.wSectorCount]
43 mov [bp+IDEPACK.bSectorCount], al
44 mov [bp+IDEPACK.bSectorCountHighExt], ah
45
46 mov al, [es:si+DAP.qwLBA] ; LBA byte 0
47 mov [bp+IDEPACK.bLbaLow], al
48 mov ax, [es:si+DAP.qwLBA+1] ; LBA bytes 1 and 2
49 mov [bp+IDEPACK.wLbaMiddleAndHigh], ax
50 mov ah, [es:si+DAP.qwLBA+3] ; LBA byte 3, LBA28 bits 24...27
51 mov [bp+IDEPACK.bLbaLowExt], ah
52 mov cx, [es:si+DAP.qwLBA+4] ; LBA bytes 4 and 5
53 mov [bp+IDEPACK.wLbaMiddleAndHighExt], cx
54
55 and ah, 0Fh ; Limit bits for LBA28
56 call AccessDPT_GetDriveSelectByteToAL
57 or al, ah
58 mov [bp+IDEPACK.bDrvAndHead], al
59 les si, [es:si+DAP.dwMemoryAddress]
60 jmp SHORT GetDeviceControlByteToIdepackAndStartTransfer
61%endif
62
63
64;--------------------------------------------------------------------
65; Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
66; Parameters:
67; AH: IDE command to issue
68; AL: Number of sectors to transfer (1...255, 0=256)
69; BH: Timeout ticks
70; BL: IDE Status Register flag to wait after command
71; CH: Cylinder number, bits 7...0
72; CL: Bits 7...6: Cylinder number bits 9 and 8
73; Bits 5...0: Starting sector number (1...63)
74; DH: Starting head number (0...255)
75; ES:SI: Ptr to data buffer
76; DS:DI: Ptr to DPT (in RAMVARS segment)
77; SS:BP: Ptr to IDEPACK
78; Returns:
79; AH: INT 13h Error Code
80; CF: Cleared if success, Set if error
81; Corrupts registers:
82; AL, BX, CX, DX
83;--------------------------------------------------------------------
84ALIGN JUMP_ALIGN
85Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH:
86 mov [bp+IDEPACK.bCommand], ah
87
88 xor ah, ah
89 cmp ah, al
90 cmc
91 adc ah, ah
92
93 mov [bp+IDEPACK.bSectorCount], al
94 mov [bp+IDEPACK.bSectorCountHighExt], ah
95
96 push bx
97 call Address_OldInt13hAddressToIdeAddress
98 call AccessDPT_GetDriveSelectByteToAL
99 or al, bh ; AL now has Drive and Head Select Byte
100 mov [bp+IDEPACK.bDrvAndHead], al
101 mov [bp+IDEPACK.bLbaLow], bl
102 mov [bp+IDEPACK.wLbaMiddleAndHigh], cx
103 pop bx
104
105GetDeviceControlByteToIdepackAndStartTransfer:
106 call AccessDPT_GetDeviceControlByteToAL
107 mov [bp+IDEPACK.bDeviceControl], al
108 jmp Device_OutputCommandWithParameters
109
110
111;--------------------------------------------------------------------
112; Idepack_StoreNonExtParametersAndIssueCommandFromAL
113; Parameters:
114; BH: Timeout ticks
115; BL: IDE Status Register flag to wait after command
116; AL: IDE command to issue
117; AH: Parameter to Drive and Head Select Register (Head bits only)
118; DL: Parameter to Sector Count Register
119; DH: Parameter to LBA Low / Sector Number Register
120; CL: Parameter to LBA Middle / Cylinder Low Register
121; CH: Parameter to LBA High / Cylinder High Register
122; SI: Parameter to Features Register
123; DS:DI: Ptr to DPT (in RAMVARS segment)
124; SS:BP: Ptr to IDEPACK
125; Returns:
126; AH: INT 13h Error Code
127; CF: Cleared if success, Set if error
128; Corrupts registers:
129; AL, BX, CX, DX
130;--------------------------------------------------------------------
131ALIGN JUMP_ALIGN
132Idepack_StoreNonExtParametersAndIssueCommandFromAL:
133 mov [bp+IDEPACK.bFeatures], si
134 mov [bp+IDEPACK.bCommand], al
135 mov [bp+IDEPACK.wSectorCountAndLbaLow], dx
136 mov [bp+IDEPACK.wLbaMiddleAndHigh], cx
137 mov BYTE [bp+IDEPACK.bSectorCountHighExt], 0
138
139 ; Drive and Head select byte
140 and ah, MASK_DRVNHEAD_HEAD ; Keep head bits only
141 call AccessDPT_GetDriveSelectByteToAL
142 or al, ah
143 mov [bp+IDEPACK.bDrvAndHead], al
144
145 ; Device Control byte with interrupts disabled
146 call AccessDPT_GetDeviceControlByteToAL
147 or al, FLG_DEVCONTROL_nIEN ; Disable interrupt
148 mov [bp+IDEPACK.bDeviceControl], al
149
150 jmp Device_OutputCommandWithParameters
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