source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/Common/HStatus.asm@ 38

Last change on this file since 38 was 34, checked in by Tomi Tilli, 14 years ago

OS hooks are now enabled for all builds.
IRQ waiting no longer uses HLT instruction to fix some EMM386 and VCPI issues.
File size: 7.3 KB
Line 
1; File name : HStatus.asm
2; Project name : IDE BIOS
3; Created date : 15.12.2009
4; Last update : 23.8.2010
5; Author : Tomi Tilli
6; Description : IDE Status Register polling functions.
7
8; Section containing code
9SECTION .text
10
11;--------------------------------------------------------------------
12; Waits Hard Disk IRQ when not transferring data.
13; If interrupts are disabled, RDY flag is polled.
14;
15; HStatus_WaitIrqOrRdy
16; Parameters:
17; DS:BX: Ptr to DPT
18; Returns:
19; AH: BIOS Error code
20; CF: 0 if wait succesfull
21; 1 if any error
22; Corrupts registers:
23; AL, CX, DX
24;--------------------------------------------------------------------
25ALIGN JUMP_ALIGN
26HStatus_WaitIrqOrRdy:
27 call HIRQ_WaitForIRQ
28 jnc SHORT .PollRdySinceNoWaitingOnOsHook
29 jmp HError_ProcessErrorsAfterPollingBSY
30
31ALIGN JUMP_ALIGN
32.PollRdySinceNoWaitingOnOsHook:
33 mov cl, B_TIMEOUT_DRQ ; Load DRQ (not RDY) timeout
34 jmp SHORT HStatus_WaitRdy ; Jump to poll RDY
35
36
37;--------------------------------------------------------------------
38; Waits until Hard Disk is ready to transfer data.
39;
40; HStatus_WaitIrqOrDrq
41; Parameters:
42; DS:BX: Ptr to DPT (in RAMVARS segment)
43; Returns:
44; AH: BIOS Error code
45; CF: 0 if wait succesfull
46; 1 if any error
47; Corrupts registers:
48; AL
49;--------------------------------------------------------------------
50ALIGN JUMP_ALIGN
51HStatus_WaitIrqOrDrq:
52 call HIRQ_WaitForIRQ
53 jnc SHORT .PollDrqSinceNoWaitingOnOsHook
54 jmp HError_ProcessErrorsAfterPollingBSY
55
56ALIGN JUMP_ALIGN
57.PollDrqSinceNoWaitingOnOsHook:
58 push dx
59 push cx
60 call HStatus_WaitDrqDefTime
61 pop cx
62 pop dx
63 ret
64
65
66;--------------------------------------------------------------------
67; Waits until busy flag is cleared from selected Hard Disk drive.
68;
69; HStatus_WaitBsyDefTime Uses default timeout
70; HStatus_WaitBsy Uses user defined timeout
71; HStatus_WaitBsyBase Uses user base port address and timeout
72; Parameters:
73; CL: Timeout value in system timer ticks (not HStatus_WaitBsyDefTime)
74; DX: IDE Base port address (HUtil_WaitBsyBase only)
75; DS: Segment to RAMVARS
76; Returns:
77; AH: BIOS Error code
78; DX: IDE Status Register Address
79; CF: 0 if wait succesfull
80; 1 if any error
81; Corrupts registers:
82; AL, CX
83;--------------------------------------------------------------------
84ALIGN JUMP_ALIGN
85HStatus_WaitBsyDefTime:
86 mov cl, B_TIMEOUT_BSY ; Load timeout value
87ALIGN JUMP_ALIGN
88HStatus_WaitBsy:
89 mov dx, [RAMVARS.wIdeBase] ; Load offset to base port
90ALIGN JUMP_ALIGN
91HStatus_WaitBsyBase:
92 add dx, BYTE REGR_IDE_ST ; Add offset to status reg
93 jmp SHORT HStatus_PollBsy ; Wait until not busy
94
95
96;--------------------------------------------------------------------
97; Waits until Hard Disk is ready to accept commands.
98;
99; HStatus_WaitRdyDefTime Uses default timeout
100; HStatus_WaitRdy Uses user defined timeout
101; HStatus_WaitRdyBase Uses user base port address and timeout
102; Parameters:
103; CL: Timeout value in system timer ticks (not HStatus_WaitRdyDefTime)
104; DX: IDE Base port address (HStatus_WaitRdyBase only)
105; DS: Segment to RAMVARS
106; Returns:
107; AH: BIOS Error code
108; DX: IDE Status Register Address
109; CF: 0 if wait succesfull
110; 1 if any error
111; Corrupts registers:
112; AL, CX
113;--------------------------------------------------------------------
114ALIGN JUMP_ALIGN
115HStatus_WaitRdyDefTime:
116 mov cl, B_TIMEOUT_RDY ; Load timeout value
117ALIGN JUMP_ALIGN
118HStatus_WaitRdy:
119 mov dx, [RAMVARS.wIdeBase] ; Load offset to base port
120ALIGN JUMP_ALIGN
121HStatus_WaitRdyBase:
122 add dx, BYTE REGR_IDE_ST ; Add offset to status reg
123 mov ah, FLG_IDE_ST_DRDY ; Flag to poll
124 jmp SHORT HStatus_PollBsyAndFlg ; Wait until flag set
125
126
127;--------------------------------------------------------------------
128; Waits until Hard Disk is ready to transfer data.
129; Note! This function polls DRQ even if interrupts are enabled!
130;
131; HStatus_WaitDrqDefTime Uses default timeout
132; HStatus_WaitDrq Uses user defined timeout
133; HStatus_WaitDrqBase Uses user base port address and timeout
134; Parameters:
135; CL: Timeout value in system timer ticks (not HStatus_WaitDrqDefTime)
136; DX: IDE Base port address (HStatus_WaitDrqBase only)
137; DS: Segment to RAMVARS
138; Returns:
139; AH: BIOS Error code
140; DX: IDE Status Register Address
141; CF: 0 if wait succesfull
142; 1 if any error
143; Corrupts registers:
144; AL, CX
145;--------------------------------------------------------------------
146ALIGN JUMP_ALIGN
147HStatus_WaitDrqDefTime:
148 mov cl, B_TIMEOUT_DRQ ; Load timeout value
149ALIGN JUMP_ALIGN
150HStatus_WaitDrq:
151 mov dx, [RAMVARS.wIdeBase] ; Load offset to base port
152ALIGN JUMP_ALIGN
153HStatus_WaitDrqBase:
154 add dx, BYTE REGR_IDE_ST ; Add offset to status reg
155 mov ah, FLG_IDE_ST_DRQ ; Flag to poll
156 ; Fall to HStatus_PollBsyAndFlg
157
158;--------------------------------------------------------------------
159; IDE Status register polling.
160; This function first waits until controller is not busy.
161; When not busy, IDE Status Register is polled until wanted flag is set.
162;
163; HStatus_PollBusyAndFlg
164; Parameters:
165; AH: Status Register Flag to poll (until set) when not busy
166; CL: Timeout value in system timer ticks
167; DX: IDE Status Register Address
168; DS: Segment to RAMVARS
169; Returns:
170; AH: BIOS Error code
171; CF: Clear if wait completed successfully (no errors)
172; Set if any error
173; Corrupts registers:
174; AL, CX
175;--------------------------------------------------------------------
176ALIGN JUMP_ALIGN
177HStatus_PollBsyAndFlg:
178 call SoftDelay_InitTimeout ; Initialize timeout counter
179 in al, dx ; Discard contents for first read
180 ; (should read Alternate Status Register)
181ALIGN JUMP_ALIGN
182.PollLoop:
183 in al, dx ; Load IDE Status Register
184 test al, FLG_IDE_ST_BSY ; Controller busy?
185 jnz SHORT .UpdateTimeout ; If so, jump to timeout update
186 test al, ah ; Test secondary flag
187 jnz SHORT GetErrorCodeFromPollingToAH ; If set, break loop
188ALIGN JUMP_ALIGN
189.UpdateTimeout:
190 call SoftDelay_UpdTimeout ; Update timeout counter
191 jnc SHORT .PollLoop ; Loop if time left (sets CF on timeout)
192 jmp HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit
193
194;--------------------------------------------------------------------
195; IDE Status register polling.
196; This function waits until controller is not busy.
197;
198; HStatus_PollBsy
199; Parameters:
200; CL: Timeout value in system timer ticks
201; DX: IDE Status Register Address
202; DS: Segment to RAMVARS
203; Returns:
204; AH: BIOS Error code
205; CF: Clear if wait completed successfully (no errors)
206; Set if any error
207; Corrupts registers:
208; AL, CX
209;--------------------------------------------------------------------
210ALIGN JUMP_ALIGN
211HStatus_PollBsy:
212 call SoftDelay_InitTimeout ; Initialize timeout counter
213 in al, dx ; Discard contents for first read
214 ; (should read Alternate Status Register)
215ALIGN JUMP_ALIGN
216.PollLoop:
217 in al, dx ; Load IDE Status Reg
218 test al, FLG_IDE_ST_BSY ; Controller busy?
219 jz SHORT GetErrorCodeFromPollingToAH ; If not, jump to check errors
220 call SoftDelay_UpdTimeout ; Update timeout counter
221 jnc SHORT .PollLoop ; Loop if time left (sets CF on timeout)
222ALIGN JUMP_ALIGN
223GetErrorCodeFromPollingToAH:
224 jmp HError_ProcessErrorsAfterPollingBSY
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