source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Device/IDE/IdeWait.asm@ 510

Last change on this file since 510 was 491, checked in by krille_n_@…, 12 years ago

Changes:

  • Added a new define (USE_UNDOC_INTEL) that enables optimizations possible by using undocumented instructions available on all Intel processors and truly compatible clones. AFAIK the only exceptions are the NEC V-series and the Sony CXQ70108 processors so this option should be safe for use on the AT builds.
  • Building BIOSDRVS or the BIOS without MODULE_STRINGS_COMPRESSED would fail due to the recent code exclusions so I changed them a bit. Also fixed the mistaken change to Main.asm
  • Changed the Tandy specific info in Configuration_FullMode.txt so it matches the info in the Wiki.
  • Optimizations and fixes in general.
File size: 4.6 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : IDE Device wait functions.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
7;
8; This program is free software; you can redistribute it and/or modify
9; it under the terms of the GNU General Public License as published by
10; the Free Software Foundation; either version 2 of the License, or
11; (at your option) any later version.
12;
13; This program is distributed in the hope that it will be useful,
14; but WITHOUT ANY WARRANTY; without even the implied warranty of
15; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16; GNU General Public License for more details.
17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
19
20; Section containing code
21SECTION .text
22
23;--------------------------------------------------------------------
24; IdeWait_IRQorDRQ
25; Parameters:
26; DS:DI: Ptr to DPT (in RAMVARS segment)
27; SS:BP: Ptr to IDEPACK, PIOVARS or MEMPIOVARS
28; Returns:
29; AH: INT 13h Error Code
30; CF: Cleared if success, Set if error
31; Corrupts registers:
32; AL, BX, CX, DX
33;--------------------------------------------------------------------
34IdeWait_IRQorDRQ:
35 mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
36
37%ifdef MODULE_IRQ
38 test BYTE [bp+IDEPACK.bDeviceControl], FLG_DEVCONTROL_nIEN
39 jnz SHORT IdeWait_PollStatusFlagInBLwithTimeoutInBH ; Interrupt disabled
40%endif
41 ; Fall to IdeWait_IRQorStatusFlagInBLwithTimeoutInBH
42
43
44;--------------------------------------------------------------------
45; IdeWait_IRQorStatusFlagInBLwithTimeoutInBH
46; Parameters:
47; BH: Timeout ticks
48; BL: IDE Status Register bit to wait
49; DS:DI: Ptr to DPT (in RAMVARS segment)
50; Returns:
51; AH: INT 13h Error Code
52; CF: Cleared if success, Set if error
53; Corrupts registers:
54; AL, BX, CX, DX
55;--------------------------------------------------------------------
56IdeWait_IRQorStatusFlagInBLwithTimeoutInBH:
57%ifdef MODULE_IRQ
58 call IdeIrq_WaitForIRQ
59%endif
60 ; Always fall to IdeWait_PollStatusFlagInBLwithTimeoutInBH for error processing
61
62
63;--------------------------------------------------------------------
64; IdeWait_PollStatusFlagInBLwithTimeoutInBH
65; Parameters:
66; BH: Timeout ticks
67; BL: IDE Status Register bit to poll
68; DS:DI: Ptr to DPT (in RAMVARS segment)
69; Returns:
70; AH: INT 13h Error Code
71; CF: Cleared if success, Set if error
72; Corrupts registers:
73; AL, BX, CX, DX
74;--------------------------------------------------------------------
75IdeWait_PollStatusFlagInBLwithTimeoutInBH:
76 mov ah, bl
77 mov cl, bh
78 call Timer_InitializeTimeoutWithTicksInCL
79 and ah, ~FLG_STATUS_BSY
80 jz SHORT PollBsyOnly
81 ; Fall to PollBsyAndFlgInAH
82
83;--------------------------------------------------------------------
84; PollBsyAndFlgInAH
85; Parameters:
86; AH: Status Register Flag to poll (until set) when device not busy
87; DS:DI: Ptr to DPT (in RAMVARS segment)
88; Returns:
89; AH: BIOS Error code
90; CF: Clear if wait completed successfully (no errors)
91; Set if any error
92; Corrupts registers:
93; AL, BX, CX, DX
94;--------------------------------------------------------------------
95PollBsyAndFlgInAH:
96 call IdeIO_InputStatusRegisterToAL ; Discard contents of first read
97
98.PollLoop:
99 call IdeIO_InputStatusRegisterToAL
100 test al, FLG_STATUS_BSY ; Controller busy?
101 jnz SHORT .UpdateTimeout ; If so, jump to timeout update
102 test al, ah ; Test secondary flag
103 jnz SHORT IdeError_GetBiosErrorCodeToAHfromPolledStatusRegisterInAL
104.UpdateTimeout:
105 call Timer_SetCFifTimeout
106 jnc SHORT .PollLoop ; Loop if time left
107 call IdeError_GetBiosErrorCodeToAHfromPolledStatusRegisterInAL
108 jc SHORT .ReturnErrorCodeInAH
109 mov ah, RET_HD_TIMEOUT ; Expected bit never got set
110 stc
111.ReturnErrorCodeInAH:
112 ret
113
114
115;--------------------------------------------------------------------
116; PollBsyOnly
117; Parameters:
118; DS:DI: Ptr to DPT (in RAMVARS segment)
119; Returns:
120; AH: BIOS Error code
121; CF: Clear if wait completed successfully (no errors)
122; Set if any error
123; Corrupts registers:
124; AL, BX, CX, DX
125;--------------------------------------------------------------------
126PollBsyOnly:
127 call IdeIO_InputStatusRegisterToAL ; Discard contents of first read
128
129.PollLoop:
130 call IdeIO_InputStatusRegisterToAL
131 test al, FLG_STATUS_BSY ; Controller busy?
132 jz SHORT IdeError_GetBiosErrorCodeToAHfromPolledStatusRegisterInAL
133 call Timer_SetCFifTimeout ; Update timeout counter
134 jnc SHORT .PollLoop ; Loop if time left (sets CF on timeout)
135 jmp SHORT IdeError_GetBiosErrorCodeToAHfromPolledStatusRegisterInAL
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