source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm@ 559

Last change on this file since 559 was 558, checked in by krille_n_@…, 11 years ago

Changes:

  • Building the BIOS Drive Information Tool now works again.
  • Moved all XT-CF related code to MODULE_8BIT_IDE_ADVANCED. I don't see how an XT-CF card could work without *_ADVANCED anyway but if I'm wrong, feel free to undo this. Note! The autodetection code in XTIDECFG has NOT been changed to reflect this (still relies on MODULE_8BIT_IDE).
  • Optimizations and fixes in general.
File size: 16.1 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Int 13h BIOS functions (Floppy and Hard disk).
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 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; Int 13h software interrupt handler.
25; This handler changes stack to top of stolen conventional memory
26; and then calls the actual INT 13h handler (Int13h_DiskFunctionsHandler).
27;
28; Int13h_DiskFunctionsHandlerWithStackChange
29; Parameters:
30; AH: Bios function
31; DL: Drive number
32; Other: Depends on function
33; Returns:
34; Depends on function
35;--------------------------------------------------------------------
36%ifdef RELOCATE_INT13H_STACK
37ALIGN JUMP_ALIGN
38Int13h_DiskFunctionsHandlerWithStackChange:
39 sti ; Enable interrupts
40 ; TODO: Maybe we need to save Flags (DF) as well?
41 push ds ; Save DS:DI on the original stack
42 push di
43 call RamVars_GetSegmentToDS
44
45 ; Store entry registers to RAMVARS
46%ifdef USE_386
47 pop DWORD [RAMVARS.dwStackChangeDSDI]
48%else
49 pop WORD [RAMVARS.wStackChangeDI] ; Pop DS:DI to the top of what
50 pop WORD [RAMVARS.wStackChangeDS] ; is to become the new stack
51%endif
52 mov [RAMVARS.fpInt13hEntryStack], sp
53 mov [RAMVARS.fpInt13hEntryStack+2], ss
54
55 ; Load new stack and restore DS and DI
56 mov di, ds ; We can save 2 bytes by using PUSH/POP but it's slower
57 mov ss, di ; No need to wrap with CLI/STI since this is for AT only (286+)
58 mov sp, RAMVARS.rgbTopOfStack-4
59 pop di ; DI before stack change
60 pop ds ; DS before stack change
61
62 ; Call INT 13h
63 pushf
64 push cs
65 call Int13h_DiskFunctionsHandler
66
67 ; Restore stack (we must not corrupt FLAGS!)
68%ifdef USE_386
69 lss sp, [ss:RAMVARS.fpInt13hEntryStack]
70%else
71 cli
72 mov sp, [ss:RAMVARS.fpInt13hEntryStack]
73 mov ss, [ss:RAMVARS.fpInt13hEntryStack+2]
74 sti
75%endif
76 retf 2 ; Skip FLAGS from stack
77%endif ; RELOCATE_INT13H_STACK
78
79
80;--------------------------------------------------------------------
81; Int 13h software interrupt handler.
82; Jumps to specific function defined in AH.
83;
84; Note to developers: Do not make recursive INT 13h calls!
85;
86; Int13h_DiskFunctionsHandler
87; Parameters:
88; AH: Bios function
89; DL: Drive number
90; Other: Depends on function
91; Returns:
92; Depends on function
93;--------------------------------------------------------------------
94ALIGN JUMP_ALIGN
95Int13h_DiskFunctionsHandler:
96%ifndef RELOCATE_INT13H_STACK
97 sti ; Enable interrupts
98%endif
99 cld ; String instructions to increment pointers
100 CREATE_FRAME_INTPACK_TO_SSBP SIZE_OF_IDEPACK_WITHOUT_INTPACK
101 call RamVars_GetSegmentToDS
102
103%ifdef MODULE_DRIVEXLATE
104 call DriveXlate_ToOrBack
105%endif
106 call FindDPT_ForDriveNumberInDL ; DS:DI points to our DPT, or NULL if not our drive
107 jc SHORT .NotOurDrive ; DPT not found so this is not one of our drives
108
109.OurFunction:
110 ; Jump to correct BIOS function
111 eMOVZX bx, ah
112 eSHL_IM bx, 1
113 cmp ah, 25h ; Possible EBIOS function?
114%ifndef MODULE_EBIOS
115 ja SHORT UnsupportedFunction
116 jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
117
118%else ; If using MODULE_EBIOS
119 ja SHORT .JumpToEbiosFunction
120 jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
121
122ALIGN JUMP_ALIGN
123.JumpToEbiosFunction:
124 test BYTE [di+DPT.bFlagsLow], FLGL_DPT_LBA
125 jz SHORT UnsupportedFunction ; No eINT 13h for CHS drives
126 sub bl, 41h<<1 ; BX = Offset to eINT 13h jump table
127 jb SHORT UnsupportedFunction
128 cmp ah, 48h
129 ja SHORT UnsupportedFunction
130 jmp [cs:bx+g_rgwEbiosFunctionJumpTable]
131%endif ; MODULE_EBIOS
132
133
134ALIGN JUMP_ALIGN
135.NotOurDrive:
136 test ah, ah
137 jz SHORT .OurFunction ; We handle all function 0h requests (resets)
138
139%ifndef MODULE_SERIAL_FLOPPY
140; Without floppy support, we handle only hard disk traffic for function 08h.
141 test dl, dl
142 jns SHORT Int13h_DirectCallToAnotherBios
143%endif
144; With floppy support, we handle all traffic for function 08h, as we need to wrap both hard disk and floppy drive counts.
145 cmp ah, GET_DRIVE_PARAMETERS
146 je SHORT .OurFunction
147 ; Fall to Int13h_DirectCallToAnotherBios
148
149
150;--------------------------------------------------------------------
151; UnsupportedFunction
152; Int13h_DirectCallToAnotherBios
153; Parameters:
154; DL: Translated drive number
155; DS: RAMVARS segment
156; SS:BP: Ptr to IDEPACK
157; BX, DI: Corrupted on Int13h_DiskFunctionsHandler
158; Other: Function specific INT 13h parameters
159; Returns:
160; Depends on function
161; Corrupts registers:
162; Flags
163;--------------------------------------------------------------------
164ALIGN JUMP_ALIGN
165UnsupportedFunction:
166Int13h_DirectCallToAnotherBios:
167%ifdef MODULE_DRIVEXLATE
168 ; Disable drive number translations in case of recursive INT 13h calls
169 mov [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv], dl
170 push WORD [RAMVARS.xlateVars+XLATEVARS.wFDandHDswap]
171 call DriveXlate_Reset ; No translation
172%endif
173
174 push bp ; Store offset to IDEPACK (SS:SP now points it)
175
176 ; Simulate INT by pushing flags and return address
177 push WORD [bp+IDEPACK.intpack+INTPACK.flags]
178 popf
179 pushf ; Simulate INT by pushing flags
180 push cs
181 ePUSH_T di, .ReturnFromAnotherBios ; Can not corrupt flags
182
183 ; Push old INT 13h handler and restore registers
184 push WORD [RAMVARS.fpOldI13h+2]
185 push WORD [RAMVARS.fpOldI13h]
186 mov bx, [bp+IDEPACK.intpack+INTPACK.bx]
187 mov di, [bp+IDEPACK.intpack+INTPACK.di]
188 mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
189 mov bp, [bp+IDEPACK.intpack+INTPACK.bp]
190 retf ; "Return" to old INT 13h
191.ReturnFromAnotherBios:
192
193%if 0
194 ; We need to restore our pointer to IDEPACK but we cannot corrupt any register
195 push ax ; Dummy WORD
196 cli
197 xchg bp, sp
198 mov [bp], sp ; Replace dummy WORD with returned BP
199 mov sp, [bp+2] ; Load offset to IDEPACK
200 xchg sp, bp
201 sti ; We would have set IF anyway when exiting INT 13h
202 pop WORD [bp+IDEPACK.intpack+INTPACK.bp]
203%endif
204 ; Actually we can corrupt BP since no standard INT 13h function uses it as return
205 ; register. Above code is kept here just in case if there is some non-standard function.
206 ; POP BP below also belongs to the above code.
207 pop bp ; Clean IDEPACK offset from stack
208
209 ; Store remaining returned values to INTPACK
210%ifdef USE_386
211; We do not use GS or FS at the moment
212; mov [bp+IDEPACK.intpack+INTPACK.gs], gs
213; mov [bp+IDEPACK.intpack+INTPACK.fs], fs
214%endif
215 mov [bp+IDEPACK.intpack+INTPACK.es], es
216 mov [bp+IDEPACK.intpack+INTPACK.ds], ds
217 mov [bp+IDEPACK.intpack+INTPACK.di], di
218 mov [bp+IDEPACK.intpack+INTPACK.si], si
219 mov [bp+IDEPACK.intpack+INTPACK.bx], bx
220%ifdef MODULE_DRIVEXLATE
221 mov [bp+IDEPACK.intpack+INTPACK.dh], dh
222%else
223 mov [bp+IDEPACK.intpack+INTPACK.dx], dx
224%endif
225 mov [bp+IDEPACK.intpack+INTPACK.cx], cx
226 mov [bp+IDEPACK.intpack+INTPACK.ax], ax
227 pushf
228 pop WORD [bp+IDEPACK.intpack+INTPACK.flags]
229 call RamVars_GetSegmentToDS
230
231%ifdef MODULE_DRIVEXLATE
232 ; Restore drive number translation back to what it was
233 pop WORD [RAMVARS.xlateVars+XLATEVARS.wFDandHDswap]
234 cmp dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv] ; DL is still drive number?
235 je SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
236 mov [bp+IDEPACK.intpack+INTPACK.dl], dl ; Something is returned in DL
237%endif
238 jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
239
240
241%ifdef MODULE_SERIAL_FLOPPY
242;--------------------------------------------------------------------
243; Int13h_ReturnSuccessForFloppy
244;
245; Some operations, such as format of a floppy disk track, should just
246; return success, while for hard disks it should be treated as unsupported.
247;--------------------------------------------------------------------
248ALIGN JUMP_ALIGN
249Int13h_ReturnSuccessForFloppy:
250 test dl, dl
251 js SHORT UnsupportedFunction
252 xor ah, ah
253 jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
254%endif
255
256
257;--------------------------------------------------------------------
258; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL
259; Parameters:
260; AH: BIOS Error code
261; CL: Number of sectors actually transferred
262; SS:BP: Ptr to IDEPACK
263; Returns:
264; All registers are loaded from INTPACK
265;--------------------------------------------------------------------
266ALIGN JUMP_ALIGN
267Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL:
268 mov [bp+IDEPACK.intpack+INTPACK.al], cl
269 ; Fall to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
270
271
272;--------------------------------------------------------------------
273; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
274; Int13h_ReturnFromHandlerWithoutStoringErrorCode
275; Parameters:
276; AH: BIOS Error code
277; SS:BP: Ptr to IDEPACK
278; Returns:
279; All registers are loaded from INTPACK
280;--------------------------------------------------------------------
281ALIGN JUMP_ALIGN
282Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH:
283%ifdef MODULE_SERIAL_FLOPPY
284 mov al, [bp+IDEPACK.intpack+INTPACK.dl]
285Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH_ALHasDriveNumber:
286 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber
287
288%else
289 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
290%endif
291
292Int13h_ReturnFromHandlerWithoutStoringErrorCode:
293 ; Always return with interrupts enabled since there are programs that rely
294 ; on INT 13h to enable interrupts.
295 or BYTE [bp+IDEPACK.intpack+INTPACK.flags+1], (FLG_FLAGS_IF>>8)
296 mov sp, bp ; This makes possible to exit anytime, no matter what is on stack
297 RESTORE_FRAME_INTPACK_FROM_SSBP SIZE_OF_IDEPACK_WITHOUT_INTPACK
298
299
300;--------------------------------------------------------------------
301; Int13h_CallPreviousInt13hHandler
302; Parameters:
303; AH: INT 13h function to call
304; DL: Drive number
305; DS: RAMVARS segment
306; Returns:
307; Depends on function
308; NOTE: ES:DI needs to be returned from the previous interrupt
309; handler, for floppy DPT in function 08h
310; Corrupts registers:
311; None
312;--------------------------------------------------------------------
313ALIGN JUMP_ALIGN
314Int13h_CallPreviousInt13hHandler:
315 pushf ; Simulate INT by pushing flags
316 call far [RAMVARS.fpOldI13h]
317 ret
318
319
320;--------------------------------------------------------------------
321; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
322; Int13h_SetErrorCodeToIntpackInSSBPfromAH
323; Parameters:
324; AH: BIOS error code (00h = no error)
325; SS:BP: Ptr to IDEPACK
326; Returns:
327; SS:BP: Ptr to IDEPACK with error condition set
328; Corrupts registers:
329; DS, DI
330;--------------------------------------------------------------------
331ALIGN JUMP_ALIGN
332%ifdef MODULE_SERIAL_FLOPPY
333Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber:
334 ; Store error code to BDA
335 mov bx, BDA.bHDLastSt
336 test al, al
337 js SHORT .HardDisk
338 mov bl, BDA.bFDRetST & 0xff
339.HardDisk:
340 LOAD_BDA_SEGMENT_TO ds, di
341 mov [bx], ah
342 ; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH
343
344%else
345Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH:
346 ; Store error code to BDA
347 LOAD_BDA_SEGMENT_TO ds, di
348 mov [BDA.bHDLastSt], ah
349 ; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH
350%endif
351
352 ; Store error code to INTPACK
353Int13h_SetErrorCodeToIntpackInSSBPfromAH:
354 mov [bp+IDEPACK.intpack+INTPACK.ah], ah
355 test ah, ah
356 jnz SHORT .SetCFtoIntpack
357 and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF
358 ret
359.SetCFtoIntpack:
360 or BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF
361 ret
362
363
364; Jump table for correct BIOS function
365ALIGN WORD_ALIGN
366g_rgw13hFuncJump:
367 dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All)
368 dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All)
369 dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All)
370 dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All)
371 dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All)
372%ifdef MODULE_SERIAL_FLOPPY
373 dw Int13h_ReturnSuccessForFloppy ; 05h, Format Disk Track (XT, AT, EISA)
374%else
375 dw UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA)
376%endif
377 dw UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT)
378 dw UnsupportedFunction ; 07h, Format Multiple Cylinders (XT)
379 dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All)
380 dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All)
381 dw UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA)
382 dw UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA)
383 dw AHCh_HandlerForSeek ; 0Ch, Seek (All)
384 dw AH9h_HandlerForInitializeDriveParameters ; 0Dh, Alternate Disk Reset (All)
385 dw UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
386 dw UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
387 dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All)
388 dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All)
389 dw UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT)
390 dw UnsupportedFunction ; 13h, Drive Diagnostic (XT)
391 dw AH10h_HandlerForCheckDriveReady ; 14h, Controller Internal Diagnostic (All)
392 dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+)
393 dw UnsupportedFunction ; 16h,
394 dw UnsupportedFunction ; 17h,
395 dw UnsupportedFunction ; 18h,
396 dw UnsupportedFunction ; 19h, Park Heads (PS/2)
397 dw UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2)
398 dw UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2)
399 dw UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2)
400 dw UnsupportedFunction ; 1Dh,
401%ifdef MODULE_8BIT_IDE_ADVANCED
402 dw AH1Eh_HandlerForXTCFfeatures ; 1Eh, Lo-tech XT-CF features (XTIDE Universal BIOS)
403%else
404 dw UnsupportedFunction ; 1Eh,
405%endif
406 dw UnsupportedFunction ; 1Fh,
407 dw UnsupportedFunction ; 20h,
408 dw UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1)
409 dw UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1)
410 dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1)
411 dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1)
412 dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1)
413
414%ifdef MODULE_EBIOS
415g_rgwEbiosFunctionJumpTable:
416 dw AH41h_HandlerForCheckIfExtensionsPresent ; 41h, Check if Extensions Present (EBIOS)*
417 dw AH42h_HandlerForExtendedReadSectors ; 42h, Extended Read Sectors (EBIOS)*
418 dw AH43h_HandlerForExtendedWriteSectors ; 43h, Extended Write Sectors (EBIOS)*
419 dw AH44h_HandlerForExtendedVerifySectors ; 44h, Extended Verify Sectors (EBIOS)*
420 dw UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS)***
421 dw UnsupportedFunction ; 46h, Eject Media Request (EBIOS)***
422 dw AH47h_HandlerForExtendedSeek ; 47h, Extended Seek (EBIOS)*
423 dw AH48h_HandlerForGetExtendedDriveParameters ; 48h, Get Extended Drive Parameters (EBIOS)*
424; dw UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS)***
425; dw UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM)
426; dw UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM)
427; dw UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM)
428; dw UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM)
429; dw UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS)**
430;
431; * = Enhanced Drive Access Support (minimum required EBIOS functions)
432; ** = Enhanced Disk Drive (EDD) Support
433; *** = Drive Locking and Ejecting Support
434%endif
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