source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm@ 561

Last change on this file since 561 was 561, checked in by aitotat@…, 11 years ago

Changes to XTIDE Universal BIOS:

  • MODULE_VERY_LATE_INITIALIZATION is not included on AT builds by default.
  • Very late initialization now uses 32h instead of 20h for temporary vector (untested but 20h might cause problems with ROM DOS).
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%if 0
179 ; No standard INT 13h function uses FLAGS as parameters so no need to restore them
180 popf
181 pushf
182%endif
183 push cs
184 ePUSH_T di, .ReturnFromAnotherBios ; Can not corrupt flags
185
186 ; Push old INT 13h handler and restore registers
187 push WORD [RAMVARS.fpOldI13h+2]
188 push WORD [RAMVARS.fpOldI13h]
189 mov bx, [bp+IDEPACK.intpack+INTPACK.bx]
190 mov di, [bp+IDEPACK.intpack+INTPACK.di]
191 mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
192 mov bp, [bp+IDEPACK.intpack+INTPACK.bp]
193 retf ; "Return" to old INT 13h
194.ReturnFromAnotherBios:
195
196%if 0
197 ; We need to restore our pointer to IDEPACK but we cannot corrupt any register
198 push ax ; Dummy WORD
199 cli
200 xchg bp, sp
201 mov [bp], sp ; Replace dummy WORD with returned BP
202 mov sp, [bp+2] ; Load offset to IDEPACK
203 xchg sp, bp
204 sti ; We would have set IF anyway when exiting INT 13h
205 pop WORD [bp+IDEPACK.intpack+INTPACK.bp]
206%endif
207 ; Actually we can corrupt BP since no standard INT 13h function uses it as return
208 ; register. Above code is kept here just in case if there is some non-standard function.
209 ; POP BP below also belongs to the above code.
210 pop bp ; Clean IDEPACK offset from stack
211
212 ; Store remaining returned values to INTPACK
213%ifdef USE_386
214; We do not use GS or FS at the moment
215; mov [bp+IDEPACK.intpack+INTPACK.gs], gs
216; mov [bp+IDEPACK.intpack+INTPACK.fs], fs
217%endif
218 mov [bp+IDEPACK.intpack+INTPACK.es], es
219 mov [bp+IDEPACK.intpack+INTPACK.ds], ds
220 mov [bp+IDEPACK.intpack+INTPACK.di], di
221 mov [bp+IDEPACK.intpack+INTPACK.si], si
222 mov [bp+IDEPACK.intpack+INTPACK.bx], bx
223%ifdef MODULE_DRIVEXLATE
224 mov [bp+IDEPACK.intpack+INTPACK.dh], dh
225%else
226 mov [bp+IDEPACK.intpack+INTPACK.dx], dx
227%endif
228 mov [bp+IDEPACK.intpack+INTPACK.cx], cx
229 mov [bp+IDEPACK.intpack+INTPACK.ax], ax
230 pushf
231 pop WORD [bp+IDEPACK.intpack+INTPACK.flags]
232 call RamVars_GetSegmentToDS
233
234%ifdef MODULE_DRIVEXLATE
235 ; Restore drive number translation back to what it was
236 pop WORD [RAMVARS.xlateVars+XLATEVARS.wFDandHDswap]
237 cmp dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv] ; DL is still drive number?
238 je SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
239 mov [bp+IDEPACK.intpack+INTPACK.dl], dl ; Something is returned in DL
240%endif
241 jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
242
243
244%ifdef MODULE_SERIAL_FLOPPY
245;--------------------------------------------------------------------
246; Int13h_ReturnSuccessForFloppy
247;
248; Some operations, such as format of a floppy disk track, should just
249; return success, while for hard disks it should be treated as unsupported.
250;--------------------------------------------------------------------
251ALIGN JUMP_ALIGN
252Int13h_ReturnSuccessForFloppy:
253 test dl, dl
254 js SHORT UnsupportedFunction
255 xor ah, ah
256 jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
257%endif
258
259
260;--------------------------------------------------------------------
261; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL
262; Parameters:
263; AH: BIOS Error code
264; CL: Number of sectors actually transferred
265; SS:BP: Ptr to IDEPACK
266; Returns:
267; All registers are loaded from INTPACK
268;--------------------------------------------------------------------
269ALIGN JUMP_ALIGN
270Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL:
271 mov [bp+IDEPACK.intpack+INTPACK.al], cl
272 ; Fall to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
273
274
275;--------------------------------------------------------------------
276; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
277; Int13h_ReturnFromHandlerWithoutStoringErrorCode
278; Parameters:
279; AH: BIOS Error code
280; SS:BP: Ptr to IDEPACK
281; Returns:
282; All registers are loaded from INTPACK
283;--------------------------------------------------------------------
284ALIGN JUMP_ALIGN
285Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH:
286%ifdef MODULE_SERIAL_FLOPPY
287 mov al, [bp+IDEPACK.intpack+INTPACK.dl]
288Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH_ALHasDriveNumber:
289 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber
290
291%else
292 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
293%endif
294
295Int13h_ReturnFromHandlerWithoutStoringErrorCode:
296 ; Always return with interrupts enabled since there are programs that rely
297 ; on INT 13h to enable interrupts.
298 or BYTE [bp+IDEPACK.intpack+INTPACK.flags+1], (FLG_FLAGS_IF>>8)
299 mov sp, bp ; This makes possible to exit anytime, no matter what is on stack
300 RESTORE_FRAME_INTPACK_FROM_SSBP SIZE_OF_IDEPACK_WITHOUT_INTPACK
301
302
303;--------------------------------------------------------------------
304; Int13h_CallPreviousInt13hHandler
305; Parameters:
306; AH: INT 13h function to call
307; DL: Drive number
308; DS: RAMVARS segment
309; Returns:
310; Depends on function
311; NOTE: ES:DI needs to be returned from the previous interrupt
312; handler, for floppy DPT in function 08h
313; Corrupts registers:
314; None
315;--------------------------------------------------------------------
316ALIGN JUMP_ALIGN
317Int13h_CallPreviousInt13hHandler:
318 pushf ; Simulate INT by pushing flags
319 call far [RAMVARS.fpOldI13h]
320 ret
321
322
323;--------------------------------------------------------------------
324; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
325; Int13h_SetErrorCodeToIntpackInSSBPfromAH
326; Parameters:
327; AH: BIOS error code (00h = no error)
328; SS:BP: Ptr to IDEPACK
329; Returns:
330; SS:BP: Ptr to IDEPACK with error condition set
331; Corrupts registers:
332; DS, DI
333;--------------------------------------------------------------------
334ALIGN JUMP_ALIGN
335%ifdef MODULE_SERIAL_FLOPPY
336Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber:
337 ; Store error code to BDA
338 mov bx, BDA.bHDLastSt
339 test al, al
340 js SHORT .HardDisk
341 mov bl, BDA.bFDRetST & 0xff
342.HardDisk:
343 LOAD_BDA_SEGMENT_TO ds, di
344 mov [bx], ah
345 ; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH
346
347%else
348Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH:
349 ; Store error code to BDA
350 LOAD_BDA_SEGMENT_TO ds, di
351 mov [BDA.bHDLastSt], ah
352 ; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH
353%endif
354
355 ; Store error code to INTPACK
356Int13h_SetErrorCodeToIntpackInSSBPfromAH:
357 mov [bp+IDEPACK.intpack+INTPACK.ah], ah
358 test ah, ah
359 jnz SHORT .SetCFtoIntpack
360 and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF
361 ret
362.SetCFtoIntpack:
363 or BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF
364 ret
365
366
367; Jump table for correct BIOS function
368ALIGN WORD_ALIGN
369g_rgw13hFuncJump:
370 dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All)
371 dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All)
372 dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All)
373 dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All)
374 dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All)
375%ifdef MODULE_SERIAL_FLOPPY
376 dw Int13h_ReturnSuccessForFloppy ; 05h, Format Disk Track (XT, AT, EISA)
377%else
378 dw UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA)
379%endif
380 dw UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT)
381 dw UnsupportedFunction ; 07h, Format Multiple Cylinders (XT)
382 dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All)
383 dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All)
384 dw UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA)
385 dw UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA)
386 dw AHCh_HandlerForSeek ; 0Ch, Seek (All)
387 dw AH9h_HandlerForInitializeDriveParameters ; 0Dh, Alternate Disk Reset (All)
388 dw UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
389 dw UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
390 dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All)
391 dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All)
392 dw UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT)
393 dw UnsupportedFunction ; 13h, Drive Diagnostic (XT)
394 dw AH10h_HandlerForCheckDriveReady ; 14h, Controller Internal Diagnostic (All)
395 dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+)
396 dw UnsupportedFunction ; 16h,
397 dw UnsupportedFunction ; 17h,
398 dw UnsupportedFunction ; 18h,
399 dw UnsupportedFunction ; 19h, Park Heads (PS/2)
400 dw UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2)
401 dw UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2)
402 dw UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2)
403 dw UnsupportedFunction ; 1Dh,
404%ifdef MODULE_8BIT_IDE_ADVANCED
405 dw AH1Eh_HandlerForXTCFfeatures ; 1Eh, Lo-tech XT-CF features (XTIDE Universal BIOS)
406%else
407 dw UnsupportedFunction ; 1Eh,
408%endif
409 dw UnsupportedFunction ; 1Fh,
410 dw UnsupportedFunction ; 20h,
411 dw UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1)
412 dw UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1)
413 dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1)
414 dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1)
415 dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1)
416
417%ifdef MODULE_EBIOS
418g_rgwEbiosFunctionJumpTable:
419 dw AH41h_HandlerForCheckIfExtensionsPresent ; 41h, Check if Extensions Present (EBIOS)*
420 dw AH42h_HandlerForExtendedReadSectors ; 42h, Extended Read Sectors (EBIOS)*
421 dw AH43h_HandlerForExtendedWriteSectors ; 43h, Extended Write Sectors (EBIOS)*
422 dw AH44h_HandlerForExtendedVerifySectors ; 44h, Extended Verify Sectors (EBIOS)*
423 dw UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS)***
424 dw UnsupportedFunction ; 46h, Eject Media Request (EBIOS)***
425 dw AH47h_HandlerForExtendedSeek ; 47h, Extended Seek (EBIOS)*
426 dw AH48h_HandlerForGetExtendedDriveParameters ; 48h, Get Extended Drive Parameters (EBIOS)*
427; dw UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS)***
428; dw UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM)
429; dw UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM)
430; dw UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM)
431; dw UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM)
432; dw UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS)**
433;
434; * = Enhanced Drive Access Support (minimum required EBIOS functions)
435; ** = Enhanced Disk Drive (EDD) Support
436; *** = Drive Locking and Ejecting Support
437%endif
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