source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm@ 625

Last change on this file since 625 was 618, checked in by Krister Nordvall, 3 years ago

Changes:

  • Updated the BIOS makefile. Added the NO_ATAID_CORRECTION define back to the Tiny build as I've realized that the correction code should not be needed for builds without MODULE_EBIOS. Also added a new makefile target 'custom' to make it easier for people to make custom builds.
  • Fixed a bug where calling INT 13h/AH=15h for drives not handled by XUB (floppy drives for example) would return an error due to the fact that any non-zero return value in AH from the other BIOS would cause the CF to be set in Int13h_SetErrorCodeToIntpackInSSBPfromAH. The return path is now via Int13h_ReturnFromHandlerWithoutStoringErrorCode which means that no status/error code will be returned in the BDA but that should not be a problem as the other BIOS should do that anyway. This change also fixed another potential problem where return values in DL from the other BIOS were assumed to be drive numbers when MODULE_SERIAL_FLOPPY is included in the build.
  • Minor optimizations and fixes.
File size: 16.7 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%ifdef CLD_NEEDED
100 cld ; String instructions to increment pointers
101%endif
102 ePUSHA
103 push ds
104 push es
105%ifdef USE_386
106; push fs
107; push gs
108%endif
109 sub sp, BYTE SIZE_OF_IDEPACK_WITHOUT_INTPACK
110 mov bp, sp
111 call RamVars_GetSegmentToDS
112
113%ifdef MODULE_DRIVEXLATE
114 call DriveXlate_ToOrBack
115%endif
116 call FindDPT_ForDriveNumberInDL ; DS:DI points to our DPT, or NULL if not our drive
117 jc SHORT .NotOurDrive ; DPT not found so this is not one of our drives
118
119.OurFunction:
120 ; Jump to correct BIOS function
121 eMOVZX bx, ah
122 eSHL_IM bx, 1
123 cmp ah, 25h ; Possible EBIOS function?
124%ifndef MODULE_EBIOS
125 ja SHORT UnsupportedFunction
126 jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
127
128%else ; If using MODULE_EBIOS
129 ja SHORT .JumpToEbiosFunction
130 jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
131
132ALIGN JUMP_ALIGN
133.JumpToEbiosFunction:
134 test BYTE [di+DPT.bFlagsLow], FLGL_DPT_LBA
135 jz SHORT UnsupportedFunction ; No eINT 13h for CHS drives
136 sub bl, 41h<<1 ; BX = Offset to eINT 13h jump table
137 jb SHORT UnsupportedFunction
138 cmp ah, 48h
139 ja SHORT UnsupportedFunction
140 jmp [cs:bx+g_rgwEbiosFunctionJumpTable]
141%endif ; MODULE_EBIOS
142
143
144ALIGN JUMP_ALIGN
145.NotOurDrive:
146 test ah, ah
147 jz SHORT .OurFunction ; We handle all function 0h requests (resets)
148
149%ifndef MODULE_SERIAL_FLOPPY
150; Without floppy support, we handle only hard disk traffic for function 08h.
151 test dl, dl
152 jns SHORT Int13h_DirectCallToAnotherBios
153%endif
154; With floppy support, we handle all traffic for function 08h, as we need to wrap both hard disk and floppy drive counts.
155 cmp ah, GET_DRIVE_PARAMETERS
156 je SHORT .OurFunction
157 ; Fall to Int13h_DirectCallToAnotherBios
158
159
160;--------------------------------------------------------------------
161; UnsupportedFunction
162; Int13h_DirectCallToAnotherBios
163; Parameters:
164; DL: Translated drive number
165; DS: RAMVARS segment
166; SS:BP: Ptr to IDEPACK
167; BX, DI: Corrupted on Int13h_DiskFunctionsHandler
168; Other: Function specific INT 13h parameters
169; Returns:
170; Depends on function
171; Corrupts registers:
172; Flags
173;--------------------------------------------------------------------
174ALIGN JUMP_ALIGN
175UnsupportedFunction:
176Int13h_DirectCallToAnotherBios:
177%ifdef MODULE_DRIVEXLATE
178 ; Disable drive number translations in case of recursive INT 13h calls
179 mov [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv], dl
180 push WORD [RAMVARS.xlateVars+XLATEVARS.wFDandHDswap]
181 call DriveXlate_Reset ; No translation
182%endif
183
184 push bp ; Store offset to IDEPACK (SS:SP now points it)
185
186 ; Simulate INT by pushing flags and return address
187 push WORD [bp+IDEPACK.intpack+INTPACK.flags]
188%if 0
189 ; No standard INT 13h function uses FLAGS as parameters so no need to restore them
190 popf
191 pushf
192%endif
193 push cs
194 ePUSH_T di, .ReturnFromAnotherBios ; Can not corrupt flags
195
196 ; Push old INT 13h handler and restore registers
197%ifdef USE_386
198 push DWORD [RAMVARS.fpOldI13h]
199%else
200 push WORD [RAMVARS.fpOldI13h+2]
201 push WORD [RAMVARS.fpOldI13h]
202%endif
203 mov bx, [bp+IDEPACK.intpack+INTPACK.bx]
204 mov di, [bp+IDEPACK.intpack+INTPACK.di]
205 mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
206 mov bp, [bp+IDEPACK.intpack+INTPACK.bp]
207 retf ; "Return" to old INT 13h
208.ReturnFromAnotherBios:
209
210%if 0
211 ; We need to restore our pointer to IDEPACK but we cannot corrupt any register
212 push ax ; Dummy WORD
213 cli
214 xchg bp, sp
215 mov [bp], sp ; Replace dummy WORD with returned BP
216 mov sp, [bp+2] ; Load offset to IDEPACK
217 xchg sp, bp
218 sti ; We would have set IF anyway when exiting INT 13h
219 pop WORD [bp+IDEPACK.intpack+INTPACK.bp]
220%endif
221 ; Actually we can corrupt BP since no standard INT 13h function uses it as return
222 ; register. Above code is kept here just in case if there is some non-standard function.
223 ; POP BP below also belongs to the above code.
224 pop bp ; Clean IDEPACK offset from stack
225
226 ; Store remaining returned values to INTPACK
227%ifdef USE_386
228; We do not use GS or FS at the moment
229; mov [bp+IDEPACK.intpack+INTPACK.gs], gs
230; mov [bp+IDEPACK.intpack+INTPACK.fs], fs
231%endif
232 mov [bp+IDEPACK.intpack+INTPACK.es], es
233 mov [bp+IDEPACK.intpack+INTPACK.ds], ds
234 mov [bp+IDEPACK.intpack+INTPACK.di], di
235 mov [bp+IDEPACK.intpack+INTPACK.si], si
236 mov [bp+IDEPACK.intpack+INTPACK.bx], bx
237%ifdef MODULE_DRIVEXLATE
238 mov [bp+IDEPACK.intpack+INTPACK.dh], dh
239%else
240 mov [bp+IDEPACK.intpack+INTPACK.dx], dx
241%endif
242 mov [bp+IDEPACK.intpack+INTPACK.cx], cx
243 mov [bp+IDEPACK.intpack+INTPACK.ax], ax
244 pushf
245 pop WORD [bp+IDEPACK.intpack+INTPACK.flags]
246 call RamVars_GetSegmentToDS
247
248%ifdef MODULE_DRIVEXLATE
249 ; Restore drive number translation back to what it was
250 pop WORD [RAMVARS.xlateVars+XLATEVARS.wFDandHDswap]
251 cmp dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv] ; DL is still drive number?
252 je SHORT Int13h_ReturnFromHandlerWithoutStoringErrorCode
253 mov [bp+IDEPACK.intpack+INTPACK.dl], dl ; Something is returned in DL
254%endif
255 jmp SHORT Int13h_ReturnFromHandlerWithoutStoringErrorCode
256 ; We cannot return via Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH!
257 ; 1. If the other BIOS returns something in DL then that is assumed to be a drive number
258 ; (if MODULE_SERIAL_FLOPPY is included) even though it could be anything.
259 ; 2. Any non-zero value in AH will cause the CF to be set on return from the handler.
260 ; This breaks INT 13h/AH=15h for drives handled by the other BIOS.
261
262
263%ifdef MODULE_SERIAL_FLOPPY
264;--------------------------------------------------------------------
265; Int13h_ReturnSuccessForFloppy
266;
267; Some operations, such as format of a floppy disk track, should just
268; return success, while for hard disks it should be treated as unsupported.
269;--------------------------------------------------------------------
270ALIGN JUMP_ALIGN
271Int13h_ReturnSuccessForFloppy:
272 test dl, dl
273 js SHORT UnsupportedFunction
274 xor ah, ah
275 jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
276%endif
277
278
279;--------------------------------------------------------------------
280; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL
281; Parameters:
282; AH: BIOS Error code
283; CL: Number of sectors actually transferred
284; SS:BP: Ptr to IDEPACK
285; Returns:
286; All registers are loaded from INTPACK
287;--------------------------------------------------------------------
288ALIGN JUMP_ALIGN
289Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL:
290 mov [bp+IDEPACK.intpack+INTPACK.al], cl
291 ; Fall to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
292
293
294;--------------------------------------------------------------------
295; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
296; Int13h_ReturnFromHandlerWithoutStoringErrorCode
297; Parameters:
298; AH: BIOS Error code
299; SS:BP: Ptr to IDEPACK
300; Returns:
301; All registers are loaded from INTPACK
302;--------------------------------------------------------------------
303ALIGN JUMP_ALIGN
304Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH:
305%ifdef MODULE_SERIAL_FLOPPY
306 mov al, [bp+IDEPACK.intpack+INTPACK.dl]
307Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH_ALHasDriveNumber:
308 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber
309
310%else
311 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
312%endif
313
314Int13h_ReturnFromHandlerWithoutStoringErrorCode:
315 ; Always return with interrupts enabled since there are programs that rely
316 ; on INT 13h to enable interrupts.
317 or BYTE [bp+IDEPACK.intpack+INTPACK.flags+1], (FLG_FLAGS_IF>>8)
318
319 lea sp, [bp+SIZE_OF_IDEPACK_WITHOUT_INTPACK]
320%ifdef USE_386
321; pop gs
322; pop fs
323%endif
324 pop es
325 pop ds
326 ePOPA
327 iret
328
329
330;--------------------------------------------------------------------
331; Int13h_CallPreviousInt13hHandler
332; Parameters:
333; AH: INT 13h function to call
334; DL: Drive number
335; DS: RAMVARS segment
336; Returns:
337; Depends on function
338; NOTE: ES:DI needs to be returned from the previous interrupt
339; handler, for floppy DPT in function 08h
340; Corrupts registers:
341; None
342;--------------------------------------------------------------------
343ALIGN JUMP_ALIGN
344Int13h_CallPreviousInt13hHandler:
345 pushf ; Simulate INT by pushing flags
346 call FAR [RAMVARS.fpOldI13h]
347 ret
348
349
350;--------------------------------------------------------------------
351; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber
352; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
353; Int13h_SetErrorCodeToIntpackInSSBPfromAH
354; Parameters:
355; AH: BIOS error code (00h = no error)
356; SS:BP: Ptr to IDEPACK
357; Returns:
358; SS:BP: Ptr to IDEPACK with error condition set
359; Corrupts registers:
360; DS, BX, DI
361;--------------------------------------------------------------------
362ALIGN JUMP_ALIGN
363%ifdef MODULE_SERIAL_FLOPPY
364Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber:
365 ; Store error code to BDA
366 mov bx, BDA.bHDLastSt
367 test al, al
368 js SHORT .HardDisk
369 mov bl, BDA.bFDRetST & 0xff
370.HardDisk:
371 LOAD_BDA_SEGMENT_TO ds, di
372 mov [bx], ah
373 ; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH
374
375%else
376Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH:
377 ; Store error code to BDA
378 LOAD_BDA_SEGMENT_TO ds, di
379 mov [BDA.bHDLastSt], ah
380 ; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH
381%endif
382
383 ; Store error code to INTPACK
384Int13h_SetErrorCodeToIntpackInSSBPfromAH:
385 mov [bp+IDEPACK.intpack+INTPACK.ah], ah
386 test ah, ah
387 jnz SHORT .SetCFtoIntpack
388 and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF
389 ret
390.SetCFtoIntpack:
391 or BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF
392 ret
393
394
395; Jump table for correct BIOS function
396ALIGN WORD_ALIGN
397g_rgw13hFuncJump:
398 dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All)
399 dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All)
400 dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All)
401 dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All)
402 dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All)
403%ifdef MODULE_SERIAL_FLOPPY
404 dw Int13h_ReturnSuccessForFloppy ; 05h, Format Disk Track (XT, AT, EISA)
405%else
406 dw UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA)
407%endif
408 dw UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT)
409 dw UnsupportedFunction ; 07h, Format Multiple Cylinders (XT)
410 dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All)
411 dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All)
412 dw UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA)
413 dw UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA)
414 dw AHCh_HandlerForSeek ; 0Ch, Seek (All)
415 dw AH9h_HandlerForInitializeDriveParameters ; 0Dh, Alternate Disk Reset (All)
416 dw UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
417 dw UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
418 dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All)
419 dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All)
420 dw UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT)
421 dw UnsupportedFunction ; 13h, Drive Diagnostic (XT)
422 dw AH10h_HandlerForCheckDriveReady ; 14h, Controller Internal Diagnostic (All)
423 dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+)
424 dw UnsupportedFunction ; 16h,
425 dw UnsupportedFunction ; 17h,
426 dw UnsupportedFunction ; 18h,
427 dw UnsupportedFunction ; 19h, Park Heads (PS/2)
428 dw UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2)
429 dw UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2)
430 dw UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2)
431 dw UnsupportedFunction ; 1Dh,
432%ifdef MODULE_8BIT_IDE_ADVANCED
433 dw AH1Eh_HandlerForXTCFfeatures ; 1Eh, Lo-tech XT-CF features (XTIDE Universal BIOS)
434%else
435 dw UnsupportedFunction ; 1Eh,
436%endif
437 dw UnsupportedFunction ; 1Fh,
438 dw UnsupportedFunction ; 20h,
439 dw UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1)
440 dw UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1)
441 dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1)
442 dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1)
443 dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1)
444
445%ifdef MODULE_EBIOS
446g_rgwEbiosFunctionJumpTable:
447 dw AH41h_HandlerForCheckIfExtensionsPresent ; 41h, Check if Extensions Present (EBIOS)*
448 dw AH42h_HandlerForExtendedReadSectors ; 42h, Extended Read Sectors (EBIOS)*
449 dw AH43h_HandlerForExtendedWriteSectors ; 43h, Extended Write Sectors (EBIOS)*
450 dw AH44h_HandlerForExtendedVerifySectors ; 44h, Extended Verify Sectors (EBIOS)*
451 dw UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS)***
452 dw UnsupportedFunction ; 46h, Eject Media Request (EBIOS)***
453 dw AH47h_HandlerForExtendedSeek ; 47h, Extended Seek (EBIOS)*
454 dw AH48h_HandlerForGetExtendedDriveParameters ; 48h, Get Extended Drive Parameters (EBIOS)*
455; dw UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS)***
456; dw UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM)
457; dw UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM)
458; dw UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM)
459; dw UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM)
460; dw UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS)**
461;
462; * = Enhanced Drive Access Support (minimum required EBIOS functions)
463; ** = Enhanced Disk Drive (EDD) Support
464; *** = Drive Locking and Ejecting Support
465%endif
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