source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm@ 205

Last change on this file since 205 was 181, checked in by krille_n_@…, 13 years ago

Changes to all parts of the project:

  • Size optimizations.
  • Added a define (EXCLUDE_FROM_XTIDECFG) to exclude unused library code from XTIDECFG.
  • Tried to minimize time spent with interrupts disabled.
  • Some minor attempts to improve speed (reordering instructions etc).
  • Tried to improve readability, did some cleanup and fixed some errors in comments.
File size: 10.6 KB
RevLine 
[90]1; Project name : XTIDE Universal BIOS
[3]2; Description : Int 13h BIOS functions (Floppy and Hard disk).
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Int 13h software interrupt handler.
9; Jumps to specific function defined in AH.
10;
[148]11; Note to developers: Do not make recursive INT 13h calls!
12;
13; Int13h_DiskFunctionsHandler
[3]14; Parameters:
15; AH: Bios function
16; DL: Drive number
[148]17; Other: Depends on function
[3]18; Returns:
19; Depends on function
20;--------------------------------------------------------------------
21ALIGN JUMP_ALIGN
[148]22Int13h_DiskFunctionsHandler:
[3]23 sti ; Enable interrupts
[150]24 cld ; String instructions to increment pointers
[155]25 CREATE_FRAME_INTPACK_TO_SSBP EXTRA_BYTES_FOR_INTPACK
[3]26
27 call RamVars_GetSegmentToDS
[148]28 call DriveXlate_ToOrBack
29 mov [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv], dl
[3]30 call RamVars_IsFunctionHandledByThisBIOS
31 jnc SHORT Int13h_DirectCallToAnotherBios
[148]32 call FindDPT_ForDriveNumber ; DS:DI now points to DPT
[3]33
34 ; Jump to correct BIOS function
[148]35 eMOVZX bx, ah
36 shl bx, 1
[165]37 cmp ah, 25h ; Possible EBIOS function?
[176]38%ifdef MODULE_EBIOS
[165]39 ja SHORT .JumpToEbiosFunction
[176]40%else
41 ja SHORT Int13h_UnsupportedFunction
42%endif
[148]43 jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
[3]44
[176]45%ifdef MODULE_EBIOS
[165]46 ; Jump to correct EBIOS function
47ALIGN JUMP_ALIGN
48.JumpToEbiosFunction:
[167]49 test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
50 jz SHORT Int13h_UnsupportedFunction ; No eINT 13h in lite mode
51 test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA
52 jz SHORT Int13h_UnsupportedFunction ; No eINT 13h for CHS drives
53 cmp ah, 48h
[165]54 ja SHORT Int13h_UnsupportedFunction
[181]55 sub bl, 41h<<1 ; BX = Offset to eINT 13h jump table
56 jb SHORT Int13h_UnsupportedFunction
[165]57 jmp [cs:bx+g_rgwEbiosFunctionJumpTable]
[176]58%endif
[3]59
60;--------------------------------------------------------------------
[148]61; Int13h_UnsupportedFunction
[3]62; Int13h_DirectCallToAnotherBios
63; Parameters:
[148]64; DL: Translated drive number
[3]65; DS: RAMVARS segment
[150]66; SS:BP: Ptr to IDEPACK
[148]67; BX, DI: Corrupted on Int13h_DiskFunctionsHandler
[161]68; Other: Function specific INT 13h parameters
[3]69; Returns:
70; Depends on function
71; Corrupts registers:
72; Flags
73;--------------------------------------------------------------------
74ALIGN JUMP_ALIGN
75Int13h_UnsupportedFunction:
76Int13h_DirectCallToAnotherBios:
[148]77 call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
[150]78 mov bx, [bp+IDEPACK.intpack+INTPACK.bx]
79 mov di, [bp+IDEPACK.intpack+INTPACK.di]
80 mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
81 push WORD [bp+IDEPACK.intpack+INTPACK.flags]
[148]82 popf
83 push bp
[150]84 mov bp, [bp+IDEPACK.intpack+INTPACK.bp]
[148]85 int BIOS_DISK_INTERRUPT_13h ; Can safely do as much recursion as it wants
[3]86
[148]87 ; Store returned values to INTPACK
88 pop bp ; Standard INT 13h functions never uses BP as return register
89%ifdef USE_386
[150]90 mov [bp+IDEPACK.intpack+INTPACK.gs], gs
91 mov [bp+IDEPACK.intpack+INTPACK.fs], fs
[148]92%endif
[150]93 mov [bp+IDEPACK.intpack+INTPACK.es], es
94 mov [bp+IDEPACK.intpack+INTPACK.ds], ds
95 mov [bp+IDEPACK.intpack+INTPACK.di], di
96 mov [bp+IDEPACK.intpack+INTPACK.si], si
97 mov [bp+IDEPACK.intpack+INTPACK.bx], bx
98 mov [bp+IDEPACK.intpack+INTPACK.dh], dh
99 mov [bp+IDEPACK.intpack+INTPACK.cx], cx
100 mov [bp+IDEPACK.intpack+INTPACK.ax], ax
[148]101 pushf
[150]102 pop WORD [bp+IDEPACK.intpack+INTPACK.flags]
[148]103 call RamVars_GetSegmentToDS
104 cmp dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv]
105 je SHORT .ExchangeInt13hHandlers
[150]106 mov [bp+IDEPACK.intpack+INTPACK.dl], dl ; Something is returned in DL
[148]107ALIGN JUMP_ALIGN
108.ExchangeInt13hHandlers:
109 call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
110 ; Fall to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
[3]111
112
113;--------------------------------------------------------------------
[148]114; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
115; Int13h_ReturnFromHandlerWithoutStoringErrorCode
[32]116; Parameters:
[148]117; AH: BIOS Error code
[150]118; SS:BP: Ptr to IDEPACK
[32]119; Returns:
[148]120; All registers are loaded from INTPACK
[32]121;--------------------------------------------------------------------
122ALIGN JUMP_ALIGN
[148]123Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH:
[150]124 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
[148]125Int13h_ReturnFromHandlerWithoutStoringErrorCode:
[150]126 or WORD [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_IF ; Return with interrupts enabled
[148]127 mov sp, bp ; Now we can exit anytime
[155]128 RESTORE_FRAME_INTPACK_FROM_SSBP EXTRA_BYTES_FOR_INTPACK
[32]129
130
131;--------------------------------------------------------------------
[148]132; Int13h_CallPreviousInt13hHandler
[3]133; Parameters:
[148]134; AH: INT 13h function to call
135; DL: Drive number
136; DS: RAMVARS segment
[3]137; Returns:
138; Depends on function
139; Corrupts registers:
[148]140; BX, DI, ES
[3]141;--------------------------------------------------------------------
142ALIGN JUMP_ALIGN
[148]143Int13h_CallPreviousInt13hHandler:
[3]144 push di
[148]145 call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
146 int BIOS_DISK_INTERRUPT_13h
147 call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
148 pop di
149 ret
[35]150
[3]151
152;--------------------------------------------------------------------
[148]153; ExchangeCurrentInt13hHandlerWithOldInt13hHandler
[3]154; Parameters:
155; DS: RAMVARS segment
156; Returns:
[148]157; Nothing
[3]158; Corrupts registers:
[148]159; DI
[3]160;--------------------------------------------------------------------
161ALIGN JUMP_ALIGN
[148]162ExchangeCurrentInt13hHandlerWithOldInt13hHandler:
163 push es
164 LOAD_BDA_SEGMENT_TO es, di
165 mov di, [RAMVARS.fpOldI13h]
[150]166 cli
[148]167 xchg di, [es:BIOS_DISK_INTERRUPT_13h*4]
168 mov [RAMVARS.fpOldI13h], di
169 mov di, [RAMVARS.fpOldI13h+2]
170 xchg di, [es:BIOS_DISK_INTERRUPT_13h*4+2]
[181]171 sti
[148]172 mov [RAMVARS.fpOldI13h+2], di
173 pop es
174 ret
[28]175
[35]176
[150]177;--------------------------------------------------------------------
178; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
179; Int13h_SetErrorCodeToIntpackInSSBPfromAH
180; Parameters:
181; AH: BIOS error code (00h = no error)
182; SS:BP: Ptr to IDEPACK
183; Returns:
184; SS:BP: Ptr to IDEPACK with error condition set
185; Corrupts registers:
186; DS, DI
187;--------------------------------------------------------------------
188ALIGN JUMP_ALIGN
189Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH:
190 ; Store error code to BDA
191 LOAD_BDA_SEGMENT_TO ds, di
192 mov [BDA.bHDLastSt], ah
[35]193
[150]194 ; Store error code to INTPACK
195Int13h_SetErrorCodeToIntpackInSSBPfromAH:
196 mov [bp+IDEPACK.intpack+INTPACK.ah], ah
197 test ah, ah
198 jnz SHORT .SetCFtoIntpack
199 and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF
200 ret
201.SetCFtoIntpack:
202 or BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF
203 ret
204
205
[3]206; Jump table for correct BIOS function
207ALIGN WORD_ALIGN
208g_rgw13hFuncJump:
209 dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All)
210 dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All)
211 dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All)
212 dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All)
213 dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All)
[90]214 dw Int13h_UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA)
[3]215 dw Int13h_UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT)
216 dw Int13h_UnsupportedFunction ; 07h, Format Multiple Cylinders (XT)
217 dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All)
218 dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All)
219 dw Int13h_UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA)
220 dw Int13h_UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA)
221 dw AHCh_HandlerForSeek ; 0Ch, Seek (All)
222 dw AHDh_HandlerForResetHardDisk ; 0Dh, Alternate Disk Reset (All)
223 dw Int13h_UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
224 dw Int13h_UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
225 dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All)
226 dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All)
227 dw Int13h_UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT)
228 dw Int13h_UnsupportedFunction ; 13h, Drive Diagnostic (XT)
[90]229 dw Int13h_UnsupportedFunction ; 14h, Controller Internal Diagnostic (All)
[3]230 dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+)
[161]231 dw Int13h_UnsupportedFunction ; 16h,
232 dw Int13h_UnsupportedFunction ; 17h,
233 dw Int13h_UnsupportedFunction ; 18h,
[3]234 dw Int13h_UnsupportedFunction ; 19h, Park Heads (PS/2)
235 dw Int13h_UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2)
236 dw Int13h_UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2)
237 dw Int13h_UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2)
[161]238 dw Int13h_UnsupportedFunction ; 1Dh,
239 dw Int13h_UnsupportedFunction ; 1Eh,
240 dw Int13h_UnsupportedFunction ; 1Fh,
241 dw Int13h_UnsupportedFunction ; 20h,
[3]242 dw Int13h_UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1)
243 dw Int13h_UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1)
244 dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1)
245 dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1)
246 dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1)
[165]247
[176]248%ifdef MODULE_EBIOS
[165]249g_rgwEbiosFunctionJumpTable:
250 dw AH41h_HandlerForCheckIfExtensionsPresent ; 41h, Check if Extensions Present (EBIOS)*
251 dw AH42h_HandlerForExtendedReadSectors ; 42h, Extended Read Sectors (EBIOS)*
252 dw AH43h_HandlerForExtendedWriteSectors ; 43h, Extended Write Sectors (EBIOS)*
253 dw AH44h_HandlerForExtendedVerifySectors ; 44h, Extended Verify Sectors (EBIOS)*
254 dw Int13h_UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS)***
255 dw Int13h_UnsupportedFunction ; 46h, Eject Media Request (EBIOS)***
256 dw AH47h_HandlerForExtendedSeek ; 47h, Extended Seek (EBIOS)*
257 dw AH48h_HandlerForGetExtendedDriveParameters ; 48h, Get Extended Drive Parameters (EBIOS)*
[150]258; dw Int13h_UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS)***
[3]259; dw Int13h_UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM)
260; dw Int13h_UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM)
261; dw Int13h_UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM)
262; dw Int13h_UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM)
[150]263; dw Int13h_UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS)**
264;
265; * = Enhanced Drive Access Support (minimum required EBIOS functions)
266; ** = Enhanced Disk Drive (EDD) Support
267; *** = Drive Locking and Ejecting Support
[181]268%endif
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