source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h.asm@ 258

Last change on this file since 258 was 258, checked in by gregli@…, 12 years ago

Added floppy drive emulation over the serial connection (MODULE_SERIAL_FLOPPY). Along the way, various optimizations were made to stay within the 8K ROM size target. Also, serial code now returns the number of sectors transferred.

File size: 11.9 KB
Line 
1; Project name : XTIDE Universal BIOS
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;
11; Note to developers: Do not make recursive INT 13h calls!
12;
13; Int13h_DiskFunctionsHandler
14; Parameters:
15; AH: Bios function
16; DL: Drive number
17; Other: Depends on function
18; Returns:
19; Depends on function
20;--------------------------------------------------------------------
21ALIGN JUMP_ALIGN
22Int13h_DiskFunctionsHandler:
23 sti ; Enable interrupts
24 cld ; String instructions to increment pointers
25 CREATE_FRAME_INTPACK_TO_SSBP EXTRA_BYTES_FOR_INTPACK
26
27 call RamVars_GetSegmentToDS
28 call DriveXlate_ToOrBack
29 mov [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv], dl
30 call RamVars_IsFunctionHandledByThisBIOS
31 jc SHORT Int13h_DirectCallToAnotherBios
32
33 call FindDPT_ForDriveNumber ; DS:DI now points to DPT
34
35 ; Jump to correct BIOS function
36 eMOVZX bx, ah
37 shl bx, 1
38 cmp ah, 25h ; Possible EBIOS function?
39%ifdef MODULE_EBIOS
40 ja SHORT .JumpToEbiosFunction
41%else
42 ja SHORT Int13h_UnsupportedFunction
43%endif
44 jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
45
46%ifdef MODULE_EBIOS
47 ; Jump to correct EBIOS function
48ALIGN JUMP_ALIGN
49.JumpToEbiosFunction:
50 test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA
51 jz SHORT Int13h_UnsupportedFunction ; No eINT 13h for CHS drives
52 cmp ah, 48h
53 ja SHORT Int13h_UnsupportedFunction
54 sub bl, 41h<<1 ; BX = Offset to eINT 13h jump table
55 jb SHORT Int13h_UnsupportedFunction
56 jmp [cs:bx+g_rgwEbiosFunctionJumpTable]
57%endif
58
59;--------------------------------------------------------------------
60; Int13h_UnsupportedFunction
61; Int13h_DirectCallToAnotherBios
62; Parameters:
63; DL: Translated drive number
64; DS: RAMVARS segment
65; SS:BP: Ptr to IDEPACK
66; BX, DI: Corrupted on Int13h_DiskFunctionsHandler
67; Other: Function specific INT 13h parameters
68; Returns:
69; Depends on function
70; Corrupts registers:
71; Flags
72;--------------------------------------------------------------------
73ALIGN JUMP_ALIGN
74Int13h_UnsupportedFunction:
75Int13h_DirectCallToAnotherBios:
76 call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
77 mov bx, [bp+IDEPACK.intpack+INTPACK.bx]
78 mov di, [bp+IDEPACK.intpack+INTPACK.di]
79 mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
80 push WORD [bp+IDEPACK.intpack+INTPACK.flags]
81 popf
82 push bp
83 mov bp, [bp+IDEPACK.intpack+INTPACK.bp]
84 int BIOS_DISK_INTERRUPT_13h ; Can safely do as much recursion as it wants
85
86 ; Store returned values to INTPACK
87 pop bp ; Standard INT 13h functions never uses BP as return register
88%ifdef USE_386
89 mov [bp+IDEPACK.intpack+INTPACK.gs], gs
90 mov [bp+IDEPACK.intpack+INTPACK.fs], fs
91%endif
92 mov [bp+IDEPACK.intpack+INTPACK.es], es
93 mov [bp+IDEPACK.intpack+INTPACK.ds], ds
94 mov [bp+IDEPACK.intpack+INTPACK.di], di
95 mov [bp+IDEPACK.intpack+INTPACK.si], si
96 mov [bp+IDEPACK.intpack+INTPACK.bx], bx
97 mov [bp+IDEPACK.intpack+INTPACK.dh], dh
98 mov [bp+IDEPACK.intpack+INTPACK.cx], cx
99 mov [bp+IDEPACK.intpack+INTPACK.ax], ax
100 pushf
101 pop WORD [bp+IDEPACK.intpack+INTPACK.flags]
102 call RamVars_GetSegmentToDS
103 cmp dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv]
104 je SHORT .ExchangeInt13hHandlers
105 mov [bp+IDEPACK.intpack+INTPACK.dl], dl ; Something is returned in DL
106ALIGN JUMP_ALIGN
107.ExchangeInt13hHandlers:
108%ifdef USE_186
109 push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
110 jmp SHORT ExchangeCurrentInt13hHandlerWithOldInt13hHandler
111%else
112 call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
113 jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
114%endif
115
116
117;--------------------------------------------------------------------
118; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL
119; Parameters:
120; AH: BIOS Error code
121; CL: Number of sectors actually transferred
122; SS:BP: Ptr to IDEPACK
123; Returns:
124; All registers are loaded from INTPACK
125;--------------------------------------------------------------------
126ALIGN JUMP_ALIGN
127Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL:
128 mov [bp+IDEPACK.intpack+INTPACK.al], cl
129 ; Fall to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
130
131;--------------------------------------------------------------------
132; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
133; Int13h_ReturnFromHandlerWithoutStoringErrorCode
134; Parameters:
135; AH: BIOS Error code
136; SS:BP: Ptr to IDEPACK
137; Returns:
138; All registers are loaded from INTPACK
139;--------------------------------------------------------------------
140ALIGN JUMP_ALIGN
141Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH:
142%ifdef MODULE_SERIAL_FLOPPY
143 mov al, [bp+IDEPACK.intpack+INTPACK.dl]
144Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH_ALHasDriveNumber:
145 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber
146%else
147 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
148%endif
149Int13h_ReturnFromHandlerWithoutStoringErrorCode:
150 or WORD [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_IF ; Return with interrupts enabled
151 mov sp, bp ; Now we can exit anytime
152 RESTORE_FRAME_INTPACK_FROM_SSBP EXTRA_BYTES_FOR_INTPACK
153
154
155;--------------------------------------------------------------------
156; Int13h_CallPreviousInt13hHandler
157; Parameters:
158; AH: INT 13h function to call
159; DL: Drive number
160; DS: RAMVARS segment
161; Returns:
162; Depends on function
163; NOTE: ES:DI needs to be returned from the previous interrupt
164; handler, for floppy DPT in function 08h
165; Corrupts registers:
166; None
167;--------------------------------------------------------------------
168ALIGN JUMP_ALIGN
169Int13h_CallPreviousInt13hHandler:
170 call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
171 int BIOS_DISK_INTERRUPT_13h
172;;; fall-through to ExchangeCurrentInt13hHandlerWithOldInt13hHandler
173
174;--------------------------------------------------------------------
175; ExchangeCurrentInt13hHandlerWithOldInt13hHandler
176; Parameters:
177; DS: RAMVARS segment
178; Returns:
179; Nothing
180; Corrupts registers:
181; Nothing
182; Note: Flags are preserved
183;--------------------------------------------------------------------
184ALIGN JUMP_ALIGN
185ExchangeCurrentInt13hHandlerWithOldInt13hHandler:
186 push es
187 push si
188 LOAD_BDA_SEGMENT_PRESERVE_FLAGS_TO es, si
189 mov si, [RAMVARS.fpOldI13h]
190 cli
191 xchg si, [es:BIOS_DISK_INTERRUPT_13h*4]
192 mov [RAMVARS.fpOldI13h], si
193 mov si, [RAMVARS.fpOldI13h+2]
194 xchg si, [es:BIOS_DISK_INTERRUPT_13h*4+2]
195 sti
196 mov [RAMVARS.fpOldI13h+2], si
197 pop si
198 pop es
199 ret
200
201
202;--------------------------------------------------------------------
203; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
204; Int13h_SetErrorCodeToIntpackInSSBPfromAH
205; Parameters:
206; AH: BIOS error code (00h = no error)
207; SS:BP: Ptr to IDEPACK
208; Returns:
209; SS:BP: Ptr to IDEPACK with error condition set
210; Corrupts registers:
211; DS, DI
212;--------------------------------------------------------------------
213ALIGN JUMP_ALIGN
214%ifdef MODULE_SERIAL_FLOPPY
215Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber:
216 ; Store error code to BDA
217 mov bx, BDA.bHDLastSt
218 test al, al
219 js .HardDisk
220 mov bl, BDA.bFDRetST & 0xff
221.HardDisk:
222 LOAD_BDA_SEGMENT_TO ds, di
223 mov [bx], ah
224%else
225Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH:
226 ; Store error code to BDA
227 LOAD_BDA_SEGMENT_TO ds, di
228 mov [BDA.bHDLastSt], ah
229%endif
230
231 ; Store error code to INTPACK
232Int13h_SetErrorCodeToIntpackInSSBPfromAH:
233 mov [bp+IDEPACK.intpack+INTPACK.ah], ah
234 test ah, ah
235 jnz SHORT .SetCFtoIntpack
236 and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF
237 ret
238.SetCFtoIntpack:
239 or BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF
240 ret
241
242
243; Jump table for correct BIOS function
244ALIGN WORD_ALIGN
245g_rgw13hFuncJump:
246 dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All)
247 dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All)
248 dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All)
249 dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All)
250 dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All)
251 dw Int13h_UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA)
252 dw Int13h_UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT)
253 dw Int13h_UnsupportedFunction ; 07h, Format Multiple Cylinders (XT)
254 dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All)
255 dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All)
256 dw Int13h_UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA)
257 dw Int13h_UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA)
258 dw AHCh_HandlerForSeek ; 0Ch, Seek (All)
259 dw AHDh_HandlerForResetHardDisk ; 0Dh, Alternate Disk Reset (All)
260 dw Int13h_UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
261 dw Int13h_UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
262 dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All)
263 dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All)
264 dw Int13h_UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT)
265 dw Int13h_UnsupportedFunction ; 13h, Drive Diagnostic (XT)
266 dw Int13h_UnsupportedFunction ; 14h, Controller Internal Diagnostic (All)
267 dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+)
268 dw Int13h_UnsupportedFunction ; 16h,
269 dw Int13h_UnsupportedFunction ; 17h,
270 dw Int13h_UnsupportedFunction ; 18h,
271 dw Int13h_UnsupportedFunction ; 19h, Park Heads (PS/2)
272 dw Int13h_UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2)
273 dw Int13h_UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2)
274 dw Int13h_UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2)
275 dw Int13h_UnsupportedFunction ; 1Dh,
276 dw Int13h_UnsupportedFunction ; 1Eh,
277 dw Int13h_UnsupportedFunction ; 1Fh,
278 dw Int13h_UnsupportedFunction ; 20h,
279 dw Int13h_UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1)
280 dw Int13h_UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1)
281 dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1)
282 dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1)
283 dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1)
284
285%ifdef MODULE_EBIOS
286g_rgwEbiosFunctionJumpTable:
287 dw AH41h_HandlerForCheckIfExtensionsPresent ; 41h, Check if Extensions Present (EBIOS)*
288 dw AH42h_HandlerForExtendedReadSectors ; 42h, Extended Read Sectors (EBIOS)*
289 dw AH43h_HandlerForExtendedWriteSectors ; 43h, Extended Write Sectors (EBIOS)*
290 dw AH44h_HandlerForExtendedVerifySectors ; 44h, Extended Verify Sectors (EBIOS)*
291 dw Int13h_UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS)***
292 dw Int13h_UnsupportedFunction ; 46h, Eject Media Request (EBIOS)***
293 dw AH47h_HandlerForExtendedSeek ; 47h, Extended Seek (EBIOS)*
294 dw AH48h_HandlerForGetExtendedDriveParameters ; 48h, Get Extended Drive Parameters (EBIOS)*
295; dw Int13h_UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS)***
296; dw Int13h_UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM)
297; dw Int13h_UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM)
298; dw Int13h_UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM)
299; dw Int13h_UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM)
300; dw Int13h_UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS)**
301;
302; * = Enhanced Drive Access Support (minimum required EBIOS functions)
303; ** = Enhanced Disk Drive (EDD) Support
304; *** = Drive Locking and Ejecting Support
305%endif
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