source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/Interrupts.asm@ 625

Last change on this file since 625 was 621, checked in by Krister Nordvall, 3 years ago

Changes:

  • Fixed three different bugs all causing the boot menu to show drives using IRQs even though the BIOS had been built without MODULE_IRQ.
  • Fixed two bugs in XTIDECFG where loading a BIOS from file and then loading the old settings from EEPROM would
    • overwrite ROMVARS.wFlags in the loaded BIOS file (in RAM). The possibly resulting mismatch of module flags could make it impossible to change settings for modules included in the BIOS or allow changing settings for modules not included in the BIOS.
    • not copy the color theme over to the loaded BIOS.
  • Also fixed two very minor bugs in XTIDECFG in BiosFile_LoadFileFromDSSItoRamBuffer and BiosFile_SaveRamBufferToFileInDSSI where the error handling in these routines would close whatever file handle that happened to match the error code returned by DOS in AX.
  • Made significant changes to the new flash ROM programming routines to reduce the size. Also fixed a minor bug that would cause the second verification to be skipped and return success when programming a 64 KB block of data.
  • Changed the custom BIOS build file names to the 8.3 format.
  • Changed some help strings in XTIDECFG to clarify things.
  • Other minor optimizations and fixes.
File size: 9.0 KB
RevLine 
[90]1; Project name : XTIDE Universal BIOS
[33]2; Description : Functions for initializing the BIOS.
3
[376]4;
[491]5; XTIDE Universal BIOS and Associated Tools
[526]6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
[376]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.
[491]12;
[376]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
[491]16; GNU General Public License for more details.
[376]17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
[491]18;
[376]19
[33]20; Section containing code
21SECTION .text
22
23;--------------------------------------------------------------------
[580]24; Drives must be detected before this function is called unless
25; MODULE_DRIVEXLATE has been included in the BIOS.
[431]26;
[33]27; Interrupts_InitializeInterruptVectors
28; Parameters:
29; DS: RAMVARS segment
30; ES: BDA and Interrupt Vector segment (zero)
31; Returns:
32; Nothing
33; Corrupts registers:
34; All except segments
[86]35;--------------------------------------------------------------------
[33]36Interrupts_InitializeInterruptVectors:
[431]37 ; Install INT 19h handler to properly reset the system
38 mov al, BIOS_BOOT_LOADER_INTERRUPT_19h ; INT 19h interrupt vector offset
39 mov si, Int19hReset_Handler ; INT 19h handler to reboot the system
40 call Interrupts_InstallHandlerToVectorInALFromCSSI
41
42 ; If no drives detected, leave system INT 13h and 40h handlers
43 ; in place. We need our INT 13h handler to swap drive letters.
[492]44%ifndef MODULE_DRIVEXLATE
[431]45 cmp BYTE [RAMVARS.bDrvCnt], 0
[489]46 je SHORT Interrupts_InstallHandlerToVectorInALFromCSSI.Interrupts_Return
[431]47%endif
[97]48 ; Fall to .InitializeInt13hAnd40h
[33]49
50;--------------------------------------------------------------------
[97]51; .InitializeInt13hAnd40h
[33]52; Parameters:
53; DS: RAMVARS segment
54; ES: BDA and Interrupt Vector segment (zero)
55; Returns:
56; Nothing
57; Corrupts registers:
58; AX, BX, CX, DX, SI, DI
[86]59;--------------------------------------------------------------------
[97]60.InitializeInt13hAnd40h:
[594]61%ifdef MODULE_MFM_COMPATIBILITY
[181]62 mov ax, [es:BIOS_DISK_INTERRUPT_13h*4+2]; Load old INT 13h segment
[594]63 mov [RAMVARS.fpMFMint13h+2], ax ; Store old INT 13h segment
64 xchg dx, ax
65 mov ax, [es:BIOS_DISK_INTERRUPT_13h*4] ; Load old INT 13h offset
66 mov [RAMVARS.fpMFMint13h], ax ; Store old INT 13h offset
[596]67
[594]68 mov [RAMVARS.fpOldI13h+2], cs
[596]69 mov WORD [RAMVARS.fpOldI13h], Int13hMFMcompatibilityHandler
[594]70%else
71 mov ax, [es:BIOS_DISK_INTERRUPT_13h*4+2]; Load old INT 13h segment
[181]72 mov [RAMVARS.fpOldI13h+2], ax ; Store old INT 13h segment
73 xchg dx, ax
[152]74 mov ax, [es:BIOS_DISK_INTERRUPT_13h*4] ; Load old INT 13h offset
[33]75 mov [RAMVARS.fpOldI13h], ax ; Store old INT 13h offset
[594]76%endif
[181]77
[33]78 ; Only store INT 13h handler to 40h if 40h is not already installed.
79 ; At least AMI BIOS for 286 stores 40h handler by itself and calls
[530]80 ; 40h from 13h. That system locks to infinite loop if we blindly copy 13h to 40h.
[33]81 call FloppyDrive_IsInt40hInstalled
[243]82 jc SHORT .Int40hAlreadyInstalled
[152]83 mov [es:BIOS_DISKETTE_INTERRUPT_40h*4], ax ; Store old INT 13h offset
84 mov [es:BIOS_DISKETTE_INTERRUPT_40h*4+2], dx ; Store old INT 13h segment
[243]85.Int40hAlreadyInstalled:
[258]86
87 mov al, BIOS_DISK_INTERRUPT_13h ; INT 13h interrupt vector offset
[522]88%ifdef RELOCATE_INT13H_STACK
89 mov si, Int13h_DiskFunctionsHandlerWithStackChange
90%else
[417]91 mov si, Int13h_DiskFunctionsHandler
92%endif
[392]93
[398]94%ifndef MODULE_IRQ
95 ; Fall to Interrupts_InstallHandlerToVectorInALFromCSSI
96%else
[392]97 call Interrupts_InstallHandlerToVectorInALFromCSSI
[97]98 ; Fall to .InitializeHardwareIrqHandlers
[33]99
100;--------------------------------------------------------------------
[97]101; .InitializeHardwareIrqHandlers
[33]102; Parameters:
103; ES: BDA and Interrupt Vector segment (zero)
104; Returns:
105; Nothing
106; Corrupts registers:
[258]107; BX, CX, DX, SI, DI, AX
[86]108;--------------------------------------------------------------------
[97]109.InitializeHardwareIrqHandlers:
[33]110 call RamVars_GetIdeControllerCountToCX
[558]111 mov di, ROMVARS.ideVars0+IDEVARS.bIRQ
[33]112.IdeControllerLoop:
[491]113 mov al, [cs:di]
[33]114 add di, BYTE IDEVARS_size ; Increment to next controller
115 call .InstallLowOrHighIrqHandler
116 loop .IdeControllerLoop
[86]117.Return:
118 ret ; This ret is shared with .InstallLowOrHighIrqHandler
[33]119
120;--------------------------------------------------------------------
121; .InstallLowOrHighIrqHandler
122; Parameters:
[258]123; AL: IRQ number, 0 if IRQ disabled
[33]124; ES: BDA and Interrupt Vector segment (zero)
125; Returns:
126; Nothing
127; Corrupts registers:
128; BX, SI
[86]129;--------------------------------------------------------------------
[33]130.InstallLowOrHighIrqHandler:
[258]131 test al, al
[86]132 jz SHORT .Return ; IRQ not used
[540]133%ifdef USE_AT
[258]134 cmp al, 8
[86]135 jb SHORT .InstallLowIrqHandler
[162]136 ; Fall to .InstallHighIrqHandler
[33]137
138;--------------------------------------------------------------------
139; .InstallHighIrqHandler
140; Parameters:
141; BX: IRQ number (8...15)
142; ES: BDA and Interrupt Vector segment (zero)
143; Returns:
144; Nothing
145; Corrupts registers:
[258]146; AL, BX, SI
[86]147;--------------------------------------------------------------------
[97]148.InstallHighIrqHandler:
[258]149 add al, BYTE HARDWARE_IRQ_8_INTERRUPT_70h - 8 ; Interrupt vector number
[150]150 mov si, IdeIrq_InterruptServiceRoutineForIrqs8to15
[258]151 jmp SHORT Interrupts_InstallHandlerToVectorInALFromCSSI
[540]152%endif ; USE_AT
[33]153
154;--------------------------------------------------------------------
155; .InstallLowIrqHandler
156; Parameters:
[258]157; AL: IRQ number (0...7)
[33]158; ES: BDA and Interrupt Vector segment (zero)
159; Returns:
160; Nothing
161; Corrupts registers:
[258]162; AL, BX, SI
[86]163;--------------------------------------------------------------------
[33]164.InstallLowIrqHandler:
[258]165 add al, BYTE HARDWARE_IRQ_0_INTERRUPT_08h ; Interrupt vector number
[150]166 mov si, IdeIrq_InterruptServiceRoutineForIrqs2to7
[258]167 ; Fall to Interrupts_InstallHandlerToVectorInALFromCSSI
[398]168%endif ; MODULE_IRQ
[33]169
170
171;--------------------------------------------------------------------
[258]172; Interrupts_InstallHandlerToVectorInALFromCSSI
[33]173; Parameters:
[258]174; AL: Interrupt vector number (for example 13h)
[33]175; ES: BDA and Interrupt Vector segment (zero)
176; CS:SI: Ptr to interrupt handler
177; Returns:
178; Nothing
179; Corrupts registers:
[258]180; AX, BX
[86]181;--------------------------------------------------------------------
[258]182Interrupts_InstallHandlerToVectorInALFromCSSI:
183 mov bl, 4 ; Shift for DWORD offset, MUL smaller than other alternatives
184 mul bl
185 xchg ax, bx
[599]186 cli
[33]187 mov [es:bx], si ; Store offset
188 mov [es:bx+2], cs ; Store segment
[599]189 sti
[489]190.Interrupts_Return:
[33]191 ret
192
193
[398]194%ifdef MODULE_IRQ
[33]195;--------------------------------------------------------------------
196; Interrupts_UnmaskInterruptControllerForDriveInDSDI
197; Parameters:
198; DS:DI: Ptr to DPT
199; Returns:
200; Nothing
201; Corrupts registers:
202; AX, BX, DX
203;--------------------------------------------------------------------
204Interrupts_UnmaskInterruptControllerForDriveInDSDI:
[621]205 eMOVZX bx, [di+DPT.bIdevarsOffset] ; Clears CF on pre-386 CPUs
206%ifndef USE_386
207%ifdef USE_UNDOC_INTEL
208 salc
209 or al, [cs:bx+IDEVARS.bIRQ]
210%else
[33]211 mov al, [cs:bx+IDEVARS.bIRQ]
[86]212 test al, al
[621]213%endif
214%else ; USE_386
215 mov al, [cs:bx+IDEVARS.bIRQ]
216 test al, al
217%endif
[86]218 jz SHORT .Return ; Interrupts disabled
[33]219 cmp al, 8
[86]220 jb SHORT .UnmaskLowIrqController
[162]221 ; Fall to .UnmaskHighIrqController
[33]222
223;--------------------------------------------------------------------
224; .UnmaskHighIrqController
225; Parameters:
226; AL: IRQ number (8...15)
227; Returns:
228; Nothing
229; Corrupts registers:
230; AX, DX
231;--------------------------------------------------------------------
[97]232.UnmaskHighIrqController:
[33]233 sub al, 8 ; Slave interrupt number
[152]234 mov dx, SLAVE_8259_IMR
[33]235 call .ClearBitFrom8259MaskRegister
236 mov al, 2 ; Master IRQ 2 to allow slave IRQs
237 ; Fall to .UnmaskLowIrqController
238
239;--------------------------------------------------------------------
240; .UnmaskLowIrqController
241; Parameters:
242; AL: IRQ number (0...7)
243; Returns:
244; Nothing
245; Corrupts registers:
246; AX, DX
247;--------------------------------------------------------------------
248.UnmaskLowIrqController:
[152]249 mov dx, MASTER_8259_IMR
[33]250 ; Fall to .ClearBitFrom8259MaskRegister
251
252;--------------------------------------------------------------------
253; .ClearBitFrom8259MaskRegister
254; Parameters:
255; AL: 8259 interrupt index (0...7)
256; DX: Port address to Interrupt Mask Register
257; Returns:
258; Nothing
259; Corrupts registers:
260; AX
261;--------------------------------------------------------------------
262.ClearBitFrom8259MaskRegister:
263 push cx
[592]264 xchg cx, ax ; IRQ index to CL
265 in al, dx ; Read Interrupt Mask Register
[596]266%ifdef USE_NEC_V
267 eCLR1 al, cl ; Clear wanted bit
268%else
[589]269 mov ch, ~1 ; Load bit mask to be rotated
270 rol ch, cl ; Rotate mask to correct position for clearing
[33]271 and al, ch ; Clear wanted bit
[596]272%endif
[33]273 out dx, al ; Write modified Interrupt Mask Register
274 pop cx
[86]275.Return:
[33]276 ret
[398]277
278%endif ; MODULE_IRQ
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