Start to implement EmulatorSimulate / EmulatorUnsimulate (used by VDDSimulate16 and VDDUnsimualte16). This piece of code can be better written, but it works for what I'm going to commit next.
svn path=/branches/ntvdm/; revision=62282
Part 2 of PIT + sound fix.
- Move port 61h management from speaker.c to the emulator.c module;
- Add PIT OUT callbacks support;
- Add (unimplemented) PitSetGate function (will be used later on).
Still WIP.
svn path=/branches/ntvdm/; revision=61866
Add two general-purpose variables to the interrupt handler stub stack.
Fix INT 29h so that it works correctly when the INT 10h, AH = 0Eh call is hooked.
svn path=/branches/ntvdm/; revision=61797
- Move all the hardware initialization to EmulatorInitialize (since emulator.c can be viewed as support functions for emulating a PC motherboard) --> PS2 and VGA go there.
- Break bios.c into bios.c and kbdbios.c (the keyboard bios module) (according to the IBM documentation as well as other emulator sources or SeaBIOS or...).
- Move Exception handling from int32.c to emulator.c, because it's something tight to the emulator, not to the interrupt system by itself (yet it happens that INT 00h to 07h are commonly set to some exception handlers). In the bios.c, initialize those vectors with the default exception handler.
- Handling IRQs is done fully in bios.c now: introduce PicSetIRQMask and EnableHwIRQ helper functions (adapted from their equivalents from SeaBIOS) that allows the bios to set (and activate in the PIC) a given IRQ with its corresponding handler. Also introduce PicIRQComplete that serves as a PIC IRQ completer (i.e. sends the EOI to the right PIC(s)).
- Continuing on that, at the moment I set dumb default PIC IRQ handlers for IRQ 08h - 0Fh and IRQ 70h - 77h).
- By default I disable all the IRQs; there are then set on-demand with EnableHwIRQ.
- Rework the POST (aka. BiosInitialize function):
* the memory size is now get from the CMOS (as well as the extended memory size via INT 12h, AH=88h),
* then we initialize the interrupts,
* then platform hardware (ie. the chips) are initialized,
* and finally the keyboard and video bioses.
- As said before, move memory sizes into the CMOS.
- Simplify video bios initialization.
svn path=/branches/ntvdm/; revision=61796
Declare some VDM memory services.
[NTVDM]
- Almost all of the XXXInitialize functions just return TRUE always, so VOIDify them instead (since they always succeed).
- Move almost all of the hardware initialization inside EmulatorInitialize.
- Move pure console initialization/mode-saving/cleanup code into ConsoleInit/Cleanup functions in ntvdm.c instead of in bios.c.
svn path=/branches/ntvdm/; revision=61588
- Move some PS/2 initialization from bios.c to ps2.c
- NULLify interrupt entries which are in fact pointers to data tables.
- Add a framework for adding I/O port handlers.
svn path=/branches/ntvdm/; revision=61107
- Implement and export getEFLAGS and setEFLAGS.
- Do some code reorganization (move all registers-related functions into "registers.c").
svn path=/branches/ntvdm/; revision=61033
Finish my Interruption revamp.
- Move interrupt-related code from bop.c to int32.c
- Introduce InitializeInt32 helper so that one can initialize all the needed 16-bit stubs for the 32-bit interrupts.
- Remove unneeded defines in emulator.h and an exported variable in ntvdm.h.
svn path=/branches/ntvdm/; revision=60908
Start my work on modularizing registration of "32-bit" interrupts, i.e.
interrupts that are implemented in 32-bit mode, but are stubbed with 16-bit
code (so that 16-bit apps can call them).
The 16-bit stub code uses a BOP call to our Control BOP function (BOP 0xFF) which
can handle in theory many sub-functions (as the BOP 0x58 documented here: http://www.ragestorm.net/tutorial?id=27)
specified as an additional BYTE in the call:
0xC4 0xC4 bop_code <optional_bop_subfunction>
Here, for calling 32-bit interrupts we use our BOP 0xFF, subfunction 0xFF.
The final aim would be to generate the 16-bit stub code when one calls the RegisterInt32 helper function
(contrary to what's happening now, that is, the 16-bit stub code is generated for all of the interrupts
at BIOS initialization time, and we use it for BIOS and DOS interrupts).
svn path=/branches/ntvdm/; revision=60907
Make the emulator callbacks non-static.
In BiosPrintCallback, use EmulatorWriteMemory instead of VgaWriteMemory, because
VgaWriteMemory does not do any input validation.
Improve EmulatorWriteMemory input validation and bound checking.
svn path=/branches/ntvdm/; revision=60903
Fix the type of a variable.
[NTVDM]
Introduce a BOP handler table for the 256 possible BOP functions and use it.
svn path=/branches/ntvdm/; revision=60818
- Introduce a Fast486Initialize which is used to set up the CPU callbacks (and use default ones if some of the given callbacks are NULL), and to reset it the first time. Now Fast486Reset is meant to be used for only resetting the CPU to a safe state.
- Hence we are now sure that State->WhateverCallback is never NULL (and is theoretically valid), so don't do NULL-checks when calling them, but call them directly. The default cases for those checks become the default calls for the default callbacks.
- Remove the now-unneeded EmulatorIdle function.
svn path=/branches/ntvdm/; revision=60814
BOP numbers are 1 byte and map to a function (over 255). But one can pass additional "parameters" to those functions by adding extra bytes, however such functions must advance "by hand" the instruction pointer.
[NTVDM]
- Take into account our previous remark for the BIOS interrupt stubs, and comment them.
- Rework EmulatorBiosOperation (move almost all of its existing code into subfunctions in bop.c) so that one can call many other BOP functions in the future (WIP). The BOP number (still called) EMULATOR_INT_BOP (of value 0xFF) is used for internal 16 --> 32 bit switching for our 32bit bios.
- It appears that the IoRead/WriteCallback and IdleCallback must not be NULL for using fast486. I'm committing a temporary fix that I will definitely fix in a subsequent commit.
svn path=/branches/ntvdm/; revision=60812
Separate external interrupts from interrupt signals (which are
interrupts whose number is not known until they can be serviced,
just like hardware interrupts on a real CPU).
[NTVDM]
Improve the PIC emulation code (IRQ priorities, etc...).
Instead of checking for interrupts in the main loop, move the
PS/2 input parsing to a different thread.
Improve BIOS keyboard IRQ handling.
svn path=/branches/ntvdm/; revision=60761
Remove the code that performs waiting in 32-bit mode since that blocks the emulator
and prevents interrupts from working.
Implement a 16-bit waiting system in the interrupt handlers.
Fix the PS/2 interrupt code.
svn path=/branches/ntvdm/; revision=60739
Implement the LES and LDS instructions.
Add optional support for BOPs (NTVDM-specific).
Fix prefix handling in some functions.
[NTVDM]
Enable BOPs for Soft386 (when NEW_EMULATOR is defined).
Fix the calling convention issue (softx86 uses cdecl, soft386 uses stdcall).
svn path=/branches/ntvdm/; revision=60395
Synchronize with trunk again to fix important bugs in the build system.
Implement register control functions which should be exported (Adapted from a patch by Hermes Belusca-Maito).
The actual export is temporarily disabled because a bug in the build system compiles ntvdm as a DLL instead of an EXE.
svn path=/branches/ntvdm/; revision=59684
Modify the flags on the stack instead of the flags register directly.
The flags register is restored during IRET so changing it directly does nothing.
svn path=/branches/ntvdm/; revision=59566
Remove the old "INT 0xFF" hack and instead use an invalid opcode sequence for emulator operations.
Fix the flags register update bug.
svn path=/branches/ntvdm/; revision=59565
Fix jump conditions.
[NTVDM]
Implement BIOS teletype output command.
Start implementation of a new CPU emulator to replace softx86.
svn path=/branches/ntvdm/; revision=59450
Fix bugs in video memory access emulation.
Implement several missing INT 10h functions.
Resize the console screen buffer on startup.
svn path=/branches/ntvdm/; revision=59421
Fix several bugs:
The file was not entirely read due to an integer overflow.
The second WORD of the Program Segment Prefix (PSP) is not the number of allocated
paragraphs, but the segment of the last paragraph.
Fix the order of registers (SI and DI were mixed up with SP and BP).
Implement interrupt 0x11.
Implement redirection for reading/writing characters.
svn path=/branches/ntvdm/; revision=59409
