--- hatari/src/uae-cpu/hatari-glue.c 2019/04/01 07:09:47 1.1.1.3 +++ hatari/src/uae-cpu/hatari-glue.c 2019/04/01 07:13:11 1.1.1.10 @@ -1,3 +1,14 @@ +/* + Hatari - hatari-glue.c + + This file is distributed under the GNU Public License, version 2 or at + your option any later version. Read the file gpl.txt for details. + + This file contains some code to glue the UAE CPU core to the rest of the + emulator and Hatari's "illegal" opcodes. +*/ +const char HatariGlue_rcsid[] = "Hatari $Id: hatari-glue.c,v 1.1.1.10 2019/04/01 07:13:11 root Exp $"; + #include @@ -6,15 +17,14 @@ #include "../includes/tos.h" #include "../includes/gemdos.h" #include "../includes/cart.h" +#include "../includes/vdi.h" +#include "../includes/stMemory.h" -#ifndef UAESYSDEPS #include "sysdeps.h" -#endif -#ifndef UAEMEMORY -#include "memory.h" -#endif #include "maccess.h" +#include "memory.h" #include "newcpu.h" +#include "hatari-glue.h" #ifndef FALSE #define FALSE 0 @@ -22,129 +32,146 @@ #endif -int illegal_mem = FALSE; -int address_space_24 = 1; +int illegal_mem = TRUE; +int address_space_24 = TRUE; int cpu_level = 0; /* 68000 (default) */ -int cpu_compatible = 0; +int cpu_compatible = FALSE; -long STmem_size = 0x100000; /* 1MB */ -long TTmem_size = 0; +int pendingInterrupts = 0; /* Reset custom chips */ void customreset(void) { - /* Taken from Reset_ST in reset.c: */ - Int_Reset(); /* Reset interrupts */ - MFP_Reset(); /* Setup MFP chip */ - Video_Reset(); /* Reset video */ - PSG_Reset(); /* Reset PSG */ - Sound_Reset(); /* Reset Sound */ - IKBD_Reset(FALSE); /* Keyboard */ - Screen_Reset(); /* Reset screen */ - - /* And VBL interrupt, MUST always be one interrupt ready to trigger */ - Int_AddAbsoluteInterrupt(CYCLES_ENDLINE,INTERRUPT_VIDEO_ENDLINE); - Int_AddAbsoluteInterrupt(CYCLES_HBL,INTERRUPT_VIDEO_HBL); - Int_AddAbsoluteInterrupt(CYCLES_PER_FRAME,INTERRUPT_VIDEO_VBL); + pendingInterrupts = 0; } -/* Initialize 680x0 emulation, CheckROM() must have been called first */ +/* Return interrupt number (1 - 7), -1 means no interrupt. + * Note that the interrupt stays pending if it can't be executed yet + * due to the interrupt level field in the SR. */ +int intlev(void) +{ + /* There are only VBL and HBL autovector interrupts in the ST... */ + assert((pendingInterrupts & ~((1<<4)|(1<<2))) == 0); + + if(pendingInterrupts & (1 << 4)) /* VBL interrupt? */ + { + if(regs.intmask < 4) + pendingInterrupts &= ~(1 << 4); + return 4; + } + else if(pendingInterrupts & (1 << 2)) /* HBL interrupt? */ + { + if(regs.intmask < 2) + pendingInterrupts &= ~(1 << 2); + return 2; + } + + return -1; +} + + +/* Initialize 680x0 emulation */ int Init680x0(void) { - memory_init(); -fprintf(stderr, "TOS version: %x.%x\n", STMemory_ReadByte(2), STMemory_ReadByte(3)); -fprintf(stderr, "PC start: $%lx\n", STMemory_ReadLong(4)); - - init_m68k(); -#ifdef USE_COMPILER - compiler_init(); -#endif - return TRUE; + /* Note: memory_init() is now done in tos.c */ + + init_m68k(); + return TRUE; } /* Deinitialize 680x0 emulation */ void Exit680x0(void) { + memory_uninit(); + + free(table68k); + table68k = NULL; } /* Reset and start 680x0 emulation */ void Start680x0(void) { - m68k_reset(); - m68k_go(TRUE); + m68k_reset(); + m68k_go(TRUE); } -/* ----------------------------------------------------------------------- */ -/* - We use an illegal opcode to set ConnectedDrives, as TOS clears this - value we cannot set it on init. -*/ -unsigned long OpCode_ConnectedDrive(uae_u32 opcode) +/* Check if the CPU type has been changed */ +void check_prefs_changed_cpu(int new_level, int new_compatible) { - /*fprintf(stderr, "OpCode_ConnectedDrive handled\n");*/ - /* Set connected drives */ - STMemory_WriteWord(0x4c2, ConnectedDriveMask); - m68k_incpc(2); - fill_prefetch_0(); - return 4; + if(cpu_level!=new_level || cpu_compatible!=new_compatible) + { + cpu_level = new_level; + cpu_compatible = new_compatible; + set_special(SPCFLAG_MODE_CHANGE); + if (table68k) + build_cpufunctbl (); + } } + /* ----------------------------------------------------------------------- */ /* - Re-direct execution to old GEM calls, used in 'cart.s' + This function will be called at system init by the cartridge routine + (after gemdos init, before booting floppies). + + The GEMDOS vector (#$84) is setup and we also initialize the connected + drive mask and Line-A variables (for an extended VDI resolution) from here. */ -unsigned long OpCode_OldGemDos(uae_u32 opcode) +unsigned long OpCode_SysInit(uae_u32 opcode) { - m68k_setpc( STMemory_ReadLong(CART_OLDGEMDOS) ); + /* Initialize the connected drive mask */ + STMemory_WriteLong(0x4c2, ConnectedDriveMask); + + if(!bInitGemDOS) + { + /* Init on boot - see cart.c */ + GemDOS_Boot(); + + /* We use this to get pointer to Line-A structure details + * (to fix for extended VDI res) */ + LineABase = regs.regs[0]; /* D0 */ + FontBase = regs.regs[9]; /* A1 */ + VDI_LineA(); + } + + m68k_incpc(2); fill_prefetch_0(); return 4; } + /* ----------------------------------------------------------------------- */ /* - Intercept GEMDOS calls (setup vector $84) - The vector is setup when the gemdos-opcode is run the first time, by - the cartridge routine. (after gemdos init, before booting floppies) + Intercept GEMDOS calls - After this, our vector will be used, and handled by the GemDOS_OpCode - routine in gemdos.c + Used for GEMDOS HD emulation (see gemdos.c). */ unsigned long OpCode_GemDos(uae_u32 opcode) { + GemDOS_OpCode(); /* handler code in gemdos.c */ - if(!bInitGemDOS) - GemDOS_Boot(); /* Init on boot - see cartimg.c */ - else - GemDOS_OpCode(); /* handler code in gemdos.c */ - - m68k_incpc(2); - fill_prefetch_0(); - return 4; + m68k_incpc(2); + fill_prefetch_0(); + return 4; } -/* ----------------------------------------------------------------------- */ -/* - Modify TimerD in GEMDos to gain more desktop performance - Obviously, we need to emulate all timers correctly but GemDOS set's up Timer D at a very - high rate(every couple of instructions). The interrupts isn't enabled but WinSTon still - needs to process the interrupt table and this HALVES our frame rate!!! (It causes a cache - reload each time). Some games actually reference this timer but don't set it up(eg Paradroid, - Speedball I) so we simply intercept the Timer D setup code in GemDOS and fix the numbers - with more 'laid-back' values. This still keeps 100% compatibility +/*-----------------------------------------------------------------------*/ +/* + This is called after completion of each VDI call */ -unsigned long OpCode_TimerD(uae_u32 opcode) +unsigned long OpCode_VDI(uae_u32 opcode) { - /*fprintf(stderr, "OpCode_TimerD handled\n");*/ - m68k_dreg(regs,0)=3; /* 3 = Select Timer D */ - m68k_dreg(regs,1)=7; /* 1 = /4 for 9600 baud(used /200) */ - m68k_dreg(regs,2)=100; /* 2 = 9600 baud(100) */ - m68k_incpc(2); - fill_prefetch_0(); - return 4; + VDI_Complete(); + + /* Set PC back to where originated from to continue instruction decoding */ + m68k_setpc(VDI_OldPC); + + fill_prefetch_0(); + return 4; }