/***************************************************************************** * * m4510.c * Portable 4510 emulator V1.0beta1 * * Copyright Peter Trauner, all rights reserved * documentation preliminary databook * documentation by michael steil mist@c64.org * available at ftp://ftp.funet.fi/pub/cbm/c65 * * - This source code is released as freeware for non-commercial purposes. * - You are free to use and redistribute this code in modified or * unmodified form, provided you list me in the credits. * - If you modify this source code, you must add a notice to each modified * source file that it has been changed. If you're a nice person, you * will clearly mark each change too. :) * - If you wish to use this for commercial purposes, please contact me at * pullmoll@t-online.de * - The author of this copywritten work reserves the right to change the * terms of its usage and license at any time, including retroactively * - This entire notice must remain in the source code. * *****************************************************************************/ /* c65 memory management (reset) c64 ff c65 20 (interface) a (c65 mode) a:00 x:e3 y:00 z:b3 c65 64 (interface) c64 ff b (c65 dosmode?) c65 65 (interface, full colorram) a:00 x:11 y:80 z:31 c64 ff c (?) c64 07 a:00 x:00 y:00 z:00 a c65 mode diskcontroller accesses monitor c64 ff a:a0 x:82 y:00 z:83 c64 mode c65 0 c65 2f:0 ! c64 ff a:00 x:00 y:00 z:00 internal 8 mb to 64k switching (jmp routine in rom) ( seams to be incomplete, in chapter 1 1megabyte memory mapper ) a x y z g 0 00 e0 00 f0 g 10000 00 e1 00 f1 g 20000 00 e2 00 f2 g 30000 00 e3 00 f3 g 40000 00 e4 00 f4 g 50000 00 e5 00 f5 g 60000 00 e6 00 f6 . . g f0000 00 ef 00 ff the same for 100000 .. 700000 g 800000 00 e3 00 b3 thesis: a: ?0?0 0000 ? ? only in monitor mode set x: xxxx address bits a19 .. a16 for memory accesses with a15 0 ? 0000 c64 mode 0001 dosmode 1110 c65 mode, plain ram access (0000-1fff contains the switching code, so not switchable!?) 1000 monitor 1 map 6000-7fff 1 map 4000-5fff 1 map 2000-3fff 1 map 0000-1fff y: ?000 0000 ? only in dos mode set z: xxxx address bits a19 .. a16 for memory accesses with a15 1 ? 0000 c64 mode 0011 dosmode 1000 monitor 1011 c65 mode 1111 plain ram access 1 map e000-ffff 1 map c000-dfff 1 map a000-bfff 1 map 8000-9fff */ #include "emu.h" #include "debugger.h" #include "m6502.h" #include "m4510.h" #include "minc4510.h" #include "opsce02.h" #include "ops4510.h" #define M6502_NMI_VEC 0xfffa #define M6502_RST_VEC 0xfffc #define M6502_IRQ_VEC 0xfffe #define M4510_RST_VEC M6502_RST_VEC #define M4510_IRQ_VEC M6502_IRQ_VEC #define M4510_NMI_VEC M6502_NMI_VEC #define VERBOSE 0 #define LOG(x) do { if (VERBOSE) logerror x; } while (0) typedef struct _m4510_Regs m4510_Regs; struct _m4510_Regs { void (*const *insn)(m4510_Regs *); /* pointer to the function pointer table */ PAIR ppc; /* previous program counter */ PAIR pc; /* program counter */ PAIR sp; /* stack pointer (always 100 - 1FF) */ PAIR zp; /* zero page address */ /* contains B register zp.b.h */ PAIR ea; /* effective address */ UINT8 a; /* Accumulator */ UINT8 x; /* X index register */ UINT8 y; /* Y index register */ UINT8 z; /* Z index register */ UINT8 p; /* Processor status */ UINT8 interrupt_inhibit; /* Some instructions, like MAP, inhibit interrupt */ UINT8 pending_irq; /* nonzero if an IRQ is pending */ UINT8 after_cli; /* pending IRQ and last insn cleared I */ UINT8 nmi_state; UINT8 irq_state; UINT16 low, high; UINT32 mem[8]; device_irq_callback irq_callback; legacy_cpu_device *device; address_space *space; direct_read_data *direct; int icount; read8_space_func rdmem_id; /* readmem callback for indexed instructions */ write8_space_func wrmem_id; /* writemem callback for indexed instructions */ UINT8 ddr; UINT8 port; m6510_port_read_func port_read; m6510_port_write_func port_write; }; INLINE m4510_Regs *get_safe_token(running_device *device) { assert(device != NULL); assert(device->type() == M4510); return (m4510_Regs *)downcast(device)->token(); } /*************************************************************** * include the opcode macros, functions and tables ***************************************************************/ INLINE int m4510_cpu_readop(m4510_Regs *cpustate) { register UINT16 t=cpustate->pc.w.l++; return cpustate->direct->read_decrypted_byte(M4510_MEM(t)); } INLINE int m4510_cpu_readop_arg(m4510_Regs *cpustate) { register UINT16 t=cpustate->pc.w.l++; return cpustate->direct->read_raw_byte(M4510_MEM(t)); } #define M4510 #include "t65ce02.c" static UINT8 default_rdmem_id(address_space *space, offs_t address) { m4510_Regs *cpustate = get_safe_token(space->cpu); return space->read_byte(M4510_MEM(address)); } static void default_wrmem_id(address_space *space, offs_t address, UINT8 data) { m4510_Regs *cpustate = get_safe_token(space->cpu); space->write_byte(M4510_MEM(address), data); } static CPU_INIT( m4510 ) { m4510_Regs *cpustate = get_safe_token(device); const m6502_interface *intf = (const m6502_interface *)device->baseconfig().static_config(); cpustate->interrupt_inhibit = 0; cpustate->rdmem_id = default_rdmem_id; cpustate->wrmem_id = default_wrmem_id; cpustate->port_read = NULL; cpustate->port_write = NULL; cpustate->irq_callback = irqcallback; cpustate->device = device; cpustate->space = device->space(AS_PROGRAM); cpustate->direct = &cpustate->space->direct(); if ( intf ) { if ( intf->read_indexed_func ) cpustate->rdmem_id = intf->read_indexed_func; if ( intf->write_indexed_func ) cpustate->wrmem_id = intf->write_indexed_func; if ( intf->port_read_func ) cpustate->port_read = intf->port_read_func; if ( intf->port_write_func ) cpustate->port_write = intf->port_write_func; } } static CPU_RESET( m4510 ) { m4510_Regs *cpustate = get_safe_token(device); cpustate->insn = insn4510; /* wipe out the rest of the m65ce02 structure */ /* read the reset vector into PC */ /* reset z index and b bank */ PCL = RDMEM(M4510_RST_VEC); PCH = RDMEM(M4510_RST_VEC+1); /* after reset in 6502 compatibility mode */ cpustate->sp.d = 0x01ff; /* high byte descriped in databook */ cpustate->z = 0; B = 0; cpustate->p = F_E|F_B|F_I|F_Z; /* set E, I and Z flags */ cpustate->interrupt_inhibit = 0; cpustate->pending_irq = 0; /* nonzero if an IRQ is pending */ cpustate->after_cli = 0; /* pending IRQ and last insn cleared I */ cpustate->irq_callback = NULL; /* don't know */ cpustate->high=0x8200; cpustate->mem[7]=0x20000; cpustate->port = 0xff; cpustate->ddr = 0x00; } static CPU_EXIT( m4510 ) { /* nothing to do yet */ } INLINE void m4510_take_irq(m4510_Regs *cpustate) { if(( !(P & F_I) ) && (cpustate->interrupt_inhibit == 0)) { EAD = M4510_IRQ_VEC; cpustate->icount -= 7; PUSH(PCH); PUSH(PCL); PUSH(P & ~F_B); P = (P & ~F_D) | F_I; /* knock out D and set I flag */ PCL = RDMEM(EAD); PCH = RDMEM(EAD+1); LOG(("M4510 '%s' takes IRQ ($%04x)\n", cpustate->device->tag(), PCD)); /* call back the cpuintrf to let it clear the line */ if (cpustate->irq_callback) (*cpustate->irq_callback)(cpustate->device, 0); } cpustate->pending_irq = 0; } static CPU_EXECUTE( m4510 ) { m4510_Regs *cpustate = get_safe_token(device); do { UINT8 op; PPC = PCD; debugger_instruction_hook(device, PCD); /* if an irq is pending, take it now */ if( cpustate->pending_irq ) m4510_take_irq(cpustate); op = RDOP(); (*insn4510[op])(cpustate); /* check if the I flag was just reset (interrupts enabled) */ if( cpustate->after_cli ) { LOG(("M4510 '%s' after_cli was >0", cpustate->device->tag())); cpustate->after_cli = 0; if (cpustate->irq_state != CLEAR_LINE) { LOG((": irq line is asserted: set pending IRQ\n")); cpustate->pending_irq = 1; } else { LOG((": irq line is clear\n")); } } else if( cpustate->pending_irq ) m4510_take_irq(cpustate); } while (cpustate->icount > 0); } static void m4510_set_irq_line(m4510_Regs *cpustate, int irqline, int state) { if (irqline == INPUT_LINE_NMI) { if (cpustate->nmi_state == state) return; cpustate->nmi_state = state; if( state != CLEAR_LINE ) { LOG(("M4510 '%s' set_nmi_line(ASSERT)\n", cpustate->device->tag())); EAD = M4510_NMI_VEC; cpustate->icount -= 7; PUSH(PCH); PUSH(PCL); PUSH(P & ~F_B); P = (P & ~F_D) | F_I; /* knock out D and set I flag */ PCL = RDMEM(EAD); PCH = RDMEM(EAD+1); LOG(("M4510 '%s' takes NMI ($%04x)\n", cpustate->device->tag(), PCD)); } } else { cpustate->irq_state = state; if( state != CLEAR_LINE ) { LOG(("M4510 '%s' set_irq_line(ASSERT)\n", cpustate->device->tag())); cpustate->pending_irq = 1; } } } UINT8 m4510_get_port(legacy_cpu_device *device) { m4510_Regs *cpustate = get_safe_token(device); return (cpustate->port & cpustate->ddr) | (cpustate->ddr ^ 0xff); } static READ8_HANDLER( m4510_read_0000 ) { UINT8 result = 0x00; m4510_Regs *cpustate = get_safe_token(space->cpu); switch(offset) { case 0x0000: /* DDR */ result = cpustate->ddr; break; case 0x0001: /* Data Port */ if (cpustate->port_read) result = cpustate->port_read(cpustate->device, 0); result = (cpustate->ddr & cpustate->port) | (~cpustate->ddr & result); break; } return result; } static WRITE8_HANDLER( m4510_write_0000 ) { m4510_Regs *cpustate = get_safe_token(space->cpu); switch(offset) { case 0x0000: /* DDR */ cpustate->ddr = data; break; case 0x0001: /* Data Port */ cpustate->port = data; break; } if (cpustate->port_write) cpustate->port_write(cpustate->device, 0, m4510_get_port(downcast(space->cpu))); } static ADDRESS_MAP_START(m4510_mem, ADDRESS_SPACE_PROGRAM, 8) AM_RANGE(0x0000, 0x0001) AM_READWRITE(m4510_read_0000, m4510_write_0000) ADDRESS_MAP_END static CPU_TRANSLATE( m4510 ) { m4510_Regs *cpustate = get_safe_token(device); if (space == ADDRESS_SPACE_PROGRAM) *address = M4510_MEM(*address); return TRUE; } /************************************************************************** * Generic set_info **************************************************************************/ static CPU_SET_INFO( m4510 ) { m4510_Regs *cpustate = get_safe_token(device); switch (state) { /* --- the following bits of info are set as 64-bit signed integers --- */ case CPUINFO_INT_INPUT_STATE + M4510_IRQ_LINE: m4510_set_irq_line(cpustate, M4510_IRQ_LINE, info->i); break; case CPUINFO_INT_INPUT_STATE + INPUT_LINE_NMI: m4510_set_irq_line(cpustate, INPUT_LINE_NMI, info->i); break; case CPUINFO_INT_PC: PCW = info->i; break; case CPUINFO_INT_REGISTER + M4510_PC: cpustate->pc.w.l = info->i; break; case CPUINFO_INT_SP: SPL = info->i; break; case CPUINFO_INT_REGISTER + M4510_S: cpustate->sp.b.l = info->i; break; case CPUINFO_INT_REGISTER + M4510_P: cpustate->p = info->i; break; case CPUINFO_INT_REGISTER + M4510_A: cpustate->a = info->i; break; case CPUINFO_INT_REGISTER + M4510_X: cpustate->x = info->i; break; case CPUINFO_INT_REGISTER + M4510_Y: cpustate->y = info->i; break; case CPUINFO_INT_REGISTER + M4510_Z: cpustate->z = info->i; break; case CPUINFO_INT_REGISTER + M4510_B: cpustate->zp.b.h = info->i; break; case CPUINFO_INT_REGISTER + M4510_MEM_LOW: cpustate->low = info->i; break; case CPUINFO_INT_REGISTER + M4510_MEM_HIGH: cpustate->high = info->i; break; case CPUINFO_INT_REGISTER + M4510_EA: cpustate->ea.w.l = info->i; break; case CPUINFO_INT_REGISTER + M4510_ZP: cpustate->zp.w.l = info->i; break; case CPUINFO_INT_REGISTER + M4510_MEM0: cpustate->mem[0] = info->i; break; case CPUINFO_INT_REGISTER + M4510_MEM1: cpustate->mem[1] = info->i; break; case CPUINFO_INT_REGISTER + M4510_MEM2: cpustate->mem[2] = info->i; break; case CPUINFO_INT_REGISTER + M4510_MEM3: cpustate->mem[3] = info->i; break; case CPUINFO_INT_REGISTER + M4510_MEM4: cpustate->mem[4] = info->i; break; case CPUINFO_INT_REGISTER + M4510_MEM5: cpustate->mem[5] = info->i; break; case CPUINFO_INT_REGISTER + M4510_MEM6: cpustate->mem[6] = info->i; break; case CPUINFO_INT_REGISTER + M4510_MEM7: cpustate->mem[7] = info->i; break; } } /************************************************************************** * Generic get_info **************************************************************************/ CPU_GET_INFO( m4510 ) { m4510_Regs *cpustate = (device != NULL && device->token() != NULL) ? get_safe_token(device) : NULL; switch (state) { /* --- the following bits of info are returned as 64-bit signed integers --- */ case CPUINFO_INT_CONTEXT_SIZE: info->i = sizeof(m4510_Regs); break; case CPUINFO_INT_INPUT_LINES: info->i = 2; break; case CPUINFO_INT_DEFAULT_IRQ_VECTOR: info->i = 0; break; case DEVINFO_INT_ENDIANNESS: info->i = ENDIANNESS_LITTLE; break; case CPUINFO_INT_CLOCK_MULTIPLIER: info->i = 1; break; case CPUINFO_INT_CLOCK_DIVIDER: info->i = 1; break; case CPUINFO_INT_MIN_INSTRUCTION_BYTES: info->i = 1; break; case CPUINFO_INT_MAX_INSTRUCTION_BYTES: info->i = 3; break; case CPUINFO_INT_MIN_CYCLES: info->i = 1; break; case CPUINFO_INT_MAX_CYCLES: info->i = 10; break; case DEVINFO_INT_DATABUS_WIDTH + ADDRESS_SPACE_PROGRAM: info->i = 8; break; case DEVINFO_INT_ADDRBUS_WIDTH + ADDRESS_SPACE_PROGRAM: info->i = 20; break; case DEVINFO_INT_ADDRBUS_SHIFT + ADDRESS_SPACE_PROGRAM: info->i = 0; break; case CPUINFO_INT_LOGADDR_WIDTH_PROGRAM: info->i = 16; break; case CPUINFO_INT_PAGE_SHIFT_PROGRAM: info->i = 13; break; case DEVINFO_INT_DATABUS_WIDTH + ADDRESS_SPACE_DATA: info->i = 0; break; case DEVINFO_INT_ADDRBUS_WIDTH + ADDRESS_SPACE_DATA: info->i = 0; break; case DEVINFO_INT_ADDRBUS_SHIFT + ADDRESS_SPACE_DATA: info->i = 0; break; case DEVINFO_INT_DATABUS_WIDTH + ADDRESS_SPACE_IO: info->i = 0; break; case DEVINFO_INT_ADDRBUS_WIDTH + ADDRESS_SPACE_IO: info->i = 0; break; case DEVINFO_INT_ADDRBUS_SHIFT + ADDRESS_SPACE_IO: info->i = 0; break; case CPUINFO_INT_INPUT_STATE + M4510_IRQ_LINE: info->i = cpustate->irq_state; break; case CPUINFO_INT_INPUT_STATE + INPUT_LINE_NMI: info->i = cpustate->nmi_state; break; case CPUINFO_INT_PREVIOUSPC: info->i = cpustate->ppc.w.l; break; case CPUINFO_INT_PC: info->i = PCD; break; case CPUINFO_INT_REGISTER + M4510_PC: info->i = cpustate->pc.w.l; break; case CPUINFO_INT_SP: info->i = SPL; break; case CPUINFO_INT_REGISTER + M4510_S: info->i = cpustate->sp.b.l; break; case CPUINFO_INT_REGISTER + M4510_P: info->i = cpustate->p; break; case CPUINFO_INT_REGISTER + M4510_A: info->i = cpustate->a; break; case CPUINFO_INT_REGISTER + M4510_X: info->i = cpustate->x; break; case CPUINFO_INT_REGISTER + M4510_Y: info->i = cpustate->y; break; case CPUINFO_INT_REGISTER + M4510_Z: info->i = cpustate->z; break; case CPUINFO_INT_REGISTER + M4510_B: info->i = cpustate->zp.b.h; break; case CPUINFO_INT_REGISTER + M4510_MEM_LOW: info->i = cpustate->low; break; case CPUINFO_INT_REGISTER + M4510_MEM_HIGH: info->i = cpustate->high; break; case CPUINFO_INT_REGISTER + M4510_EA: info->i = cpustate->ea.w.l; break; case CPUINFO_INT_REGISTER + M4510_ZP: info->i = cpustate->zp.w.l; break; case CPUINFO_INT_REGISTER + M4510_MEM0: info->i = cpustate->mem[0]; break; case CPUINFO_INT_REGISTER + M4510_MEM1: info->i = cpustate->mem[1]; break; case CPUINFO_INT_REGISTER + M4510_MEM2: info->i = cpustate->mem[2]; break; case CPUINFO_INT_REGISTER + M4510_MEM3: info->i = cpustate->mem[3]; break; case CPUINFO_INT_REGISTER + M4510_MEM4: info->i = cpustate->mem[4]; break; case CPUINFO_INT_REGISTER + M4510_MEM5: info->i = cpustate->mem[5]; break; case CPUINFO_INT_REGISTER + M4510_MEM6: info->i = cpustate->mem[6]; break; case CPUINFO_INT_REGISTER + M4510_MEM7: info->i = cpustate->mem[7]; break; /* --- the following bits of info are returned as pointers to data or functions --- */ case CPUINFO_FCT_SET_INFO: info->setinfo = CPU_SET_INFO_NAME(m4510); break; case CPUINFO_FCT_INIT: info->init = CPU_INIT_NAME(m4510); break; case CPUINFO_FCT_RESET: info->reset = CPU_RESET_NAME(m4510); break; case CPUINFO_FCT_EXIT: info->exit = CPU_EXIT_NAME(m4510); break; case CPUINFO_FCT_EXECUTE: info->execute = CPU_EXECUTE_NAME(m4510); break; case CPUINFO_FCT_BURN: info->burn = NULL; break; case CPUINFO_FCT_DISASSEMBLE: info->disassemble = CPU_DISASSEMBLE_NAME(m4510); break; case CPUINFO_PTR_INSTRUCTION_COUNTER: info->icount = &cpustate->icount; break; case DEVINFO_PTR_INTERNAL_MEMORY_MAP + ADDRESS_SPACE_PROGRAM: info->internal_map8 = ADDRESS_MAP_NAME(m4510_mem); break; case CPUINFO_FCT_TRANSLATE: info->translate = CPU_TRANSLATE_NAME(m4510); break; /* --- the following bits of info are returned as NULL-terminated strings --- */ case DEVINFO_STR_NAME: strcpy(info->s, "M4510"); break; case DEVINFO_STR_FAMILY: strcpy(info->s, "CBM Semiconductor Group CSG 65CE02"); break; case DEVINFO_STR_VERSION: strcpy(info->s, "1.0beta"); break; case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break; case DEVINFO_STR_CREDITS: strcpy(info->s, "Copyright Juergen Buchmueller\nCopyright Peter Trauner\nall rights reserved."); break; case CPUINFO_STR_FLAGS: sprintf(info->s, "%c%c%c%c%c%c%c%c", cpustate->p & 0x80 ? 'N':'.', cpustate->p & 0x40 ? 'V':'.', cpustate->p & 0x20 ? 'R':'.', cpustate->p & 0x10 ? 'B':'.', cpustate->p & 0x08 ? 'D':'.', cpustate->p & 0x04 ? 'I':'.', cpustate->p & 0x02 ? 'Z':'.', cpustate->p & 0x01 ? 'C':'.'); break; case CPUINFO_STR_REGISTER + M4510_PC: sprintf(info->s, "PC:%04X", cpustate->pc.w.l); break; case CPUINFO_STR_REGISTER + M4510_S: sprintf(info->s, "S:%02X", cpustate->sp.b.l); break; case CPUINFO_STR_REGISTER + M4510_P: sprintf(info->s, "P:%02X", cpustate->p); break; case CPUINFO_STR_REGISTER + M4510_A: sprintf(info->s, "A:%02X", cpustate->a); break; case CPUINFO_STR_REGISTER + M4510_X: sprintf(info->s, "X:%02X", cpustate->x); break; case CPUINFO_STR_REGISTER + M4510_Y: sprintf(info->s, "Y:%02X", cpustate->y); break; case CPUINFO_STR_REGISTER + M4510_Z: sprintf(info->s, "Z:%02X", cpustate->z); break; case CPUINFO_STR_REGISTER + M4510_B: sprintf(info->s, "B:%02X", cpustate->zp.b.h); break; case CPUINFO_STR_REGISTER + M4510_MEM_LOW: sprintf(info->s, "M0:%01X", cpustate->low); break; case CPUINFO_STR_REGISTER + M4510_MEM_HIGH: sprintf(info->s, "M1:%01X", cpustate->high); break; case CPUINFO_STR_REGISTER + M4510_EA: sprintf(info->s, "EA:%04X", cpustate->ea.w.l); break; case CPUINFO_STR_REGISTER + M4510_ZP: sprintf(info->s, "ZP:%03X", cpustate->zp.w.l); break; } } #undef M4510 DEFINE_LEGACY_CPU_DEVICE(M4510, m4510);