3b1emu: src/memory.c@7d14fab5e4aa (annotated)

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src/memory.c@7d14fab5e4aa (annotated)

src/memory.c

Fri, 03 Dec 2010 01:43:57 +0000

author: Philip Pemberton <philpem@philpem.me.uk>
date: Fri, 03 Dec 2010 01:43:57 +0000
changeset 46: 7d14fab5e4aa
parent 44: f928be115194
child 52: a350dfa92895
permissions: -rw-r--r--

add comments for some write-only regs, fix LOG_NOT_HANDLED_R(32) in read16, basic LED reg decoding

 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
 #include <stdbool.h>
 #include "musashi/m68k.h"
 #include "state.h"
 #include "memory.h"
 /******************
  * Memory mapping
  ******************/
 #define MAPRAM(addr) (((uint16_t)state.map[addr*2] << 8) + ((uint16_t)state.map[(addr*2)+1]))
 uint32_t mapAddr(uint32_t addr, bool writing)
 {
 	if (addr < 0x400000) {
 		// RAM access. Check against the Map RAM
 		// Start by getting the original page address
 		uint16_t page = (addr >> 12) & 0x3FF;
 		// Look it up in the map RAM and get the physical page address
 		uint32_t new_page_addr = MAPRAM(page) & 0x3FF;
 		// Update the Page Status bits
 		uint8_t pagebits = (MAPRAM(page) >> 13) & 0x03;
 		if (pagebits != 0) {
 			if (writing)
 				state.map[page*2] |= 0x60;		// Page written to (dirty)
 			else
 				state.map[page*2] |= 0x40;		// Page accessed but not written
 		}
 		// Return the address with the new physical page spliced in
 		return (new_page_addr << 12) + (addr & 0xFFF);
 	} else {
 		// I/O, VRAM or MapRAM space; no mapping is performed or required
 		// TODO: assert here?
 		return addr;
 	}
 }
 MEM_STATUS checkMemoryAccess(uint32_t addr, bool writing)
 {
 	// Are we in Supervisor mode?
 	if (m68k_get_reg(NULL, M68K_REG_SR) & 0x2000)
 		// Yes. We can do anything we like.
 		return MEM_ALLOWED;
 	// If we're here, then we must be in User mode.
 	// Check that the user didn't access memory outside of the RAM area
 	if (addr >= 0x400000)
 		return MEM_UIE;
 	// This leaves us with Page Fault checking. Get the page bits for this page.
 	uint16_t page = (addr >> 12) & 0x3FF;
 	uint8_t pagebits = (MAPRAM(page) >> 13) & 0x07;
 	// Check page is present
 	if ((pagebits & 0x03) == 0)
 		return MEM_PAGEFAULT;
 	// User attempt to access the kernel
 	// A19, A20, A21, A22 low (kernel access): RAM addr before paging; not in Supervisor mode
 	if (((addr >> 19) & 0x0F) == 0)
 		return MEM_KERNEL;
 	// Check page is write enabled
 	if ((pagebits & 0x04) == 0)
 		return MEM_PAGE_NO_WE;
 	// Page access allowed.
 	return MEM_ALLOWED;
 }
 #undef MAPRAM
 /********************************************************
  * m68k memory read/write support functions for Musashi
  ********************************************************/
 /**
  * @brief	Check memory access permissions for a write operation.
  * @note	This used to be a single macro (merged with ACCESS_CHECK_RD), but
  * 			gcc throws warnings when you have a return-with-value in a void
  * 			function, even if the return-with-value is completely unreachable.
  * 			Similarly it doesn't like it if you have a return without a value
  * 			in a non-void function, even if it's impossible to ever reach the
  * 			return-with-no-value. UGH!
  */
 #define ACCESS_CHECK_WR(address, bits) do {							\
 		bool fault = false;											\
 		/* MEM_STATUS st; */										\
 		switch (checkMemoryAccess(address, true)) {					\
 			case MEM_ALLOWED:										\
 				/* Access allowed */								\
 				break;												\
 			case MEM_PAGEFAULT:										\
 				/* Page fault */									\
 				state.genstat = 0x8BFF | (state.pie ? 0x0400 : 0);	\
 				fault = true;										\
 				break;												\
 			case MEM_UIE:											\
 				/* User access to memory above 4MB */				\
 				state.genstat = 0x9AFF | (state.pie ? 0x0400 : 0);	\
 				fault = true;										\
 				break;												\
 			case MEM_KERNEL:										\
 			case MEM_PAGE_NO_WE:									\
 				/* kernel access or page not write enabled */		\
 				/* TODO: which regs need setting? */				\
 				fault = true;										\
 				break;												\
 		}															\
 																	\
 		if (fault) {												\
 			if (bits >= 16)											\
 				state.bsr0 = 0x7F00;								\
 			else													\
 				state.bsr0 = (address & 1) ? 0x7D00 : 0x7E00;		\
 			state.bsr0 |= (address >> 16);							\
 			state.bsr1 = address & 0xffff;							\
 			printf("ERR: BusError WR\n");							\
 			m68k_pulse_bus_error();									\
 			return;													\
 		}															\
 	} while (false)
 /**
  * @brief Check memory access permissions for a read operation.
  * @note	This used to be a single macro (merged with ACCESS_CHECK_WR), but
  * 			gcc throws warnings when you have a return-with-value in a void
  * 			function, even if the return-with-value is completely unreachable.
  * 			Similarly it doesn't like it if you have a return without a value
  * 			in a non-void function, even if it's impossible to ever reach the
  * 			return-with-no-value. UGH!
  */
 #define ACCESS_CHECK_RD(address, bits) do {							\
 		bool fault = false;											\
 		/* MEM_STATUS st; */										\
 		switch (checkMemoryAccess(address, false)) {				\
 			case MEM_ALLOWED:										\
 				/* Access allowed */								\
 				break;												\
 			case MEM_PAGEFAULT:										\
 				/* Page fault */									\
 				state.genstat = 0xCBFF | (state.pie ? 0x0400 : 0);	\
 				fault = true;										\
 				break;												\
 			case MEM_UIE:											\
 				/* User access to memory above 4MB */				\
 				state.genstat = 0xDAFF | (state.pie ? 0x0400 : 0);	\
 				fault = true;										\
 				break;												\
 			case MEM_KERNEL:										\
 			case MEM_PAGE_NO_WE:									\
 				/* kernel access or page not write enabled */		\
 				/* TODO: which regs need setting? */				\
 				fault = true;										\
 				break;												\
 		}															\
 																	\
 		if (fault) {												\
 			if (bits >= 16)											\
 				state.bsr0 = 0x7F00;								\
 			else													\
 				state.bsr0 = (address & 1) ? 0x7D00 : 0x7E00;		\
 			state.bsr0 |= (address >> 16);							\
 			state.bsr1 = address & 0xffff;							\
 			printf("ERR: BusError RD\n");							\
 			m68k_pulse_bus_error();									\
 			return 0xFFFFFFFF;										\
 		}															\
 	} while (false)
 // Logging macros
 #define LOG_NOT_HANDLED_R(bits)																	\
 	do {																						\
 		if (!handled)																			\
 			printf("unhandled read%02d, addr=0x%08X\n", bits, address);							\
 	} while (0);
 #define LOG_NOT_HANDLED_W(bits)																	\
 	do {																						\
 		if (!handled)																			\
 			printf("unhandled write%02d, addr=0x%08X, data=0x%08X\n", bits, address, value);	\
 	} while (0);
 /**
  * @brief Read M68K memory, 32-bit
  */
 uint32_t m68k_read_memory_32(uint32_t address)
 {
 	uint32_t data = 0xFFFFFFFF;
 	bool handled = false;
 	// If ROMLMAP is set, force system to access ROM
 	if (!state.romlmap)
 		address |= 0x800000;
 	// Check access permissions
 	ACCESS_CHECK_RD(address, 32);
 	if ((address >= 0x800000) && (address <= 0xBFFFFF)) {
 		// ROM access
 		data = RD32(state.rom, address, ROM_SIZE - 1);
 		handled = true;
 	} else if (address <= (state.ram_size - 1)) {
 		// RAM access
 		data = RD32(state.ram, mapAddr(address, false), state.ram_size - 1);
 		handled = true;
 	} else if ((address >= 0x400000) && (address <= 0x7FFFFF)) {
 		// I/O register space, zone A
 		switch (address & 0x0F0000) {
 			case 0x000000:				// Map RAM access
 				if (address > 0x4007FF) fprintf(stderr, "NOTE: RD32 from MapRAM mirror, addr=0x%08X\n", address);
 				data = RD32(state.map, address, 0x7FF);
 				handled = true;
 				break;
 			case 0x010000:				// General Status Register
 				data = ((uint32_t)state.genstat << 16) + (uint32_t)state.genstat;
 				handled = true;
 				break;
 			case 0x020000:				// Video RAM
 				if (address > 0x427FFF) fprintf(stderr, "NOTE: RD32 from VideoRAM mirror, addr=0x%08X\n", address);
 				data = RD32(state.vram, address, 0x7FFF);
 				handled = true;
 				break;
 			case 0x030000:				// Bus Status Register 0
 				data = ((uint32_t)state.bsr0 << 16) + (uint32_t)state.bsr0;
 				handled = true;
 				break;
 			case 0x040000:				// Bus Status Register 1
 				data = ((uint32_t)state.bsr1 << 16) + (uint32_t)state.bsr1;
 				handled = true;
 				break;
 			case 0x050000:				// Phone status
 				break;
 			case 0x060000:				// DMA Count
 				break;
 			case 0x070000:				// Line Printer Status Register
 				break;
 			case 0x080000:				// Real Time Clock
 				break;
 			case 0x090000:				// Phone registers
 				switch (address & 0x0FF000) {
 					case 0x090000:		// Handset relay
 					case 0x098000:
 						break;
 					case 0x091000:		// Line select 2
 					case 0x099000:
 						break;
 					case 0x092000:		// Hook relay 1
 					case 0x09A000:
 						break;
 					case 0x093000:		// Hook relay 2
 					case 0x09B000:
 						break;
 					case 0x094000:		// Line 1 hold
 					case 0x09C000:
 						break;
 					case 0x095000:		// Line 2 hold
 					case 0x09D000:
 						break;
 					case 0x096000:		// Line 1 A-lead
 					case 0x09E000:
 						break;
 					case 0x097000:		// Line 2 A-lead
 					case 0x09F000:
 						break;
 				}
 				break;
 			case 0x0A0000:				// Miscellaneous Control Register -- write only!
 				handled = true;
 				break;
 			case 0x0B0000:				// TM/DIALWR
 				break;
 			case 0x0C0000:				// Clear Status Register -- write only!
 				handled = true;
 				break;
 			case 0x0D0000:				// DMA Address Register
 				break;
 			case 0x0E0000:				// Disk Control Register
 				break;
 			case 0x0F0000:				// Line Printer Data Register
 				break;
 		}
 	} else if ((address >= 0xC00000) && (address <= 0xFFFFFF)) {
 		// I/O register space, zone B
 		switch (address & 0xF00000) {
 			case 0xC00000:				// Expansion slots
 			case 0xD00000:
 				switch (address & 0xFC0000) {
 					case 0xC00000:		// Expansion slot 0
 					case 0xC40000:		// Expansion slot 1
 					case 0xC80000:		// Expansion slot 2
 					case 0xCC0000:		// Expansion slot 3
 					case 0xD00000:		// Expansion slot 4
 					case 0xD40000:		// Expansion slot 5
 					case 0xD80000:		// Expansion slot 6
 					case 0xDC0000:		// Expansion slot 7
 						fprintf(stderr, "NOTE: RD32 from expansion card space, addr=0x%08X\n", address);
 						break;
 				}
 				break;
 			case 0xE00000:				// HDC, FDC, MCR2 and RTC data bits
 			case 0xF00000:
 				switch (address & 0x070000) {
 					case 0x000000:		// [ef][08]xxxx ==> WD1010 hard disc controller
 						break;
 					case 0x010000:		// [ef][19]xxxx ==> WD2797 floppy disc controller
 						break;
 					case 0x020000:		// [ef][2a]xxxx ==> Miscellaneous Control Register 2
 						break;
 					case 0x030000:		// [ef][3b]xxxx ==> Real Time Clock data bits
 						break;
 					case 0x040000:		// [ef][4c]xxxx ==> General Control Register
 						switch (address & 0x077000) {
 							case 0x040000:		// [ef][4c][08]xxx ==> EE
 							case 0x041000:		// [ef][4c][19]xxx ==> PIE
 							case 0x042000:		// [ef][4c][2A]xxx ==> BP
 							case 0x043000:		// [ef][4c][3B]xxx ==> ROMLMAP
 							case 0x044000:		// [ef][4c][4C]xxx ==> L1 MODEM
 							case 0x045000:		// [ef][4c][5D]xxx ==> L2 MODEM
 							case 0x046000:		// [ef][4c][6E]xxx ==> D/N CONNECT
 								// All write-only registers... TODO: bus error?
 								handled = true;
 								break;
 							case 0x047000:		// [ef][4c][7F]xxx ==> Whole screen reverse video [FIXME: not in TRM]
 								break;
 						}
 						break;
 					case 0x050000:		// [ef][5d]xxxx ==> 8274
 						break;
 					case 0x060000:		// [ef][6e]xxxx ==> Control regs
 						switch (address & 0x07F000) {
 							default:
 								break;
 						}
 						break;
 					case 0x070000:		// [ef][7f]xxxx ==> 6850 Keyboard Controller
 						break;
 				}
 		}
 	}
 	LOG_NOT_HANDLED_R(32);
 	return data;
 }
 /**
  * @brief Read M68K memory, 16-bit
  */
 uint32_t m68k_read_memory_16(uint32_t address)
 {
 	uint16_t data = 0xFFFF;
 	bool handled = false;
 	// If ROMLMAP is set, force system to access ROM
 	if (!state.romlmap)
 		address |= 0x800000;
 	// Check access permissions
 	ACCESS_CHECK_RD(address, 16);
 	if ((address >= 0x800000) && (address <= 0xBFFFFF)) {
 		// ROM access
 		data = RD16(state.rom, address, ROM_SIZE - 1);
 		handled = true;
 	} else if (address <= (state.ram_size - 1)) {
 		// RAM access
 		data = RD16(state.ram, mapAddr(address, false), state.ram_size - 1);
 		handled = true;
 	} else if ((address >= 0x400000) && (address <= 0x7FFFFF)) {
 		// I/O register space, zone A
 		switch (address & 0x0F0000) {
 			case 0x000000:				// Map RAM access
 				if (address > 0x4007FF) fprintf(stderr, "NOTE: RD16 from MapRAM mirror, addr=0x%08X\n", address);
 				data = RD16(state.map, address, 0x7FF);
 				handled = true;
 				break;
 			case 0x010000:				// General Status Register
 				data = state.genstat;
 				handled = true;
 				break;
 			case 0x020000:				// Video RAM
 				if (address > 0x427FFF) fprintf(stderr, "NOTE: RD16 from VideoRAM mirror, addr=0x%08X\n", address);
 				data = RD16(state.vram, address, 0x7FFF);
 				handled = true;
 				break;
 			case 0x030000:				// Bus Status Register 0
 				data = state.bsr0;
 				handled = true;
 				break;
 			case 0x040000:				// Bus Status Register 1
 				data = state.bsr1;
 				handled = true;
 				break;
 			case 0x050000:				// Phone status
 				break;
 			case 0x060000:				// DMA Count
 				break;
 			case 0x070000:				// Line Printer Status Register
 				break;
 			case 0x080000:				// Real Time Clock
 				break;
 			case 0x090000:				// Phone registers
 				switch (address & 0x0FF000) {
 					case 0x090000:		// Handset relay
 					case 0x098000:
 						break;
 					case 0x091000:		// Line select 2
 					case 0x099000:
 						break;
 					case 0x092000:		// Hook relay 1
 					case 0x09A000:
 						break;
 					case 0x093000:		// Hook relay 2
 					case 0x09B000:
 						break;
 					case 0x094000:		// Line 1 hold
 					case 0x09C000:
 						break;
 					case 0x095000:		// Line 2 hold
 					case 0x09D000:
 						break;
 					case 0x096000:		// Line 1 A-lead
 					case 0x09E000:
 						break;
 					case 0x097000:		// Line 2 A-lead
 					case 0x09F000:
 						break;
 				}
 				break;
 			case 0x0A0000:				// Miscellaneous Control Register -- write only!
 				handled = true;
 				break;
 			case 0x0B0000:				// TM/DIALWR
 				break;
 			case 0x0C0000:				// Clear Status Register -- write only!
 				handled = true;
 				break;
 			case 0x0D0000:				// DMA Address Register
 				break;
 			case 0x0E0000:				// Disk Control Register
 				break;
 			case 0x0F0000:				// Line Printer Data Register
 				break;
 		}
 	} else if ((address >= 0xC00000) && (address <= 0xFFFFFF)) {
 		// I/O register space, zone B
 		switch (address & 0xF00000) {
 			case 0xC00000:				// Expansion slots
 			case 0xD00000:
 				switch (address & 0xFC0000) {
 					case 0xC00000:		// Expansion slot 0
 					case 0xC40000:		// Expansion slot 1
 					case 0xC80000:		// Expansion slot 2
 					case 0xCC0000:		// Expansion slot 3
 					case 0xD00000:		// Expansion slot 4
 					case 0xD40000:		// Expansion slot 5
 					case 0xD80000:		// Expansion slot 6
 					case 0xDC0000:		// Expansion slot 7
 						fprintf(stderr, "NOTE: RD16 from expansion card space, addr=0x%08X\n", address);
 						break;
 				}
 				break;
 			case 0xE00000:				// HDC, FDC, MCR2 and RTC data bits
 			case 0xF00000:
 				switch (address & 0x070000) {
 					case 0x000000:		// [ef][08]xxxx ==> WD1010 hard disc controller
 						break;
 					case 0x010000:		// [ef][19]xxxx ==> WD2797 floppy disc controller
 						break;
 					case 0x020000:		// [ef][2a]xxxx ==> Miscellaneous Control Register 2
 						break;
 					case 0x030000:		// [ef][3b]xxxx ==> Real Time Clock data bits
 						break;
 					case 0x040000:		// [ef][4c]xxxx ==> General Control Register
 						switch (address & 0x077000) {
 							case 0x040000:		// [ef][4c][08]xxx ==> EE
 							case 0x041000:		// [ef][4c][19]xxx ==> PIE
 							case 0x042000:		// [ef][4c][2A]xxx ==> BP
 							case 0x043000:		// [ef][4c][3B]xxx ==> ROMLMAP
 							case 0x044000:		// [ef][4c][4C]xxx ==> L1 MODEM
 							case 0x045000:		// [ef][4c][5D]xxx ==> L2 MODEM
 							case 0x046000:		// [ef][4c][6E]xxx ==> D/N CONNECT
 								// All write-only registers... TODO: bus error?
 								handled = true;
 								break;
 							case 0x047000:		// [ef][4c][7F]xxx ==> Whole screen reverse video
 								break;
 						}
 						break;
 					case 0x050000:		// [ef][5d]xxxx ==> 8274
 						break;
 					case 0x060000:		// [ef][6e]xxxx ==> Control regs
 						switch (address & 0x07F000) {
 							default:
 								break;
 						}
 						break;
 					case 0x070000:		// [ef][7f]xxxx ==> 6850 Keyboard Controller
 						break;
 				}
 		}
 	}
 	LOG_NOT_HANDLED_R(16);
 	return data;
 }
 /**
  * @brief Read M68K memory, 8-bit
  */
 uint32_t m68k_read_memory_8(uint32_t address)
 {
 	uint8_t data = 0xFF;
 	bool handled = false;
 	// If ROMLMAP is set, force system to access ROM
 	if (!state.romlmap)
 		address |= 0x800000;
 	// Check access permissions
 	ACCESS_CHECK_RD(address, 8);
 	if ((address >= 0x800000) && (address <= 0xBFFFFF)) {
 		// ROM access
 		data = RD8(state.rom, address, ROM_SIZE - 1);
 		handled = true;
 	} else if (address <= (state.ram_size - 1)) {
 		// RAM access
 		data = RD8(state.ram, mapAddr(address, false), state.ram_size - 1);
 		handled = true;
 	} else if ((address >= 0x400000) && (address <= 0x7FFFFF)) {
 		// I/O register space, zone A
 		switch (address & 0x0F0000) {
 			case 0x000000:				// Map RAM access
 				if (address > 0x4007FF) fprintf(stderr, "NOTE: RD8 from MapRAM mirror, addr=0x%08X\n", address);
 				data = RD8(state.map, address, 0x7FF);
 				handled = true;
 				break;
 			case 0x010000:				// General Status Register
 				if ((address & 1) == 0)
 					data = (state.genstat >> 8) & 0xff;
 				else
 					data = (state.genstat)      & 0xff;
 				handled = true;
 				break;
 			case 0x020000:				// Video RAM
 				if (address > 0x427FFF) fprintf(stderr, "NOTE: RD8 from VideoRAM mirror, addr=0x%08X\n", address);
 				data = RD8(state.vram, address, 0x7FFF);
 				handled = true;
 				break;
 			case 0x030000:				// Bus Status Register 0
 				if ((address & 1) == 0)
 					data = (state.bsr0 >> 8) & 0xff;
 				else
 					data = (state.bsr0)      & 0xff;
 				handled = true;
 				break;
 			case 0x040000:				// Bus Status Register 1
 				if ((address & 1) == 0)
 					data = (state.bsr1 >> 8) & 0xff;
 				else
 					data = (state.bsr1)      & 0xff;
 				handled = true;
 				break;
 			case 0x050000:				// Phone status
 				break;
 			case 0x060000:				// DMA Count
 				break;
 			case 0x070000:				// Line Printer Status Register
 				break;
 			case 0x080000:				// Real Time Clock
 				break;
 			case 0x090000:				// Phone registers
 				switch (address & 0x0FF000) {
 					case 0x090000:		// Handset relay
 					case 0x098000:
 						break;
 					case 0x091000:		// Line select 2
 					case 0x099000:
 						break;
 					case 0x092000:		// Hook relay 1
 					case 0x09A000:
 						break;
 					case 0x093000:		// Hook relay 2
 					case 0x09B000:
 						break;
 					case 0x094000:		// Line 1 hold
 					case 0x09C000:
 						break;
 					case 0x095000:		// Line 2 hold
 					case 0x09D000:
 						break;
 					case 0x096000:		// Line 1 A-lead
 					case 0x09E000:
 						break;
 					case 0x097000:		// Line 2 A-lead
 					case 0x09F000:
 						break;
 				}
 				break;
 			case 0x0A0000:				// Miscellaneous Control Register -- write only!
 				handled = true;
 				break;
 			case 0x0B0000:				// TM/DIALWR
 				break;
 			case 0x0C0000:				// Clear Status Register -- write only!
 				handled = true;
 				break;
 			case 0x0D0000:				// DMA Address Register
 				break;
 			case 0x0E0000:				// Disk Control Register
 				break;
 			case 0x0F0000:				// Line Printer Data Register
 				break;
 		}
 	} else if ((address >= 0xC00000) && (address <= 0xFFFFFF)) {
 		// I/O register space, zone B
 		switch (address & 0xF00000) {
 			case 0xC00000:				// Expansion slots
 			case 0xD00000:
 				switch (address & 0xFC0000) {
 					case 0xC00000:		// Expansion slot 0
 					case 0xC40000:		// Expansion slot 1
 					case 0xC80000:		// Expansion slot 2
 					case 0xCC0000:		// Expansion slot 3
 					case 0xD00000:		// Expansion slot 4
 					case 0xD40000:		// Expansion slot 5
 					case 0xD80000:		// Expansion slot 6
 					case 0xDC0000:		// Expansion slot 7
 						fprintf(stderr, "NOTE: RD8 from expansion card space, addr=0x%08X\n", address);
 						break;
 				}
 				break;
 			case 0xE00000:				// HDC, FDC, MCR2 and RTC data bits
 			case 0xF00000:
 				switch (address & 0x070000) {
 					case 0x000000:		// [ef][08]xxxx ==> WD1010 hard disc controller
 						break;
 					case 0x010000:		// [ef][19]xxxx ==> WD2797 floppy disc controller
 						break;
 					case 0x020000:		// [ef][2a]xxxx ==> Miscellaneous Control Register 2
 						break;
 					case 0x030000:		// [ef][3b]xxxx ==> Real Time Clock data bits
 						break;
 					case 0x040000:		// [ef][4c]xxxx ==> General Control Register
 						switch (address & 0x077000) {
 							case 0x040000:		// [ef][4c][08]xxx ==> EE
 							case 0x041000:		// [ef][4c][19]xxx ==> PIE
 							case 0x042000:		// [ef][4c][2A]xxx ==> BP
 							case 0x043000:		// [ef][4c][3B]xxx ==> ROMLMAP
 							case 0x044000:		// [ef][4c][4C]xxx ==> L1 MODEM
 							case 0x045000:		// [ef][4c][5D]xxx ==> L2 MODEM
 							case 0x046000:		// [ef][4c][6E]xxx ==> D/N CONNECT
 								// All write-only registers... TODO: bus error?
 								handled = true;
 								break;
 							case 0x047000:		// [ef][4c][7F]xxx ==> Whole screen reverse video
 								break;
 						}
 					case 0x050000:		// [ef][5d]xxxx ==> 8274
 						break;
 					case 0x060000:		// [ef][6e]xxxx ==> Control regs
 						switch (address & 0x07F000) {
 							default:
 								break;
 						}
 						break;
 					case 0x070000:		// [ef][7f]xxxx ==> 6850 Keyboard Controller
 						break;
 				}
 		}
 	}
 	LOG_NOT_HANDLED_R(8);
 	return data;
 }
 /**
  * @brief Write M68K memory, 32-bit
  */
 void m68k_write_memory_32(uint32_t address, uint32_t value)
 {
 	bool handled = false;
 	// If ROMLMAP is set, force system to access ROM
 	if (!state.romlmap)
 		address |= 0x800000;
 	// Check access permissions
 	ACCESS_CHECK_WR(address, 32);
 	if ((address >= 0x800000) && (address <= 0xBFFFFF)) {
 		// ROM access
 		handled = true;
 	} else if (address <= (state.ram_size - 1)) {
 		// RAM access
 		WR32(state.ram, mapAddr(address, false), state.ram_size - 1, value);
 		handled = true;
 	} else if ((address >= 0x400000) && (address <= 0x7FFFFF)) {
 		// I/O register space, zone A
 		switch (address & 0x0F0000) {
 			case 0x000000:				// Map RAM access
 				if (address > 0x4007FF) fprintf(stderr, "NOTE: WR32 to MapRAM mirror, addr=0x%08X, data=0x%08X\n", address, value);
 				WR32(state.map, address, 0x7FF, value);
 				handled = true;
 				break;
 			case 0x010000:				// General Status Register
 				state.genstat = (value & 0xffff);
 				handled = true;
 				break;
 			case 0x020000:				// Video RAM
 				if (address > 0x427FFF) fprintf(stderr, "NOTE: WR32 to VideoRAM mirror, addr=0x%08X, data=0x%08X\n", address, value);
 				WR32(state.vram, address, 0x7FFF, value);
 				handled = true;
 				break;
 			case 0x030000:				// Bus Status Register 0
 				break;
 			case 0x040000:				// Bus Status Register 1
 				break;
 			case 0x050000:				// Phone status
 				break;
 			case 0x060000:				// DMA Count
 				break;
 			case 0x070000:				// Line Printer Status Register
 				break;
 			case 0x080000:				// Real Time Clock
 				break;
 			case 0x090000:				// Phone registers
 				switch (address & 0x0FF000) {
 					case 0x090000:		// Handset relay
 					case 0x098000:
 						break;
 					case 0x091000:		// Line select 2
 					case 0x099000:
 						break;
 					case 0x092000:		// Hook relay 1
 					case 0x09A000:
 						break;
 					case 0x093000:		// Hook relay 2
 					case 0x09B000:
 						break;
 					case 0x094000:		// Line 1 hold
 					case 0x09C000:
 						break;
 					case 0x095000:		// Line 2 hold
 					case 0x09D000:
 						break;
 					case 0x096000:		// Line 1 A-lead
 					case 0x09E000:
 						break;
 					case 0x097000:		// Line 2 A-lead
 					case 0x09F000:
 						break;
 				}
 				break;
 			case 0x0A0000:				// Miscellaneous Control Register
 				// TODO: handle the ctrl bits properly
 				state.leds = (~value & 0xF00) >> 8;
 				printf("LEDs: %s %s %s %s\n",
 						(state.leds & 8) ? "R" : "-",
 						(state.leds & 4) ? "G" : "-",
 						(state.leds & 2) ? "Y" : "-",
 						(state.leds & 1) ? "R" : "-");
 				handled = true;
 				break;
 			case 0x0B0000:				// TM/DIALWR
 				break;
 			case 0x0C0000:				// Clear Status Register
 				state.genstat = 0xFFFF;
 				state.bsr0 = 0xFFFF;
 				state.bsr1 = 0xFFFF;
 				handled = true;
 				break;
 			case 0x0D0000:				// DMA Address Register
 				break;
 			case 0x0E0000:				// Disk Control Register
 				break;
 			case 0x0F0000:				// Line Printer Data Register
 				break;
 		}
 	} else if ((address >= 0xC00000) && (address <= 0xFFFFFF)) {
 		// I/O register space, zone B
 		switch (address & 0xF00000) {
 			case 0xC00000:				// Expansion slots
 			case 0xD00000:
 				switch (address & 0xFC0000) {
 					case 0xC00000:		// Expansion slot 0
 					case 0xC40000:		// Expansion slot 1
 					case 0xC80000:		// Expansion slot 2
 					case 0xCC0000:		// Expansion slot 3
 					case 0xD00000:		// Expansion slot 4
 					case 0xD40000:		// Expansion slot 5
 					case 0xD80000:		// Expansion slot 6
 					case 0xDC0000:		// Expansion slot 7
 						fprintf(stderr, "NOTE: WR32 to expansion card space, addr=0x%08X, data=0x%08X\n", address, value);
 						handled = true;
 						break;
 				}
 				break;
 			case 0xE00000:				// HDC, FDC, MCR2 and RTC data bits
 			case 0xF00000:
 				switch (address & 0x070000) {
 					case 0x000000:		// [ef][08]xxxx ==> WD1010 hard disc controller
 						break;
 					case 0x010000:		// [ef][19]xxxx ==> WD2797 floppy disc controller
 						break;
 					case 0x020000:		// [ef][2a]xxxx ==> Miscellaneous Control Register 2
 						break;
 					case 0x030000:		// [ef][3b]xxxx ==> Real Time Clock data bits
 						break;
 					case 0x040000:		// [ef][4c]xxxx ==> General Control Register
 						switch (address & 0x077000) {
 							case 0x040000:		// [ef][4c][08]xxx ==> EE
 								break;
 							case 0x041000:		// [ef][4c][19]xxx ==> PIE
 								state.pie = ((value & 0x8000) == 0x8000);
 								handled = true;
 								break;
 							case 0x042000:		// [ef][4c][2A]xxx ==> BP
 								break;
 							case 0x043000:		// [ef][4c][3B]xxx ==> ROMLMAP
 								state.romlmap = ((value & 0x8000) == 0x8000);
 								handled = true;
 								break;
 							case 0x044000:		// [ef][4c][4C]xxx ==> L1 MODEM
 								break;
 							case 0x045000:		// [ef][4c][5D]xxx ==> L2 MODEM
 								break;
 							case 0x046000:		// [ef][4c][6E]xxx ==> D/N CONNECT
 								break;
 							case 0x047000:		// [ef][4c][7F]xxx ==> Whole screen reverse video
 								break;
 						}
 					case 0x050000:		// [ef][5d]xxxx ==> 8274
 						break;
 					case 0x060000:		// [ef][6e]xxxx ==> Control regs
 						switch (address & 0x07F000) {
 							default:
 								break;
 						}
 						break;
 					case 0x070000:		// [ef][7f]xxxx ==> 6850 Keyboard Controller
 						break;
 				}
 		}
 	}
 	LOG_NOT_HANDLED_W(32);
 }
 /**
  * @brief Write M68K memory, 16-bit
  */
 void m68k_write_memory_16(uint32_t address, uint32_t value)
 {
 	bool handled = false;
 	// If ROMLMAP is set, force system to access ROM
 	if (!state.romlmap)
 		address |= 0x800000;
 	// Check access permissions
 	ACCESS_CHECK_WR(address, 16);
 	if ((address >= 0x800000) && (address <= 0xBFFFFF)) {
 		// ROM access
 		handled = true;
 	} else if (address <= (state.ram_size - 1)) {
 		// RAM access
 		WR16(state.ram, mapAddr(address, false), state.ram_size - 1, value);
 		handled = true;
 	} else if ((address >= 0x400000) && (address <= 0x7FFFFF)) {
 		// I/O register space, zone A
 		switch (address & 0x0F0000) {
 			case 0x000000:				// Map RAM access
 				if (address > 0x4007FF) fprintf(stderr, "NOTE: WR16 to MapRAM mirror, addr=0x%08X, data=0x%04X\n", address, value);
 				WR16(state.map, address, 0x7FF, value);
 				handled = true;
 				break;
 			case 0x010000:				// General Status Register (read only)
 				handled = true;
 				break;
 			case 0x020000:				// Video RAM
 				if (address > 0x427FFF) fprintf(stderr, "NOTE: WR16 to VideoRAM mirror, addr=0x%08X, data=0x%04X\n", address, value);
 				WR16(state.vram, address, 0x7FFF, value);
 				handled = true;
 				break;
 			case 0x030000:				// Bus Status Register 0 (read only)
 				handled = true;
 				break;
 			case 0x040000:				// Bus Status Register 1 (read only)
 				handled = true;
 				break;
 			case 0x050000:				// Phone status
 				break;
 			case 0x060000:				// DMA Count
 				break;
 			case 0x070000:				// Line Printer Status Register
 				break;
 			case 0x080000:				// Real Time Clock
 				break;
 			case 0x090000:				// Phone registers
 				switch (address & 0x0FF000) {
 					case 0x090000:		// Handset relay
 					case 0x098000:
 						break;
 					case 0x091000:		// Line select 2
 					case 0x099000:
 						break;
 					case 0x092000:		// Hook relay 1
 					case 0x09A000:
 						break;
 					case 0x093000:		// Hook relay 2
 					case 0x09B000:
 						break;
 					case 0x094000:		// Line 1 hold
 					case 0x09C000:
 						break;
 					case 0x095000:		// Line 2 hold
 					case 0x09D000:
 						break;
 					case 0x096000:		// Line 1 A-lead
 					case 0x09E000:
 						break;
 					case 0x097000:		// Line 2 A-lead
 					case 0x09F000:
 						break;
 				}
 				break;
 			case 0x0A0000:				// Miscellaneous Control Register
 				// TODO: handle the ctrl bits properly
 				state.leds = (~value & 0xF00) >> 8;
 				printf("LEDs: %s %s %s %s\n",
 						(state.leds & 8) ? "R" : "-",
 						(state.leds & 4) ? "G" : "-",
 						(state.leds & 2) ? "Y" : "-",
 						(state.leds & 1) ? "R" : "-");
 				handled = true;
 				break;
 			case 0x0B0000:				// TM/DIALWR
 				break;
 			case 0x0C0000:				// Clear Status Register
 				state.genstat = 0xFFFF;
 				state.bsr0 = 0xFFFF;
 				state.bsr1 = 0xFFFF;
 				handled = true;
 				break;
 			case 0x0D0000:				// DMA Address Register
 				break;
 			case 0x0E0000:				// Disk Control Register
 				break;
 			case 0x0F0000:				// Line Printer Data Register
 				break;
 		}
 	} else if ((address >= 0xC00000) && (address <= 0xFFFFFF)) {
 		// I/O register space, zone B
 		switch (address & 0xF00000) {
 			case 0xC00000:				// Expansion slots
 			case 0xD00000:
 				switch (address & 0xFC0000) {
 					case 0xC00000:		// Expansion slot 0
 					case 0xC40000:		// Expansion slot 1
 					case 0xC80000:		// Expansion slot 2
 					case 0xCC0000:		// Expansion slot 3
 					case 0xD00000:		// Expansion slot 4
 					case 0xD40000:		// Expansion slot 5
 					case 0xD80000:		// Expansion slot 6
 					case 0xDC0000:		// Expansion slot 7
 						fprintf(stderr, "NOTE: WR16 to expansion card space, addr=0x%08X, data=0x%04X\n", address, value);
 						break;
 				}
 				break;
 			case 0xE00000:				// HDC, FDC, MCR2 and RTC data bits
 			case 0xF00000:
 				switch (address & 0x070000) {
 					case 0x000000:		// [ef][08]xxxx ==> WD1010 hard disc controller
 						break;
 					case 0x010000:		// [ef][19]xxxx ==> WD2797 floppy disc controller
 						break;
 					case 0x020000:		// [ef][2a]xxxx ==> Miscellaneous Control Register 2
 						break;
 					case 0x030000:		// [ef][3b]xxxx ==> Real Time Clock data bits
 						break;
 					case 0x040000:		// [ef][4c]xxxx ==> General Control Register
 						switch (address & 0x077000) {
 							case 0x040000:		// [ef][4c][08]xxx ==> EE
 								break;
 							case 0x041000:		// [ef][4c][19]xxx ==> PIE
 								state.pie = ((value & 0x8000) == 0x8000);
 								handled = true;
 								break;
 							case 0x042000:		// [ef][4c][2A]xxx ==> BP
 								break;
 							case 0x043000:		// [ef][4c][3B]xxx ==> ROMLMAP
 								state.romlmap = ((value & 0x8000) == 0x8000);
 								handled = true;
 								break;
 							case 0x044000:		// [ef][4c][4C]xxx ==> L1 MODEM
 								break;
 							case 0x045000:		// [ef][4c][5D]xxx ==> L2 MODEM
 								break;
 							case 0x046000:		// [ef][4c][6E]xxx ==> D/N CONNECT
 								break;
 							case 0x047000:		// [ef][4c][7F]xxx ==> Whole screen reverse video
 								break;
 						}
 					case 0x050000:		// [ef][5d]xxxx ==> 8274
 						break;
 					case 0x060000:		// [ef][6e]xxxx ==> Control regs
 						switch (address & 0x07F000) {
 							default:
 								break;
 						}
 						break;
 					case 0x070000:		// [ef][7f]xxxx ==> 6850 Keyboard Controller
 						break;
 				}
 		}
 	}
 	LOG_NOT_HANDLED_W(16);
 }
 /**
  * @brief Write M68K memory, 8-bit
  */
 void m68k_write_memory_8(uint32_t address, uint32_t value)
 {
 	bool handled = false;
 	// If ROMLMAP is set, force system to access ROM
 	if (!state.romlmap)
 		address |= 0x800000;
 	// Check access permissions
 	ACCESS_CHECK_WR(address, 8);
 	if ((address >= 0x800000) && (address <= 0xBFFFFF)) {
 		// ROM access (read only!)
 		handled = true;
 	} else if (address <= (state.ram_size - 1)) {
 		// RAM access
 		WR8(state.ram, mapAddr(address, false), state.ram_size - 1, value);
 		handled = true;
 	} else if ((address >= 0x400000) && (address <= 0x7FFFFF)) {
 		// I/O register space, zone A
 		switch (address & 0x0F0000) {
 			case 0x000000:				// Map RAM access
 				if (address > 0x4007FF) fprintf(stderr, "NOTE: WR8 to MapRAM mirror, addr=%08X, data=%02X\n", address, value);
 				WR8(state.map, address, 0x7FF, value);
 				handled = true;
 				break;
 			case 0x010000:				// General Status Register
 				handled = true;
 				break;
 			case 0x020000:				// Video RAM
 				if (address > 0x427FFF) fprintf(stderr, "NOTE: WR8 to VideoRAM mirror, addr=%08X, data=0x%02X\n", address, value);
 				WR8(state.vram, address, 0x7FFF, value);
 				handled = true;
 				break;
 			case 0x030000:				// Bus Status Register 0
 				handled = true;
 				break;
 			case 0x040000:				// Bus Status Register 1
 				handled = true;
 				break;
 			case 0x050000:				// Phone status
 				break;
 			case 0x060000:				// DMA Count
 				break;
 			case 0x070000:				// Line Printer Status Register
 				break;
 			case 0x080000:				// Real Time Clock
 				break;
 			case 0x090000:				// Phone registers
 				switch (address & 0x0FF000) {
 					case 0x090000:		// Handset relay
 					case 0x098000:
 						break;
 					case 0x091000:		// Line select 2
 					case 0x099000:
 						break;
 					case 0x092000:		// Hook relay 1
 					case 0x09A000:
 						break;
 					case 0x093000:		// Hook relay 2
 					case 0x09B000:
 						break;
 					case 0x094000:		// Line 1 hold
 					case 0x09C000:
 						break;
 					case 0x095000:		// Line 2 hold
 					case 0x09D000:
 						break;
 					case 0x096000:		// Line 1 A-lead
 					case 0x09E000:
 						break;
 					case 0x097000:		// Line 2 A-lead
 					case 0x09F000:
 						break;
 				}
 				break;
 			case 0x0A0000:				// Miscellaneous Control Register
 				// TODO: handle the ctrl bits properly
 				if ((address & 1) == 0)
 					;// CTL bits
 				else
 					state.leds = (~value & 0xF);
 				printf("LEDs: %s %s %s %s\n",
 						(state.leds & 8) ? "R" : "-",
 						(state.leds & 4) ? "G" : "-",
 						(state.leds & 2) ? "Y" : "-",
 						(state.leds & 1) ? "R" : "-");
 				handled = true;
 				break;
 			case 0x0B0000:				// TM/DIALWR
 				break;
 			case 0x0C0000:				// Clear Status Register
 				state.genstat = 0xFFFF;
 				state.bsr0 = 0xFFFF;
 				state.bsr1 = 0xFFFF;
 				handled = true;
 				break;
 			case 0x0D0000:				// DMA Address Register
 				break;
 			case 0x0E0000:				// Disk Control Register
 				break;
 			case 0x0F0000:				// Line Printer Data Register
 				break;
 		}
 	} else if ((address >= 0xC00000) && (address <= 0xFFFFFF)) {
 		// I/O register space, zone B
 		switch (address & 0xF00000) {
 			case 0xC00000:				// Expansion slots
 			case 0xD00000:
 				switch (address & 0xFC0000) {
 					case 0xC00000:		// Expansion slot 0
 					case 0xC40000:		// Expansion slot 1
 					case 0xC80000:		// Expansion slot 2
 					case 0xCC0000:		// Expansion slot 3
 					case 0xD00000:		// Expansion slot 4
 					case 0xD40000:		// Expansion slot 5
 					case 0xD80000:		// Expansion slot 6
 					case 0xDC0000:		// Expansion slot 7
 						fprintf(stderr, "NOTE: WR8 to expansion card space, addr=0x%08X, data=0x%08X\n", address, value);
 						break;
 				}
 				break;
 			case 0xE00000:				// HDC, FDC, MCR2 and RTC data bits
 			case 0xF00000:
 				switch (address & 0x070000) {
 					case 0x000000:		// [ef][08]xxxx ==> WD1010 hard disc controller
 						break;
 					case 0x010000:		// [ef][19]xxxx ==> WD2797 floppy disc controller
 						break;
 					case 0x020000:		// [ef][2a]xxxx ==> Miscellaneous Control Register 2
 						break;
 					case 0x030000:		// [ef][3b]xxxx ==> Real Time Clock data bits
 						break;
 					case 0x040000:		// [ef][4c]xxxx ==> General Control Register
 						switch (address & 0x077000) {
 							case 0x040000:		// [ef][4c][08]xxx ==> EE
 								break;
 							case 0x041000:		// [ef][4c][19]xxx ==> PIE
 								if ((address & 1) == 0)
 									state.pie = ((value & 0x80) == 0x80);
 								handled = true;
 								break;
 							case 0x042000:		// [ef][4c][2A]xxx ==> BP
 								break;
 							case 0x043000:		// [ef][4c][3B]xxx ==> ROMLMAP
 								if ((address & 1) == 0)
 									state.romlmap = ((value & 0x80) == 0x80);
 								handled = true;
 								break;
 							case 0x044000:		// [ef][4c][4C]xxx ==> L1 MODEM
 								break;
 							case 0x045000:		// [ef][4c][5D]xxx ==> L2 MODEM
 								break;
 							case 0x046000:		// [ef][4c][6E]xxx ==> D/N CONNECT
 								break;
 							case 0x047000:		// [ef][4c][7F]xxx ==> Whole screen reverse video
 								break;
 						}
 					case 0x050000:		// [ef][5d]xxxx ==> 8274
 						break;
 					case 0x060000:		// [ef][6e]xxxx ==> Control regs
 						switch (address & 0x07F000) {
 							default:
 								break;
 						}
 						break;
 					case 0x070000:		// [ef][7f]xxxx ==> 6850 Keyboard Controller
 						break;
 					default:
 						fprintf(stderr, "NOTE: WR8 to undefined E/F-block space, addr=0x%08X, data=0x%08X\n", address, value);
 						break;
 				}
 		}
 	}
 	LOG_NOT_HANDLED_W(8);
 }
 // for the disassembler
 uint32_t m68k_read_disassembler_32(uint32_t addr) { return m68k_read_memory_32(addr); }
 uint32_t m68k_read_disassembler_16(uint32_t addr) { return m68k_read_memory_16(addr); }
 uint32_t m68k_read_disassembler_8 (uint32_t addr) { return m68k_read_memory_8 (addr); }

3b1emu / annotate

src/memory.c@7d14fab5e4aa (annotated)

src/memory.c