src/io.js - emulators/v86 - Rivoreo Source Code Repositories

 "use strict";

 /**
  * The ISA IO bus
  * Devices register their ports here
  *
  * @constructor
  */
 function IO(memory)
 {
     var me = this,
         memory_size = memory.size;

     function get_port_description(addr)
     {
         // via seabios ioport.h
         var ports = {
             0x0004: "PORT_DMA_ADDR_2",
             0x0005: "PORT_DMA_CNT_2",
             0x000a: "PORT_DMA1_MASK_REG",
             0x000b: "PORT_DMA1_MODE_REG",
             0x000c: "PORT_DMA1_CLEAR_FF_REG",
             0x000d: "PORT_DMA1_MASTER_CLEAR",
             0x0020: "PORT_PIC1_CMD",
             0x0021: "PORT_PIC1_DATA",
             0x0040: "PORT_PIT_COUNTER0",
             0x0041: "PORT_PIT_COUNTER1",
             0x0042: "PORT_PIT_COUNTER2",
             0x0043: "PORT_PIT_MODE",
             0x0060: "PORT_PS2_DATA",
             0x0061: "PORT_PS2_CTRLB",
             0x0064: "PORT_PS2_STATUS",
             0x0070: "PORT_CMOS_INDEX",
             0x0071: "PORT_CMOS_DATA",
             0x0080: "PORT_DIAG",
             0x0081: "PORT_DMA_PAGE_2",
             0x0092: "PORT_A20",
             0x00a0: "PORT_PIC2_CMD",
             0x00a1: "PORT_PIC2_DATA",
             0x00b2: "PORT_SMI_CMD",
             0x00b3: "PORT_SMI_STATUS",
             0x00d4: "PORT_DMA2_MASK_REG",
             0x00d6: "PORT_DMA2_MODE_REG",
             0x00da: "PORT_DMA2_MASTER_CLEAR",
             0x00f0: "PORT_MATH_CLEAR",
             0x0170: "PORT_ATA2_CMD_BASE",
             0x01f0: "PORT_ATA1_CMD_BASE",
             0x0278: "PORT_LPT2",
             0x02e8: "PORT_SERIAL4",
             0x02f8: "PORT_SERIAL2",
             0x0374: "PORT_ATA2_CTRL_BASE",
             0x0378: "PORT_LPT1",
             0x03e8: "PORT_SERIAL3",
             //0x03f4: "PORT_ATA1_CTRL_BASE",
             0x03f0: "PORT_FD_BASE",
             0x03f2: "PORT_FD_DOR",
             0x03f4: "PORT_FD_STATUS",
             0x03f5: "PORT_FD_DATA",
             0x03f6: "PORT_HD_DATA",
             0x03f7: "PORT_FD_DIR",
             0x03f8: "PORT_SERIAL1",
             0x0cf8: "PORT_PCI_CMD",
             0x0cf9: "PORT_PCI_REBOOT",
             0x0cfc: "PORT_PCI_DATA",
             0x0402: "PORT_BIOS_DEBUG",
             0x0510: "PORT_QEMU_CFG_CTL",
             0x0511: "PORT_QEMU_CFG_DATA",
             0xb000: "PORT_ACPI_PM_BASE",
             0xb100: "PORT_SMB_BASE",
             0x8900:  "PORT_BIOS_APM"
         };

         if(ports[addr])
         {
             return "  (" + ports[addr] + ")";
         }
         else
         {
             return "";
         }
     }

     function empty_port_read_debug(port_addr)
     {
         dbg_log(
             "read port  #" + h(port_addr, 3) + get_port_description(port_addr),
             LOG_IO
         );

         return 0xFF;
     }

     function empty_port_write_debug(out_byte, port_addr)
     {
         dbg_log(
             "write port #" + h(port_addr, 3) + " <- " + h(out_byte, 2) + get_port_description(port_addr),
             LOG_IO
         );
     }

     function empty_port_read()
     {
         return 0xFF;
     }

     function empty_port_write(x)
     {
     }

     // Why 0x10003 if there are only 0x10000 ports:
     //   Reading/Writing from port 0xFFFF could make the number
     //   go outside of the valid range and cause an exception otherwise
     /** @const */
     var NUM_PORTS = 0x10003;

     var read_callbacks = Array(NUM_PORTS),
         write_callbacks = Array(NUM_PORTS);

     for(var i = 0; i < NUM_PORTS; i++)
     {
         // avoid sparse arrays

         if(DEBUG)
         {
             read_callbacks[i] = empty_port_read_debug;
             write_callbacks[i] = empty_port_write_debug;
         }
         else
         {
             read_callbacks[i] = empty_port_read;
             write_callbacks[i] = empty_port_write;
         }
     }

     /**
      * @param {number} port_addr
      * @param {function():number} callback
      */
     this.register_read = function(port_addr, callback)
     {
         read_callbacks[port_addr] = callback;
     };

     /**
      * @param {number} port_addr
      * @param {function(number)} callback
      */
     this.register_write = function(port_addr, callback)
     {
         write_callbacks[port_addr] = callback;
     };

     // remember registrations in the RAM area, used by in_mmap_range
     var low_memory_registered = new Uint8Array(memory_size >> MMAP_BLOCK_BITS);

     /**
      * @param addr {number}
      * @param size {number}
      *
      */
     this.mmap_register = function(addr, size, fn_size, read_func, write_func)
     {
         dbg_log("mmap_register addr=" + h(addr >>> 0, 8) + " size=" + h(size, 8) + " fn_size=" + fn_size, LOG_IO);

         dbg_assert((addr & MMAP_BLOCK_SIZE - 1) === 0);
         dbg_assert(size && (size & MMAP_BLOCK_SIZE - 1) === 0);
         dbg_assert(fn_size === 1 || fn_size === 4);

         var aligned_addr = addr >>> MMAP_BLOCK_BITS;

         for(; size > 0; aligned_addr++)
         {
             memory.memory_map_registered[aligned_addr] = fn_size;

             memory.memory_map_read[aligned_addr] = do_read;
             memory.memory_map_write[aligned_addr] = do_write;

             if((aligned_addr << MMAP_BLOCK_BITS) < memory_size)
             {
                 low_memory_registered[aligned_addr] = fn_size;
             }

             size -= MMAP_BLOCK_SIZE;
         }

         function do_read(read_addr)
         {
             return read_func(read_addr - addr | 0);
         }

         function do_write(write_addr, value)
         {
             write_func(write_addr - addr | 0, value);
         }
     };

     for(var i = 0; (i << MMAP_BLOCK_BITS) < memory_size; i++)
     {
         // avoid sparse arrays
         memory.memory_map_read[i] = memory.memory_map_write[i] = undefined;
     }

     this.mmap_register(memory_size, 0x100000000 - memory_size, 1,
         function(addr) {
             // read outside of the memory size
             addr += memory_size;
             dbg_log("Read from unmapped memory space, addr=" + h(addr >>> 0, 8), LOG_IO);
             return 0xFF;
         },
         function(addr, value) {
             // write outside of the memory size
             addr += memory_size;
             dbg_log("Write to unmapped memory space, addr=" + h(addr >>> 0, 8) + " value=" + h(value, 2), LOG_IO);
         });


     this.in_mmap_range = function(start, count)
     {
         var end = start + count;

         if(end >= memory_size)
         {
             return true;
         }

         start &= ~(MMAP_BLOCK_SIZE - 1);

         while(start < end)
         {
             if(low_memory_registered[start >> MMAP_BLOCK_BITS])
             {
                 return true;
             }

             start += MMAP_BLOCK_SIZE;
         }

         return false;
     };

     // any two consecutive 8-bit ports can be treated as a 16-bit port;
     // and four consecutive 8-bit ports can be treated as a 32-bit port
     //
     // http://css.csail.mit.edu/6.858/2012/readings/i386/s08_01.htm
     //
     // This info seems to be incorrect, at least some multibyte ports are next
     // to each other, such as 1CE and 1CF (VBE dispi) or the 170 (ATA data port).
     //
     // As a workaround, we pass the original port to the callback as the last argument.


     this.port_write8 = function(port_addr, out_byte)
     {
         write_callbacks[port_addr](out_byte, port_addr);
     };

     this.port_write16 = function(port_addr, out_byte)
     {
         write_callbacks[port_addr](out_byte & 0xFF, port_addr);
         write_callbacks[port_addr + 1](out_byte >> 8, port_addr);
     };

     this.port_write32 = function(port_addr, out_byte)
     {
         write_callbacks[port_addr](out_byte & 0xFF, port_addr);
         write_callbacks[port_addr + 1](out_byte >> 8 & 0xFF, port_addr);
         write_callbacks[port_addr + 2](out_byte >> 16 & 0xFF, port_addr);
         write_callbacks[port_addr + 3](out_byte >>> 24, port_addr);
     };

     // read byte from port
     this.port_read8 = function(port_addr)
     {
         return read_callbacks[port_addr](port_addr);
     };

     this.port_read16 = function(port_addr)
     {
         return read_callbacks[port_addr](port_addr) |
                     read_callbacks[port_addr + 1](port_addr) << 8;
     };

     this.port_read32 = function(port_addr)
     {
         return read_callbacks[port_addr](port_addr) |
                     read_callbacks[port_addr + 1](port_addr) << 8 |
                     read_callbacks[port_addr + 2](port_addr) << 16 |
                     read_callbacks[port_addr + 3](port_addr) << 24;
     };
 }
	"use strict";

	/**
	* The ISA IO bus
	* Devices register their ports here
	*
	* @constructor
	*/
	function IO(memory)
	{
	var me = this,
	memory_size = memory.size;

	function get_port_description(addr)
	{
	// via seabios ioport.h
	var ports = {
	0x0004: "PORT_DMA_ADDR_2",
	0x0005: "PORT_DMA_CNT_2",
	0x000a: "PORT_DMA1_MASK_REG",
	0x000b: "PORT_DMA1_MODE_REG",
	0x000c: "PORT_DMA1_CLEAR_FF_REG",
	0x000d: "PORT_DMA1_MASTER_CLEAR",
	0x0020: "PORT_PIC1_CMD",
	0x0021: "PORT_PIC1_DATA",
	0x0040: "PORT_PIT_COUNTER0",
	0x0041: "PORT_PIT_COUNTER1",
	0x0042: "PORT_PIT_COUNTER2",
	0x0043: "PORT_PIT_MODE",
	0x0060: "PORT_PS2_DATA",
	0x0061: "PORT_PS2_CTRLB",
	0x0064: "PORT_PS2_STATUS",
	0x0070: "PORT_CMOS_INDEX",
	0x0071: "PORT_CMOS_DATA",
	0x0080: "PORT_DIAG",
	0x0081: "PORT_DMA_PAGE_2",
	0x0092: "PORT_A20",
	0x00a0: "PORT_PIC2_CMD",
	0x00a1: "PORT_PIC2_DATA",
	0x00b2: "PORT_SMI_CMD",
	0x00b3: "PORT_SMI_STATUS",
	0x00d4: "PORT_DMA2_MASK_REG",
	0x00d6: "PORT_DMA2_MODE_REG",
	0x00da: "PORT_DMA2_MASTER_CLEAR",
	0x00f0: "PORT_MATH_CLEAR",
	0x0170: "PORT_ATA2_CMD_BASE",
	0x01f0: "PORT_ATA1_CMD_BASE",
	0x0278: "PORT_LPT2",
	0x02e8: "PORT_SERIAL4",
	0x02f8: "PORT_SERIAL2",
	0x0374: "PORT_ATA2_CTRL_BASE",
	0x0378: "PORT_LPT1",
	0x03e8: "PORT_SERIAL3",
	//0x03f4: "PORT_ATA1_CTRL_BASE",
	0x03f0: "PORT_FD_BASE",
	0x03f2: "PORT_FD_DOR",
	0x03f4: "PORT_FD_STATUS",
	0x03f5: "PORT_FD_DATA",
	0x03f6: "PORT_HD_DATA",
	0x03f7: "PORT_FD_DIR",
	0x03f8: "PORT_SERIAL1",
	0x0cf8: "PORT_PCI_CMD",
	0x0cf9: "PORT_PCI_REBOOT",
	0x0cfc: "PORT_PCI_DATA",
	0x0402: "PORT_BIOS_DEBUG",
	0x0510: "PORT_QEMU_CFG_CTL",
	0x0511: "PORT_QEMU_CFG_DATA",
	0xb000: "PORT_ACPI_PM_BASE",
	0xb100: "PORT_SMB_BASE",
	0x8900: "PORT_BIOS_APM"
	};

	if(ports[addr])
	{
	return " (" + ports[addr] + ")";
	}
	else
	{
	return "";
	}
	}

	function empty_port_read_debug(port_addr)
	{
	dbg_log(
	"read port #" + h(port_addr, 3) + get_port_description(port_addr),
	LOG_IO
	);

	return 0xFF;
	}

	function empty_port_write_debug(out_byte, port_addr)
	{
	dbg_log(
	"write port #" + h(port_addr, 3) + " <- " + h(out_byte, 2) + get_port_description(port_addr),
	LOG_IO
	);
	}

	function empty_port_read()
	{
	return 0xFF;
	}

	function empty_port_write(x)
	{
	}

	// Why 0x10003 if there are only 0x10000 ports:
	// Reading/Writing from port 0xFFFF could make the number
	// go outside of the valid range and cause an exception otherwise
	/** @const */
	var NUM_PORTS = 0x10003;

	var read_callbacks = Array(NUM_PORTS),
	write_callbacks = Array(NUM_PORTS);

	for(var i = 0; i < NUM_PORTS; i++)
	{
	// avoid sparse arrays

	if(DEBUG)
	{
	read_callbacks[i] = empty_port_read_debug;
	write_callbacks[i] = empty_port_write_debug;
	}
	else
	{
	read_callbacks[i] = empty_port_read;
	write_callbacks[i] = empty_port_write;
	}
	}

	/**
	* @param {number} port_addr
	* @param {function():number} callback
	*/
	this.register_read = function(port_addr, callback)
	{
	read_callbacks[port_addr] = callback;
	};

	/**
	* @param {number} port_addr
	* @param {function(number)} callback
	*/
	this.register_write = function(port_addr, callback)
	{
	write_callbacks[port_addr] = callback;
	};

	// remember registrations in the RAM area, used by in_mmap_range
	var low_memory_registered = new Uint8Array(memory_size >> MMAP_BLOCK_BITS);

	/**
	* @param addr {number}
	* @param size {number}
	*
	*/
	this.mmap_register = function(addr, size, fn_size, read_func, write_func)
	{
	dbg_log("mmap_register addr=" + h(addr >>> 0, 8) + " size=" + h(size, 8) + " fn_size=" + fn_size, LOG_IO);

	dbg_assert((addr & MMAP_BLOCK_SIZE - 1) === 0);
	dbg_assert(size && (size & MMAP_BLOCK_SIZE - 1) === 0);
	dbg_assert(fn_size === 1 \|\| fn_size === 4);

	var aligned_addr = addr >>> MMAP_BLOCK_BITS;

	for(; size > 0; aligned_addr++)
	{
	memory.memory_map_registered[aligned_addr] = fn_size;

	memory.memory_map_read[aligned_addr] = do_read;
	memory.memory_map_write[aligned_addr] = do_write;

	if((aligned_addr << MMAP_BLOCK_BITS) < memory_size)
	{
	low_memory_registered[aligned_addr] = fn_size;
	}

	size -= MMAP_BLOCK_SIZE;
	}

	function do_read(read_addr)
	{
	return read_func(read_addr - addr \| 0);
	}

	function do_write(write_addr, value)
	{
	write_func(write_addr - addr \| 0, value);
	}
	};

	for(var i = 0; (i << MMAP_BLOCK_BITS) < memory_size; i++)
	{
	// avoid sparse arrays
	memory.memory_map_read[i] = memory.memory_map_write[i] = undefined;
	}

	this.mmap_register(memory_size, 0x100000000 - memory_size, 1,
	function(addr) {
	// read outside of the memory size
	addr += memory_size;
	dbg_log("Read from unmapped memory space, addr=" + h(addr >>> 0, 8), LOG_IO);
	return 0xFF;
	},
	function(addr, value) {
	// write outside of the memory size
	addr += memory_size;
	dbg_log("Write to unmapped memory space, addr=" + h(addr >>> 0, 8) + " value=" + h(value, 2), LOG_IO);
	});


	this.in_mmap_range = function(start, count)
	{
	var end = start + count;

	if(end >= memory_size)
	{
	return true;
	}

	start &= ~(MMAP_BLOCK_SIZE - 1);

	while(start < end)
	{
	if(low_memory_registered[start >> MMAP_BLOCK_BITS])
	{
	return true;
	}

	start += MMAP_BLOCK_SIZE;
	}

	return false;
	};

	// any two consecutive 8-bit ports can be treated as a 16-bit port;
	// and four consecutive 8-bit ports can be treated as a 32-bit port
	//
	// http://css.csail.mit.edu/6.858/2012/readings/i386/s08_01.htm
	//
	// This info seems to be incorrect, at least some multibyte ports are next
	// to each other, such as 1CE and 1CF (VBE dispi) or the 170 (ATA data port).
	//
	// As a workaround, we pass the original port to the callback as the last argument.


	this.port_write8 = function(port_addr, out_byte)
	{
	write_callbacks[port_addr](out_byte, port_addr);
	};

	this.port_write16 = function(port_addr, out_byte)
	{
	write_callbacks[port_addr](out_byte & 0xFF, port_addr);
	write_callbacks[port_addr + 1](out_byte >> 8, port_addr);
	};

	this.port_write32 = function(port_addr, out_byte)
	{
	write_callbacks[port_addr](out_byte & 0xFF, port_addr);
	write_callbacks[port_addr + 1](out_byte >> 8 & 0xFF, port_addr);
	write_callbacks[port_addr + 2](out_byte >> 16 & 0xFF, port_addr);
	write_callbacks[port_addr + 3](out_byte >>> 24, port_addr);
	};

	// read byte from port
	this.port_read8 = function(port_addr)
	{
	return read_callbacks[port_addr](port_addr);
	};

	this.port_read16 = function(port_addr)
	{
	return read_callbacks[port_addr](port_addr) \|
	read_callbacks[port_addr + 1](port_addr) << 8;
	};

	this.port_read32 = function(port_addr)
	{
	return read_callbacks[port_addr](port_addr) \|
	read_callbacks[port_addr + 1](port_addr) << 8 \|
	read_callbacks[port_addr + 2](port_addr) << 16 \|
	read_callbacks[port_addr + 3](port_addr) << 24;
	};
	}