src/state.h

Fri, 04 Mar 2011 00:41:52 +0000

author
Philip Pemberton <philpem@philpem.me.uk>
date
Fri, 04 Mar 2011 00:41:52 +0000
changeset 101
e20f02519835
parent 97
240e195e4bed
child 112
a392eb8f9806
permissions
-rw-r--r--

add Error Enable bit to system state

     1 #ifndef _STATE_H
     2 #define _STATE_H
     4 #include <stddef.h>
     5 #include <stdint.h>
     6 #include <stdbool.h>
     7 #include "wd279x.h"
     8 #include "keyboard.h"
    10 // Maximum size of the Boot PROMs. Must be a binary power of two.
    11 #define ROM_SIZE 32768
    13 /**
    14  * State error codes
    15  */
    16 typedef enum {
    17 	STATE_E_OK				= 0,	///< Operation succeeded
    18 	STATE_E_BAD_RAMSIZE		= -1,	///< Bad RAM size specified (not a multiple of 512K, or less than 512K)
    19 	STATE_E_NO_MEMORY		= -2,	///< Out of memory while allocating state variables
    20 	STATE_E_ROM_LOAD_FAIL	= -3	///< Error loading ROMs
    21 } STATE_ERR;
    23 /**
    24  * @brief Emulator state storage
    25  *
    26  * This structure stores the internal state of the emulator.
    27  */
    28 typedef struct {
    29 	// Boot PROM can be up to 32Kbytes total size
    30 	uint8_t		rom[ROM_SIZE];		///< Boot PROM data buffer
    32 	//// Main system RAM
    33 	uint8_t		*base_ram;			///< Base RAM data buffer
    34 	size_t		base_ram_size;		///< Size of Base RAM buffer in bytes
    35 	uint8_t		*exp_ram;			///< Expansion RAM data buffer
    36 	size_t		exp_ram_size;		///< Size of Expansion RAM buffer in bytes
    38 	/// Video RAM
    39 	uint8_t		vram[0x8000];
    41 	/// Map RAM
    42 	uint8_t		map[0x800];
    44 	//// Registers
    45 	uint16_t	genstat;			///< General Status Register
    46 	uint16_t	bsr0;				///< Bus Status Register 0
    47 	uint16_t	bsr1;				///< Bus Status Register 1
    49 	//// MISCELLANEOUS CONTROL REGISTER
    50 	bool		dma_reading;		///< True if Disc DMA reads from the controller, false otherwise
    51 	uint8_t		leds;				///< LED status, 1=on, in order red3/green2/yellow1/red0 from bit3 to bit0
    53 	bool		timer_enabled;
    54 	bool		timer_asserted;
    56 	//// GENERAL CONTROL REGISTER
    57 	/// GENCON.ROMLMAP -- false ORs the address with 0x800000, forcing the
    58 	/// 68010 to access ROM instead of RAM when booting. TRM page 2-36.
    59 	bool		romlmap;
    60 	/// GENCON.PIE -- Parity Error Check Enable
    61 	bool		pie;
    62 	/// GENCON.EE -- Error Enable
    63 	bool		ee;
    65 	/// DMA Address Register
    66 	uint32_t	dma_address;
    68 	/// DMA count
    69 	uint32_t	dma_count;
    71 	/// DMA direction
    72 	bool		idmarw;
    73 	/// DMA enable
    74 	bool		dmaen;
    75 	bool		dmaenb;
    77 	/// Floppy disc controller context
    78 	WD2797_CTX	fdc_ctx;
    79 	/// Current disc image file
    80 	FILE *fdc_disc;
    82 	/// Keyboard controller context
    83 	KEYBOARD_STATE	kbd;
    84 } S_state;
    86 // Global emulator state. Yes, I know global variables are evil, please don't
    87 // email me and lecture me about it.  -philpem
    88 #ifndef _STATE_C
    89 extern S_state state;
    90 #else
    91 S_state state;
    92 #endif
    94 /**
    95  * @brief	Initialise system state
    96  *
    97  * @param	base_ram_size		Base RAM size in bytes -- must be a multiple of 512KiB, min 512KiB, max 2MiB.
    98  * @param	exp_ram_size		Expansion RAM size in bytes -- must be a multiple of 512KiB, min 0, max 2MiB.
    99  *
   100  * Initialises the emulator's internal state.
   101  */
   102 int state_init(size_t base_ram_size, size_t exp_ram_size);
   104 /**
   105  * @brief Deinitialise system state
   106  *
   107  * Deinitialises the saved state, and frees all memory. Call this function
   108  * before exiting your program to avoid memory leaks.
   109  */
   110 void state_done();
   112 #endif