src/state.h

Fri, 18 Jan 2013 17:20:07 +0000

author
Philip Pemberton <philpem@philpem.me.uk>
date
Fri, 18 Jan 2013 17:20:07 +0000
changeset 130
1fc7d607dbb4
parent 112
a392eb8f9806
child 142
cfa30b1cd92f
child 151
b63a3999e2e7
permissions
-rw-r--r--

[wd2010] disable DMA pagefault workaround (no longer required)

     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 "wd2010.h"
     9 #include "keyboard.h"
    11 // Maximum size of the Boot PROMs. Must be a binary power of two.
    12 #define ROM_SIZE 32768
    14 /**
    15  * State error codes
    16  */
    17 typedef enum {
    18 	STATE_E_OK				= 0,	///< Operation succeeded
    19 	STATE_E_BAD_RAMSIZE		= -1,	///< Bad RAM size specified (not a multiple of 512K, or less than 512K)
    20 	STATE_E_NO_MEMORY		= -2,	///< Out of memory while allocating state variables
    21 	STATE_E_ROM_LOAD_FAIL	= -3	///< Error loading ROMs
    22 } STATE_ERR;
    24 /**
    25  * @brief Emulator state storage
    26  *
    27  * This structure stores the internal state of the emulator.
    28  */
    29 typedef struct {
    30 	// Boot PROM can be up to 32Kbytes total size
    31 	uint8_t		rom[ROM_SIZE];		///< Boot PROM data buffer
    33 	//// Main system RAM
    34 	uint8_t		*base_ram;			///< Base RAM data buffer
    35 	size_t		base_ram_size;		///< Size of Base RAM buffer in bytes
    36 	uint8_t		*exp_ram;			///< Expansion RAM data buffer
    37 	size_t		exp_ram_size;		///< Size of Expansion RAM buffer in bytes
    39 	/// Video RAM
    40 	uint8_t		vram[0x8000];
    42 	/// Map RAM
    43 	uint8_t		map[0x800];
    45 	//// Registers
    46 	uint16_t	genstat;			///< General Status Register
    47 	uint16_t	bsr0;				///< Bus Status Register 0
    48 	uint16_t	bsr1;				///< Bus Status Register 1
    50 	//// MISCELLANEOUS CONTROL REGISTER
    51 	bool		dma_reading;		///< True if Disc DMA reads from the controller, false otherwise
    52 	uint8_t		leds;				///< LED status, 1=on, in order red3/green2/yellow1/red0 from bit3 to bit0
    54 	bool		timer_enabled;
    55 	bool		timer_asserted;
    57 	//// GENERAL CONTROL REGISTER
    58 	/// GENCON.ROMLMAP -- false ORs the address with 0x800000, forcing the
    59 	/// 68010 to access ROM instead of RAM when booting. TRM page 2-36.
    60 	bool		romlmap;
    61 	/// GENCON.PIE -- Parity Error Check Enable
    62 	bool		pie;
    63 	/// GENCON.EE -- Error Enable
    64 	bool		ee;
    66 	/// DMA Address Register
    67 	uint32_t	dma_address;
    69 	/// DMA count
    70 	uint32_t	dma_count;
    72 	/// DMA direction
    73 	bool		idmarw;
    74 	/// DMA enable
    75 	bool		dmaen;
    76 	bool		dmaenb;
    78 	/// DMA device selection flags
    79 	bool		fd_selected;
    80 	bool       	hd_selected;
    81 	/// Floppy disc controller context
    82 	WD2797_CTX	fdc_ctx;
    83 	/// Current disc image file
    84 	FILE *fdc_disc;
    86 	/// Hard disc controller context
    87 	WD2010_CTX  hdc_ctx;
    88 	FILE *hdc_disc0;
    89 	FILE *hdc_disc1;
    91 	/// Keyboard controller context
    92 	KEYBOARD_STATE	kbd;
    93 } S_state;
    95 // Global emulator state. Yes, I know global variables are evil, please don't
    96 // email me and lecture me about it.  -philpem
    97 #ifndef _STATE_C
    98 extern S_state state;
    99 #else
   100 S_state state;
   101 #endif
   103 /**
   104  * @brief	Initialise system state
   105  *
   106  * @param	base_ram_size		Base RAM size in bytes -- must be a multiple of 512KiB, min 512KiB, max 2MiB.
   107  * @param	exp_ram_size		Expansion RAM size in bytes -- must be a multiple of 512KiB, min 0, max 2MiB.
   108  *
   109  * Initialises the emulator's internal state.
   110  */
   111 int state_init(size_t base_ram_size, size_t exp_ram_size);
   113 /**
   114  * @brief Deinitialise system state
   115  *
   116  * Deinitialises the saved state, and frees all memory. Call this function
   117  * before exiting your program to avoid memory leaks.
   118  */
   119 void state_done();
   121 #endif