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/*

 * cpu.h -- CPU simulation

 */

#ifndef _CPU_H_

#define _CPU_H_

#define IRQ_TIMER       14              /* timer interrupt */

#define IRQ_DISK        8               /* disk interrupt */

#define IRQ_KEYBOARD    4               /* keyboard interrupt */

#define IRQ_TERM_1_RCVR 3               /* terminal 1 receiver interrupt */

#define IRQ_TERM_1_XMTR 2               /* terminal 1 transmitter interrupt */

#define IRQ_TERM_0_RCVR 1               /* terminal 0 receiver interrupt */

#define IRQ_TERM_0_XMTR 0                /* terminal 0 transmitter interrupt */

#define PSW_V           0x08000000      /* interrupt vector bit in PSW */

#define PSW_UM          0x04000000      /* user mode enable bit in PSW */

#define PSW_PUM         0x02000000      /* previous value of PSW_UM */

#define PSW_OUM         0x01000000      /* old value of PSW_UM */

#define PSW_IE          0x00800000      /* interrupt enable bit in PSW */

#define PSW_PIE         0x00400000      /* previous value of PSW_IE */

#define PSW_OIE         0x00200000      /* old value of PSW_IE */

#define PSW_PRIO_MASK   0x001F0000      /* bits to encode IRQ prio in PSW */

#define PSW_PRIO_SHFT   16              /* shift count to reach these bits */

#define PSW_IRQ_MASK    0x0000FFFF      /* IRQ mask bits */

Word cpuGetPC(void);

void cpuSetPC(Word addr);

Word cpuGetReg(int regnum);

void cpuSetReg(int regnum, Word value);

Word cpuGetPSW(void);

void cpuSetPSW(Word value);

Word cpuGetIRQ(void);

Bool cpuTestBreak(void);

Word cpuGetBreak(void);

void cpuSetBreak(Word addr);

void cpuResetBreak(void);

Word cpuGetTotal(void);

void cpuStep(void);

void cpuRun(void);

void cpuHalt(void);

void cpuSetInterrupt(int priority);

void cpuResetInterrupt(int priority);

void cpuReset(void);

void cpuInit(Word initialPC);

void cpuExit(void);

#endif /* _CPU_H_ */