system.h

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/*
 * Copyright (c) 2023 Adrian "asie" Siekierka
 *
 * Licensed under the Apache License, Version 2.0 with LLVM Exceptions,
 * See https://github.com/llvm-mos/llvm-mos-sdk/blob/main/LICENSE for license
 * information.
 */
 
#ifndef _PCE_SYSTEM_H_
#define _PCE_SYSTEM_H_
 
#include <stdbool.h>
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define NTSC_COLORBURST_FREQ (315 * 1000000 / 88)
#define PCE_SYSTEM_FREQ (NTSC_COLORBURST_FREQ * 6)
#define PCE_CPU_FREQ (NTSC_COLORBURST_FREQ * 2)
#define PCE_TIMER_FREQ (PCE_CPU_FREQ / 1024)
 
void pce_irq_enable(uint8_t mask);
 
void pce_irq_disable(uint8_t mask);
 
#define PCE_FREQ_TO_TIMER(freq) ((PCE_TIMER_FREQ / (freq)) - 1)
 
void pce_timer_set(uint8_t count);
 
void pce_timer_enable(void);
 
void pce_timer_disable(void);
 
static inline void pce_cpu_irq_enable() {
  __attribute__((leaf)) asm volatile("cli\n");
}
 
static inline void pce_cpu_irq_disable() {
  __attribute__((leaf)) asm volatile("sei\n");
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* _PCE_SYSTEM_H_ */