sm64/include/macros.h

#ifndef _MACROS_H_
#define _MACROS_H_

#include "platform_info.h"

#define ARRAY_COUNT(arr) (s32)(sizeof(arr) / sizeof(arr[0]))

#define GLUE(a, b) a ## b
#define GLUE2(a, b) GLUE(a, b)

// Avoid compiler warnings for unused variables
#ifdef __GNUC__
#define UNUSED __attribute__((unused))
#else
#define UNUSED
#endif

// Static assertions
#ifdef __GNUC__
#define STATIC_ASSERT(cond, msg) _Static_assert(cond, msg)
#else
#define STATIC_ASSERT(cond, msg) typedef char GLUE2(static_assertion_failed, __LINE__)[(cond) ? 1 : -1]
#endif

// Align to 8-byte boundary for DMA requirements
#ifdef __GNUC__
#define ALIGNED8 __attribute__((aligned(8)))
#else
#define ALIGNED8
#endif

// Align to 16-byte boundary for audio lib requirements
#ifdef __GNUC__
#define ALIGNED16 __attribute__((aligned(16)))
#else
#define ALIGNED16
#endif

// convert a virtual address to physical.
#define VIRTUAL_TO_PHYSICAL(addr)   ((uintptr_t)(addr) & 0x1FFFFFFF)

// convert a physical address to virtual.
#define PHYSICAL_TO_VIRTUAL(addr)   ((uintptr_t)(addr) | 0x80000000)

// another way of converting virtual to physical
#define VIRTUAL_TO_PHYSICAL2(addr)  ((u8 *)(addr) - 0x80000000U)

#endif