

enum mem_content_type {
     MC_UNINIT,
     MC_DATA,
     MC_PUSHED_PC,
     MC_NUM_TYPES
};

enum mem_ptr_action
{
  MPA_WRITING,
  MPA_READING,
  MPA_CONTENT_TYPE,
  MPA_DECODE_CACHE
};

void init_mem (void);
void mem_usage_stats (void);
unsigned long mem_usage_cycles (void);

/* rx_mem_ptr returns a pointer which is valid as long as the address
   requested remains within the same page.  */
#define PAGE_BITS 12
#define PAGE_SIZE (1 << PAGE_BITS)
#define NONPAGE_MASK (~(PAGE_SIZE-1))

unsigned char *rx_mem_ptr (unsigned long address, enum mem_ptr_action action);
#ifdef RXC_never
RX_Opcode_Decoded **rx_mem_decode_cache (unsigned long address);
#endif

void mem_put_qi (int address, unsigned char value);
void mem_put_hi (int address, unsigned short value);
void mem_put_psi (int address, unsigned long value);
void mem_put_si (int address, unsigned long value);

void mem_put_blk (int address, void *bufptr, int nbytes);

unsigned char mem_get_pc (int address);

unsigned char mem_get_qi (int address);
unsigned short mem_get_hi (int address);
unsigned long mem_get_psi (int address);
unsigned long mem_get_si (int address);

void mem_get_blk (int address, void *bufptr, int nbytes);

int sign_ext (int v, int bits);

void mem_set_content_type (int address, enum mem_content_type type);
void mem_set_content_range (int start_address, int end_address, enum mem_content_type type);
enum mem_content_type mem_get_content_type (int address);
