rockbox/firmware/system.h

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2002 by Alan Korr
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#ifndef __SYSTEM_H__
#define __SYSTEM_H__
#include <sh7034.h>

/*
 *   11.059,200 MHz => 90.4224537037037037037037037037037... ns
 *   12.000,000 MHz => 83.3333333333333333333333333333333... ns 
 */

#define FREQ     12000000
#define BAUDRATE 9600

//#define PHI ((int)(11.059200 MHz))
//#define BAUDRATE 115200 /* 115200 - 9600 */

#define nop \
  asm volatile ("nop")

#define __set_mask_constant(mask,address) \
  asm                                     \
    ("or.b\t%0,@(r0,gbr)"                 \
     :                                    \
     : /* %0 */ "I"((char)(mask)),        \
       /* %1 */ "z"(address-GBR))

#define __clear_mask_constant(mask,address) \
  asm                                       \
    ("and.b\t%0,@(r0,gbr)"                  \
     :                                      \
     : /* %0 */ "I"((char)~(mask)),         \
       /* %1 */ "z"(address-GBR))

#define __toggle_mask_constant(mask,address) \
  asm                                        \
    ("xor.b\t%0,@(r0,gbr)"                   \
     :                                       \
     : /* %0 */ "I"((char)(mask)),           \
       /* %1 */ "z"(address-GBR))

#define __test_mask_constant(mask,address)    \
  ({                                          \
    int result;                               \
    asm                                       \
      ("tst.b\t%1,@(r0,gbr)\n\tmovt\t%0"      \
       : "=r"(result)                         \
       : "I"((char)(mask)),"z"(address-GBR)); \
    result;                                   \
  })

#define __set_bit_constant(bit,address) \
  asm                                   \
    ("or.b\t%0,@(r0,gbr)"               \
     :                                  \
     : /* %0 */ "I"((char)(1<<(bit))),  \
       /* %1 */ "z"(address-GBR))

#define __clear_bit_constant(bit,address) \
  asm                                     \
    ("and.b\t%0,@(r0,gbr)"                \
     :                                    \
     : /* %0 */ "I"((char)~(1<<(bit))),   \
       /* %1 */ "z"(address-GBR))

#define __toggle_bit_constant(bit,address) \
  asm                                      \
    ("xor.b\t%0,@(r0,gbr)"                 \
     :                                     \
     : /* %0 */ "I"((char)(1<<(bit))),     \
       /* %1 */ "z"(address-GBR))

#define __test_bit_constant(bit,address)      \
  ({                                          \
    int result;                               \
    asm                                       \
      ("tst.b\t%1,@(r0,gbr)\n\tmovt\t%0"      \
       : "=r"(result)                         \
       : "I"((char)(1<<(bit))),"z"(address-GBR)); \
    result;                                   \
  })

#define __set_mask(mask,address)      /* FIXME */
#define __test_mask(mask,address)   0 /* FIXME */
#define __clear_mask(mask,address)    /* FIXME */
#define __toggle_mask(mask,address)   /* FIXME */

#define __set_bit(bit,address)      /* FIXME */
#define __test_bit(bit,address)   0 /* FIXME */
#define __clear_bit(bit,address)    /* FIXME */
#define __toggle_bit(bit,address)   /* FIXME */

#define set_mask(mask,address)          \
  if (__builtin_constant_p (mask))      \
    __set_mask_constant (mask,address); \
  else                                  \
    __set_mask (mask,address)

#define clear_mask(mask,address)          \
  if (__builtin_constant_p (mask))        \
    __clear_mask_constant (mask,address); \
  else                                    \
    __clear_mask (mask,address)

#define toggle_mask(mask,address)          \
  if (__builtin_constant_p (mask))         \
    __toggle_mask_constant (mask,address); \
  else                                     \
    __toggle_mask (mask,address)

#define test_mask(mask,address)              \
  (                                          \
    (__builtin_constant_p (mask))            \
  ? (int)__test_mask_constant (mask,address) \
  : (int)__test_mask (mask,address)          \
  )


#define set_bit(bit,address)          \
  if (__builtin_constant_p (bit))     \
    __set_bit_constant (bit,address); \
  else                                \
    __set_bit (bit,address)

#define clear_bit(bit,address)          \
  if (__builtin_constant_p (bit))       \
    __clear_bit_constant (bit,address); \
  else                                  \
    __clear_bit (bit,address)

#define toggle_bit(bit,address)          \
  if (__builtin_constant_p (bit))        \
    __toggle_bit_constant (bit,address); \
  else                                   \
    __toggle_bit (bit,address)

#define test_bit(bit,address)              \
  (                                        \
    (__builtin_constant_p (bit))           \
  ? (int)__test_bit_constant (bit,address) \
  : (int)__test_bit (bit,address)          \
  )


extern char __swap_bit[256];

#define swap_bit(byte) \
  __swap_bit[byte]

#ifndef SIMULATOR

static inline short swabHI (short value)
  /*
    result[15..8] = value[ 7..0];
    result[ 7..0] = value[15..8];
  */    
  {
    short result;
    asm volatile ("swap.b\t%1,%0" : "=r"(result) : "r"(value));
    return result;
  }

static inline int swawSI (int value)
  /*
    result[31..16] = value[15.. 0];
    result[15.. 0] = value[31..16];
  */    
  {
    int result;
    asm volatile ("swap.w\t%1,%0" : "=r"(result) : "r"(value));
    return result;
  }

static inline int swabSI (int value) // should be avoided as much as possible
  /*
    result[31..24] = value[ 7.. 0];
    result[23..16] = value[15.. 8];
    result[15.. 8] = value[23..16];
    result[ 7.. 0] = value[31..24];
  */    
  {
    return swabHI(swawSI(swabSI(value)));
  }

/* Test And Set - UNTESTED */
static inline int tas (volatile int *pointer)
  {
    int result;
    asm volatile ("tas.b\t@%1;movt\t%0" : "=t"(result) : "r"((char *)pointer) : "memory");
    return result;
  }

static inline void sti (void)
  {
    asm volatile ("ldc\t%0,sr" : : "r"(0<<4));
  }

static inline void cli (void)
  {
    asm volatile ("ldc\t%0,sr" : : "r"(15<<4));
  }

#endif

/* Compare And Swap */
static inline int cas (volatile int *pointer,int requested_value,int new_value)
  {
    cli();
    if (*pointer == requested_value)
      {
        *pointer = new_value;
        sti ();
        return 1;
      }
    sti ();
    return 0;
  }

static inline int cas2 (volatile int *pointer1,volatile int *pointer2,int requested_value1,int requested_value2,int new_value1,int new_value2)
  {
    cli();
    if (*pointer1 == requested_value1 && *pointer2 == requested_value2)
      {
        *pointer1 = new_value1;
        *pointer2 = new_value2;
        sti ();
        return 1;
      }
    sti ();
    return 0;
  }

extern void system_reboot (void);

#endif