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/*==========================================================================

//

//      syscall.c

//

//      Redboot syscall handling for GNUPro bsp support

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    msalter

// Contributors: msalter

// Date:         1999-02-20

// Purpose:      Temporary support for gnupro bsp

//

//####DESCRIPTIONEND####

//

//=========================================================================*/

#include <redboot.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/drv_api.h>

#include <cyg/hal/hal_stub.h>

#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS

#define NEWLIB_EIO 5              /* I/O error */

#define NEWLIB_ENOSYS 88          /* Syscall not supported */

/*

 * Clients of this BSP will need to have access to BSP functions and

 * data structures. Because, the client and the BSP may not be linked

 * together, a structure of vectors is used to gain this access. A

 * pointer to this structure can be gotten via a syscall. This syscall

 * is made automatically from within the crt0.o file.

 */

typedef struct {

    int         version;        /* version number for future expansion */

    const void **__ictrl_table;

    void **__exc_table;

    void *__dbg_vector;

    void *__kill_vector;

    void *__console_procs;

    void *__debug_procs;

    void (*__flush_dcache)(void *__p, int __nbytes);

    void (*__flush_icache)(void *__p, int __nbytes);

    void *__cpu_data;

    void *__board_data;

    void *__sysinfo;

    int  (*__set_debug_comm)(int __comm_id);

    int  (*__set_console_comm)(int __comm_id);

    int  (*__set_serial_baud)(int __comm_id, int baud);

    void *__dbg_data;

    void (*__reset)(void);

    int  __console_interrupt_flag;

} __shared_t;

static __shared_t __shared_data = { 2 };

// this is used by newlib's mode_t so we should match it

#ifdef __GNUC__

#define _ST_INT32 __attribute__ ((__mode__ (__SI__)))

#else

#define _ST_INT32

#endif

typedef unsigned int    newlib_mode_t _ST_INT32;

typedef short           newlib_dev_t;

typedef unsigned short  newlib_ino_t;

typedef unsigned short  newlib_nlink_t;

typedef long            newlib_off_t;

typedef unsigned short  newlib_uid_t;

typedef unsigned short  newlib_gid_t;

typedef long            newlib_time_t;

typedef long            newlib_long_t;

struct newlib_stat

{

    newlib_dev_t     st_dev;

    newlib_ino_t     st_ino;

    newlib_mode_t    st_mode;

    newlib_nlink_t   st_nlink;

    newlib_uid_t     st_uid;

    newlib_gid_t     st_gid;

    newlib_dev_t     st_rdev;

    newlib_off_t     st_size;

    // We assume we've been compiled with the same flags as newlib here

#if defined(__svr4__) && !defined(__PPC__) && !defined(__sun__)

    newlib_time_t    st_atime;

    newlib_time_t    st_mtime;

    newlib_time_t    st_ctime;

#else

    newlib_time_t    st_atime;

    newlib_long_t    st_spare1;

    newlib_time_t    st_mtime;

    newlib_long_t    st_spare2;

    newlib_time_t    st_ctime;

    newlib_long_t    st_spare3;

    newlib_long_t    st_blksize;

    newlib_long_t    st_blocks;

    newlib_long_t    st_spare4[2];

#endif

};

#define NEWLIB_S_IFCHR 0020000 // character special file

static inline char __getc(void)

{

    char c;

    hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();

    if (__chan)

        c = CYGACC_COMM_IF_GETC(*__chan);

    else {

        __chan = CYGACC_CALL_IF_DEBUG_PROCS();

        c = CYGACC_COMM_IF_GETC(*__chan);

    }

    return c;

}

static inline void __putc(char c)

{

    hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();

    if (__chan)

        CYGACC_COMM_IF_PUTC(*__chan, c);

    else {

        __chan = CYGACC_CALL_IF_DEBUG_PROCS();

        CYGACC_COMM_IF_PUTC(*__chan, c);

    }

}

static inline void __flush(void)

{

    hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();

    if (__chan == NULL)

        __chan = CYGACC_CALL_IF_DEBUG_PROCS();

    CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_FLUSH_OUTPUT);

}

// Timer support

static cyg_handle_t  sys_timer_handle;

static cyg_interrupt sys_timer_interrupt;

static cyg_uint64    sys_timer_ticks = 0;

#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

static unsigned int set_period = CYGNUM_HAL_RTC_PERIOD; // The default

typedef void *callback_func( char *pc, char *sp );

static callback_func *timer_callback = 0;

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

static void

sys_timer_dsr(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)

{

    // do nothing

}

static cyg_uint32

sys_timer_isr(cyg_vector_t vector, cyg_addrword_t data)

{

    ++sys_timer_ticks;

#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

    HAL_CLOCK_RESET(CYGNUM_HAL_INTERRUPT_RTC, set_period);

#else

    HAL_CLOCK_RESET(CYGNUM_HAL_INTERRUPT_RTC, CYGNUM_HAL_RTC_PERIOD);

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

    cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_RTC);

#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

    if ( timer_callback ) {

        char *intrpc = (char *)0;

        char *intrsp = (char *)0;

        // There may be a number of ways to get the PC and (optional) SP

        // information out of the HAL.  Hence this is conditioned.  In some

        // configurations, a register-set pointer is available as

        // (invisible) argument 3 to this ISR call.

#ifdef HAL_GET_PROFILE_INFO

        HAL_GET_PROFILE_INFO( intrpc, intrsp );

#endif // HAL_GET_PROFILE_INFO available

        CYGARC_HAL_SAVE_GP();

        timer_callback( intrpc, intrsp );

        CYGARC_HAL_RESTORE_GP();

    }

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

    return CYG_ISR_HANDLED;

}

static void sys_timer_init(void)

{

#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

    HAL_CLOCK_INITIALIZE(set_period);

#else

    HAL_CLOCK_INITIALIZE(CYGNUM_HAL_RTC_PERIOD);

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

    cyg_drv_interrupt_create(

        CYGNUM_HAL_INTERRUPT_RTC,

        0,                      // Priority - unused

        (CYG_ADDRWORD)0,        // Data item passed to ISR & DSR

        sys_timer_isr,          // ISR

        sys_timer_dsr,          // DSR

        &sys_timer_handle,      // handle to intr obj

        &sys_timer_interrupt ); // space for int obj

    cyg_drv_interrupt_attach(sys_timer_handle);

    cyg_drv_interrupt_unmask(CYGNUM_HAL_INTERRUPT_RTC);

}

//

// read  -- read bytes from the serial port. Ignore fd, since

//          we only have stdin.

static int

sys_read(int fd, char *buf, int nbytes)

{

    int i = 0;

    for (i = 0; i < nbytes; i++) {

        *(buf + i) = __getc();

        if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {

            (*(buf + i + 1)) = 0;

            break;

        }

    }

    return (i);

}

//

// write -- write bytes to the serial port. Ignore fd, since

//          stdout and stderr are the same. Since we have no filesystem,

//          open will only return an error.

//

static int

sys_write(int fd, char *buf, int nbytes)

{

#define WBUFSIZE  256

    int  tosend;

    tosend = nbytes;

    while (tosend > 0) {

        if (*buf == '\n')

            __putc('\r');

        __putc(*buf++);

        tosend--;

    }

    __flush();

    return (nbytes);

}

//

// open -- open a file descriptor. We don't have a filesystem, so

//         we return an error.

//

static int

sys_open (const char *buf, int flags, int mode)

{

    return (-NEWLIB_EIO);

}

//

// close -- We don't need to do anything, but pretend we did.

//

static int

sys_close(int fd)

{

    return (0);

}

//

// lseek --  Since a serial port is non-seekable, we return an error.

//

static int

sys_lseek(int fd,  int offset, int whence)

{

    return (-NEWLIB_EIO);

}

#define NS_PER_TICK    (CYGNUM_HAL_RTC_NUMERATOR/CYGNUM_HAL_RTC_DENOMINATOR)

#define TICKS_PER_SEC  (1000000000ULL / NS_PER_TICK)

// This needs to match newlib HZ which is normally 60.

#define HZ (60ULL)

#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

static unsigned int set_freq   = TICKS_PER_SEC; // The default

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

static int

sys_times(unsigned long *p)

{

    static int inited = 0;

    if (!inited) {

        inited = 1;

        sys_timer_init();

    }

    /* target clock runs at CLOCKS_PER_SEC. Convert to HZ */

    if (p)

#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

        *p = (sys_timer_ticks * HZ) / (cyg_uint64)set_freq;

#else

        *p = (sys_timer_ticks * HZ) / TICKS_PER_SEC;

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

    return 0;

}

#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

static void sys_profile_call_back( char *func, char **previous_call_back )

{

    if ( previous_call_back )

        *previous_call_back = (char *)timer_callback;

    timer_callback = (callback_func *)func;

    // Ensure the timer is started

    (void)sys_times( (unsigned long *)0 );

}

static void sys_profile_frequency( int freq, int *previous_freq )

{

// Requested HZ:

// 0         => tell me the current value (no change, IMPLEMENTED HERE)

// - 1       => tell me the slowest (no change)

// - 2       => tell me the default (no change, IMPLEMENTED HERE)

// -nnn      => tell me what you would choose for nnn (no change)

// MIN_INT   => tell me the fastest (no change)

//        

// 1         => tell me the slowest (sets the clock)

// MAX_INT   => tell me the fastest (sets the clock)

    // Ensure the timer is started

    (void)sys_times( (unsigned long *)0 );

    if ( -2 == freq )

        freq = TICKS_PER_SEC; // default value

    else if ( 0 == freq )

        freq = set_freq; // collect current value

    else {

        int do_set_freq = (freq > 0);

        unsigned int period = CYGNUM_HAL_RTC_PERIOD;

        if ( 0 == (freq ^ -freq) ) // Then it's MIN_INT in local size

            freq++; // just so that it will negate correctly

        // Then set the timer to that fast - or pass on the enquiry

#ifdef HAL_CLOCK_REINITIALIZE

        // Give the HAL enough info to do the division sum relative to

        // the default setup, in period and TICKS_PER_SEC.

        HAL_CLOCK_REINITIALIZE( freq, period, TICKS_PER_SEC );

#else

        freq = TICKS_PER_SEC; // the only choice

#endif

        if ( do_set_freq ) { // update the global variables

            unsigned int orig = set_freq;

            set_freq = freq;

            set_period = period;

            // We must "correct" sys_timer_ticks for the new scale factor.

            sys_timer_ticks = sys_timer_ticks * set_freq / orig;

        }

    }

    if ( previous_freq ) // Return the current value (new value)

        *previous_freq = freq;

}

void sys_profile_reset( void )

{

    timer_callback = NULL;

// Want to preserve the frequency between runs, for clever GDB users!

//    sys_profile_frequency( TICKS_PER_SEC, NULL );

}

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

//

//  Generic syscall handler.

//

//  Returns 0 if syscall number is not handled by this

//  module, 1 otherwise. This allows applications to

//  extend the syscall handler by using exception chaining.

//

CYG_ADDRWORD

__do_syscall(CYG_ADDRWORD func,                 // syscall function number

             CYG_ADDRWORD arg1, CYG_ADDRWORD arg2,      // up to four args.

             CYG_ADDRWORD arg3, CYG_ADDRWORD arg4,

             CYG_ADDRWORD *retval, CYG_ADDRWORD *sig)   // syscall return value

{

    int err = 0;

    *sig = 0;

    switch (func) {

      case SYS_open:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_open( const char *name, int flags,

                                                int mode, int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_open((const char *)arg1, (int)arg2, (int)arg3,

                                           (int *)sig);

          else

#endif

              err = sys_open((const char *)arg1, (int)arg2, (int)arg3);

          break;

      }

      case SYS_read:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_read( int fd, void *buf, size_t count,

                                                int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_read((int)arg1, (void *)arg2, (size_t)arg3,

                                           (int *)sig);

          else

#endif

              err = sys_read((int)arg1, (char *)arg2, (int)arg3);

          break;

      }

      case SYS_write:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_write( int fd, const void *buf,

                                                 size_t count, int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_write((int)arg1, (const void *)arg2,

                                            (size_t)arg3, (int *)sig);

          else

#endif

              err = sys_write((int)arg1, (char *)arg2, (int)arg3);

          break;

      }

      case SYS_close:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_close( int fd, int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_close((int)arg1, (int *)sig);

          else

#endif

              err = sys_close((int)arg1);

          break;

      }

      case SYS_lseek:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_lseek( int fd, long offset,

                                                 int whence, int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_lseek((int)arg1, (long)arg2, (int)arg3,

                                            (int *)sig);

          else

#endif

              err = sys_lseek((int)arg1, (int)arg2, (int)arg3);

          break;

      }

      case SYS_stat:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_stat( const char *pathname,

                                                void *statbuf, int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_stat((const char *)arg1, (void *)arg2,

                                           (int *)sig);

          else

#endif

              err = -NEWLIB_ENOSYS;

          break;

      }

      case SYS_fstat:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_fstat( int fd, void *statbuf,

                                                 int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_fstat((int)arg1, (void *)arg2,

                                            (int *)sig);

          else

#endif

          {

              struct newlib_stat *st = (struct newlib_stat *)arg2;

              st->st_mode = NEWLIB_S_IFCHR;

              st->st_blksize = 4096;

              err = 0;

          }

          break;

      }

      case SYS_rename:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_rename( const char *oldpath,

                                                  const char *newpath,

                                                  int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_rename((const char *)arg1, (const char *)arg2,

                                             (int *)sig);

          else

#endif

              err = -NEWLIB_ENOSYS;

          break;

      }

      case SYS_unlink:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_unlink( const char *pathname,

                                                  int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_unlink((const char *)arg1, (int *)sig);

          else

#endif

              err = -NEWLIB_ENOSYS;

          break;

      }

      case SYS_isatty:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_isatty( int fd, int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_isatty((int)arg1, (int *)sig);

          else

#endif

              err = 1;

          break;

      }

      case SYS_system:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_system( const char *command,

                                                  int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_system((const char *)arg1, (int *)sig);

          else

#endif

              err = -1;

          break;

      }

      case SYS_gettimeofday:

      {

#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol

          __externC int cyg_hal_gdbfileio_gettimeofday( void *tv, void *tz,

                                                        int *sig );

          if (gdb_active)

              err = cyg_hal_gdbfileio_gettimeofday((void *)arg1, (void *)arg2,

                                                   (int *)sig);

          else

#endif

              err = 0;

          break;

      }

      case SYS_utime:

        // FIXME. Some libglosses depend on this behavior.

        err = sys_times((unsigned long *)arg1);

        break;

      case SYS_times:

        err = sys_times((unsigned long *)arg1);

        break;

      case SYS_meminfo:

        err = 1;

        *(unsigned long *)arg1 = (unsigned long)(ram_end-ram_start);

        *(unsigned long *)arg2 = (unsigned long)ram_end;

        break;

#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

    case SYS_timer_call_back:

        sys_profile_call_back( (char *)arg1, (char **)arg2 );

        break;

    case SYS_timer_frequency:

        sys_profile_frequency( (int)arg1, (unsigned int *)arg2 );

        break;

    case SYS_timer_reset:

        sys_profile_reset();

        break;

#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF

      case __GET_SHARED:

        *(__shared_t **)arg1 = &__shared_data;

        break;

      case SYS_exit:

        if (gdb_active) {

            *sig = SIGTRAP;

            err = func;

        } else {

            CYGACC_CALL_IF_MONITOR_RETURN(arg1);

            // never returns

        }

        break;

      default:

        return 0;

    }

    *retval = err;

    return 1;

}

#endif