hal_io.h

eCos操作系统源码

#define CYG_HAL_SYS__SIGMASK(_d_)       ((unsigned long)1 << ((_d_) % CYG_HAL_SYS__SIGBITS))

typedef struct cyg_hal_sys_sigset_t {
    unsigned long hal_sig_bits[CYG_HAL_SYS__NSIG / CYG_HAL_SYS__SIGBITS];
} cyg_hal_sys_sigset_t;

#define CYG_HAL_SYS_SIGFILLSET(_set_)                                                   \
    CYG_MACRO_START                                                                     \
        unsigned int __i;                                                               \
        for (__i = 0; __i < (CYG_HAL_SYS__NSIG / CYG_HAL_SYS__SIGBITS); __i++) {        \
            (_set_)->hal_sig_bits[__i] = ~0;                                            \
        }                                                                               \
    CYG_MACRO_END

#define CYG_HAL_SYS_SIGEMPTYSET(_set_)                                                  \
    CYG_MACRO_START                                                                     \
        unsigned int __i;                                                               \
        for (__i = 0; __i < (CYG_HAL_SYS__NSIG / CYG_HAL_SYS__SIGBITS); __i++) {        \
            (_set_)->hal_sig_bits[__i] = 0;                                             \
        }                                                                               \
    CYG_MACRO_END

#define CYG_HAL_SYS_SIGADDSET(_set_, _bit_)                                                     \
    CYG_MACRO_START                                                                             \
    (_set_)->hal_sig_bits[CYG_HAL_SYS__SIGELT(_bit_ - 1)] |= CYG_HAL_SYS__SIGMASK(_bit_ - 1);   \
    CYG_MACRO_END

#define CYG_HAL_SYS_SIGDELSET(_set_, _bit_)                                                     \
    CYG_MACRO_START                                                                             \
    (_set_)->hal_sig_bits[CYG_HAL_SYS__SIGELT(_bit_ - 1)] &= ~CYG_HAL_SYS__SIGMASK(_bit_ - 1);  \
    CYG_MACRO_END
               
#define CYG_HAL_SYS_SIGISMEMBER(_set_, _bit_)                                                   \
    (0 != ((_set_)->hal_sig_bits[CYG_HAL_SYS__SIGELT(_bit_ - 1)] & CYG_HAL_SYS__SIGMASK(_bit_ - 1)))

struct cyg_hal_sys_sigaction {
    void        (*hal_handler)(int);
    long        hal_mask;
    int         hal_flags;
    void        (*hal_bogus)(int);
};

// Time support.
struct cyg_hal_sys_timeval {
    long        hal_tv_sec;
    long        hal_tv_usec;
};

struct cyg_hal_sys_timezone {
    int         hal_tz_minuteswest;
    int         hal_tz_dsttime;
};

// Select support. Initially this is used only by the idle handler.
#define CYG_HAL_SYS_FD_SETSIZE          1024
#define CYG_HAL_SYS__NFDBITS            (8 * sizeof(unsigned long))
#define CYG_HAL_SYS__FDELT(_d_)         ((_d_) / CYG_HAL_SYS__NFDBITS)
#define CYG_HAL_SYS__FDMASK(_d_)        ((unsigned long)1 << ((_d_) % CYG_HAL_SYS__NFDBITS))

struct cyg_hal_sys_fd_set {
    unsigned long hal_fds_bits[CYG_HAL_SYS_FD_SETSIZE / CYG_HAL_SYS__NFDBITS];
};
#define CYG_HAL_SYS_FD_ZERO(_fdsp_)                                     \
    do {                                                                \
        unsigned int __i;                                               \
        for (__i = 0;                                                   \
             __i < (CYG_HAL_SYS_FD_SETSIZE / CYG_HAL_SYS__NFDBITS);     \
             __i++) {                                                   \
           (_fdsp_)->hal_fds_bits[__i] = 0;                             \
     } while (0);
    
#define CYG_HAL_SYS_FD_SET(_fd_, _fdsp_)                                \
    CYG_MACRO_START                                                     \
    (_fdsp_)->hal_fds_bits[CYG_HAL_SYS__FDELT(_fd_)] |= CYG_HAL_SYS__FDMASK(_fd_); \
    CYG_MACRO_END
    
#define CYG_HAL_SYS_FD_CLR(_fd_, _fdsp_)                                \
    CYG_MACRO_START                                                     \
    (_fdsp_)->hal_fds_bits[CYG_HAL_SYS__FDELT(_fd_)] &= ~CYG_HAL_SYS__FDMASK(_fd_); \
    CYG_MACRO_END

#define CYG_HAL_SYS_FD_ISSET(_fd_, _fdsp_) \
    (0 != ((_fdsp_)->hal_fds_bits[CYG_HAL_SYS__FDELT(_fd_)] & CYG_HAL_SYS__FDMASK(_fd_)))

// Interval timer support, needed for the clock.
#define CYG_HAL_SYS_ITIMER_REAL     0
#define CYG_HAL_SYS_ITIMER_VIRTUAL  1
#define CYG_HAL_SYS_ITIMER_PROF     2
 
struct cyg_hal_sys_itimerval {
    struct cyg_hal_sys_timeval  hal_it_interval;
    struct cyg_hal_sys_timeval  hal_it_value;
};

// System calls and related constants, or rather the subset that is
// needed internally.
#define CYG_HAL_SYS_R_OK    0x04
#define CYG_HAL_SYS_W_OK    0x02
#define CYG_HAL_SYS_X_OK    0x01
#define CYG_HAL_SYS_F_OK    0x00

/* lseek whence flags */
#define CYG_HAL_SYS_SEEK_SET        0       /* Seek from beginning of file.  */
#define CYG_HAL_SYS_SEEK_CUR        1       /* Seek from current position.  */
#define CYG_HAL_SYS_SEEK_END        2       /* Seek from end of file.  */

/* open/fcntl flags */

#define CYG_HAL_SYS_O_RDONLY        0
#define CYG_HAL_SYS_O_WRONLY        1
#define CYG_HAL_SYS_O_RDWR          2
#define CYG_HAL_SYS_O_CREAT       100
#define CYG_HAL_SYS_O_EXCL        200
#define CYG_HAL_SYS_O_NOCTTY      400
#define CYG_HAL_SYS_O_TRUNC      1000
#define CYG_HAL_SYS_O_APPEND     2000
#define CYG_HAL_SYS_O_NONBLOCK   4000
#define CYG_HAL_SYS_O_NDELAY     CYG_HAL_SYS_O_NONBLOCK
#define CYG_HAL_SYS_O_SYNC      10000
#define CYG_HAL_SYS_O_FSYNC     CYG_HAL_SYS_O_SYNC
#define CYG_HAL_SYS_O_ASYNC     20000

/* open mode flags */
#define CYG_HAL_SYS_S_IRUSR 400
#define CYG_HAL_SYS_S_IREAD CYG_HAL_SYS_S_IRUSR
#define CYG_HAL_SYS_S_IWUSR 200
#define CYG_HAL_SYS_S_IWRITE CYG_HAL_SYS_S_IWUSR
#define CYG_HAL_SYS_S_IXUSR 100
#define CYG_HAL_SYS_S_IEXEC CYG_HAL_SYS_S_IXUSR
#define CYG_HAL_SYS_S_IRWXU \
  (CYG_HAL_SYS_S_IREAD|CYG_HAL_SYS_S_IWRITE|CYG_HAL_SYS_S_IEXEC)
#define CYG_HAL_SYS_S_IRWXG (CYG_HAL_SYS_S_IRWXU>>3)
#define CYG_HAL_SYS_S_IRGRP (CYG_HAL_SYS_S_IRUSR>>3)
#define CYG_HAL_SYS_S_IWGRP (CYG_HAL_SYS_S_IWUSR>>3)
#define CYG_HAL_SYS_S_IXGRP (CYG_HAL_SYS_S_IXUSR>>3)
#define CYG_HAL_SYS_S_IRWXO (CYG_HAL_SYS_S_IRWXG>>3)
#define CYG_HAL_SYS_S_IROTH (CYG_HAL_SYS_S_IRGRP>>3)
#define CYG_HAL_SYS_S_IWOTH (CYG_HAL_SYS_S_IWGRP>>3)
#define CYG_HAL_SYS_S_IXOTH (CYG_HAL_SYS_S_IXGRP>>3)

struct cyg_hal_sys_mmap_args {
        unsigned long addr;
        unsigned long len;
        unsigned long prot;
        unsigned long flags;
        unsigned long fd;
        unsigned long offset;
};

/* Protection flags for mmap */
#define CYG_HAL_SYS_PROT_READ       0x1     /* page can be read */
#define CYG_HAL_SYS_PROT_WRITE      0x2     /* page can be written */
#define CYG_HAL_SYS_PROT_EXEC       0x4     /* page can be executed */
#define CYG_HAL_SYS_PROT_NONE       0x0     /* page can not be accessed */

/* Sharing types and other flags */
#define CYG_HAL_SYS_MAP_SHARED      0x01     /* Share changes.  */
#define CYG_HAL_SYS_MAP_PRIVATE     0x02     /* Changes are private.  */
#define CYG_HAL_SYS_MAP_FIXED       0x10     /* Interpret addr exactly.  */
 
// System calls, or rather the subset that is needed internally.
externC unsigned long   cyg_hal_sys_write(int, const void*, long);
externC unsigned long   cyg_hal_sys_read(int, void*, long);
externC int             cyg_hal_sys_lseek(int, int, int);
externC int             cyg_hal_sys_open(const char *,int,int); 
externC int             cyg_hal_sys_fdatasync(int); 
externC int             cyg_hal_sys_sigaction(int, 
                                              const struct cyg_hal_sys_sigaction*,
                                              struct cyg_hal_sys_sigaction*);
externC int             cyg_hal_sys_sigprocmask(int,
                                                const cyg_hal_sys_sigset_t*,
                                                cyg_hal_sys_sigset_t*);
externC int             cyg_hal_sys__newselect(int,
                                               struct cyg_hal_sys_fd_set*,
                                               struct cyg_hal_sys_fd_set*,
                                               struct cyg_hal_sys_fd_set*,
                                               struct cyg_hal_sys_timeval*);
externC int             cyg_hal_sys_setitimer(int,
                                              const struct cyg_hal_sys_itimerval*,
                                              struct cyg_hal_sys_itimerval*);
externC int             cyg_hal_sys_gettimeofday(struct cyg_hal_sys_timeval*,
                                                 struct cyg_hal_sys_timezone*);

externC int             cyg_hal_sys_access(const char*, int);
externC int             cyg_hal_sys_fork(void);
externC int             cyg_hal_sys_execve(const char*, const char* [], const char* []);
externC int             cyg_hal_sys_pipe(int []);
externC int             cyg_hal_sys_close(int);
externC int             cyg_hal_sys_dup2(int, int);
 
// The actual implementation appears to return the new brk() value.
externC void*           cyg_hal_sys_brk(void*);

// Returns the number of characters placed in the buffer or <0 for error,
// not a char*. 
externC int             cyg_hal_sys_getcwd(char*, int);

// mmap on the "host" system - this may be unportable.
externC int             cyg_hal_sys_mmap(struct cyg_hal_sys_mmap_args *);

// Access to environmental data
extern int              cyg_hal_sys_argc;
extern const char**     cyg_hal_sys_argv;
extern const char**     cyg_hal_sys_environ;

// ----------------------------------------------------------------------------
// Interaction between the application and the auxiliary.

// Is the  auxiliary actually in use/available? This flag should be tested by
// device drivers prior to attempting any communication with the auxiliary.
extern cyg_bool synth_auxiliary_running;
 
// The fundamental I/O operation: sending a request to the auxiliary and
// optionally getting back a reply. A null pointer for the response field
// indicates that no reply is expected. 
externC void synth_auxiliary_xchgmsg(int /* devid */, int /* request */,
                                     int /* arg1  */, int /* arg2 */,
                                     const unsigned char* /* txdata */, int /* txlen */,
                                     int* /* response */,
                                     unsigned char* /* rxdata */,  int* /* actual_rxlen */,
                                     int /* rxlen */);

// Request that the auxiliary instantiates a given device, loading appropriate
// support code as required. This function takes the following arguments:
// 1) the location of the package that should provide this device, e.g.
//    devs/eth/synth
// 2) the version of that package currently being used, e.g. "current"
// 3) the name of the device, e.g. "ethernet". This identifies the
//    Tcl script that should be loaded to handle requests for this device.
// 4) the name of the device instance, e.g. "eth0".
// 5) device-specific initialization data. 
externC int  synth_auxiliary_instantiate(const char*, const char*, const char*, const char*, const char*);

// Support for generating strings
#define SYNTH_MAKESTRING1(a) #a
#define SYNTH_MAKESTRING(a)  SYNTH_MAKESTRING1(a)
 
//-----------------------------------------------------------------------------
#endif // ifndef CYGONCE_HAL_HAL_IO_H
// End of hal_io.h