LCOM1920-T02G10

/* This file provides basic types and some constants for the 

 * SYS_DEVIO and SYS_VDEVIO system calls, which allow user-level 

 * processes to perform device I/O. 

 *

 * Created: 

 *        Apr 08, 2004 by Jorrit N. Herder

 */

#ifndef _DEVIO_H

#define _DEVIO_H

#include <minix/sys_config.h>     /* needed to include <minix/type.h> */

#include <sys/types.h>        /* u8_t, u16_t, u32_t needed */

typedef u16_t port_t;

/* We have different granularities of port I/O: 8, 16, 32 bits.

 * Also see <ibm/portio.h>, which has functions for bytes, words,  

 * and longs. Hence, we need different (port,value)-pair types. 

 */

typedef struct { u16_t port;  u8_t value; } pvb_pair_t;

typedef struct { u16_t port; u16_t value; } pvw_pair_t;

typedef struct { u16_t port; u32_t value; } pvl_pair_t;

/* Macro shorthand to set (port,value)-pair. */

#define pv_set(pv, p, v) do {                                        \

        u32_t _p = (p), _v = (v);                                \

        (pv).port = _p;                                                \

        (pv).value = _v;                                        \

        if((pv).port != _p || (pv).value != _v) {                \

                printf("%s:%d: actual port: 0x%x != 0x%x || "        \

                        "actual value: 0x%x != 0x%x\n",        \

                        __FILE__, __LINE__, (pv).port, _p, (pv).value, _v); \

                panic("pv_set(" #pv ", " #p ", " #v ")"); \

        }                                                        \

} while(0)

#if 0        /* no longer in use !!! */

/* Define a number of flags to indicate granularity we are using. */

#define MASK_GRANULARITY 0x000F  /* not in use! does not match flags */

#define PVB_FLAG 'b'

#define PVW_FLAG 'w'

#define PVL_FLAG 'l'

/* Flags indicating whether request wants to do input or output. */

#define MASK_IN_OR_OUT 0x00F0

#define DEVIO_INPUT 0x0010

#define DEVIO_OUTPUT 0x0020

#endif        /* 0 */

#if 0        /* no longer used !!! */

/* Define how large the (port,value)-pair buffer in the kernel is. 

 * This buffer is used to copy the (port,value)-pairs in kernel space.

 */

#define PV_BUF_SIZE  64      /* creates char pv_buf[PV_BUF_SIZE] */

/* Note that SYS_VDEVIO sends a pointer to a vector of (port,value)-pairs, 

 * whereas SYS_DEVIO includes a single (port,value)-pair in the messages.

 * Calculate maximum number of (port,value)-pairs that can be handled 

 * in a single SYS_VDEVIO system call with above struct definitions. 

 */

#define MAX_PVB_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvb_pair_t))

#define MAX_PVW_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvw_pair_t))

#define MAX_PVL_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvl_pair_t))

#endif /* 0 */

#endif  /* _DEVIO_H */