[9] | 1 | /* This file provides basic types and some constants for the
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| 2 | * SYS_DEVIO and SYS_VDEVIO system calls, which allow user-level
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| 3 | * processes to perform device I/O.
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| 4 | *
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| 5 | * Created:
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| 6 | * Apr 08, 2004 by Jorrit N. Herder
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| 7 | */
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| 8 |
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| 9 | #ifndef _DEVIO_H
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| 10 | #define _DEVIO_H
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| 11 |
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| 12 | #include <minix/sys_config.h> /* needed to include <minix/type.h> */
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| 13 | #include <sys/types.h> /* u8_t, u16_t, u32_t needed */
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| 14 |
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| 15 | typedef u16_t port_t;
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| 16 | typedef U16_t Port_t;
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| 17 |
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| 18 | /* We have different granularities of port I/O: 8, 16, 32 bits.
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| 19 | * Also see <ibm/portio.h>, which has functions for bytes, words,
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| 20 | * and longs. Hence, we need different (port,value)-pair types.
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| 21 | */
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| 22 | typedef struct { u16_t port; u8_t value; } pvb_pair_t;
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| 23 | typedef struct { u16_t port; u16_t value; } pvw_pair_t;
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| 24 | typedef struct { u16_t port; u32_t value; } pvl_pair_t;
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| 25 |
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| 26 | /* Macro shorthand to set (port,value)-pair. */
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| 27 | #define pv_set(pv, p, v) ((pv).port = (p), (pv).value = (v))
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| 28 | #define pv_ptr_set(pv_ptr, p, v) ((pv_ptr)->port = (p), (pv_ptr)->value = (v))
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| 29 |
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| 30 | #if 0 /* no longer in use !!! */
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| 31 | /* Define a number of flags to indicate granularity we are using. */
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| 32 | #define MASK_GRANULARITY 0x000F /* not in use! does not match flags */
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| 33 | #define PVB_FLAG 'b'
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| 34 | #define PVW_FLAG 'w'
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| 35 | #define PVL_FLAG 'l'
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| 36 |
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| 37 | /* Flags indicating whether request wants to do input or output. */
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| 38 | #define MASK_IN_OR_OUT 0x00F0
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| 39 | #define DEVIO_INPUT 0x0010
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| 40 | #define DEVIO_OUTPUT 0x0020
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| 41 | #endif /* 0 */
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| 42 |
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| 43 | #if 0 /* no longer used !!! */
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| 44 | /* Define how large the (port,value)-pair buffer in the kernel is.
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| 45 | * This buffer is used to copy the (port,value)-pairs in kernel space.
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| 46 | */
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| 47 | #define PV_BUF_SIZE 64 /* creates char pv_buf[PV_BUF_SIZE] */
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| 48 |
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| 49 | /* Note that SYS_VDEVIO sends a pointer to a vector of (port,value)-pairs,
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| 50 | * whereas SYS_DEVIO includes a single (port,value)-pair in the messages.
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| 51 | * Calculate maximum number of (port,value)-pairs that can be handled
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| 52 | * in a single SYS_VDEVIO system call with above struct definitions.
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| 53 | */
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| 54 | #define MAX_PVB_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvb_pair_t))
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| 55 | #define MAX_PVW_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvw_pair_t))
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| 56 | #define MAX_PVL_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvl_pair_t))
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| 57 | #endif /* 0 */
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| 58 |
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| 59 |
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| 60 | #endif /* _DEVIO_H */
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