1 /* This file provides basic types and some constants for the 2 * SYS_DEVIO and SYS_VDEVIO system calls, which allow user-level 3 * processes to perform device I/O. 4 * 5 * Created: 6 * Apr 08, 2004 by Jorrit N. Herder 7 */ 8 9 #ifndef _DEVIO_H 10 #define _DEVIO_H 11 12 #include <minix/sys_config.h> /* needed to include <minix/type.h> */ 13 #include <sys/types.h> /* u8_t, u16_t, u32_t needed */ 14 15 typedef u16_t port_t; 16 17 /* We have different granularities of port I/O: 8, 16, 32 bits. 18 * Also see <ibm/portio.h>, which has functions for bytes, words, 19 * and longs. Hence, we need different (port,value)-pair types. 20 */ 21 typedef struct { u16_t port; u8_t value; } pvb_pair_t; 22 typedef struct { u16_t port; u16_t value; } pvw_pair_t; 23 typedef struct { u16_t port; u32_t value; } pvl_pair_t; 24 25 /* Macro shorthand to set (port,value)-pair. */ 26 #define pv_set(pv, p, v) do { \ 27 u32_t _p = (p), _v = (v); \ 28 (pv).port = _p; \ 29 (pv).value = _v; \ 30 if((pv).port != _p || (pv).value != _v) { \ 31 printf("%s:%d: actual port: 0x%x != 0x%x || " \ 32 "actual value: 0x%x != 0x%x\n", \ 33 __FILE__, __LINE__, (pv).port, _p, (pv).value, _v); \ 34 panic("pv_set(" #pv ", " #p ", " #v ")"); \ 35 } \ 36 } while(0) 37 38 #if 0 /* no longer in use !!! */ 39 /* Define a number of flags to indicate granularity we are using. */ 40 #define MASK_GRANULARITY 0x000F /* not in use! does not match flags */ 41 #define PVB_FLAG 'b' 42 #define PVW_FLAG 'w' 43 #define PVL_FLAG 'l' 44 45 /* Flags indicating whether request wants to do input or output. */ 46 #define MASK_IN_OR_OUT 0x00F0 47 #define DEVIO_INPUT 0x0010 48 #define DEVIO_OUTPUT 0x0020 49 #endif /* 0 */ 50 51 #if 0 /* no longer used !!! */ 52 /* Define how large the (port,value)-pair buffer in the kernel is. 53 * This buffer is used to copy the (port,value)-pairs in kernel space. 54 */ 55 #define PV_BUF_SIZE 64 /* creates char pv_buf[PV_BUF_SIZE] */ 56 57 /* Note that SYS_VDEVIO sends a pointer to a vector of (port,value)-pairs, 58 * whereas SYS_DEVIO includes a single (port,value)-pair in the messages. 59 * Calculate maximum number of (port,value)-pairs that can be handled 60 * in a single SYS_VDEVIO system call with above struct definitions. 61 */ 62 #define MAX_PVB_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvb_pair_t)) 63 #define MAX_PVW_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvw_pair_t)) 64 #define MAX_PVL_PAIRS ((PV_BUF_SIZE * sizeof(char)) / sizeof(pvl_pair_t)) 65 #endif /* 0 */ 66 67 68 #endif /* _DEVIO_H */ 69