LXR linux/drivers/s390/char/sclp

   1/*
   2 *  drivers/s390/char/sclp_rw.h
   3 *    interface to the SCLP-read/write driver
   4 *
   5 *  S390 version
   6 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7 *    Author(s): Martin Peschke <mpeschke@de.ibm.com>
   8 *               Martin Schwidefsky <schwidefsky@de.ibm.com>
   9 */
  10
  11#ifndef __SCLP_RW_H__
  12#define __SCLP_RW_H__
  13
  14#include <linux/list.h>
  15
  16struct mto {
  17        u16 length;
  18        u16 type;
  19        u16 line_type_flags;
  20        u8  alarm_control;
  21        u8  _reserved[3];
  22} __attribute__((packed));
  23
  24struct go {
  25        u16 length;
  26        u16 type;
  27        u32 domid;
  28        u8  hhmmss_time[8];
  29        u8  th_time[3];
  30        u8  reserved_0;
  31        u8  dddyyyy_date[7];
  32        u8  _reserved_1;
  33        u16 general_msg_flags;
  34        u8  _reserved_2[10];
  35        u8  originating_system_name[8];
  36        u8  job_guest_name[8];
  37} __attribute__((packed));
  38
  39struct mdb_header {
  40        u16 length;
  41        u16 type;
  42        u32 tag;
  43        u32 revision_code;
  44} __attribute__((packed));
  45
  46struct mdb {
  47        struct mdb_header header;
  48        struct go go;
  49} __attribute__((packed));
  50
  51struct msg_buf {
  52        struct evbuf_header header;
  53        struct mdb mdb;
  54} __attribute__((packed));
  55
  56struct write_sccb {
  57        struct sccb_header header;
  58        struct msg_buf msg_buf;
  59} __attribute__((packed));
  60
  61/* The number of empty mto buffers that can be contained in a single sccb. */
  62#define NR_EMPTY_MTO_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
  63                        sizeof(struct write_sccb)) / sizeof(struct mto))
  64
  65/*
  66 * data structure for information about list of SCCBs (only for writing),
  67 * will be located at the end of a SCCBs page
  68 */
  69struct sclp_buffer {
  70        struct list_head list;          /* list_head for sccb_info chain */
  71        struct sclp_req request;
  72        struct write_sccb *sccb;
  73        char *current_line;
  74        int current_length;
  75        int retry_count;
  76        /* output format settings */
  77        unsigned short columns;
  78        unsigned short htab;
  79        /* statistics about this buffer */
  80        unsigned int mto_char_sum;      /* # chars in sccb */
  81        unsigned int mto_number;        /* # mtos in sccb */
  82        /* Callback that is called after reaching final status. */
  83        void (*callback)(struct sclp_buffer *, int);
  84};
  85
  86int sclp_rw_init(void);
  87struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
  88void *sclp_unmake_buffer(struct sclp_buffer *);
  89int sclp_buffer_space(struct sclp_buffer *);
  90int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
  91int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
  92void sclp_set_columns(struct sclp_buffer *, unsigned short);
  93void sclp_set_htab(struct sclp_buffer *, unsigned short);
  94int sclp_chars_in_buffer(struct sclp_buffer *);
  95
  96#endif  /* __SCLP_RW_H__ */
  97