drivers/s390/char/sclp_rw.h

   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
  16 struct mto {
  17         u16 length;
  18         u16 type;
  19         u16 line_type_flags;
  20         u8  alarm_control;
  21         u8  _reserved[3];
  22 } __attribute__((packed));
  23
  24 struct 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
  39 struct mdb_header {
  40         u16 length;
  41         u16 type;
  42         u32 tag;
  43         u32 revision_code;
  44 } __attribute__((packed));
  45
  46 struct mdb {
  47         struct mdb_header header;
  48         struct go go;
  49 } __attribute__((packed));
  50
  51 struct msg_buf {
  52         struct evbuf_header header;
  53         struct mdb mdb;
  54 } __attribute__((packed));
  55
  56 struct 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  */
  69 struct 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
  86 int sclp_rw_init(void);
  87 struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
  88 void *sclp_unmake_buffer(struct sclp_buffer *);
  89 int sclp_buffer_space(struct sclp_buffer *);
  90 int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
  91 int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
  92 void sclp_set_columns(struct sclp_buffer *, unsigned short);
  93 void sclp_set_htab(struct sclp_buffer *, unsigned short);
  94 int sclp_chars_in_buffer(struct sclp_buffer *);
  95
  96 #endif  /* __SCLP_RW_H__ */