LXR linux/drivers/s390/char/sclp

   1/*
   2 * interface to the SCLP-read/write driver
   3 *
   4 * Copyright IBM Corporation 1999, 2009
   5 *
   6 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
   7 *            Martin Schwidefsky <schwidefsky@de.ibm.com>
   8 */
   9
  10#ifndef __SCLP_RW_H__
  11#define __SCLP_RW_H__
  12
  13#include <linux/list.h>
  14
  15struct mto {
  16        u16 length;
  17        u16 type;
  18        u16 line_type_flags;
  19        u8  alarm_control;
  20        u8  _reserved[3];
  21} __attribute__((packed));
  22
  23struct go {
  24        u16 length;
  25        u16 type;
  26        u32 domid;
  27        u8  hhmmss_time[8];
  28        u8  th_time[3];
  29        u8  reserved_0;
  30        u8  dddyyyy_date[7];
  31        u8  _reserved_1;
  32        u16 general_msg_flags;
  33        u8  _reserved_2[10];
  34        u8  originating_system_name[8];
  35        u8  job_guest_name[8];
  36} __attribute__((packed));
  37
  38struct mdb_header {
  39        u16 length;
  40        u16 type;
  41        u32 tag;
  42        u32 revision_code;
  43} __attribute__((packed));
  44
  45struct mdb {
  46        struct mdb_header header;
  47        struct go go;
  48        struct mto mto;
  49} __attribute__((packed));
  50
  51struct msg_buf {
  52        struct evbuf_header header;
  53        struct mdb mdb;
  54} __attribute__((packed));
  55
  56/* The number of empty mto buffers that can be contained in a single sccb. */
  57#define NR_EMPTY_MSG_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
  58                        sizeof(struct sccb_header)) / sizeof(struct msg_buf))
  59
  60/*
  61 * data structure for information about list of SCCBs (only for writing),
  62 * will be located at the end of a SCCBs page
  63 */
  64struct sclp_buffer {
  65        struct list_head list;          /* list_head for sccb_info chain */
  66        struct sclp_req request;
  67        void *sccb;
  68        struct msg_buf *current_msg;
  69        char *current_line;
  70        int current_length;
  71        int retry_count;
  72        /* output format settings */
  73        unsigned short columns;
  74        unsigned short htab;
  75        /* statistics about this buffer */
  76        unsigned int char_sum;          /* # chars in sccb */
  77        unsigned int messages;          /* # messages in sccb */
  78        /* Callback that is called after reaching final status. */
  79        void (*callback)(struct sclp_buffer *, int);
  80};
  81
  82int sclp_rw_init(void);
  83struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
  84void *sclp_unmake_buffer(struct sclp_buffer *);
  85int sclp_buffer_space(struct sclp_buffer *);
  86int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
  87int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
  88void sclp_set_columns(struct sclp_buffer *, unsigned short);
  89void sclp_set_htab(struct sclp_buffer *, unsigned short);
  90int sclp_chars_in_buffer(struct sclp_buffer *);
  91
  92#ifdef CONFIG_SCLP_CONSOLE
  93void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event);
  94#else
  95static inline void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event) { }
  96#endif
  97
  98#endif  /* __SCLP_RW_H__ */
  99