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} __attribute__((packed));
  49
  50struct msg_buf {
  51        struct evbuf_header header;
  52        struct mdb mdb;
  53} __attribute__((packed));
  54
  55struct write_sccb {
  56        struct sccb_header header;
  57        struct msg_buf msg_buf;
  58} __attribute__((packed));
  59
  60/* The number of empty mto buffers that can be contained in a single sccb. */
  61#define NR_EMPTY_MTO_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
  62                        sizeof(struct write_sccb)) / sizeof(struct mto))
  63
  64/*
  65 * data structure for information about list of SCCBs (only for writing),
  66 * will be located at the end of a SCCBs page
  67 */
  68struct sclp_buffer {
  69        struct list_head list;          /* list_head for sccb_info chain */
  70        struct sclp_req request;
  71        struct write_sccb *sccb;
  72        char *current_line;
  73        int current_length;
  74        int retry_count;
  75        /* output format settings */
  76        unsigned short columns;
  77        unsigned short htab;
  78        /* statistics about this buffer */
  79        unsigned int mto_char_sum;      /* # chars in sccb */
  80        unsigned int mto_number;        /* # mtos in sccb */
  81        /* Callback that is called after reaching final status. */
  82        void (*callback)(struct sclp_buffer *, int);
  83};
  84
  85int sclp_rw_init(void);
  86struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
  87void *sclp_unmake_buffer(struct sclp_buffer *);
  88int sclp_buffer_space(struct sclp_buffer *);
  89int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
  90int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
  91void sclp_set_columns(struct sclp_buffer *, unsigned short);
  92void sclp_set_htab(struct sclp_buffer *, unsigned short);
  93int sclp_chars_in_buffer(struct sclp_buffer *);
  94
  95#ifdef CONFIG_SCLP_CONSOLE
  96void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event);
  97#else
  98static inline void sclp_console_pm_event(enum sclp_pm_event sclp_pm_event) { }
  99#endif
 100
 101#endif  /* __SCLP_RW_H__ */
 102