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-rw-r--r--drivers/s390/char/sclp_rw.h91
1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_rw.h b/drivers/s390/char/sclp_rw.h
new file mode 100644
index 000000000..9b779ee4f
--- /dev/null
+++ b/drivers/s390/char/sclp_rw.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * interface to the SCLP-read/write driver
+ *
+ * Copyright IBM Corporation 1999, 2009
+ *
+ * Author(s): Martin Peschke <mpeschke@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#ifndef __SCLP_RW_H__
+#define __SCLP_RW_H__
+
+#include <linux/list.h>
+
+struct mto {
+ u16 length;
+ u16 type;
+ u16 line_type_flags;
+ u8 alarm_control;
+ u8 _reserved[3];
+} __attribute__((packed));
+
+struct go {
+ u16 length;
+ u16 type;
+ u32 domid;
+ u8 hhmmss_time[8];
+ u8 th_time[3];
+ u8 reserved_0;
+ u8 dddyyyy_date[7];
+ u8 _reserved_1;
+ u16 general_msg_flags;
+ u8 _reserved_2[10];
+ u8 originating_system_name[8];
+ u8 job_guest_name[8];
+} __attribute__((packed));
+
+struct mdb_header {
+ u16 length;
+ u16 type;
+ u32 tag;
+ u32 revision_code;
+} __attribute__((packed));
+
+struct mdb {
+ struct mdb_header header;
+ struct go go;
+ struct mto mto;
+} __attribute__((packed));
+
+struct msg_buf {
+ struct evbuf_header header;
+ struct mdb mdb;
+} __attribute__((packed));
+
+/* The number of empty mto buffers that can be contained in a single sccb. */
+#define NR_EMPTY_MSG_PER_SCCB ((PAGE_SIZE - sizeof(struct sclp_buffer) - \
+ sizeof(struct sccb_header)) / sizeof(struct msg_buf))
+
+/*
+ * data structure for information about list of SCCBs (only for writing),
+ * will be located at the end of a SCCBs page
+ */
+struct sclp_buffer {
+ struct list_head list; /* list_head for sccb_info chain */
+ struct sclp_req request;
+ void *sccb;
+ struct msg_buf *current_msg;
+ char *current_line;
+ int current_length;
+ int retry_count;
+ /* output format settings */
+ unsigned short columns;
+ unsigned short htab;
+ /* statistics about this buffer */
+ unsigned int char_sum; /* # chars in sccb */
+ unsigned int messages; /* # messages in sccb */
+ /* Callback that is called after reaching final status. */
+ void (*callback)(struct sclp_buffer *, int);
+};
+
+int sclp_rw_init(void);
+struct sclp_buffer *sclp_make_buffer(void *, unsigned short, unsigned short);
+void *sclp_unmake_buffer(struct sclp_buffer *);
+int sclp_buffer_space(struct sclp_buffer *);
+int sclp_write(struct sclp_buffer *buffer, const unsigned char *, int);
+int sclp_emit_buffer(struct sclp_buffer *,void (*)(struct sclp_buffer *,int));
+unsigned int sclp_chars_in_buffer(struct sclp_buffer *);
+
+#endif /* __SCLP_RW_H__ */