qemu/pc-bios/s390-ccw/sclp.h
Philippe Mathieu-Daudé f7795e4096 misc: Replace zero-length arrays with flexible array member (automatic)
Description copied from Linux kernel commit from Gustavo A. R. Silva
(see [3]):

--v-- description start --v--

  The current codebase makes use of the zero-length array language
  extension to the C90 standard, but the preferred mechanism to
  declare variable-length types such as these ones is a flexible
  array member [1], introduced in C99:

  struct foo {
      int stuff;
      struct boo array[];
  };

  By making use of the mechanism above, we will get a compiler
  warning in case the flexible array does not occur last in the
  structure, which will help us prevent some kind of undefined
  behavior bugs from being unadvertenly introduced [2] to the
  Linux codebase from now on.

--^-- description end --^--

Do the similar housekeeping in the QEMU codebase (which uses
C99 since commit 7be41675f7).

All these instances of code were found with the help of the
following Coccinelle script:

  @@
  identifier s, m, a;
  type t, T;
  @@
   struct s {
      ...
      t m;
  -   T a[0];
  +   T a[];
  };
  @@
  identifier s, m, a;
  type t, T;
  @@
   struct s {
      ...
      t m;
  -   T a[0];
  +   T a[];
   } QEMU_PACKED;

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76497732932f
[3] https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=17642a2fbd2c1

Inspired-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-03-16 22:07:42 +01:00

110 lines
3.1 KiB
C

/*
* SCLP ASCII access driver
*
* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#ifndef SCLP_H
#define SCLP_H
/* SCLP command codes */
#define SCLP_CMDW_READ_SCP_INFO 0x00020001
#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
#define SCLP_CMD_READ_EVENT_DATA 0x00770005
#define SCLP_CMD_WRITE_EVENT_DATA 0x00760005
#define SCLP_CMD_READ_EVENT_DATA 0x00770005
#define SCLP_CMD_WRITE_EVENT_DATA 0x00760005
#define SCLP_CMD_WRITE_EVENT_MASK 0x00780005
/* SCLP response codes */
#define SCLP_RC_NORMAL_READ_COMPLETION 0x0010
#define SCLP_RC_NORMAL_COMPLETION 0x0020
#define SCLP_RC_INVALID_SCLP_COMMAND 0x01f0
#define SCLP_RC_CONTAINED_EQUIPMENT_CHECK 0x0340
#define SCLP_RC_INSUFFICIENT_SCCB_LENGTH 0x0300
#define SCLP_RC_INVALID_FUNCTION 0x40f0
#define SCLP_RC_NO_EVENT_BUFFERS_STORED 0x60f0
#define SCLP_RC_INVALID_SELECTION_MASK 0x70f0
#define SCLP_RC_INCONSISTENT_LENGTHS 0x72f0
#define SCLP_RC_EVENT_BUFFER_SYNTAX_ERROR 0x73f0
#define SCLP_RC_INVALID_MASK_LENGTH 0x74f0
/* Service Call Control Block (SCCB) and its elements */
#define SCCB_SIZE 4096
#define SCLP_VARIABLE_LENGTH_RESPONSE 0x80
#define SCLP_EVENT_BUFFER_ACCEPTED 0x80
#define SCLP_FC_NORMAL_WRITE 0
typedef struct SCCBHeader {
uint16_t length;
uint8_t function_code;
uint8_t control_mask[3];
uint16_t response_code;
} __attribute__((packed)) SCCBHeader;
#define SCCB_DATA_LEN (SCCB_SIZE - sizeof(SCCBHeader))
typedef struct ReadInfo {
SCCBHeader h;
uint16_t rnmax;
uint8_t rnsize;
uint8_t reserved[13];
uint8_t loadparm[LOADPARM_LEN];
} __attribute__((packed)) ReadInfo;
typedef struct SCCB {
SCCBHeader h;
char data[SCCB_DATA_LEN];
} __attribute__((packed)) SCCB;
/* SCLP event types */
#define SCLP_EVENT_ASCII_CONSOLE_DATA 0x1a
#define SCLP_EVENT_SIGNAL_QUIESCE 0x1d
/* SCLP event masks */
#define SCLP_EVENT_MASK_SIGNAL_QUIESCE 0x00000008
#define SCLP_EVENT_MASK_MSG_ASCII 0x00000040
#define SCLP_UNCONDITIONAL_READ 0x00
#define SCLP_SELECTIVE_READ 0x01
typedef struct WriteEventMask {
SCCBHeader h;
uint16_t _reserved;
uint16_t mask_length;
uint32_t cp_receive_mask;
uint32_t cp_send_mask;
uint32_t send_mask;
uint32_t receive_mask;
} __attribute__((packed)) WriteEventMask;
typedef struct EventBufferHeader {
uint16_t length;
uint8_t type;
uint8_t flags;
uint16_t _reserved;
} __attribute__((packed)) EventBufferHeader;
typedef struct WriteEventData {
SCCBHeader h;
EventBufferHeader ebh;
char data[];
} __attribute__((packed)) WriteEventData;
typedef struct ReadEventData {
SCCBHeader h;
EventBufferHeader ebh;
uint32_t mask;
} __attribute__((packed)) ReadEventData;
#define __pa(x) (x)
#endif /* SCLP_H */