arch/powerpc/include/asm/hvconsole.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * hvconsole.h
   4  * Copyright (C) 2004 Ryan S Arnold, IBM Corporation
   5  *
   6  * LPAR console support.
   7  */
   8
   9 #ifndef _PPC64_HVCONSOLE_H
  10 #define _PPC64_HVCONSOLE_H
  11 #ifdef __KERNEL__
  12
  13 /*
  14  * PSeries firmware will only send/recv up to 16 bytes of character data per
  15  * hcall.
  16  */
  17 #define MAX_VIO_PUT_CHARS       16
  18 #define SIZE_VIO_GET_CHARS      16
  19
  20 /*
  21  * Vio firmware always attempts to fetch MAX_VIO_GET_CHARS chars.  The 'count'
  22  * parm is included to conform to put_chars() function pointer template
  23  */
  24 extern int hvc_get_chars(uint32_t vtermno, char *buf, int count);
  25 extern int hvc_put_chars(uint32_t vtermno, const char *buf, int count);
  26
  27 /* Provided by HVC VIO */
  28 void hvc_vio_init_early(void);
  29
  30 #endif /* __KERNEL__ */
  31 #endif /* _PPC64_HVCONSOLE_H */