hypervisor/arch/x86/include/asm/jailhouse_hypercall.h

   1 /*
   2  * Jailhouse, a Linux-based partitioning hypervisor
   3  *
   4  * Copyright (c) Siemens AG, 2013
   5  *
   6  * Authors:
   7  *  Jan Kiszka <jan.kiszka@siemens.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  */
  12
  13 #ifndef __x86_64__
  14 #error 64-bit kernel required!
  15 #endif
  16
  17 #define JAILHOUSE_BASE          0xfffffffff0000000
  18
  19 #define JAILHOUSE_CALL_INS      "vmcall"
  20 #define JAILHOUSE_CALL_RESULT   "=a" (result)
  21 #define JAILHOUSE_CALL_NUM      "a" (num)
  22 #define JAILHOUSE_CALL_ARG      "D" (arg)
  23
  24 #ifndef __ASSEMBLY__
  25
  26 static inline __u32 jailhouse_call(__u32 num)
  27 {
  28         __u32 result;
  29
  30         asm volatile(JAILHOUSE_CALL_INS
  31                 : JAILHOUSE_CALL_RESULT
  32                 : JAILHOUSE_CALL_NUM
  33                 : "memory");
  34         return result;
  35 }
  36
  37 static inline __u32 jailhouse_call_arg(__u32 num, __u32 arg)
  38 {
  39         __u32 result;
  40
  41         asm volatile(JAILHOUSE_CALL_INS
  42                 : JAILHOUSE_CALL_RESULT
  43                 : JAILHOUSE_CALL_NUM, JAILHOUSE_CALL_ARG
  44                 : "memory");
  45         return result;
  46 }
  47
  48 static inline void
  49 jailhouse_send_msg_to_cell(struct jailhouse_comm_region *comm_region,
  50                            __u32 msg)
  51 {
  52         comm_region->reply_from_cell = JAILHOUSE_MSG_NONE;
  53         /* ensure reply was cleared before sending new message */
  54         asm volatile("mfence" : : : "memory");
  55         comm_region->msg_to_cell = msg;
  56 }
  57
  58 static inline void
  59 jailhouse_send_reply_from_cell(struct jailhouse_comm_region *comm_region,
  60                                __u32 reply)
  61 {
  62         comm_region->msg_to_cell = JAILHOUSE_MSG_NONE;
  63         /* ensure message was cleared before sending reply */
  64         asm volatile("mfence" : : : "memory");
  65         comm_region->reply_from_cell = reply;
  66 }
  67
  68 #endif /* !__ASSEMBLY__ */