arch/mips/include/asm/kvm_para.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_MIPS_KVM_PARA_H
   3 #define _ASM_MIPS_KVM_PARA_H
   4
   5 #include <uapi/asm/kvm_para.h>
   6
   7 #define KVM_HYPERCALL ".word 0x42000028"
   8
   9 /*
  10  * Hypercalls for KVM.
  11  *
  12  * Hypercall number is passed in v0.
  13  * Return value will be placed in v0.
  14  * Up to 3 arguments are passed in a0, a1, and a2.
  15  */
  16 static inline unsigned long kvm_hypercall0(unsigned long num)
  17 {
  18         register unsigned long n asm("v0");
  19         register unsigned long r asm("v0");
  20
  21         n = num;
  22         __asm__ __volatile__(
  23                 KVM_HYPERCALL
  24                 : "=r" (r) : "r" (n) : "memory"
  25                 );
  26
  27         return r;
  28 }
  29
  30 static inline unsigned long kvm_hypercall1(unsigned long num,
  31                                         unsigned long arg0)
  32 {
  33         register unsigned long n asm("v0");
  34         register unsigned long r asm("v0");
  35         register unsigned long a0 asm("a0");
  36
  37         n = num;
  38         a0 = arg0;
  39         __asm__ __volatile__(
  40                 KVM_HYPERCALL
  41                 : "=r" (r) : "r" (n), "r" (a0) : "memory"
  42                 );
  43
  44         return r;
  45 }
  46
  47 static inline unsigned long kvm_hypercall2(unsigned long num,
  48                                         unsigned long arg0, unsigned long arg1)
  49 {
  50         register unsigned long n asm("v0");
  51         register unsigned long r asm("v0");
  52         register unsigned long a0 asm("a0");
  53         register unsigned long a1 asm("a1");
  54
  55         n = num;
  56         a0 = arg0;
  57         a1 = arg1;
  58         __asm__ __volatile__(
  59                 KVM_HYPERCALL
  60                 : "=r" (r) : "r" (n), "r" (a0), "r" (a1) : "memory"
  61                 );
  62
  63         return r;
  64 }
  65
  66 static inline unsigned long kvm_hypercall3(unsigned long num,
  67         unsigned long arg0, unsigned long arg1, unsigned long arg2)
  68 {
  69         register unsigned long n asm("v0");
  70         register unsigned long r asm("v0");
  71         register unsigned long a0 asm("a0");
  72         register unsigned long a1 asm("a1");
  73         register unsigned long a2 asm("a2");
  74
  75         n = num;
  76         a0 = arg0;
  77         a1 = arg1;
  78         a2 = arg2;
  79         __asm__ __volatile__(
  80                 KVM_HYPERCALL
  81                 : "=r" (r) : "r" (n), "r" (a0), "r" (a1), "r" (a2) : "memory"
  82                 );
  83
  84         return r;
  85 }
  86
  87 static inline bool kvm_check_and_clear_guest_paused(void)
  88 {
  89         return false;
  90 }
  91
  92 static inline unsigned int kvm_arch_para_features(void)
  93 {
  94         return 0;
  95 }
  96
  97 #ifdef CONFIG_MIPS_PARAVIRT
  98 static inline bool kvm_para_available(void)
  99 {
 100         return true;
 101 }
 102 #else
 103 static inline bool kvm_para_available(void)
 104 {
 105         return false;
 106 }
 107 #endif
 108
 109
 110 #endif /* _ASM_MIPS_KVM_PARA_H */