LXR linux/arch/x86/include/asm/acrn.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_ACRN_H
   3#define _ASM_X86_ACRN_H
   4
   5/*
   6 * This CPUID returns feature bitmaps in EAX.
   7 * Guest VM uses this to detect the appropriate feature bit.
   8 */
   9#define ACRN_CPUID_FEATURES             0x40000001
  10/* Bit 0 indicates whether guest VM is privileged */
  11#define ACRN_FEATURE_PRIVILEGED_VM      BIT(0)
  12
  13void acrn_setup_intr_handler(void (*handler)(void));
  14void acrn_remove_intr_handler(void);
  15
  16static inline u32 acrn_cpuid_base(void)
  17{
  18        if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
  19                return hypervisor_cpuid_base("ACRNACRNACRN", 0);
  20
  21        return 0;
  22}
  23
  24/*
  25 * Hypercalls for ACRN
  26 *
  27 * - VMCALL instruction is used to implement ACRN hypercalls.
  28 * - ACRN hypercall ABI:
  29 *   - Hypercall number is passed in R8 register.
  30 *   - Up to 2 arguments are passed in RDI, RSI.
  31 *   - Return value will be placed in RAX.
  32 *
  33 * Because GCC doesn't support R8 register as direct register constraints, use
  34 * supported constraint as input with a explicit MOV to R8 in beginning of asm.
  35 */
  36static inline long acrn_hypercall0(unsigned long hcall_id)
  37{
  38        long result;
  39
  40        asm volatile("movl %1, %%r8d\n\t"
  41                     "vmcall\n\t"
  42                     : "=a" (result)
  43                     : "g" (hcall_id)
  44                     : "r8", "memory");
  45
  46        return result;
  47}
  48
  49static inline long acrn_hypercall1(unsigned long hcall_id,
  50                                   unsigned long param1)
  51{
  52        long result;
  53
  54        asm volatile("movl %1, %%r8d\n\t"
  55                     "vmcall\n\t"
  56                     : "=a" (result)
  57                     : "g" (hcall_id), "D" (param1)
  58                     : "r8", "memory");
  59
  60        return result;
  61}
  62
  63static inline long acrn_hypercall2(unsigned long hcall_id,
  64                                   unsigned long param1,
  65                                   unsigned long param2)
  66{
  67        long result;
  68
  69        asm volatile("movl %1, %%r8d\n\t"
  70                     "vmcall\n\t"
  71                     : "=a" (result)
  72                     : "g" (hcall_id), "D" (param1), "S" (param2)
  73                     : "r8", "memory");
  74
  75        return result;
  76}
  77
  78#endif /* _ASM_X86_ACRN_H */
  79