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
13 void acrn_setup_intr_handler(void (*handler)(void));
14 void acrn_remove_intr_handler(void);
15
acrn_cpuid_base(void)16 static 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 */
acrn_hypercall0(unsigned long hcall_id)36 static 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
acrn_hypercall1(unsigned long hcall_id,unsigned long param1)49 static 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
acrn_hypercall2(unsigned long hcall_id,unsigned long param1,unsigned long param2)63 static 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