xref: /openbmc/linux/arch/x86/include/asm/acrn.h (revision c4f7ac64)
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 
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  */
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 
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 
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