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