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 /* 14 * Timing Information. 15 * This leaf returns the current TSC frequency in kHz. 16 * 17 * EAX: (Virtual) TSC frequency in kHz. 18 * EBX, ECX, EDX: RESERVED (reserved fields are set to zero). 19 */ 20 #define ACRN_CPUID_TIMING_INFO 0x40000010 21 22 void acrn_setup_intr_handler(void (*handler)(void)); 23 void acrn_remove_intr_handler(void); 24 25 static inline u32 acrn_cpuid_base(void) 26 { 27 if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) 28 return hypervisor_cpuid_base("ACRNACRNACRN", 0); 29 30 return 0; 31 } 32 33 static inline unsigned long acrn_get_tsc_khz(void) 34 { 35 return cpuid_eax(ACRN_CPUID_TIMING_INFO); 36 } 37 38 /* 39 * Hypercalls for ACRN 40 * 41 * - VMCALL instruction is used to implement ACRN hypercalls. 42 * - ACRN hypercall ABI: 43 * - Hypercall number is passed in R8 register. 44 * - Up to 2 arguments are passed in RDI, RSI. 45 * - Return value will be placed in RAX. 46 * 47 * Because GCC doesn't support R8 register as direct register constraints, use 48 * supported constraint as input with a explicit MOV to R8 in beginning of asm. 49 */ 50 static inline long acrn_hypercall0(unsigned long hcall_id) 51 { 52 long result; 53 54 asm volatile("movl %1, %%r8d\n\t" 55 "vmcall\n\t" 56 : "=a" (result) 57 : "g" (hcall_id) 58 : "r8", "memory"); 59 60 return result; 61 } 62 63 static inline long acrn_hypercall1(unsigned long hcall_id, 64 unsigned long param1) 65 { 66 long result; 67 68 asm volatile("movl %1, %%r8d\n\t" 69 "vmcall\n\t" 70 : "=a" (result) 71 : "g" (hcall_id), "D" (param1) 72 : "r8", "memory"); 73 74 return result; 75 } 76 77 static inline long acrn_hypercall2(unsigned long hcall_id, 78 unsigned long param1, 79 unsigned long param2) 80 { 81 long result; 82 83 asm volatile("movl %1, %%r8d\n\t" 84 "vmcall\n\t" 85 : "=a" (result) 86 : "g" (hcall_id), "D" (param1), "S" (param2) 87 : "r8", "memory"); 88 89 return result; 90 } 91 92 #endif /* _ASM_X86_ACRN_H */ 93