1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /******************************************************************************
3 * asm-x86/guest/hyperv-hcall.h
4 *
5 * Copyright (c) 2019 Microsoft.
6 */
7
8 #ifndef __X86_HYPERV_HCALL_H__
9 #define __X86_HYPERV_HCALL_H__
10
11 #include <xen/lib.h>
12 #include <xen/page-size.h>
13 #include <xen/types.h>
14
15 #include <asm/asm_defns.h>
16 #include <asm/fixmap.h>
17 #include <asm/guest/hyperv-tlfs.h>
18
hv_do_hypercall(uint64_t control,paddr_t input_addr,paddr_t output_addr)19 static inline uint64_t hv_do_hypercall(uint64_t control, paddr_t input_addr,
20 paddr_t output_addr)
21 {
22 uint64_t status;
23 register unsigned long r8 asm ( "r8" ) = output_addr;
24
25 /* See TLFS for volatile registers */
26 asm volatile ( "call hv_hcall_page"
27 : "=a" (status), "+c" (control),
28 "+d" (input_addr) ASM_CALL_CONSTRAINT
29 : "r" (r8)
30 : "memory" );
31
32 return status;
33 }
34
hv_do_fast_hypercall(uint16_t code,uint64_t input1,uint64_t input2)35 static inline uint64_t hv_do_fast_hypercall(uint16_t code,
36 uint64_t input1, uint64_t input2)
37 {
38 uint64_t status;
39 uint64_t control = code | HV_HYPERCALL_FAST_BIT;
40 register unsigned long r8 asm ( "r8" ) = input2;
41
42 /* See TLFS for volatile registers */
43 asm volatile ( "call hv_hcall_page"
44 : "=a" (status), "+c" (control),
45 "+d" (input1) ASM_CALL_CONSTRAINT
46 : "r" (r8) );
47
48 return status;
49 }
50
hv_do_rep_hypercall(uint16_t code,uint16_t rep_count,uint16_t varhead_size,paddr_t input,paddr_t output)51 static inline uint64_t hv_do_rep_hypercall(uint16_t code, uint16_t rep_count,
52 uint16_t varhead_size,
53 paddr_t input, paddr_t output)
54 {
55 uint64_t control = code;
56 uint64_t status;
57 uint16_t rep_comp;
58
59 control |= (uint64_t)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
60 control |= (uint64_t)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
61
62 do {
63 status = hv_do_hypercall(control, input, output);
64 if ( (status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS )
65 break;
66
67 rep_comp = MASK_EXTR(status, HV_HYPERCALL_REP_COMP_MASK);
68
69 control &= ~HV_HYPERCALL_REP_START_MASK;
70 control |= MASK_INSR(rep_comp, HV_HYPERCALL_REP_START_MASK);
71 } while ( rep_comp < rep_count );
72
73 return status;
74 }
75
76 #endif /* __X86_HYPERV_HCALL_H__ */
77
78 /*
79 * Local variables:
80 * mode: C
81 * c-file-style: "BSD"
82 * c-basic-offset: 4
83 * tab-width: 4
84 * indent-tabs-mode: nil
85 * End:
86 */
87