1/* SPDX-License-Identifier: GPL-2.0
2 *
3 * Guest OS interface to ARM Xen.
4 *
5 * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012
6 */
7
8#ifndef _ASM_ARM_XEN_INTERFACE_H
9#define _ASM_ARM_XEN_INTERFACE_H
10
11#ifndef __ASSEMBLY__
12#include <linux/types.h>
13#endif
14
15#define uint64_aligned_t u64 __attribute__((aligned(8)))
16
17#define __DEFINE_GUEST_HANDLE(name, type) \
18	typedef struct { union { type * p; uint64_aligned_t q; }; }  \
19		__guest_handle_ ## name
20
21#define DEFINE_GUEST_HANDLE_STRUCT(name) \
22	__DEFINE_GUEST_HANDLE(name, struct name)
23#define DEFINE_GUEST_HANDLE(name) __DEFINE_GUEST_HANDLE(name, name)
24#define GUEST_HANDLE(name)        __guest_handle_ ## name
25
26#define set_xen_guest_handle(hnd, val)			\
27	do {						\
28		if (sizeof(hnd) == 8)			\
29			*(u64 *)&(hnd) = 0;	\
30		(hnd).p = val;				\
31	} while (0)
32
33#define __HYPERVISOR_platform_op_raw __HYPERVISOR_platform_op
34
35#ifndef __ASSEMBLY__
36/* Explicitly size integers that represent pfns in the interface with
37 * Xen so that we can have one ABI that works for 32 and 64 bit guests.
38 * Note that this means that the xen_pfn_t type may be capable of
39 * representing pfn's which the guest cannot represent in its own pfn
40 * type. However since pfn space is controlled by the guest this is
41 * fine since it simply wouldn't be able to create any sure pfns in
42 * the first place.
43 */
44typedef u64 xen_pfn_t;
45#define PRI_xen_pfn "llx"
46typedef u64 xen_ulong_t;
47#define PRI_xen_ulong "llx"
48typedef s64 xen_long_t;
49#define PRI_xen_long "llx"
50/* Guest handles for primitive C types. */
51__DEFINE_GUEST_HANDLE(uchar, unsigned char);
52__DEFINE_GUEST_HANDLE(uint,  unsigned int);
53DEFINE_GUEST_HANDLE(char);
54DEFINE_GUEST_HANDLE(int);
55DEFINE_GUEST_HANDLE(void);
56DEFINE_GUEST_HANDLE(u64);
57DEFINE_GUEST_HANDLE(u32);
58DEFINE_GUEST_HANDLE(xen_pfn_t);
59DEFINE_GUEST_HANDLE(xen_ulong_t);
60
61/* Maximum number of virtual CPUs in multi-processor guests. */
62#define MAX_VIRT_CPUS 1
63
64struct arch_vcpu_info { };
65struct arch_shared_info { };
66
67/* TODO: Move pvclock definitions some place arch independent */
68struct pvclock_vcpu_time_info {
69	u32   version;
70	u32   pad0;
71	u64   tsc_timestamp;
72	u64   system_time;
73	u32   tsc_to_system_mul;
74	s8    tsc_shift;
75	u8    flags;
76	u8    pad[2];
77} __attribute__((__packed__)); /* 32 bytes */
78
79/* It is OK to have a 12 bytes struct with no padding because it is packed */
80struct pvclock_wall_clock {
81	u32   version;
82	u32   sec;
83	u32   nsec;
84	u32   sec_hi;
85} __attribute__((__packed__));
86#endif
87
88#endif /* _ASM_ARM_XEN_INTERFACE_H */
89