1#ifndef _ASM_ARM_XEN_PAGE_H
2#define _ASM_ARM_XEN_PAGE_H
3
4#include <asm/page.h>
5#include <asm/pgtable.h>
6
7#include <linux/pfn.h>
8#include <linux/types.h>
9#include <linux/dma-mapping.h>
10
11#include <xen/xen.h>
12#include <xen/interface/grant_table.h>
13
14#define phys_to_machine_mapping_valid(pfn) (1)
15
16/* Xen machine address */
17typedef struct xmaddr {
18	phys_addr_t maddr;
19} xmaddr_t;
20
21/* Xen pseudo-physical address */
22typedef struct xpaddr {
23	phys_addr_t paddr;
24} xpaddr_t;
25
26#define XMADDR(x)	((xmaddr_t) { .maddr = (x) })
27#define XPADDR(x)	((xpaddr_t) { .paddr = (x) })
28
29#define INVALID_P2M_ENTRY      (~0UL)
30
31/*
32 * The pseudo-physical frame (pfn) used in all the helpers is always based
33 * on Xen page granularity (i.e 4KB).
34 *
35 * A Linux page may be split across multiple non-contiguous Xen page so we
36 * have to keep track with frame based on 4KB page granularity.
37 *
38 * PV drivers should never make a direct usage of those helpers (particularly
39 * pfn_to_gfn and gfn_to_pfn).
40 */
41
42unsigned long __pfn_to_mfn(unsigned long pfn);
43extern struct rb_root phys_to_mach;
44
45/* Pseudo-physical <-> Guest conversion */
46static inline unsigned long pfn_to_gfn(unsigned long pfn)
47{
48	return pfn;
49}
50
51static inline unsigned long gfn_to_pfn(unsigned long gfn)
52{
53	return gfn;
54}
55
56/* Pseudo-physical <-> BUS conversion */
57static inline unsigned long pfn_to_bfn(unsigned long pfn)
58{
59	unsigned long mfn;
60
61	if (phys_to_mach.rb_node != NULL) {
62		mfn = __pfn_to_mfn(pfn);
63		if (mfn != INVALID_P2M_ENTRY)
64			return mfn;
65	}
66
67	return pfn;
68}
69
70static inline unsigned long bfn_to_pfn(unsigned long bfn)
71{
72	return bfn;
73}
74
75#define bfn_to_local_pfn(bfn)	bfn_to_pfn(bfn)
76
77/* VIRT <-> GUEST conversion */
78#define virt_to_gfn(v)		(pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT))
79#define gfn_to_virt(m)		(__va(gfn_to_pfn(m) << XEN_PAGE_SHIFT))
80
81/* Only used in PV code. But ARM guests are always HVM. */
82static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
83{
84	BUG();
85}
86
87/* TODO: this shouldn't be here but it is because the frontend drivers
88 * are using it (its rolled in headers) even though we won't hit the code path.
89 * So for right now just punt with this.
90 */
91static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
92{
93	BUG();
94	return NULL;
95}
96
97extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
98				   struct gnttab_map_grant_ref *kmap_ops,
99				   struct page **pages, unsigned int count);
100
101extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
102				     struct gnttab_unmap_grant_ref *kunmap_ops,
103				     struct page **pages, unsigned int count);
104
105bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
106bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
107		unsigned long nr_pages);
108
109static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
110{
111	return __set_phys_to_machine(pfn, mfn);
112}
113
114#define xen_remap(cookie, size) ioremap_cache((cookie), (size))
115#define xen_unmap(cookie) iounmap((cookie))
116
117bool xen_arch_need_swiotlb(struct device *dev,
118			   phys_addr_t phys,
119			   dma_addr_t dev_addr);
120unsigned long xen_get_swiotlb_free_pages(unsigned int order);
121
122#endif /* _ASM_ARM_XEN_PAGE_H */
123