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#define mfn_to_virt(m)			(__va(mfn_to_pfn(m) << PAGE_SHIFT))
16
17#define pte_mfn	    pte_pfn
18#define mfn_pte	    pfn_pte
19
20/* Xen machine address */
21typedef struct xmaddr {
22	phys_addr_t maddr;
23} xmaddr_t;
24
25/* Xen pseudo-physical address */
26typedef struct xpaddr {
27	phys_addr_t paddr;
28} xpaddr_t;
29
30#define XMADDR(x)	((xmaddr_t) { .maddr = (x) })
31#define XPADDR(x)	((xpaddr_t) { .paddr = (x) })
32
33#define INVALID_P2M_ENTRY      (~0UL)
34
35unsigned long __pfn_to_mfn(unsigned long pfn);
36extern struct rb_root phys_to_mach;
37
38static inline unsigned long pfn_to_mfn(unsigned long pfn)
39{
40	unsigned long mfn;
41
42	if (phys_to_mach.rb_node != NULL) {
43		mfn = __pfn_to_mfn(pfn);
44		if (mfn != INVALID_P2M_ENTRY)
45			return mfn;
46	}
47
48	return pfn;
49}
50
51static inline unsigned long mfn_to_pfn(unsigned long mfn)
52{
53	return mfn;
54}
55
56#define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn)
57
58static inline xmaddr_t phys_to_machine(xpaddr_t phys)
59{
60	unsigned offset = phys.paddr & ~PAGE_MASK;
61	return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
62}
63
64static inline xpaddr_t machine_to_phys(xmaddr_t machine)
65{
66	unsigned offset = machine.maddr & ~PAGE_MASK;
67	return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
68}
69/* VIRT <-> MACHINE conversion */
70#define virt_to_machine(v)	(phys_to_machine(XPADDR(__pa(v))))
71#define virt_to_mfn(v)		(pfn_to_mfn(virt_to_pfn(v)))
72#define mfn_to_virt(m)		(__va(mfn_to_pfn(m) << PAGE_SHIFT))
73
74static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
75{
76	/* TODO: assuming it is mapped in the kernel 1:1 */
77	return virt_to_machine(vaddr);
78}
79
80/* TODO: this shouldn't be here but it is because the frontend drivers
81 * are using it (its rolled in headers) even though we won't hit the code path.
82 * So for right now just punt with this.
83 */
84static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
85{
86	BUG();
87	return NULL;
88}
89
90extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
91				   struct gnttab_map_grant_ref *kmap_ops,
92				   struct page **pages, unsigned int count);
93
94extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
95				     struct gnttab_map_grant_ref *kmap_ops,
96				     struct page **pages, unsigned int count);
97
98bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
99bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
100		unsigned long nr_pages);
101
102static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
103{
104	return __set_phys_to_machine(pfn, mfn);
105}
106
107#define xen_remap(cookie, size) ioremap_cache((cookie), (size))
108#define xen_unmap(cookie) iounmap((cookie))
109
110#endif /* _ASM_ARM_XEN_PAGE_H */
111