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 */ 21 typedef struct xmaddr { 22 phys_addr_t maddr; 23 } xmaddr_t; 24 25 /* Xen pseudo-physical address */ 26 typedef 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 35 unsigned long __pfn_to_mfn(unsigned long pfn); 36 unsigned long __mfn_to_pfn(unsigned long mfn); 37 extern struct rb_root phys_to_mach; 38 39 static inline unsigned long pfn_to_mfn(unsigned long pfn) 40 { 41 unsigned long mfn; 42 43 if (phys_to_mach.rb_node != NULL) { 44 mfn = __pfn_to_mfn(pfn); 45 if (mfn != INVALID_P2M_ENTRY) 46 return mfn; 47 } 48 49 return pfn; 50 } 51 52 static inline unsigned long mfn_to_pfn(unsigned long mfn) 53 { 54 unsigned long pfn; 55 56 if (phys_to_mach.rb_node != NULL) { 57 pfn = __mfn_to_pfn(mfn); 58 if (pfn != INVALID_P2M_ENTRY) 59 return pfn; 60 } 61 62 return mfn; 63 } 64 65 #define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn) 66 67 static inline xmaddr_t phys_to_machine(xpaddr_t phys) 68 { 69 unsigned offset = phys.paddr & ~PAGE_MASK; 70 return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); 71 } 72 73 static inline xpaddr_t machine_to_phys(xmaddr_t machine) 74 { 75 unsigned offset = machine.maddr & ~PAGE_MASK; 76 return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); 77 } 78 /* VIRT <-> MACHINE conversion */ 79 #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) 80 #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) 81 #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) 82 83 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr) 84 { 85 /* TODO: assuming it is mapped in the kernel 1:1 */ 86 return virt_to_machine(vaddr); 87 } 88 89 /* TODO: this shouldn't be here but it is because the frontend drivers 90 * are using it (its rolled in headers) even though we won't hit the code path. 91 * So for right now just punt with this. 92 */ 93 static inline pte_t *lookup_address(unsigned long address, unsigned int *level) 94 { 95 BUG(); 96 return NULL; 97 } 98 99 extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops, 100 struct gnttab_map_grant_ref *kmap_ops, 101 struct page **pages, unsigned int count); 102 103 extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops, 104 struct gnttab_map_grant_ref *kmap_ops, 105 struct page **pages, unsigned int count); 106 107 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); 108 bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn, 109 unsigned long nr_pages); 110 111 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn) 112 { 113 return __set_phys_to_machine(pfn, mfn); 114 } 115 116 #define xen_remap(cookie, size) ioremap_cache((cookie), (size)) 117 #define xen_unmap(cookie) iounmap((cookie)) 118 119 #endif /* _ASM_ARM_XEN_PAGE_H */ 120