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 #define pte_mfn pte_pfn 17 #define mfn_pte pfn_pte 18 19 /* Xen machine address */ 20 typedef struct xmaddr { 21 phys_addr_t maddr; 22 } xmaddr_t; 23 24 /* Xen pseudo-physical address */ 25 typedef struct xpaddr { 26 phys_addr_t paddr; 27 } xpaddr_t; 28 29 #define XMADDR(x) ((xmaddr_t) { .maddr = (x) }) 30 #define XPADDR(x) ((xpaddr_t) { .paddr = (x) }) 31 32 #define INVALID_P2M_ENTRY (~0UL) 33 34 unsigned long __pfn_to_mfn(unsigned long pfn); 35 extern struct rb_root phys_to_mach; 36 37 static inline unsigned long pfn_to_mfn(unsigned long pfn) 38 { 39 unsigned long mfn; 40 41 if (phys_to_mach.rb_node != NULL) { 42 mfn = __pfn_to_mfn(pfn); 43 if (mfn != INVALID_P2M_ENTRY) 44 return mfn; 45 } 46 47 return pfn; 48 } 49 50 static inline unsigned long mfn_to_pfn(unsigned long mfn) 51 { 52 return mfn; 53 } 54 55 #define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn) 56 57 static inline xmaddr_t phys_to_machine(xpaddr_t phys) 58 { 59 unsigned offset = phys.paddr & ~PAGE_MASK; 60 return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); 61 } 62 63 static inline xpaddr_t machine_to_phys(xmaddr_t machine) 64 { 65 unsigned offset = machine.maddr & ~PAGE_MASK; 66 return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); 67 } 68 /* VIRT <-> MACHINE conversion */ 69 #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) 70 #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) 71 #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) 72 73 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr) 74 { 75 /* TODO: assuming it is mapped in the kernel 1:1 */ 76 return virt_to_machine(vaddr); 77 } 78 79 /* TODO: this shouldn't be here but it is because the frontend drivers 80 * are using it (its rolled in headers) even though we won't hit the code path. 81 * So for right now just punt with this. 82 */ 83 static inline pte_t *lookup_address(unsigned long address, unsigned int *level) 84 { 85 BUG(); 86 return NULL; 87 } 88 89 extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops, 90 struct gnttab_map_grant_ref *kmap_ops, 91 struct page **pages, unsigned int count); 92 93 extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops, 94 struct gnttab_unmap_grant_ref *kunmap_ops, 95 struct page **pages, unsigned int count); 96 97 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); 98 bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn, 99 unsigned long nr_pages); 100 101 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn) 102 { 103 return __set_phys_to_machine(pfn, mfn); 104 } 105 106 #define xen_remap(cookie, size) ioremap_cache((cookie), (size)) 107 #define xen_unmap(cookie) iounmap((cookie)) 108 109 bool xen_arch_need_swiotlb(struct device *dev, 110 unsigned long pfn, 111 unsigned long mfn); 112 unsigned long xen_get_swiotlb_free_pages(unsigned int order); 113 114 #endif /* _ASM_ARM_XEN_PAGE_H */ 115