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 */ 17 typedef struct xmaddr { 18 phys_addr_t maddr; 19 } xmaddr_t; 20 21 /* Xen pseudo-physical address */ 22 typedef 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 42 unsigned long __pfn_to_mfn(unsigned long pfn); 43 extern struct rb_root phys_to_mach; 44 45 /* Pseudo-physical <-> Guest conversion */ 46 static inline unsigned long pfn_to_gfn(unsigned long pfn) 47 { 48 return pfn; 49 } 50 51 static inline unsigned long gfn_to_pfn(unsigned long gfn) 52 { 53 return gfn; 54 } 55 56 /* Pseudo-physical <-> BUS conversion */ 57 static 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 70 static 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. */ 82 static 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 */ 91 static inline pte_t *lookup_address(unsigned long address, unsigned int *level) 92 { 93 BUG(); 94 return NULL; 95 } 96 97 extern 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); 100 101 extern 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); 104 105 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn); 106 bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn, 107 unsigned long nr_pages); 108 109 static 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)) 116 117 bool xen_arch_need_swiotlb(struct device *dev, 118 phys_addr_t phys, 119 dma_addr_t dev_addr); 120 unsigned long xen_get_swiotlb_free_pages(unsigned int order); 121 122 #endif /* _ASM_ARM_XEN_PAGE_H */ 123