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 10 #include <xen/interface/grant_table.h> 11 12 #define pfn_to_mfn(pfn) (pfn) 13 #define phys_to_machine_mapping_valid(pfn) (1) 14 #define mfn_to_pfn(mfn) (mfn) 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 static inline xmaddr_t phys_to_machine(xpaddr_t phys) 36 { 37 unsigned offset = phys.paddr & ~PAGE_MASK; 38 return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); 39 } 40 41 static inline xpaddr_t machine_to_phys(xmaddr_t machine) 42 { 43 unsigned offset = machine.maddr & ~PAGE_MASK; 44 return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); 45 } 46 /* VIRT <-> MACHINE conversion */ 47 #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) 48 #define virt_to_pfn(v) (PFN_DOWN(__pa(v))) 49 #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) 50 #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) 51 52 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr) 53 { 54 /* TODO: assuming it is mapped in the kernel 1:1 */ 55 return virt_to_machine(vaddr); 56 } 57 58 /* TODO: this shouldn't be here but it is because the frontend drivers 59 * are using it (its rolled in headers) even though we won't hit the code path. 60 * So for right now just punt with this. 61 */ 62 static inline pte_t *lookup_address(unsigned long address, unsigned int *level) 63 { 64 BUG(); 65 return NULL; 66 } 67 68 static inline int m2p_add_override(unsigned long mfn, struct page *page, 69 struct gnttab_map_grant_ref *kmap_op) 70 { 71 return 0; 72 } 73 74 static inline int m2p_remove_override(struct page *page, bool clear_pte) 75 { 76 return 0; 77 } 78 79 static inline bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn) 80 { 81 BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY); 82 return true; 83 } 84 85 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn) 86 { 87 return __set_phys_to_machine(pfn, mfn); 88 } 89 #endif /* _ASM_ARM_XEN_PAGE_H */ 90