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 (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 static inline xmaddr_t phys_to_machine(xpaddr_t phys) 34 { 35 unsigned offset = phys.paddr & ~PAGE_MASK; 36 return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset); 37 } 38 39 static inline xpaddr_t machine_to_phys(xmaddr_t machine) 40 { 41 unsigned offset = machine.maddr & ~PAGE_MASK; 42 return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset); 43 } 44 /* VIRT <-> MACHINE conversion */ 45 #define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v)))) 46 #define virt_to_pfn(v) (PFN_DOWN(__pa(v))) 47 #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) 48 #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT)) 49 50 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr) 51 { 52 /* TODO: assuming it is mapped in the kernel 1:1 */ 53 return virt_to_machine(vaddr); 54 } 55 56 /* TODO: this shouldn't be here but it is because the frontend drivers 57 * are using it (its rolled in headers) even though we won't hit the code path. 58 * So for right now just punt with this. 59 */ 60 static inline pte_t *lookup_address(unsigned long address, unsigned int *level) 61 { 62 BUG(); 63 return NULL; 64 } 65 66 static inline int m2p_add_override(unsigned long mfn, struct page *page, 67 struct gnttab_map_grant_ref *kmap_op) 68 { 69 return 0; 70 } 71 72 static inline int m2p_remove_override(struct page *page, bool clear_pte) 73 { 74 return 0; 75 } 76 77 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn) 78 { 79 BUG(); 80 return false; 81 } 82 #endif /* _ASM_ARM_XEN_PAGE_H */ 83