arch/arm/include/asm/xen/page.h

   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_pfn(v)          (PFN_DOWN(__pa(v)))
  81 #define virt_to_mfn(v)          (pfn_to_mfn(virt_to_pfn(v)))
  82 #define mfn_to_virt(m)          (__va(mfn_to_pfn(m) << PAGE_SHIFT))
  83
  84 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
  85 {
  86         /* TODO: assuming it is mapped in the kernel 1:1 */
  87         return virt_to_machine(vaddr);
  88 }
  89
  90 /* TODO: this shouldn't be here but it is because the frontend drivers
  91  * are using it (its rolled in headers) even though we won't hit the code path.
  92  * So for right now just punt with this.
  93  */
  94 static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
  95 {
  96         BUG();
  97         return NULL;
  98 }
  99
 100 static inline int m2p_add_override(unsigned long mfn, struct page *page,
 101                 struct gnttab_map_grant_ref *kmap_op)
 102 {
 103         return 0;
 104 }
 105
 106 static inline int m2p_remove_override(struct page *page, bool clear_pte)
 107 {
 108         return 0;
 109 }
 110
 111 bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
 112 bool __set_phys_to_machine_multi(unsigned long pfn, unsigned long mfn,
 113                 unsigned long nr_pages);
 114
 115 static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
 116 {
 117         return __set_phys_to_machine(pfn, mfn);
 118 }
 119
 120 #define xen_remap(cookie, size) ioremap_cached((cookie), (size))
 121 #define xen_unmap(cookie) iounmap((cookie))
 122
 123 #endif /* _ASM_ARM_XEN_PAGE_H */