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
  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
  90 #define xen_remap(cookie, size) ioremap_cached((cookie), (size));
  91
  92 #endif /* _ASM_ARM_XEN_PAGE_H */