2 * Copyright (C) 2006 Hollis Blanchard <hollisb@us.ibm.com>, IBM Corporation
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 static unsigned long kernel_virtual_offset
;
22 static int is_xencomm_initialized
;
24 /* for xen early printk. It uses console io hypercall which uses xencomm.
25 * However early printk may use it before xencomm initialization.
28 xencomm_is_initialized(void)
30 return is_xencomm_initialized
;
34 xencomm_initialize(void)
36 kernel_virtual_offset
= KERNEL_START
- ia64_tpa(KERNEL_START
);
37 is_xencomm_initialized
= 1;
40 /* Translate virtual address to physical address. */
42 xencomm_vtop(unsigned long vaddr
)
45 struct vm_area_struct
*vma
;
50 if (REGION_NUMBER(vaddr
) == 5) {
56 /* On ia64, TASK_SIZE refers to current. It is not initialized
58 Furthermore the kernel is relocatable and __pa() doesn't
60 if (vaddr
>= KERNEL_START
61 && vaddr
< (KERNEL_START
+ KERNEL_TR_PAGE_SIZE
))
62 return vaddr
- kernel_virtual_offset
;
64 /* In kernel area -- virtually mapped. */
65 pgd
= pgd_offset_k(vaddr
);
66 if (pgd_none(*pgd
) || pgd_bad(*pgd
))
69 pud
= pud_offset(pgd
, vaddr
);
70 if (pud_none(*pud
) || pud_bad(*pud
))
73 pmd
= pmd_offset(pud
, vaddr
);
74 if (pmd_none(*pmd
) || pmd_bad(*pmd
))
77 ptep
= pte_offset_kernel(pmd
, vaddr
);
81 return (pte_val(*ptep
) & _PFN_MASK
) | (vaddr
& ~PAGE_MASK
);
84 if (vaddr
> TASK_SIZE
) {
85 /* percpu variables */
86 if (REGION_NUMBER(vaddr
) == 7 &&
87 REGION_OFFSET(vaddr
) >= (1ULL << IA64_MAX_PHYS_BITS
))
94 /* XXX double-check (lack of) locking */
95 vma
= find_extend_vma(current
->mm
, vaddr
);
99 /* We assume the page is modified. */
100 page
= follow_page(vma
, vaddr
, FOLL_WRITE
| FOLL_TOUCH
);
104 return (page_to_pfn(page
) << PAGE_SHIFT
) | (vaddr
& ~PAGE_MASK
);
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