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;
24 xencomm_initialize(void)
26 kernel_virtual_offset = KERNEL_START - ia64_tpa(KERNEL_START);
29 /* Translate virtual address to physical address. */
31 xencomm_vtop(unsigned long vaddr)
34 struct vm_area_struct *vma;
39 if (REGION_NUMBER(vaddr) == 5) {
45 /* On ia64, TASK_SIZE refers to current. It is not initialized
47 Furthermore the kernel is relocatable and __pa() doesn't
49 if (vaddr >= KERNEL_START
50 && vaddr < (KERNEL_START + KERNEL_TR_PAGE_SIZE))
51 return vaddr - kernel_virtual_offset;
53 /* In kernel area -- virtually mapped. */
54 pgd = pgd_offset_k(vaddr);
55 if (pgd_none(*pgd) || pgd_bad(*pgd))
58 pud = pud_offset(pgd, vaddr);
59 if (pud_none(*pud) || pud_bad(*pud))
62 pmd = pmd_offset(pud, vaddr);
63 if (pmd_none(*pmd) || pmd_bad(*pmd))
66 ptep = pte_offset_kernel(pmd, vaddr);
70 return (pte_val(*ptep) & _PFN_MASK) | (vaddr & ~PAGE_MASK);
73 if (vaddr > TASK_SIZE) {
74 /* percpu variables */
75 if (REGION_NUMBER(vaddr) == 7 &&
76 REGION_OFFSET(vaddr) >= (1ULL << IA64_MAX_PHYS_BITS))
83 /* XXX double-check (lack of) locking */
84 vma = find_extend_vma(current->mm, vaddr);
88 /* We assume the page is modified. */
89 page = follow_page(vma, vaddr, FOLL_WRITE | FOLL_TOUCH);
93 return (page_to_pfn(page) << PAGE_SHIFT) | (vaddr & ~PAGE_MASK);