ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-xen/asm-i386/pgtable-2level.h @ 6552:a9873d384da4

Merge.
author adsharma@los-vmm.sc.intel.com
date Thu Aug 25 12:24:48 2005 -0700 (2005-08-25)
parents 112d44270733 fa0754a9f64f
children dfaf788ab18c
line source
1 #ifndef _I386_PGTABLE_2LEVEL_H
2 #define _I386_PGTABLE_2LEVEL_H
4 #include <asm-generic/pgtable-nopmd.h>
6 #define pte_ERROR(e) \
7 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
8 #define pgd_ERROR(e) \
9 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
11 /*
12 * Certain architectures need to do special things when PTEs
13 * within a page table are directly modified. Thus, the following
14 * hook is made available.
15 */
16 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
18 inline static void set_pte_at(struct mm_struct *mm, unsigned long addr,
19 pte_t *ptep, pte_t val )
20 {
21 if ( ((mm != current->mm) && (mm != &init_mm)) ||
22 HYPERVISOR_update_va_mapping( (addr), (val), 0 ) )
23 {
24 set_pte(ptep, val);
25 }
26 }
28 inline static void set_pte_at_sync(struct mm_struct *mm, unsigned long addr,
29 pte_t *ptep, pte_t val )
30 {
31 if ( ((mm != current->mm) && (mm != &init_mm)) ||
32 HYPERVISOR_update_va_mapping( (addr), (val), UVMF_INVLPG ) )
33 {
34 set_pte(ptep, val);
35 xen_invlpg(addr);
36 }
37 }
39 #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
41 #ifndef CONFIG_XEN_SHADOW_MODE
42 #define set_pmd(pmdptr, pmdval) xen_l2_entry_update((pmdptr), (pmdval))
43 #else
44 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
45 #endif
47 #define ptep_get_and_clear(mm,addr,xp) __pte_ma(xchg(&(xp)->pte_low, 0))
48 #define pte_same(a, b) ((a).pte_low == (b).pte_low)
49 /*
50 * We detect special mappings in one of two ways:
51 * 1. If the MFN is an I/O page then Xen will set the m2p entry
52 * to be outside our maximum possible pseudophys range.
53 * 2. If the MFN belongs to a different domain then we will certainly
54 * not have MFN in our p2m table. Conversely, if the page is ours,
55 * then we'll have p2m(m2p(MFN))==MFN.
56 * If we detect a special mapping then it doesn't have a 'struct page'.
57 * We force !pfn_valid() by returning an out-of-range pointer.
58 *
59 * NB. These checks require that, for any MFN that is not in our reservation,
60 * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
61 * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
62 * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
63 *
64 * NB2. When deliberately mapping foreign pages into the p2m table, you *must*
65 * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
66 * require. In all the cases we care about, the FOREIGN_FRAME bit is
67 * masked (e.g., pfn_to_mfn()) so behaviour there is correct.
68 */
69 #define pte_mfn(_pte) ((_pte).pte_low >> PAGE_SHIFT)
70 #define pte_pfn(_pte) \
71 ({ \
72 unsigned long mfn = pte_mfn(_pte); \
73 unsigned long pfn = mfn_to_pfn(mfn); \
74 if ((pfn >= max_mapnr) || (phys_to_machine_mapping[pfn] != mfn))\
75 pfn = max_mapnr; /* special: force !pfn_valid() */ \
76 pfn; \
77 })
79 #define pte_page(_pte) pfn_to_page(pte_pfn(_pte))
81 #define pte_none(x) (!(x).pte_low)
82 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
83 #define pfn_pte_ma(pfn, prot) __pte_ma(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
84 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
86 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
88 #define pmd_page_kernel(pmd) \
89 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
91 /*
92 * All present user pages are user-executable:
93 */
94 static inline int pte_exec(pte_t pte)
95 {
96 return pte_user(pte);
97 }
99 /*
100 * All present pages are kernel-executable:
101 */
102 static inline int pte_exec_kernel(pte_t pte)
103 {
104 return 1;
105 }
107 /*
108 * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
109 * into this range:
110 */
111 #define PTE_FILE_MAX_BITS 29
113 #define pte_to_pgoff(pte) \
114 ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 ))
116 #define pgoff_to_pte(off) \
117 ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE })
119 /* Encode and de-code a swap entry */
120 #define __swp_type(x) (((x).val >> 1) & 0x1f)
121 #define __swp_offset(x) ((x).val >> 8)
122 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
123 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
124 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
126 #endif /* _I386_PGTABLE_2LEVEL_H */