ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-xen/asm-i386/pgtable-2level.h @ 8534:da7873110bbb

Tiny bootstrap cleanup.

Signed-off-by: Keir Fraser <keir@xensource.com>
author kaf24@firebug.cl.cam.ac.uk
date Mon Jan 09 19:46:46 2006 +0100 (2006-01-09)
parents 99a1f5dc75a9
children 990c009015e8
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 #define set_pte_at(_mm,addr,ptep,pteval) do { \
19 if (((_mm) != current->mm && (_mm) != &init_mm) || \
20 HYPERVISOR_update_va_mapping((addr), (pteval), 0)) \
21 set_pte((ptep), (pteval)); \
22 } while (0)
24 #define set_pte_at_sync(_mm,addr,ptep,pteval) do { \
25 if (((_mm) != current->mm && (_mm) != &init_mm) || \
26 HYPERVISOR_update_va_mapping((addr), (pteval), UVMF_INVLPG)) { \
27 set_pte((ptep), (pteval)); \
28 xen_invlpg((addr)); \
29 } \
30 } while (0)
32 #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
34 #ifndef CONFIG_XEN_SHADOW_MODE
35 #define set_pmd(pmdptr, pmdval) xen_l2_entry_update((pmdptr), (pmdval))
36 #else
37 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
38 #endif
40 #define ptep_get_and_clear(mm,addr,xp) __pte_ma(xchg(&(xp)->pte_low, 0))
41 #define pte_same(a, b) ((a).pte_low == (b).pte_low)
42 /*
43 * We detect special mappings in one of two ways:
44 * 1. If the MFN is an I/O page then Xen will set the m2p entry
45 * to be outside our maximum possible pseudophys range.
46 * 2. If the MFN belongs to a different domain then we will certainly
47 * not have MFN in our p2m table. Conversely, if the page is ours,
48 * then we'll have p2m(m2p(MFN))==MFN.
49 * If we detect a special mapping then it doesn't have a 'struct page'.
50 * We force !pfn_valid() by returning an out-of-range pointer.
51 *
52 * NB. These checks require that, for any MFN that is not in our reservation,
53 * there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
54 * we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
55 * Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
56 *
57 * NB2. When deliberately mapping foreign pages into the p2m table, you *must*
58 * use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
59 * require. In all the cases we care about, the FOREIGN_FRAME bit is
60 * masked (e.g., pfn_to_mfn()) so behaviour there is correct.
61 */
62 #define pte_mfn(_pte) ((_pte).pte_low >> PAGE_SHIFT)
63 #define pte_pfn(_pte) \
64 ({ \
65 unsigned long mfn = pte_mfn(_pte); \
66 unsigned long pfn = mfn_to_pfn(mfn); \
67 if ((pfn >= max_mapnr) || (phys_to_machine_mapping[pfn] != mfn))\
68 pfn = max_mapnr; /* special: force !pfn_valid() */ \
69 pfn; \
70 })
72 #define pte_page(_pte) pfn_to_page(pte_pfn(_pte))
74 #define pte_none(x) (!(x).pte_low)
75 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
76 #define pfn_pte_ma(pfn, prot) __pte_ma(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
77 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
79 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
81 #define pmd_page_kernel(pmd) \
82 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
84 /*
85 * All present user pages are user-executable:
86 */
87 static inline int pte_exec(pte_t pte)
88 {
89 return pte_user(pte);
90 }
92 /*
93 * All present pages are kernel-executable:
94 */
95 static inline int pte_exec_kernel(pte_t pte)
96 {
97 return 1;
98 }
100 /*
101 * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
102 * into this range:
103 */
104 #define PTE_FILE_MAX_BITS 29
106 #define pte_to_pgoff(pte) \
107 ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 ))
109 #define pgoff_to_pte(off) \
110 ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE })
112 /* Encode and de-code a swap entry */
113 #define __swp_type(x) (((x).val >> 1) & 0x1f)
114 #define __swp_offset(x) ((x).val >> 8)
115 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
116 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
117 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
119 #endif /* _I386_PGTABLE_2LEVEL_H */