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author | iap10@labyrinth.cl.cam.ac.uk <iap10@labyrinth.cl.cam.ac.uk> | 2003-02-24 16:55:07 +0000 |
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committer | iap10@labyrinth.cl.cam.ac.uk <iap10@labyrinth.cl.cam.ac.uk> | 2003-02-24 16:55:07 +0000 |
commit | a48212cb65e09669ed243581556529681cebba0a (patch) | |
tree | a58f47e4764f343db87eba48d17ce9b2ddbf8047 /old/xenolinux-2.4.16-sparse/include/asm-xeno/pgtable-2level.h | |
parent | 96ce9e11d148a721557d48ed5a8ca7857a7bc937 (diff) | |
download | xen-a48212cb65e09669ed243581556529681cebba0a.tar.gz xen-a48212cb65e09669ed243581556529681cebba0a.tar.bz2 xen-a48212cb65e09669ed243581556529681cebba0a.zip |
bitkeeper revision 1.93 (3e5a4e6bkPheUp3x1uufN2MS3LAB7A)
Latest and Greatest version of XenoLinux based on the Linux-2.4.21-pre4
kernel.
Diffstat (limited to 'old/xenolinux-2.4.16-sparse/include/asm-xeno/pgtable-2level.h')
-rw-r--r-- | old/xenolinux-2.4.16-sparse/include/asm-xeno/pgtable-2level.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/old/xenolinux-2.4.16-sparse/include/asm-xeno/pgtable-2level.h b/old/xenolinux-2.4.16-sparse/include/asm-xeno/pgtable-2level.h new file mode 100644 index 0000000000..735ac99311 --- /dev/null +++ b/old/xenolinux-2.4.16-sparse/include/asm-xeno/pgtable-2level.h @@ -0,0 +1,70 @@ +#ifndef _I386_PGTABLE_2LEVEL_H +#define _I386_PGTABLE_2LEVEL_H + +/* + * traditional i386 two-level paging structure: + */ + +#define PGDIR_SHIFT 22 +#define PTRS_PER_PGD 1024 + +/* + * the i386 is two-level, so we don't really have any + * PMD directory physically. + */ +#define PMD_SHIFT 22 +#define PTRS_PER_PMD 1 + +#define PTRS_PER_PTE 1024 + +#define pte_ERROR(e) \ + printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low) +#define pmd_ERROR(e) \ + printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) +#define pgd_ERROR(e) \ + printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) + +/* + * The "pgd_xxx()" functions here are trivial for a folded two-level + * setup: the pgd is never bad, and a pmd always exists (as it's folded + * into the pgd entry) + */ +static inline int pgd_none(pgd_t pgd) { return 0; } +static inline int pgd_bad(pgd_t pgd) { return 0; } +static inline int pgd_present(pgd_t pgd) { return 1; } +#define pgd_clear(xp) do { } while (0) + +#define set_pte(pteptr, pteval) queue_l1_entry_update(__pa(pteptr), (pteval).pte_low) +#define set_pmd(pmdptr, pmdval) queue_l2_entry_update(__pa(pmdptr), (pmdval).pmd) +#define set_pgd(pgdptr, pgdval) ((void)0) + +#define pgd_page(pgd) \ +((unsigned long) __va(pgd_val(pgd) & PAGE_MASK)) + +static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) +{ + return (pmd_t *) dir; +} + +/* + * A note on implementation of this atomic 'get-and-clear' operation. + * This is actually very simple because XenoLinux can only run on a single + * processor. Therefore, we cannot race other processors setting the 'accessed' + * or 'dirty' bits on a page-table entry. + * Even if pages are shared between domains, that is not a problem because + * each domain will have separate page tables, with their own versions of + * accessed & dirty state. + */ +static inline pte_t ptep_get_and_clear(pte_t *xp) +{ + pte_t pte = *xp; + queue_l1_entry_update(__pa(xp), 0); + return pte; +} + +#define pte_same(a, b) ((a).pte_low == (b).pte_low) +#define pte_page(x) (mem_map+((unsigned long)((pte_val(x) >> PAGE_SHIFT)))) +#define pte_none(x) (!(x).pte_low) +#define __mk_pte(page_nr,pgprot) __pte(((page_nr) << PAGE_SHIFT) | pgprot_val(pgprot)) + +#endif /* _I386_PGTABLE_2LEVEL_H */ |