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User pointer validity checks.

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Added routines that check whether a user pointer is accessible by the kernel,
and if not ask the pager to map-in those pages. I haven't implemented yet the
bit that asks the pager for paging-in.
This commit is contained in:
Bahadir Balban
2008-02-05 15:41:14 +00:00
parent 3a07ae70fd
commit a82cdd3456
8 changed files with 155 additions and 72 deletions
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6
include/l4/glue/arm/memory.h
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@@ -116,6 +116,12 @@ void remove_mapping(unsigned long vaddr);
void remove_mapping_pgd(unsigned long vaddr, pgd_table_t *pgd);
void prealloc_phys_pagedesc(void);
int check_mapping_pgd(unsigned long vaddr, unsigned long size,
unsigned int flags, pgd_table_t *pgd);
int check_mapping(unsigned long vaddr, unsigned long size,
unsigned int flags);
void copy_pgd_kern_all(pgd_table_t *);
pte_t virt_to_pte(unsigned long virtual);
pte_t virt_to_pte_from_pgd(unsigned long virtual, pgd_table_t *pgd);