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author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-10-22 12:52:47 +0200 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-10-22 12:52:49 +0200 |
commit | 3610cce87af0693603db171d5b6f6735f5e3dc5b (patch) | |
tree | 9aa7d9a0924b2f075c1b95ed57bb63ed512165c9 /arch/s390/mm/pgtable.c | |
parent | e4aa402e7a3b6b87d8df6243a37171cdcd2f01c2 (diff) | |
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[S390] Cleanup page table definitions.
- De-confuse the defines for the address-space-control-elements
and the segment/region table entries.
- Create out of line functions for page table allocation / freeing.
- Simplify get_shadow_xxx functions.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/pgtable.c')
-rw-r--r-- | arch/s390/mm/pgtable.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c new file mode 100644 index 0000000..e60e0ae --- /dev/null +++ b/arch/s390/mm/pgtable.c @@ -0,0 +1,94 @@ +/* + * arch/s390/mm/pgtable.c + * + * Copyright IBM Corp. 2007 + * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> + */ + +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/smp.h> +#include <linux/highmem.h> +#include <linux/slab.h> +#include <linux/pagemap.h> +#include <linux/spinlock.h> +#include <linux/module.h> +#include <linux/quicklist.h> + +#include <asm/system.h> +#include <asm/pgtable.h> +#include <asm/pgalloc.h> +#include <asm/tlb.h> +#include <asm/tlbflush.h> + +#ifndef CONFIG_64BIT +#define ALLOC_ORDER 1 +#else +#define ALLOC_ORDER 2 +#endif + +unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec) +{ + struct page *page = alloc_pages(GFP_KERNEL, ALLOC_ORDER); + + if (!page) + return NULL; + page->index = 0; + if (noexec) { + struct page *shadow = alloc_pages(GFP_KERNEL, ALLOC_ORDER); + if (!shadow) { + __free_pages(page, ALLOC_ORDER); + return NULL; + } + page->index = page_to_phys(shadow); + } + return (unsigned long *) page_to_phys(page); +} + +void crst_table_free(unsigned long *table) +{ + unsigned long *shadow = get_shadow_table(table); + + if (shadow) + free_pages((unsigned long) shadow, ALLOC_ORDER); + free_pages((unsigned long) table, ALLOC_ORDER); +} + +/* + * page table entry allocation/free routines. + */ +unsigned long *page_table_alloc(int noexec) +{ + struct page *page = alloc_page(GFP_KERNEL); + unsigned long *table; + + if (!page) + return NULL; + page->index = 0; + if (noexec) { + struct page *shadow = alloc_page(GFP_KERNEL); + if (!shadow) { + __free_page(page); + return NULL; + } + table = (unsigned long *) page_to_phys(shadow); + clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE); + page->index = (addr_t) table; + } + table = (unsigned long *) page_to_phys(page); + clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE); + return table; +} + +void page_table_free(unsigned long *table) +{ + unsigned long *shadow = get_shadow_pte(table); + + if (shadow) + free_page((unsigned long) shadow); + free_page((unsigned long) table); + +} |