From 3610cce87af0693603db171d5b6f6735f5e3dc5b Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Mon, 22 Oct 2007 12:52:47 +0200 Subject: [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 --- arch/s390/mm/Makefile | 2 +- arch/s390/mm/init.c | 28 +++++++-------- arch/s390/mm/pgtable.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++ arch/s390/mm/vmem.c | 19 ++++------ 4 files changed, 114 insertions(+), 29 deletions(-) create mode 100644 arch/s390/mm/pgtable.c (limited to 'arch/s390/mm') diff --git a/arch/s390/mm/Makefile b/arch/s390/mm/Makefile index f95449b29fa..66401930f83 100644 --- a/arch/s390/mm/Makefile +++ b/arch/s390/mm/Makefile @@ -2,6 +2,6 @@ # Makefile for the linux s390-specific parts of the memory manager. # -obj-y := init.o fault.o extmem.o mmap.o vmem.o +obj-y := init.o fault.o extmem.o mmap.o vmem.o pgtable.o obj-$(CONFIG_CMM) += cmm.o diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 3a25bbf2eb0..90ec058aa7d 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -103,32 +103,28 @@ static void __init setup_ro_region(void) */ void __init paging_init(void) { - pgd_t *pg_dir; - int i; - unsigned long pgdir_k; static const int ssm_mask = 0x04000000L; unsigned long max_zone_pfns[MAX_NR_ZONES]; + unsigned long pgd_type; - pg_dir = swapper_pg_dir; - + init_mm.pgd = swapper_pg_dir; + S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK; #ifdef CONFIG_64BIT - pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERN_REGION_TABLE; - for (i = 0; i < PTRS_PER_PGD; i++) - pgd_clear_kernel(pg_dir + i); + S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH; + pgd_type = _REGION3_ENTRY_EMPTY; #else - pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; - for (i = 0; i < PTRS_PER_PGD; i++) - pmd_clear_kernel((pmd_t *)(pg_dir + i)); + S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH; + pgd_type = _SEGMENT_ENTRY_EMPTY; #endif + clear_table((unsigned long *) init_mm.pgd, pgd_type, + sizeof(unsigned long)*2048); vmem_map_init(); setup_ro_region(); - S390_lowcore.kernel_asce = pgdir_k; - /* enable virtual mapping in kernel mode */ - __ctl_load(pgdir_k, 1, 1); - __ctl_load(pgdir_k, 7, 7); - __ctl_load(pgdir_k, 13, 13); + __ctl_load(S390_lowcore.kernel_asce, 1, 1); + __ctl_load(S390_lowcore.kernel_asce, 7, 7); + __ctl_load(S390_lowcore.kernel_asce, 13, 13); __raw_local_irq_ssm(ssm_mask); memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c new file mode 100644 index 00000000000..e60e0ae1340 --- /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 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#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); + +} diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index fd594d5fe14..1bd51d84048 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -75,29 +75,24 @@ static void __init_refok *vmem_alloc_pages(unsigned int order) static inline pmd_t *vmem_pmd_alloc(void) { - pmd_t *pmd; - int i; + pmd_t *pmd = NULL; - pmd = vmem_alloc_pages(PMD_ALLOC_ORDER); +#ifdef CONFIG_64BIT + pmd = vmem_alloc_pages(2); if (!pmd) return NULL; - for (i = 0; i < PTRS_PER_PMD; i++) - pmd_clear_kernel(pmd + i); + clear_table((unsigned long *) pmd, _SEGMENT_ENTRY_EMPTY, PAGE_SIZE*4); +#endif return pmd; } static inline pte_t *vmem_pte_alloc(void) { - pte_t *pte; - pte_t empty_pte; - int i; + pte_t *pte = vmem_alloc_pages(0); - pte = vmem_alloc_pages(PTE_ALLOC_ORDER); if (!pte) return NULL; - pte_val(empty_pte) = _PAGE_TYPE_EMPTY; - for (i = 0; i < PTRS_PER_PTE; i++) - pte[i] = empty_pte; + clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY, PAGE_SIZE); return pte; } -- cgit v1.2.3