From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Mon, 22 Oct 2007 10:52:47 +0000 (+0200)
Subject: [S390] Cleanup page table definitions.
X-Git-Tag: v2.6.24-rc1~60^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3610cce87af0693603db171d5b6f6735f5e3dc5b;p=pandora-kernel.git

[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>
---

diff --git a/arch/s390/mm/Makefile b/arch/s390/mm/Makefile
index f95449b29fa5..66401930f83e 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 3a25bbf2eb0a..90ec058aa7db 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));
Reading git-diff-tree failed