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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2008-02-09 18:24:36 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-02-09 18:24:40 +0100
commit5a216a20837c5f5fa1ca4b8ae8991ffd96b08e6f (patch)
treedde54e28497e920fa460cc95dadb6b38f1b2dbe0 /arch
parent146e4b3c8b92071b18f0b2e6f47165bad4f9e825 (diff)
[S390] Add four level page tables for CONFIG_64BIT=y.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/mm/init.c4
-rw-r--r--arch/s390/mm/vmem.c14
2 files changed, 15 insertions, 3 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 01dfe20f846..248a7101070 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -112,8 +112,8 @@ void __init paging_init(void)
init_mm.pgd = swapper_pg_dir;
S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
#ifdef CONFIG_64BIT
- S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
- pgd_type = _REGION3_ENTRY_EMPTY;
+ S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION2 | _ASCE_TABLE_LENGTH;
+ pgd_type = _REGION2_ENTRY_EMPTY;
#else
S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH;
pgd_type = _SEGMENT_ENTRY_EMPTY;
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 434491f8f47..35d90a4720f 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -69,7 +69,19 @@ static void __ref *vmem_alloc_pages(unsigned int order)
return alloc_bootmem_pages((1 << order) * PAGE_SIZE);
}
-#define vmem_pud_alloc() ({ BUG(); ((pud_t *) NULL); })
+static inline pud_t *vmem_pud_alloc(void)
+{
+ pud_t *pud = NULL;
+
+#ifdef CONFIG_64BIT
+ pud = vmem_alloc_pages(2);
+ if (!pud)
+ return NULL;
+ pud_val(*pud) = _REGION3_ENTRY_EMPTY;
+ memcpy(pud + 1, pud, (PTRS_PER_PUD - 1)*sizeof(pud_t));
+#endif
+ return pud;
+}
static inline pmd_t *vmem_pmd_alloc(void)
{