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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2008-08-01 20:42:05 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-08-01 20:42:05 +0200
commitc6557e7f2b6ae76a44653d38f835174074c42e05 (patch)
treeda619a76b309cb1cd259d082af768a83cfcd6d52 /arch/s390/include/asm/mmu_context.h
parentab4227cb2d936886069ef1056c02500d05beb15d (diff)
[S390] move include/asm-s390 to arch/s390/include/asm
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/mmu_context.h')
-rw-r--r--arch/s390/include/asm/mmu_context.h77
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
new file mode 100644
index 000000000000..4c2fbf48c9c4
--- /dev/null
+++ b/arch/s390/include/asm/mmu_context.h
@@ -0,0 +1,77 @@
+/*
+ * include/asm-s390/mmu_context.h
+ *
+ * S390 version
+ *
+ * Derived from "include/asm-i386/mmu_context.h"
+ */
+
+#ifndef __S390_MMU_CONTEXT_H
+#define __S390_MMU_CONTEXT_H
+
+#include <asm/pgalloc.h>
+#include <asm/uaccess.h>
+#include <asm-generic/mm_hooks.h>
+
+static inline int init_new_context(struct task_struct *tsk,
+ struct mm_struct *mm)
+{
+ mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
+#ifdef CONFIG_64BIT
+ mm->context.asce_bits |= _ASCE_TYPE_REGION3;
+#endif
+ if (current->mm->context.pgstes) {
+ mm->context.noexec = 0;
+ mm->context.pgstes = 1;
+ } else {
+ mm->context.noexec = s390_noexec;
+ mm->context.pgstes = 0;
+ }
+ mm->context.asce_limit = STACK_TOP_MAX;
+ crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
+ return 0;
+}
+
+#define destroy_context(mm) do { } while (0)
+
+#ifndef __s390x__
+#define LCTL_OPCODE "lctl"
+#else
+#define LCTL_OPCODE "lctlg"
+#endif
+
+static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
+{
+ pgd_t *pgd = mm->pgd;
+
+ S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
+ if (switch_amode) {
+ /* Load primary space page table origin. */
+ pgd = mm->context.noexec ? get_shadow_table(pgd) : pgd;
+ S390_lowcore.user_exec_asce = mm->context.asce_bits | __pa(pgd);
+ asm volatile(LCTL_OPCODE" 1,1,%0\n"
+ : : "m" (S390_lowcore.user_exec_asce) );
+ } else
+ /* Load home space page table origin. */
+ asm volatile(LCTL_OPCODE" 13,13,%0"
+ : : "m" (S390_lowcore.user_asce) );
+ set_fs(current->thread.mm_segment);
+}
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+ struct task_struct *tsk)
+{
+ cpu_set(smp_processor_id(), next->cpu_vm_mask);
+ update_mm(next, tsk);
+}
+
+#define enter_lazy_tlb(mm,tsk) do { } while (0)
+#define deactivate_mm(tsk,mm) do { } while (0)
+
+static inline void activate_mm(struct mm_struct *prev,
+ struct mm_struct *next)
+{
+ switch_mm(prev, next, current);
+}
+
+#endif /* __S390_MMU_CONTEXT_H */

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