forked from luck/tmp_suning_uos_patched
3610cce87a
- 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>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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* include/asm-s390/mmu_context.h
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*
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* S390 version
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*
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* Derived from "include/asm-i386/mmu_context.h"
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*/
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#ifndef __S390_MMU_CONTEXT_H
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#define __S390_MMU_CONTEXT_H
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#include <asm/pgalloc.h>
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#include <asm-generic/mm_hooks.h>
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/*
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* get a new mmu context.. S390 don't know about contexts.
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*/
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#define init_new_context(tsk,mm) 0
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#define destroy_context(mm) do { } while (0)
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#ifndef __s390x__
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#define LCTL_OPCODE "lctl"
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#else
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#define LCTL_OPCODE "lctlg"
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#endif
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static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
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{
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pgd_t *pgd = mm->pgd;
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unsigned long asce_bits;
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/* Calculate asce bits from the first pgd table entry. */
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asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
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#ifdef CONFIG_64BIT
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asce_bits |= _ASCE_TYPE_REGION3;
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#endif
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S390_lowcore.user_asce = asce_bits | __pa(pgd);
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if (switch_amode) {
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/* Load primary space page table origin. */
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pgd_t *shadow_pgd = get_shadow_table(pgd) ? : pgd;
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S390_lowcore.user_exec_asce = asce_bits | __pa(shadow_pgd);
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asm volatile(LCTL_OPCODE" 1,1,%0\n"
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: : "m" (S390_lowcore.user_exec_asce) );
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} else
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/* Load home space page table origin. */
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asm volatile(LCTL_OPCODE" 13,13,%0"
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: : "m" (S390_lowcore.user_asce) );
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}
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk)
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{
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if (unlikely(prev == next))
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return;
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cpu_set(smp_processor_id(), next->cpu_vm_mask);
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update_mm(next, tsk);
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}
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#define enter_lazy_tlb(mm,tsk) do { } while (0)
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#define deactivate_mm(tsk,mm) do { } while (0)
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static inline void activate_mm(struct mm_struct *prev,
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struct mm_struct *next)
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{
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switch_mm(prev, next, current);
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set_fs(current->thread.mm_segment);
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}
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#endif /* __S390_MMU_CONTEXT_H */
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