mirror of
https://github.com/torvalds/linux.git
synced 2024-12-11 13:41:55 +00:00
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
/*
|
|
* 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-generic/mm_hooks.h>
|
|
|
|
/*
|
|
* get a new mmu context.. S390 don't know about contexts.
|
|
*/
|
|
#define init_new_context(tsk,mm) 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;
|
|
unsigned long asce_bits;
|
|
|
|
/* Calculate asce bits from the first pgd table entry. */
|
|
asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
|
|
#ifdef CONFIG_64BIT
|
|
asce_bits |= _ASCE_TYPE_REGION3;
|
|
#endif
|
|
S390_lowcore.user_asce = asce_bits | __pa(pgd);
|
|
if (switch_amode) {
|
|
/* Load primary space page table origin. */
|
|
pgd_t *shadow_pgd = get_shadow_table(pgd) ? : pgd;
|
|
S390_lowcore.user_exec_asce = asce_bits | __pa(shadow_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) );
|
|
}
|
|
|
|
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
if (unlikely(prev == next))
|
|
return;
|
|
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);
|
|
set_fs(current->thread.mm_segment);
|
|
}
|
|
|
|
#endif /* __S390_MMU_CONTEXT_H */
|