6f457e1a14
The clear-by-asce operation of the idte instruction gets an asce (address-space-control-element) as argument to specify which TLBs need to get flushed. The current code passes a plain pointer to the start of the pgd without the additional bits which would make the pointer an asce. The current machines don't mind the difference but a future model might want to use the designation type control bits in the asce as a filter for the TLBs to flush. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
67 lines
1.7 KiB
C
67 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>
|
|
|
|
static inline int init_new_context(struct task_struct *tsk,
|
|
struct mm_struct *mm)
|
|
{
|
|
mm->context = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
|
|
#ifdef CONFIG_64BIT
|
|
mm->context |= _ASCE_TYPE_REGION3;
|
|
#endif
|
|
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)
|
|
{
|
|
S390_lowcore.user_asce = mm->context | __pa(mm->pgd);
|
|
if (switch_amode) {
|
|
/* Load primary space page table origin. */
|
|
pgd_t *shadow_pgd = get_shadow_table(mm->pgd) ? : mm->pgd;
|
|
S390_lowcore.user_exec_asce = mm->context | __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 */
|