65eef33550
For lazy storage key handling, we need a mechanism to track if the process ever issued a storage key operation. This patch adds the basic infrastructure for making the storage key handling optional, but still leaves it enabled for now by default. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
42 lines
975 B
C
42 lines
975 B
C
#ifndef __MMU_H
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#define __MMU_H
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#include <linux/cpumask.h>
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#include <linux/errno.h>
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typedef struct {
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cpumask_t cpu_attach_mask;
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atomic_t attach_count;
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unsigned int flush_mm;
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spinlock_t list_lock;
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struct list_head pgtable_list;
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struct list_head gmap_list;
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unsigned long asce_bits;
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unsigned long asce_limit;
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unsigned long vdso_base;
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/* The mmu context has extended page tables. */
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unsigned int has_pgste:1;
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/* The mmu context uses storage keys. */
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unsigned int use_skey:1;
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} mm_context_t;
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#define INIT_MM_CONTEXT(name) \
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.context.list_lock = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
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.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
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.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
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static inline int tprot(unsigned long addr)
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{
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int rc = -EFAULT;
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asm volatile(
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" tprot 0(%1),0\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "+d" (rc) : "a" (addr) : "cc");
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return rc;
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}
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#endif
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