mmu.h

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#ifndef __MMU_H
#define __MMU_H

#include <linux/errno.h>

typedef struct {
    atomic_t attach_count;
    unsigned int flush_mm;
    spinlock_t list_lock;
    struct list_head pgtable_list;
    struct list_head gmap_list;
    unsigned long asce_bits;
    unsigned long asce_limit;
    unsigned long vdso_base;
    /* Cloned contexts will be created with extended page tables. */
    unsigned int alloc_pgste:1;
    /* The mmu context has extended page tables. */
    unsigned int has_pgste:1;
} mm_context_t;

#define INIT_MM_CONTEXT(name)                             \
    .context.list_lock    = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
    .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list),    \
    .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),

static inline int tprot(unsigned long addr)
{
    int rc = -EFAULT;

    asm volatile(
        "   tprot   0(%1),0\n"
        "0: ipm %0\n"
        "   srl %0,28\n"
        "1:\n"
        EX_TABLE(0b,1b)
        : "+d" (rc) : "a" (addr) : "cc");
    return rc;
}

#endif