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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __MMU_H
#define __MMU_H
#include <linux/cpumask.h>
#include <linux/errno.h>
typedef struct {
spinlock_t lock;
cpumask_t cpu_attach_mask;
atomic_t flush_count;
unsigned int flush_mm;
struct list_head pgtable_list;
struct list_head gmap_list;
unsigned long gmap_asce;
unsigned long asce;
unsigned long asce_limit;
unsigned long vdso_base;
/* The mmu context belongs to a secure guest. */
atomic_t is_protected;
/*
* The following bitfields need a down_write on the mm
* semaphore when they are written to. As they are only
* written once, they can be read without a lock.
*
* The mmu context allocates 4K page tables.
*/
unsigned int alloc_pgste:1;
/* The mmu context uses extended page tables. */
unsigned int has_pgste:1;
/* The mmu context uses storage keys. */
unsigned int uses_skeys:1;
/* The mmu context uses CMM. */
unsigned int uses_cmm:1;
/* The gmaps associated with this context are allowed to use huge pages. */
unsigned int allow_gmap_hpage_1m:1;
} mm_context_t;
#define INIT_MM_CONTEXT(name) \
.context.lock = __SPIN_LOCK_UNLOCKED(name.context.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
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