1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __MMU_H
 3#define __MMU_H
 4
 5#include <linux/cpumask.h>
 6#include <linux/errno.h>
 7#include <asm/asm-extable.h>
 8
 9typedef struct {
10	spinlock_t lock;
11	cpumask_t cpu_attach_mask;
12	atomic_t flush_count;
13	unsigned int flush_mm;
 
14	struct list_head pgtable_list;
 
15	struct list_head gmap_list;
16	unsigned long gmap_asce;
17	unsigned long asce;
18	unsigned long asce_limit;
19	unsigned long vdso_base;
20	/* The mmu context belongs to a secure guest. */
21	atomic_t protected_count;
22	/*
23	 * The following bitfields need a down_write on the mm
24	 * semaphore when they are written to. As they are only
25	 * written once, they can be read without a lock.
26	 *
27	 * The mmu context allocates 4K page tables.
28	 */
29	unsigned int alloc_pgste:1;
30	/* The mmu context uses extended page tables. */
31	unsigned int has_pgste:1;
32	/* The mmu context uses storage keys. */
33	unsigned int uses_skeys:1;
34	/* The mmu context uses CMM. */
35	unsigned int uses_cmm:1;
36	/* The gmaps associated with this context are allowed to use huge pages. */
37	unsigned int allow_gmap_hpage_1m:1;
38} mm_context_t;
39
40#define INIT_MM_CONTEXT(name)						   \
41	.context.lock =	__SPIN_LOCK_UNLOCKED(name.context.lock),	   \
 
42	.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
 
43	.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
 
 
 
 
 
 
 
 
 
 
 
 
 
 
44
45#endif

 
 1#ifndef __MMU_H
 2#define __MMU_H
 3
 4#include <linux/cpumask.h>
 5#include <linux/errno.h>
 
 6
 7typedef struct {
 
 8	cpumask_t cpu_attach_mask;
 9	atomic_t flush_count;
10	unsigned int flush_mm;
11	spinlock_t pgtable_lock;
12	struct list_head pgtable_list;
13	spinlock_t gmap_lock;
14	struct list_head gmap_list;
15	unsigned long gmap_asce;
16	unsigned long asce;
17	unsigned long asce_limit;
18	unsigned long vdso_base;
19	/* The mmu context allocates 4K page tables. */
 
 
 
 
 
 
 
 
20	unsigned int alloc_pgste:1;
21	/* The mmu context uses extended page tables. */
22	unsigned int has_pgste:1;
23	/* The mmu context uses storage keys. */
24	unsigned int use_skey:1;
 
 
 
 
25} mm_context_t;
26
27#define INIT_MM_CONTEXT(name)						   \
28	.context.pgtable_lock =						   \
29			__SPIN_LOCK_UNLOCKED(name.context.pgtable_lock),   \
30	.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
31	.context.gmap_lock = __SPIN_LOCK_UNLOCKED(name.context.gmap_lock), \
32	.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
33
34static inline int tprot(unsigned long addr)
35{
36	int rc = -EFAULT;
37
38	asm volatile(
39		"	tprot	0(%1),0\n"
40		"0:	ipm	%0\n"
41		"	srl	%0,28\n"
42		"1:\n"
43		EX_TABLE(0b,1b)
44		: "+d" (rc) : "a" (addr) : "cc");
45	return rc;
46}
47
48#endif