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 attach_count;
10	unsigned int flush_mm;
11	spinlock_t list_lock;
12	struct list_head pgtable_list;
13	struct list_head gmap_list;
 
14	unsigned long asce;
15	unsigned long asce_limit;
16	unsigned long vdso_base;
17	/* The mmu context allocates 4K page tables. */
 
 
 
 
 
 
18	unsigned int alloc_pgste:1;
19	/* The mmu context uses extended page tables. */
20	unsigned int has_pgste:1;
21	/* The mmu context uses storage keys. */
22	unsigned int use_skey:1;
 
 
 
 
 
 
23} mm_context_t;
24
25#define INIT_MM_CONTEXT(name)						      \
26	.context.list_lock    = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
27	.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list),    \
28	.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
29
30static inline int tprot(unsigned long addr)
31{
32	int rc = -EFAULT;
33
34	asm volatile(
35		"	tprot	0(%1),0\n"
36		"0:	ipm	%0\n"
37		"	srl	%0,28\n"
38		"1:\n"
39		EX_TABLE(0b,1b)
40		: "+d" (rc) : "a" (addr) : "cc");
41	return rc;
42}
43
44#endif

 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
 8typedef struct {
 9	spinlock_t lock;
10	cpumask_t cpu_attach_mask;
11	atomic_t flush_count;
12	unsigned int flush_mm;
 
13	struct list_head pgtable_list;
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	/*
20	 * The following bitfields need a down_write on the mm
21	 * semaphore when they are written to. As they are only
22	 * written once, they can be read without a lock.
23	 *
24	 * The mmu context allocates 4K page tables.
25	 */
26	unsigned int alloc_pgste:1;
27	/* The mmu context uses extended page tables. */
28	unsigned int has_pgste:1;
29	/* The mmu context uses storage keys. */
30	unsigned int uses_skeys:1;
31	/* The mmu context uses CMM. */
32	unsigned int uses_cmm:1;
33	/* The gmaps associated with this context are allowed to use huge pages. */
34	unsigned int allow_gmap_hpage_1m:1;
35	/* The mmu context is for compat task */
36	unsigned int compat_mm:1;
37} mm_context_t;
38
39#define INIT_MM_CONTEXT(name)						   \
40	.context.lock =	__SPIN_LOCK_UNLOCKED(name.context.lock),	   \
41	.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
42	.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
43
44static inline int tprot(unsigned long addr)
45{
46	int rc = -EFAULT;
47
48	asm volatile(
49		"	tprot	0(%1),0\n"
50		"0:	ipm	%0\n"
51		"	srl	%0,28\n"
52		"1:\n"
53		EX_TABLE(0b,1b)
54		: "+d" (rc) : "a" (addr) : "cc");
55	return rc;
56}
57
58#endif