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 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_bits;
 
15	unsigned long asce_limit;
16	unsigned long vdso_base;
17	/* The mmu context has extended page tables. */
 
 
 
 
 
 
 
 
 
 
18	unsigned int has_pgste:1;
 
 
 
 
 
 
19} mm_context_t;
20
21#define INIT_MM_CONTEXT(name)						      \
22	.context.list_lock    = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
23	.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list),    \
24	.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
25
26static inline int tprot(unsigned long addr)
27{
28	int rc = -EFAULT;
29
30	asm volatile(
31		"	tprot	0(%1),0\n"
32		"0:	ipm	%0\n"
33		"	srl	%0,28\n"
34		"1:\n"
35		EX_TABLE(0b,1b)
36		: "+d" (rc) : "a" (addr) : "cc");
37	return rc;
38}
39
40#endif