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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 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 belongs to a secure guest. */
20 atomic_t protected_count;
21 /*
22 * The following bitfields need a down_write on the mm
23 * semaphore when they are written to. As they are only
24 * written once, they can be read without a lock.
25 */
26 /* The mmu context uses extended page tables. */
27 unsigned int has_pgste:1;
28 /* The mmu context uses storage keys. */
29 unsigned int uses_skeys:1;
30 /* The mmu context uses CMM. */
31 unsigned int uses_cmm:1;
32 /*
33 * The mmu context allows COW-sharing of memory pages (KSM, zeropage).
34 * Note that COW-sharing during fork() is currently always allowed.
35 */
36 unsigned int allow_cow_sharing:1;
37 /* The gmaps associated with this context are allowed to use huge pages. */
38 unsigned int allow_gmap_hpage_1m:1;
39} mm_context_t;
40
41#define INIT_MM_CONTEXT(name) \
42 .context.lock = __SPIN_LOCK_UNLOCKED(name.context.lock), \
43 .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
44
45#endif