tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 ARM Ltd.
4 */
5#ifndef __ASM_MMU_H
6#define __ASM_MMU_H
7
8#include <asm/cputype.h>
9
10#define MMCF_AARCH32 0x1 /* mm context flag for AArch32 executables */
11#define USER_ASID_BIT 48
12#define USER_ASID_FLAG (UL(1) << USER_ASID_BIT)
13#define TTBR_ASID_MASK (UL(0xffff) << 48)
14
15#ifndef __ASSEMBLY__
16
17#include <linux/refcount.h>
18
19typedef struct {
20 atomic64_t id;
21#ifdef CONFIG_COMPAT
22 void *sigpage;
23#endif
24 refcount_t pinned;
25 void *vdso;
26 unsigned long flags;
27} mm_context_t;
28
29/*
30 * This macro is only used by the TLBI and low-level switch_mm() code,
31 * neither of which can race with an ASID change. We therefore don't
32 * need to reload the counter using atomic64_read().
33 */
34#define ASID(mm) ((mm)->context.id.counter & 0xffff)
35
36static inline bool arm64_kernel_unmapped_at_el0(void)
37{
38 return cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0);
39}
40
41extern void arm64_memblock_init(void);
42extern void paging_init(void);
43extern void bootmem_init(void);
44extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
45extern void init_mem_pgprot(void);
46extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
47 unsigned long virt, phys_addr_t size,
48 pgprot_t prot, bool page_mappings_only);
49extern void *fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot);
50extern void mark_linear_text_alias_ro(void);
51extern bool kaslr_requires_kpti(void);
52
53#define INIT_MM_CONTEXT(name) \
54 .pgd = init_pg_dir,
55
56#endif /* !__ASSEMBLY__ */
57#endif