100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2012 ARM Ltd.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
#ifndef __ASM_MMU_H
|
||
|
|
#define __ASM_MMU_H
|
||
|
|
|
||
|
|
|
||
|
|
#define USER_ASID_FLAG (UL(1) << 48)
|
||
|
|
#define TTBR_ASID_MASK (UL(0xffff) << 48)
|
||
|
|
|
||
|
|
#ifndef __ASSEMBLY__
|
||
|
|
|
||
|
|
#include <linux/percpu.h>
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
atomic64_t id;
|
||
|
|
void *vdso;
|
||
|
|
} mm_context_t;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This macro is only used by the TLBI code, which cannot race with an
|
||
|
|
* ASID change and therefore doesn't need to reload the counter using
|
||
|
|
* atomic64_read.
|
||
|
|
*/
|
||
|
|
#define ASID(mm) ((mm)->context.id.counter & 0xffff)
|
||
|
|
|
||
|
|
static inline bool arm64_kernel_unmapped_at_el0(void)
|
||
|
|
{
|
||
|
|
return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0) &&
|
||
|
|
cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0);
|
||
|
|
}
|
||
|
|
|
||
|
|
typedef void (*bp_hardening_cb_t)(void);
|
||
|
|
|
||
|
|
struct bp_hardening_data {
|
||
|
|
int hyp_vectors_slot;
|
||
|
|
bp_hardening_cb_t fn;
|
||
|
|
};
|
||
|
|
|
||
|
|
#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
|
||
|
|
extern char __bp_harden_hyp_vecs_start[], __bp_harden_hyp_vecs_end[];
|
||
|
|
|
||
|
|
DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
|
||
|
|
|
||
|
|
static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
|
||
|
|
{
|
||
|
|
return this_cpu_ptr(&bp_hardening_data);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void arm64_apply_bp_hardening(void)
|
||
|
|
{
|
||
|
|
struct bp_hardening_data *d;
|
||
|
|
|
||
|
|
if (!cpus_have_cap(ARM64_HARDEN_BRANCH_PREDICTOR))
|
||
|
|
return;
|
||
|
|
|
||
|
|
d = arm64_get_bp_hardening_data();
|
||
|
|
if (d->fn)
|
||
|
|
d->fn();
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
|
||
|
|
{
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void arm64_apply_bp_hardening(void) { }
|
||
|
|
#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */
|
||
|
|
|
||
|
|
extern void paging_init(void);
|
||
|
|
extern void bootmem_init(void);
|
||
|
|
extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
|
||
|
|
extern void init_mem_pgprot(void);
|
||
|
|
extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
|
||
|
|
unsigned long virt, phys_addr_t size,
|
||
|
|
pgprot_t prot, bool allow_block_mappings);
|
||
|
|
extern void *fixmap_remap_fdt(phys_addr_t dt_phys);
|
||
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
||
|
|
extern void hotplug_paging(phys_addr_t start, phys_addr_t size);
|
||
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
||
|
|
extern void remove_pagetable(unsigned long start,
|
||
|
|
unsigned long end, bool direct);
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* !__ASSEMBLY__ */
|
||
|
|
#endif
|