mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 04:45:23 +07:00
fc0e1299da
In order for code such as TLB invalidation to operate efficiently when the decision to map the kernel at EL0 is determined at runtime, this patch introduces a helper function, arm64_kernel_unmapped_at_el0, to determine whether or not the kernel is mapped whilst running in userspace. Currently, this just reports the value of CONFIG_UNMAP_KERNEL_AT_EL0, but will later be hooked up to a fake CPU capability using a static key. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Laura Abbott <labbott@redhat.com> Tested-by: Shanker Donthineni <shankerd@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
54 lines
1.6 KiB
C
54 lines
1.6 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 MMCF_AARCH32 0x1 /* mm context flag for AArch32 executables */
|
|
#define USER_ASID_FLAG (UL(1) << 48)
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
typedef struct {
|
|
atomic64_t id;
|
|
void *vdso;
|
|
unsigned long flags;
|
|
} 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);
|
|
}
|
|
|
|
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 page_mappings_only);
|
|
extern void *fixmap_remap_fdt(phys_addr_t dt_phys);
|
|
extern void mark_linear_text_alias_ro(void);
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif
|