arch/arm64/include/asm/proc-fns.h

   1 /*
   2  * Based on arch/arm/include/asm/proc-fns.h
   3  *
   4  * Copyright (C) 1997-1999 Russell King
   5  * Copyright (C) 2000 Deep Blue Solutions Ltd
   6  * Copyright (C) 2012 ARM Ltd.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20 #ifndef __ASM_PROCFNS_H
  21 #define __ASM_PROCFNS_H
  22
  23 #ifdef __KERNEL__
  24 #ifndef __ASSEMBLY__
  25
  26 #include <asm/page.h>
  27
  28 struct mm_struct;
  29
  30 extern void cpu_cache_off(void);
  31 extern void cpu_do_idle(void);
  32 extern void cpu_do_switch_mm(unsigned long pgd_phys, struct mm_struct *mm);
  33 extern void cpu_reset(unsigned long addr) __attribute__((noreturn));
  34
  35 #include <asm/memory.h>
  36
  37 #define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
  38
  39 #define cpu_get_pgd()                                   \
  40 ({                                                      \
  41         unsigned long pg;                               \
  42         asm("mrs        %0, ttbr0_el1\n"                \
  43             : "=r" (pg));                               \
  44         pg &= ~0xffff000000003ffful;                    \
  45         (pgd_t *)phys_to_virt(pg);                      \
  46 })
  47
  48 #endif /* __ASSEMBLY__ */
  49 #endif /* __KERNEL__ */
  50 #endif /* __ASM_PROCFNS_H */