arch/powerpc/mm/book3s32/kuap.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #include <asm/kup.h>
   4 #include <asm/smp.h>
   5
   6 void setup_kuap(bool disabled)
   7 {
   8         if (!disabled) {
   9                 update_user_segments(mfsr(0) | SR_KS);
  10                 isync();        /* Context sync required after mtsr() */
  11                 init_mm.context.sr0 |= SR_KS;
  12                 current->thread.sr0 |= SR_KS;
  13         }
  14
  15         if (smp_processor_id() != boot_cpuid)
  16                 return;
  17
  18         if (disabled)
  19                 cur_cpu_spec->mmu_features &= ~MMU_FTR_KUAP;
  20         else
  21                 pr_info("Activating Kernel Userspace Access Protection\n");
  22 }