lib/psci/psci_mem_protect.c

   1 /*
   2  * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
   3  *
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  */
   6
   7 #include <assert.h>
   8 #include <limits.h>
   9
  10 #include <lib/utils.h>
  11
  12 #include "psci_private.h"
  13
  14 u_register_t psci_mem_protect(unsigned int enable)
  15 {
  16         int val;
  17
  18         assert(psci_plat_pm_ops->read_mem_protect != NULL);
  19         assert(psci_plat_pm_ops->write_mem_protect != NULL);
  20
  21         if (psci_plat_pm_ops->read_mem_protect(&val) < 0)
  22                 return (u_register_t) PSCI_E_NOT_SUPPORTED;
  23         if (psci_plat_pm_ops->write_mem_protect(enable) < 0)
  24                 return (u_register_t) PSCI_E_NOT_SUPPORTED;
  25
  26         return (val != 0) ? 1U : 0U;
  27 }
  28
  29 u_register_t psci_mem_chk_range(uintptr_t base, u_register_t length)
  30 {
  31         int ret;
  32
  33         assert(psci_plat_pm_ops->mem_protect_chk != NULL);
  34
  35         if ((length == 0U) || check_uptr_overflow(base, length - 1U))
  36                 return (u_register_t) PSCI_E_DENIED;
  37
  38         ret = psci_plat_pm_ops->mem_protect_chk(base, length);
  39         return (ret < 0) ?
  40                (u_register_t) PSCI_E_DENIED : (u_register_t) PSCI_E_SUCCESS;
  41 }