common/spl/spl_atf.c

   1 /*
   2  * Reference to the ARM TF Project,
   3  * plat/arm/common/arm_bl2_setup.c
   4  * Portions copyright (c) 2013-2016, ARM Limited and Contributors. All rights
   5  * reserved.
   6  * Copyright (C) 2016 Rockchip Electronic Co.,Ltd
   7  * Written by Kever Yang <kever.yang@rock-chips.com>
   8  *
   9  * SPDX-License-Identifier:     BSD-3-Clause
  10  */
  11
  12 #include <common.h>
  13 #include <atf_common.h>
  14 #include <errno.h>
  15 #include <spl.h>
  16
  17 static struct bl2_to_bl31_params_mem bl31_params_mem;
  18 static struct bl31_params *bl2_to_bl31_params;
  19
  20 /**
  21  * bl2_plat_get_bl31_params() - prepare params for bl31.
  22  *
  23  * This function assigns a pointer to the memory that the platform has kept
  24  * aside to pass platform specific and trusted firmware related information
  25  * to BL31. This memory is allocated by allocating memory to
  26  * bl2_to_bl31_params_mem structure which is a superset of all the
  27  * structure whose information is passed to BL31
  28  * NOTE: This function should be called only once and should be done
  29  * before generating params to BL31
  30  *
  31  * @return bl31 params structure pointer
  32  */
  33 struct bl31_params *bl2_plat_get_bl31_params(void)
  34 {
  35         struct entry_point_info *bl33_ep_info;
  36
  37         /*
  38          * Initialise the memory for all the arguments that needs to
  39          * be passed to BL31
  40          */
  41         memset(&bl31_params_mem, 0, sizeof(struct bl2_to_bl31_params_mem));
  42
  43         /* Assign memory for TF related information */
  44         bl2_to_bl31_params = &bl31_params_mem.bl31_params;
  45         SET_PARAM_HEAD(bl2_to_bl31_params, ATF_PARAM_BL31, ATF_VERSION_1, 0);
  46
  47         /* Fill BL31 related information */
  48         SET_PARAM_HEAD(bl2_to_bl31_params->bl31_image_info,
  49                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  50
  51         /* Fill BL32 related information if it exists */
  52 #ifdef BL32_BASE
  53         bl2_to_bl31_params->bl32_ep_info = &bl31_params_mem.bl32_ep_info;
  54         SET_PARAM_HEAD(bl2_to_bl31_params->bl32_ep_info, ATF_PARAM_EP,
  55                        ATF_VERSION_1, 0);
  56         bl2_to_bl31_params->bl32_image_info = &bl31_params_mem.bl32_image_info;
  57         SET_PARAM_HEAD(bl2_to_bl31_params->bl32_image_info,
  58                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  59 #endif /* BL32_BASE */
  60
  61         /* Fill BL33 related information */
  62         bl2_to_bl31_params->bl33_ep_info = &bl31_params_mem.bl33_ep_info;
  63         bl33_ep_info = &bl31_params_mem.bl33_ep_info;
  64         SET_PARAM_HEAD(bl33_ep_info, ATF_PARAM_EP, ATF_VERSION_1,
  65                        ATF_EP_NON_SECURE);
  66
  67         /* BL33 expects to receive the primary CPU MPID (through x0) */
  68         bl33_ep_info->args.arg0 = 0xffff & read_mpidr();
  69         bl33_ep_info->pc = CONFIG_SYS_TEXT_BASE;
  70         bl33_ep_info->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX,
  71                                      DISABLE_ALL_EXECPTIONS);
  72
  73         bl2_to_bl31_params->bl33_image_info = &bl31_params_mem.bl33_image_info;
  74         SET_PARAM_HEAD(bl2_to_bl31_params->bl33_image_info,
  75                        ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
  76
  77         return bl2_to_bl31_params;
  78 }
  79
  80 void raw_write_daif(unsigned int daif)
  81 {
  82         __asm__ __volatile__("msr DAIF, %0\n\t" : : "r" (daif) : "memory");
  83 }
  84
  85 void bl31_entry(void)
  86 {
  87         struct bl31_params *bl31_params;
  88         void (*entry)(struct bl31_params *params, void *plat_params) = NULL;
  89
  90         bl31_params = bl2_plat_get_bl31_params();
  91         entry = (void *)CONFIG_SPL_ATF_TEXT_BASE;
  92
  93         raw_write_daif(SPSR_EXCEPTION_MASK);
  94         dcache_disable();
  95
  96         entry(bl31_params, NULL);
  97 }