spl_atf.c
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/*
* Reference to the ARM TF Project,
* plat/arm/common/arm_bl2_setup.c
* Portions copyright (c) 2013-2016, ARM Limited and Contributors. All rights
* reserved.
* Copyright (C) 2016 Rockchip Electronic Co.,Ltd
* Written by Kever Yang <kever.yang@rock-chips.com>
* Copyright (C) 2017 Theobroma Systems Design und Consulting GmbH
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <common.h>
#include <atf_common.h>
#include <errno.h>
#include <spl.h>
static struct bl2_to_bl31_params_mem bl31_params_mem;
static struct bl31_params *bl2_to_bl31_params;
/**
* bl2_plat_get_bl31_params() - prepare params for bl31.
*
* This function assigns a pointer to the memory that the platform has kept
* aside to pass platform specific and trusted firmware related information
* to BL31. This memory is allocated by allocating memory to
* bl2_to_bl31_params_mem structure which is a superset of all the
* structure whose information is passed to BL31
* NOTE: This function should be called only once and should be done
* before generating params to BL31
*
* @return bl31 params structure pointer
*/
static struct bl31_params *bl2_plat_get_bl31_params(uintptr_t bl33_entry)
{
struct entry_point_info *bl33_ep_info;
/*
* Initialise the memory for all the arguments that needs to
* be passed to BL31
*/
memset(&bl31_params_mem, 0, sizeof(struct bl2_to_bl31_params_mem));
/* Assign memory for TF related information */
bl2_to_bl31_params = &bl31_params_mem.bl31_params;
SET_PARAM_HEAD(bl2_to_bl31_params, ATF_PARAM_BL31, ATF_VERSION_1, 0);
/* Fill BL31 related information */
SET_PARAM_HEAD(bl2_to_bl31_params->bl31_image_info,
ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
/* Fill BL32 related information if it exists */
bl2_to_bl31_params->bl32_ep_info = &bl31_params_mem.bl32_ep_info;
SET_PARAM_HEAD(bl2_to_bl31_params->bl32_ep_info, ATF_PARAM_EP,
ATF_VERSION_1, 0);
bl2_to_bl31_params->bl32_image_info = &bl31_params_mem.bl32_image_info;
SET_PARAM_HEAD(bl2_to_bl31_params->bl32_image_info,
ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
#ifndef BL32_BASE
bl2_to_bl31_params->bl32_ep_info->pc = 0;
#endif /* BL32_BASE */
/* Fill BL33 related information */
bl2_to_bl31_params->bl33_ep_info = &bl31_params_mem.bl33_ep_info;
bl33_ep_info = &bl31_params_mem.bl33_ep_info;
SET_PARAM_HEAD(bl33_ep_info, ATF_PARAM_EP, ATF_VERSION_1,
ATF_EP_NON_SECURE);
/* BL33 expects to receive the primary CPU MPID (through x0) */
bl33_ep_info->args.arg0 = 0xffff & read_mpidr();
bl33_ep_info->pc = bl33_entry;
bl33_ep_info->spsr = SPSR_64(MODE_EL2, MODE_SP_ELX,
DISABLE_ALL_EXECPTIONS);
bl2_to_bl31_params->bl33_image_info = &bl31_params_mem.bl33_image_info;
SET_PARAM_HEAD(bl2_to_bl31_params->bl33_image_info,
ATF_PARAM_IMAGE_BINARY, ATF_VERSION_1, 0);
return bl2_to_bl31_params;
}
static inline void raw_write_daif(unsigned int daif)
{
__asm__ __volatile__("msr DAIF, %0\n\t" : : "r" (daif) : "memory");
}
typedef void (*atf_entry_t)(struct bl31_params *params, void *plat_params);
static void bl31_entry(uintptr_t bl31_entry, uintptr_t bl33_entry,
uintptr_t fdt_addr)
{
struct bl31_params *bl31_params;
atf_entry_t atf_entry = (atf_entry_t)bl31_entry;
bl31_params = bl2_plat_get_bl31_params(bl33_entry);
raw_write_daif(SPSR_EXCEPTION_MASK);
dcache_disable();
atf_entry((void *)bl31_params, (void *)fdt_addr);
}
static int spl_fit_images_find_uboot(void *blob)
{
int parent, node, ndepth;
const void *data;
if (!blob)
return -FDT_ERR_BADMAGIC;
parent = fdt_path_offset(blob, "/fit-images");
if (parent < 0)
return -FDT_ERR_NOTFOUND;
for (node = fdt_next_node(blob, parent, &ndepth);
(node >= 0) && (ndepth > 0);
node = fdt_next_node(blob, node, &ndepth)) {
if (ndepth != 1)
continue;
data = fdt_getprop(blob, node, FIT_OS_PROP, NULL);
if (!data)
continue;
if (genimg_get_os_id(data) == IH_OS_U_BOOT)
return node;
};
return -FDT_ERR_NOTFOUND;
}
uintptr_t spl_fit_images_get_entry(void *blob, int node)
{
ulong val;
val = fdt_getprop_u32(blob, node, "entry-point");
if (val == FDT_ERROR)
val = fdt_getprop_u32(blob, node, "load-addr");
debug("%s: entry point 0x%lx\n", __func__, val);
return val;
}
void spl_invoke_atf(struct spl_image_info *spl_image)
{
uintptr_t bl33_entry = CONFIG_SYS_TEXT_BASE;
void *blob = spl_image->fdt_addr;
uintptr_t platform_param = (uintptr_t)blob;
int node;
/*
* Find the U-Boot binary (in /fit-images) load addreess or
* entry point (if different) and pass it as the BL3-3 entry
* point.
* This will need to be extended to support Falcon mode.
*/
node = spl_fit_images_find_uboot(blob);
if (node >= 0)
bl33_entry = spl_fit_images_get_entry(blob, node);
/*
* If ATF_NO_PLATFORM_PARAM is set, we override the platform
* parameter and always pass 0. This is a workaround for
* older ATF versions that have insufficiently robust (or
* overzealous) argument validation.
*/
if (CONFIG_IS_ENABLED(ATF_NO_PLATFORM_PARAM))
platform_param = 0;
/*
* We don't provide a BL3-2 entry yet, but this will be possible
* using similar logic.
*/
bl31_entry(spl_image->entry_point, bl33_entry, platform_param);
}