blob: a9efc52b8231f7b06907750e3cb4795719893604 [file] [log] [blame]
/*
* Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <libfdt.h>
#include <platform_def.h>
#include <common/bl_common.h>
#include <lib/xlat_tables/xlat_mmu_helpers.h>
#include <lib/xlat_tables/xlat_tables_defs.h>
#include <plat/common/platform.h>
#include <rpi_shared.h>
/*
* Placeholder variables for copying the arguments that have been passed to
* BL31 from BL2.
*/
static entry_point_info_t bl32_image_ep_info;
static entry_point_info_t bl33_image_ep_info;
/*******************************************************************************
* Return a pointer to the 'entry_point_info' structure of the next image for
* the security state specified. BL33 corresponds to the non-secure image type
* while BL32 corresponds to the secure image type. A NULL pointer is returned
* if the image does not exist.
******************************************************************************/
entry_point_info_t *bl31_plat_get_next_image_ep_info(uint32_t type)
{
entry_point_info_t *next_image_info;
assert(sec_state_is_valid(type) != 0);
next_image_info = (type == NON_SECURE)
? &bl33_image_ep_info : &bl32_image_ep_info;
/* None of the images can have 0x0 as the entrypoint. */
if (next_image_info->pc) {
return next_image_info;
} else {
return NULL;
}
}
/*******************************************************************************
* Perform any BL31 early platform setup. Here is an opportunity to copy
* parameters passed by the calling EL (S-EL1 in BL2 & EL3 in BL1) before
* they are lost (potentially). This needs to be done before the MMU is
* initialized so that the memory layout can be used while creating page
* tables. BL2 has flushed this information to memory, so we are guaranteed
* to pick up good data.
******************************************************************************/
void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
u_register_t arg2, u_register_t arg3)
{
/* Initialize the console to provide early debug support */
rpi3_console_init();
/*
* In debug builds, a special value is passed in 'arg1' to verify
* platform parameters from BL2 to BL31. Not used in release builds.
*/
assert(arg1 == RPI3_BL31_PLAT_PARAM_VAL);
/* Check that params passed from BL2 are not NULL. */
bl_params_t *params_from_bl2 = (bl_params_t *) arg0;
assert(params_from_bl2 != NULL);
assert(params_from_bl2->h.type == PARAM_BL_PARAMS);
assert(params_from_bl2->h.version >= VERSION_2);
bl_params_node_t *bl_params = params_from_bl2->head;
/*
* Copy BL33 and BL32 (if present), entry point information.
* They are stored in Secure RAM, in BL2's address space.
*/
while (bl_params) {
if (bl_params->image_id == BL32_IMAGE_ID) {
bl32_image_ep_info = *bl_params->ep_info;
}
if (bl_params->image_id == BL33_IMAGE_ID) {
bl33_image_ep_info = *bl_params->ep_info;
}
bl_params = bl_params->next_params_info;
}
if (bl33_image_ep_info.pc == 0) {
panic();
}
#if RPI3_DIRECT_LINUX_BOOT
# if RPI3_BL33_IN_AARCH32
/*
* According to the file ``Documentation/arm/Booting`` of the Linux
* kernel tree, Linux expects:
* r0 = 0
* r1 = machine type number, optional in DT-only platforms (~0 if so)
* r2 = Physical address of the device tree blob
*/
VERBOSE("rpi3: Preparing to boot 32-bit Linux kernel\n");
bl33_image_ep_info.args.arg0 = 0U;
bl33_image_ep_info.args.arg1 = ~0U;
bl33_image_ep_info.args.arg2 = (u_register_t) RPI3_PRELOADED_DTB_BASE;
# else
/*
* According to the file ``Documentation/arm64/booting.txt`` of the
* Linux kernel tree, Linux expects the physical address of the device
* tree blob (DTB) in x0, while x1-x3 are reserved for future use and
* must be 0.
*/
VERBOSE("rpi3: Preparing to boot 64-bit Linux kernel\n");
bl33_image_ep_info.args.arg0 = (u_register_t) RPI3_PRELOADED_DTB_BASE;
bl33_image_ep_info.args.arg1 = 0ULL;
bl33_image_ep_info.args.arg2 = 0ULL;
bl33_image_ep_info.args.arg3 = 0ULL;
# endif /* RPI3_BL33_IN_AARCH32 */
#endif /* RPI3_DIRECT_LINUX_BOOT */
}
void bl31_plat_arch_setup(void)
{
rpi3_setup_page_tables(BL31_BASE, BL31_END - BL31_BASE,
BL_CODE_BASE, BL_CODE_END,
BL_RO_DATA_BASE, BL_RO_DATA_END
#if USE_COHERENT_MEM
, BL_COHERENT_RAM_BASE, BL_COHERENT_RAM_END
#endif
);
enable_mmu_el3(0);
}
#ifdef RPI3_PRELOADED_DTB_BASE
/*
* Add information to the device tree (if any) about the reserved DRAM used by
* the Trusted Firmware.
*/
static void rpi3_dtb_add_mem_rsv(void)
{
int i, regions, rc;
uint64_t addr, size;
void *dtb = (void *)RPI3_PRELOADED_DTB_BASE;
INFO("rpi3: Checking DTB...\n");
/* Return if no device tree is detected */
if (fdt_check_header(dtb) != 0)
return;
regions = fdt_num_mem_rsv(dtb);
VERBOSE("rpi3: Found %d mem reserve region(s)\n", regions);
/* We expect to find one reserved region that we can modify */
if (regions < 1)
return;
/*
* Look for the region that corresponds to the default boot firmware. It
* starts at address 0, and it is not needed when the default firmware
* is replaced by this port of the Trusted Firmware.
*/
for (i = 0; i < regions; i++) {
if (fdt_get_mem_rsv(dtb, i, &addr, &size) != 0)
continue;
if (addr != 0x0)
continue;
VERBOSE("rpi3: Firmware mem reserve region found\n");
rc = fdt_del_mem_rsv(dtb, i);
if (rc != 0) {
INFO("rpi3: Can't remove mem reserve region (%d)\n", rc);
}
break;
}
if (i == regions) {
VERBOSE("rpi3: Firmware mem reserve region not found\n");
}
/*
* Reserve all SRAM. As said in the documentation, this isn't actually
* secure memory, so it is needed to tell BL33 that this is a reserved
* memory region. It doesn't guarantee it won't use it, though.
*/
rc = fdt_add_mem_rsv(dtb, SEC_SRAM_BASE, SEC_SRAM_SIZE);
if (rc != 0) {
WARN("rpi3: Can't add mem reserve region (%d)\n", rc);
}
INFO("rpi3: Reserved 0x%llx - 0x%llx in DTB\n", SEC_SRAM_BASE,
SEC_SRAM_BASE + SEC_SRAM_SIZE);
}
#endif
void bl31_platform_setup(void)
{
#ifdef RPI3_PRELOADED_DTB_BASE
/* Only modify a DTB if we know where to look for it */
rpi3_dtb_add_mem_rsv();
#endif
}