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-rw-r--r--plat/rpi/rpi3/rpi3_bl31_setup.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/plat/rpi/rpi3/rpi3_bl31_setup.c b/plat/rpi/rpi3/rpi3_bl31_setup.c
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index 0000000000..2f1bc6493e
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+++ b/plat/rpi/rpi3/rpi3_bl31_setup.c
@@ -0,0 +1,214 @@
+/*
+ * Copyright (c) 2015-2018, 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 "rpi3_private.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
+}