diff options
Diffstat (limited to 'plat/imx/imx8m/imx8m_dyn_cfg_helpers.c')
| -rw-r--r-- | plat/imx/imx8m/imx8m_dyn_cfg_helpers.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/plat/imx/imx8m/imx8m_dyn_cfg_helpers.c b/plat/imx/imx8m/imx8m_dyn_cfg_helpers.c new file mode 100644 index 0000000..5d65ef2 --- /dev/null +++ b/plat/imx/imx8m/imx8m_dyn_cfg_helpers.c @@ -0,0 +1,201 @@ +/* + * Copyright (c) 2022, ARM Limited and Contributors. All rights reserved. + * Copyright (c) 2022, Linaro. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> + +#include <arch_helpers.h> +#if MEASURED_BOOT +#include <common/desc_image_load.h> +#endif +#include <common/fdt_wrappers.h> +#include <libfdt.h> +#include <platform_def.h> + +#define DTB_PROP_HW_LOG_ADDR "tpm_event_log_addr" +#define DTB_PROP_HW_LOG_SIZE "tpm_event_log_size" + +#if MEASURED_BOOT + +static int imx8m_event_log_fdt_init_overlay(uintptr_t dt_base, int dt_size) +{ + int ret; + int offset; + void *dtb = (void *)dt_base; + + ret = fdt_create_empty_tree(dtb, dt_size); + if (ret < 0) { + ERROR("cannot create empty dtb tree: %s\n", + fdt_strerror(ret)); + return ret; + } + + offset = fdt_path_offset(dtb, "/"); + if (offset < 0) { + ERROR("cannot find root of the tree: %s\n", + fdt_strerror(offset)); + return offset; + } + + offset = fdt_add_subnode(dtb, offset, "fragment@0"); + if (offset < 0) { + ERROR("cannot add fragment node: %s\n", + fdt_strerror(offset)); + return offset; + } + + ret = fdt_setprop_string(dtb, offset, "target-path", "/"); + if (ret < 0) { + ERROR("cannot set target-path property: %s\n", + fdt_strerror(ret)); + return ret; + } + + offset = fdt_add_subnode(dtb, offset, "__overlay__"); + if (offset < 0) { + ERROR("cannot add __overlay__ node: %s\n", + fdt_strerror(offset)); + return ret; + } + + offset = fdt_add_subnode(dtb, offset, "tpm_event_log"); + if (offset < 0) { + ERROR("cannot add tpm_event_log node: %s\n", + fdt_strerror(offset)); + return offset; + } + + ret = fdt_setprop_string(dtb, offset, "compatible", + "arm,tpm_event_log"); + if (ret < 0) { + ERROR("cannot set compatible property: %s\n", + fdt_strerror(ret)); + return ret; + } + + ret = fdt_setprop_u64(dtb, offset, "tpm_event_log_addr", 0); + if (ret < 0) { + ERROR("cannot set tpm_event_log_addr property: %s\n", + fdt_strerror(ret)); + return ret; + } + + ret = fdt_setprop_u32(dtb, offset, "tpm_event_log_size", 0); + if (ret < 0) { + ERROR("cannot set tpm_event_log_size property: %s\n", + fdt_strerror(ret)); + return ret; + } + + return ret; +} + +/* + * Write the Event Log address and its size in the DTB. + * + * This function is supposed to be called only by BL2. + * + * Returns: + * 0 = success + * < 0 = error + */ +static int imx8m_set_event_log_info(uintptr_t config_base, + uintptr_t log_addr, size_t log_size) +{ + /* As libfdt uses void *, we can't avoid this cast */ + void *dtb = (void *)config_base; + const char *compatible_tpm = "arm,tpm_event_log"; + uint64_t base = cpu_to_fdt64(log_addr); + uint32_t sz = cpu_to_fdt32(log_size); + int err, node; + + err = fdt_open_into(dtb, dtb, PLAT_IMX8M_DTO_MAX_SIZE); + if (err < 0) { + ERROR("Invalid Device Tree at %p: error %d\n", dtb, err); + return err; + } + + /* + * Verify that the DTB is valid, before attempting to write to it, + * and get the DTB root node. + */ + + /* Check if the pointer to DT is correct */ + err = fdt_check_header(dtb); + if (err < 0) { + WARN("Invalid DTB file passed\n"); + return err; + } + + /* + * Find the TPM node in device tree. + */ + node = fdt_node_offset_by_compatible(dtb, -1, compatible_tpm); + if (node < 0) { + ERROR("The compatible property '%s' not%s", compatible_tpm, + " found in the config\n"); + return node; + } + + err = fdt_setprop(dtb, node, DTB_PROP_HW_LOG_ADDR, &base, 8); + if (err < 0) { + ERROR("Failed to add log addr err %d\n", err); + return err; + } + + err = fdt_setprop(dtb, node, DTB_PROP_HW_LOG_SIZE, &sz, 4); + if (err < 0) { + ERROR("Failed to add log addr err %d\n", err); + return err; + } + + err = fdt_pack(dtb); + if (err < 0) { + ERROR("Failed to pack Device Tree at %p: error %d\n", dtb, err); + return err; + } + + /* + * Ensure that the info written to the DTB is visible + * to other images. + */ + flush_dcache_range(config_base, fdt_totalsize(dtb)); + + return err; +} + +/* + * This function writes the Event Log address and its size + * in the QEMU DTB. + * + * This function is supposed to be called only by BL2. + * + * Returns: + * 0 = success + * < 0 = error + */ +int imx8m_set_nt_fw_info(size_t log_size, uintptr_t *ns_log_addr) +{ + uintptr_t ns_addr; + int err; + + assert(ns_log_addr != NULL); + + ns_addr = PLAT_IMX8M_DTO_BASE + PLAT_IMX8M_DTO_MAX_SIZE; + + imx8m_event_log_fdt_init_overlay(PLAT_IMX8M_DTO_BASE, + PLAT_IMX8M_DTO_MAX_SIZE); + + /* Write the Event Log address and its size in the DTB */ + err = imx8m_set_event_log_info(PLAT_IMX8M_DTO_BASE, + ns_addr, log_size); + + /* Return Event Log address in Non-secure memory */ + *ns_log_addr = (err < 0) ? 0UL : ns_addr; + return err; +} + +#endif /* MEASURED_BOOT */ |