ulp: Added ULP RISC-V support for esp32s3

This commit adds support for ULP RISC-V for esp32s3.

Signed-off-by: Sudeep Mohanty <sudeep.mohanty@espressif.com>

components/ulp/include/esp32s3/ulp_riscv.h

@@ -0,0 +1,43 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include "esp_err.h"
+#include "ulp_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Run the program loaded into RTC memory
+ * @return  ESP_OK on success
+ */
+esp_err_t ulp_riscv_run(void);
+
+/**
+ * @brief Load ULP-RISC-V program binary into RTC memory
+ *
+ * Different than ULP FSM, the binary program has no special format, it is the ELF
+ * file generated by RISC-V toolchain converted to binary format using objcopy.
+ *
+ * Linker script in components/ulp/ld/esp32s3.ulp.riscv.ld produces ELF files which
+ * correspond to this format. This linker script produces binaries with load_addr == 0.
+ *
+ * @param program_binary pointer to program binary
+ * @param program_size_bytes size of the program binary
+ * @return
+ *      - ESP_OK on success
+ *      - ESP_ERR_INVALID_SIZE if program_size_bytes is more than 8KiB
+ */
+esp_err_t ulp_riscv_load_binary(const uint8_t* program_binary, size_t program_size_bytes);
+
+#ifdef __cplusplus
+}
+#endif