Merge branch 'feature/add_bignum_ll_layer' into 'master'

bignum: added bignum hal and ll layer

Closes IDF-7071

See merge request espressif/esp-idf!22823

components/hal/esp32s2/include/hal/mpi_ll.h

@@ -0,0 +1,151 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdbool.h>
+#include <string.h>
+#include "hal/assert.h"
+#include "soc/hwcrypto_periph.h"
+#include "soc/dport_reg.h"
+#include "soc/mpi_periph.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline size_t mpi_ll_calculate_hardware_words(size_t words)
+{
+    return words;
+}
+
+static inline void mpi_ll_clear_power_control_bit(void)
+{
+    REG_CLR_BIT(DPORT_RSA_PD_CTRL_REG, DPORT_RSA_MEM_PD);
+}
+
+static inline void mpi_ll_set_power_control_bit(void)
+{
+    REG_SET_BIT(DPORT_RSA_PD_CTRL_REG, DPORT_RSA_PD);
+}
+
+static inline void mpi_ll_enable_interrupt(void)
+{
+    REG_WRITE(RSA_INTERRUPT_REG, 1);
+}
+
+static inline void mpi_ll_disable_interrupt(void)
+{
+    REG_WRITE(RSA_INTERRUPT_REG, 0);
+}
+
+static inline void mpi_ll_clear_interrupt(void)
+{
+    REG_WRITE(RSA_CLEAR_INTERRUPT_REG, 1);
+}
+
+static inline bool mpi_ll_check_memory_init_complete(void)
+{
+    return REG_READ(RSA_QUERY_CLEAN_REG) == 0;
+}
+
+static inline void mpi_ll_start_op(mpi_op_t op)
+{
+    REG_WRITE(MPI_LL_OPERATIONS[op], 1);
+}
+
+static inline bool mpi_ll_get_int_status(void)
+{
+    return REG_READ(RSA_QUERY_INTERRUPT_REG) == 0;
+}
+
+/* Copy MPI bignum (p) to hardware memory block at 'mem_base'.
+
+   If num_words is higher than the number of words (n) in the bignum then
+   these additional words will be zeroed in the memory buffer.
+*/
+static inline void mpi_ll_write_to_mem_block(mpi_param_t param, size_t offset, const uint32_t* p, size_t n, size_t num_words)
+{
+    uint32_t mem_base = MPI_LL_BLOCK_BASES[param] + offset;
+    uint32_t* pbase = (uint32_t*) mem_base;
+    uint32_t copy_words = MIN(num_words, n);
+
+    /* Copy MPI data to memory block registers */
+    for (int i = 0; i < copy_words; i++) {
+        pbase[i] = p[i];
+    }
+
+    /* Zero any remaining memory block data */
+    for (int i = copy_words; i < num_words; i++) {
+        pbase[i] = 0;
+    }
+}
+
+static inline void mpi_ll_write_m_prime(uint32_t Mprime)
+{
+    REG_WRITE(RSA_M_DASH_REG, Mprime);
+}
+
+static inline void mpi_ll_write_rinv(uint32_t rinv)
+{
+    REG_WRITE(MPI_LL_BLOCK_BASES[MPI_PARAM_Z], rinv);
+}
+
+static inline void mpi_ll_write_at_offset(mpi_param_t param, int offset, uint32_t value)
+{
+    uint32_t mem_base = MPI_LL_BLOCK_BASES[param] + offset;
+    REG_WRITE(mem_base, value);
+}
+
+/* Read MPI bignum (p) back from hardware memory block.
+
+   Reads z_words words from block.
+*/
+static inline void mpi_ll_read_from_mem_block(uint32_t* p, size_t n, size_t num_words)
+{
+    uint32_t mem_base = MPI_LL_BLOCK_BASES[MPI_PARAM_Z];
+    /* Copy data from memory block registers */
+    esp_dport_access_read_buffer(p, mem_base, num_words);
+
+    /* Zero any remaining limbs in the bignum, if the buffer is bigger
+       than num_words */
+    for (size_t i = num_words; i < n; i++) {
+        p[i] = 0;
+    }
+}
+
+static inline void mpi_ll_set_mode(size_t length)
+{
+    REG_WRITE(RSA_LENGTH_REG, length);
+}
+
+static inline void mpi_ll_disable_constant_time(void)
+{
+    REG_WRITE(RSA_CONSTANT_TIME_REG, 0);
+}
+
+static inline void mpi_ll_enable_constant_time(void)
+{
+    REG_WRITE(RSA_CONSTANT_TIME_REG, 1);
+}
+
+static inline void mpi_ll_disable_search(void)
+{
+    REG_WRITE(RSA_SEARCH_OPEN_REG, 0);
+}
+
+static inline void mpi_ll_enable_search(void)
+{
+    REG_WRITE(RSA_SEARCH_OPEN_REG, 1);
+}
+
+static inline void mpi_ll_set_search_position(size_t pos)
+{
+    REG_WRITE(RSA_SEARCH_POS_REG, pos);
+}
+
+#ifdef __cplusplus
+}
+#endif