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+/*
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+ * File : stack.c
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+ * This file is part of RT-Thread RTOS
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+ * COPYRIGHT (C) 2006, RT-Thread Development Team
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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+ *
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+ * Change Logs:
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+ * Date Author Notes
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+ * 2017-07-31 tanek first implementation
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+ */
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+
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+#include <rtthread.h>
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+
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+/* flag in interrupt handling */
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+rt_uint32_t rt_interrupt_from_thread;
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+rt_uint32_t rt_interrupt_to_thread;
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+rt_uint32_t rt_thread_switch_interrupt_flag;
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+
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+struct stack_frame
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+{
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+ rt_ubase_t epc; /* epc - epc - program counter */
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+ rt_ubase_t ra; /* x1 - ra - return address for jumps */
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+ rt_ubase_t mstatus; /* - machine status register */
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+ rt_ubase_t gp; /* x3 - gp - global pointer */
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+ rt_ubase_t tp; /* x4 - tp - thread pointer */
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+ rt_ubase_t t0; /* x5 - t0 - temporary register 0 */
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+ rt_ubase_t t1; /* x6 - t1 - temporary register 1 */
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+ rt_ubase_t t2; /* x7 - t2 - temporary register 2 */
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+ rt_ubase_t s0_fp; /* x8 - s0/fp - saved register 0 or frame pointer */
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+ rt_ubase_t s1; /* x9 - s1 - saved register 1 */
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+ rt_ubase_t a0; /* x10 - a0 - return value or function argument 0 */
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+ rt_ubase_t a1; /* x11 - a1 - return value or function argument 1 */
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+ rt_ubase_t a2; /* x12 - a2 - function argument 2 */
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+ rt_ubase_t a3; /* x13 - a3 - function argument 3 */
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+ rt_ubase_t a4; /* x14 - a4 - function argument 4 */
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+ rt_ubase_t a5; /* x15 - a5 - function argument 5 */
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+ rt_ubase_t a6; /* x16 - a6 - function argument 6 */
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+ rt_ubase_t a7; /* x17 - s7 - function argument 7 */
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+ rt_ubase_t s2; /* x18 - s2 - saved register 2 */
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+ rt_ubase_t s3; /* x19 - s3 - saved register 3 */
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+ rt_ubase_t s4; /* x20 - s4 - saved register 4 */
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+ rt_ubase_t s5; /* x21 - s5 - saved register 5 */
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+ rt_ubase_t s6; /* x22 - s6 - saved register 6 */
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+ rt_ubase_t s7; /* x23 - s7 - saved register 7 */
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+ rt_ubase_t s8; /* x24 - s8 - saved register 8 */
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+ rt_ubase_t s9; /* x25 - s9 - saved register 9 */
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+ rt_ubase_t s10; /* x26 - s10 - saved register 10 */
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+ rt_ubase_t s11; /* x27 - s11 - saved register 11 */
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+ rt_ubase_t t3; /* x28 - t3 - temporary register 3 */
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+ rt_ubase_t t4; /* x29 - t4 - temporary register 4 */
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+ rt_ubase_t t5; /* x30 - t5 - temporary register 5 */
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+ rt_ubase_t t6; /* x31 - t6 - temporary register 6 */
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+};
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+
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+/**
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+ * This function will initialize thread stack
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+ *
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+ * @param tentry the entry of thread
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+ * @param parameter the parameter of entry
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+ * @param stack_addr the beginning stack address
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+ * @param texit the function will be called when thread exit
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+ *
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+ * @return stack address
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+ */
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+rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
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+ rt_uint8_t *stack_addr, void *texit)
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+{
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+ struct stack_frame *stack_frame;
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+ rt_uint8_t *stk;
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+ int i;
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+
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+ stk = stack_addr + sizeof(rt_uint32_t);
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+ stk = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stk, 8);
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+ stk -= sizeof(struct stack_frame);
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+
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+ stack_frame = (struct stack_frame *)stk;
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+
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+ for (i = 0; i < sizeof(struct stack_frame) / sizeof(rt_ubase_t); i++)
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+ {
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+ ((rt_ubase_t *)stack_frame)[i] = 0xdeadbeef;
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+ }
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+
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+ stack_frame->ra = (rt_ubase_t)texit;
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+ stack_frame->a0 = (rt_ubase_t)parameter;
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+ stack_frame->epc = (rt_ubase_t)tentry;
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+
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+ // force to machine mode(MPP=11) and set MPIE to 1
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+ stack_frame->mstatus = 0x00001880;
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+
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+ return stk;
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+}
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liang yongxiang