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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-05-12 RT-Thread init
* 2023-07-13 GuEe-GUI append fpu: Q16 ~ Q31
*/
#include <board.h>
#include <rtthread.h>
#include <cpuport.h>
#include <armv8.h>
#define INITIAL_SPSR_EL1 (PSTATE_EL1 | SP_ELx)
/**
* This function will initialize thread stack
*
* @param tentry the entry of thread
* @param parameter the parameter of entry
* @param stack_addr the beginning stack address
* @param texit the function will be called when thread exit
*
* @return stack address
*/
rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
rt_uint8_t *stack_addr, void *texit)
{
rt_ubase_t *stk;
/* The AAPCS64 requires 128-bit (16 byte) stack alignment */
stk = (rt_ubase_t*)RT_ALIGN_DOWN((rt_ubase_t)stack_addr, 16);
for (int i = 0; i < 32; ++i)
{
stk -= sizeof(rt_uint128_t) / sizeof(rt_ubase_t);
*(rt_uint128_t *)stk = (rt_uint128_t) { 0 };
}
*(--stk) = (rt_ubase_t)0; /* X1 */
*(--stk) = (rt_ubase_t)parameter; /* X0 */
*(--stk) = (rt_ubase_t)3; /* X3 */
*(--stk) = (rt_ubase_t)2; /* X2 */
*(--stk) = (rt_ubase_t)5; /* X5 */
*(--stk) = (rt_ubase_t)4; /* X4 */
*(--stk) = (rt_ubase_t)7; /* X7 */
*(--stk) = (rt_ubase_t)6; /* X6 */
*(--stk) = (rt_ubase_t)9; /* X9 */
*(--stk) = (rt_ubase_t)8; /* X8 */
*(--stk) = (rt_ubase_t)11; /* X11 */
*(--stk) = (rt_ubase_t)10; /* X10 */
*(--stk) = (rt_ubase_t)13; /* X13 */
*(--stk) = (rt_ubase_t)12; /* X12 */
*(--stk) = (rt_ubase_t)15; /* X15 */
*(--stk) = (rt_ubase_t)14; /* X14 */
*(--stk) = (rt_ubase_t)17; /* X17 */
*(--stk) = (rt_ubase_t)16; /* X16 */
*(--stk) = (rt_ubase_t)tentry; /* X19, 1st param */
*(--stk) = (rt_ubase_t)18; /* X18 */
*(--stk) = (rt_ubase_t)21; /* X21 */
*(--stk) = (rt_ubase_t)texit; /* X20, 2nd param */
*(--stk) = (rt_ubase_t)23; /* X23 */
*(--stk) = (rt_ubase_t)22; /* X22 */
*(--stk) = (rt_ubase_t)25; /* X25 */
*(--stk) = (rt_ubase_t)24; /* X24 */
*(--stk) = (rt_ubase_t)27; /* X27 */
*(--stk) = (rt_ubase_t)26; /* X26 */
*(--stk) = (rt_ubase_t)0; /* X29 - addr 0 as AAPCS64 specified */
*(--stk) = (rt_ubase_t)28; /* X28 */
*(--stk) = (rt_ubase_t)0; /* FPSR */
*(--stk) = (rt_ubase_t)0; /* FPCR */
*(--stk) = (rt_ubase_t)0; /* X30 - procedure call link register. */
*(--stk) = (rt_ubase_t)0; /* sp_el0 */
*(--stk) = INITIAL_SPSR_EL1;
*(--stk) = (rt_ubase_t)_thread_start; /* Exception return address. */
/* return task's current stack address */
return (rt_uint8_t *)stk;
}
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