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/*
* Copyright (c) 2006-2025, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018-10-28 Bernard The unify RISC-V porting code.
* 2021-02-11 lizhirui add gp support
* 2021-11-19 JasonHu add fpu support
* 2025-04-20 GuEe-GUI Port for CPU ID
*/
#include <rtthread.h>
#include <cpu.h>
#include <csr.h>
#include <stack.h>
#include <cpuport.h>
#ifdef ARCH_MM_MMU
#include <mmu.h>
#endif
/**
* This function will initialize thread stack, we assuming
* when scheduler restore this new thread, context will restore
* an entry to user first application
*
* s0-s11, ra, sstatus, a0
* @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 *sp;
rt_hw_switch_frame_t frame;
/* We use a strict alignment requirement for Q extension */
sp = (rt_ubase_t *)RT_ALIGN_DOWN((rt_ubase_t)stack_addr, 16);
*(--sp) = (rt_ubase_t)tentry;
*(--sp) = (rt_ubase_t)parameter;
*(--sp) = (rt_ubase_t)texit;
/* Alignment */
--sp;
frame = (rt_hw_switch_frame_t)((rt_ubase_t)sp - sizeof(*frame));
rt_memset(frame, 0, sizeof(*frame));
frame->regs[RT_HW_SWITCH_CONTEXT_RA] = (rt_ubase_t)_thread_start;
frame->regs[RT_HW_SWITCH_CONTEXT_XSTATUS] = K_XSTATUS_DEFAULT;
/* Bare SMP keeps the current hart's tp across context switches. */
return (void *)frame;
}
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