/* * Copyright (c) 2006-2018, RT-Thread Development Team * Copyright (c) 2021, Alibaba Group Holding Limited * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2020/08/20 zx.chen The T-HEAD RISC-V CPU E906 porting implementation * 2021/08/13 zx.chen update T-HEAD E9xx-series(E906/7/F/D/P) CPU porting code. */ #include "cpuport.h" #ifdef RT_USING_SMP #define rt_hw_interrupt_disable rt_hw_local_irq_disable #define rt_hw_interrupt_enable rt_hw_local_irq_enable #endif /* * Functions: vPortYield */ .global vPortYield .type vPortYield, %function vPortYield: li t0, 0xE080100C lb t1, (t0) li t2, 0x01 or t1, t1, t2 sb t1, (t0) ret /* * #ifdef RT_USING_SMP * void rt_hw_context_switch_to(rt_ubase_t to, stuct rt_thread *to_thread); * #else * void rt_hw_context_switch_to(rt_ubase_t to); * #endif * a0 --> to * a1 --> to_thread */ .globl rt_hw_context_switch_to rt_hw_context_switch_to: /* save a0 to to_thread */ la t0, rt_interrupt_to_thread STORE a0, (t0) /* save 0 to from_thread */ la t0, rt_interrupt_from_thread li t1, 0 STORE t1, (t0) /* set rt_thread_switch_interrupt_flag=1 */ la t0, rt_thread_switch_interrupt_flag li t1, 1 STORE t1, (t0) /* enable mexstatus SPUSHEN */ #ifdef CONFIG_THEAD_EXT_SPUSHEN li t0, 0x10000 csrs mexstatus, t0 #endif csrw mscratch, sp /* set software interrupt */ li t0, 0xE080100C lb t1, (t0) li t2, 0x01 or t1, t1, t2 sb t1, (t0) /* enable global interrup */ csrsi mstatus, 8 ret /* * #ifdef RT_USING_SMP * void rt_hw_context_switch(rt_ubase_t from, rt_ubase_t to, struct rt_thread *to_thread); * #else * void rt_hw_context_switch(rt_ubase_t from, rt_ubase_t to); * #endif * * a0 --> from * a1 --> to * a2 --> to_thread */ .globl rt_hw_context_switch rt_hw_context_switch: .globl rt_hw_context_switch_interrupt rt_hw_context_switch_interrupt: /* check rt_thread_switch_interrupt_flag */ la t0, rt_thread_switch_interrupt_flag lw t1, (t0) li t2, 1 beq t1, t2, .reswitch /* set rt_thread_switch_interrupt_flag=1 */ STORE t2, (t0) /* update from_thread */ la t0, rt_interrupt_from_thread STORE a0, (t0) .reswitch: /* update to_thread */ la t0, rt_interrupt_to_thread STORE a1, (t0) /* set software interrupt */ li t0, 0xE080100C lb t1, (t0) li t2, 0x01 or t1, t1, t2 sb t1, (t0) ret /* * PendSV_Handler */ .global PendSV_Handler .type PendSV_Handler, %function PendSV_Handler: /* check rt_thread_switch_interrupt_flag */ sw t0, (-4)(sp) sw t1, (-8)(sp) la t0, rt_thread_switch_interrupt_flag lw t1, (t0) beqz t1, .pendsv_exit /* clear rt_thread_switch_interrupt_flag */ li t1, 0x0 sw t1, (t0) /* check rt_interrupt_from_thread */ la t0, rt_interrupt_from_thread lw t1, (t0) beqz t1, .switch_to_thead /* restore from thread context t0,t1 */ lw t0, (-4)(sp) lw t1, (-8)(sp) #ifdef ARCH_RISCV_FPU addi sp, sp, -32 * FREGBYTES FSTORE f0, 0 * FREGBYTES(sp) FSTORE f1, 1 * FREGBYTES(sp) FSTORE f2, 2 * FREGBYTES(sp) FSTORE f3, 3 * FREGBYTES(sp) FSTORE f4, 4 * FREGBYTES(sp) FSTORE f5, 5 * FREGBYTES(sp) FSTORE f6, 6 * FREGBYTES(sp) FSTORE f7, 7 * FREGBYTES(sp) FSTORE f8, 8 * FREGBYTES(sp) FSTORE f9, 9 * FREGBYTES(sp) FSTORE f10, 10 * FREGBYTES(sp) FSTORE f11, 11 * FREGBYTES(sp) FSTORE f12, 12 * FREGBYTES(sp) FSTORE f13, 13 * FREGBYTES(sp) FSTORE f14, 14 * FREGBYTES(sp) FSTORE f15, 15 * FREGBYTES(sp) FSTORE f16, 16 * FREGBYTES(sp) FSTORE f17, 17 * FREGBYTES(sp) FSTORE f18, 18 * FREGBYTES(sp) FSTORE f19, 19 * FREGBYTES(sp) FSTORE f20, 20 * FREGBYTES(sp) FSTORE f21, 21 * FREGBYTES(sp) FSTORE f22, 22 * FREGBYTES(sp) FSTORE f23, 23 * FREGBYTES(sp) FSTORE f24, 24 * FREGBYTES(sp) FSTORE f25, 25 * FREGBYTES(sp) FSTORE f26, 26 * FREGBYTES(sp) FSTORE f27, 27 * FREGBYTES(sp) FSTORE f28, 28 * FREGBYTES(sp) FSTORE f29, 29 * FREGBYTES(sp) FSTORE f30, 30 * FREGBYTES(sp) FSTORE f31, 31 * FREGBYTES(sp) #endif #ifdef ARCH_RISCV_DSP addi sp, sp, -33 * REGBYTES #else addi sp, sp, -32 * REGBYTES #endif STORE x1, 1 * REGBYTES(sp) csrr x1, mepc STORE x1, 0 * REGBYTES(sp) csrr x1, mstatus STORE x1, 2 * REGBYTES(sp) /* x3 don't need save */ STORE x4, 4 * REGBYTES(sp) STORE x5, 5 * REGBYTES(sp) STORE x6, 6 * REGBYTES(sp) STORE x7, 7 * REGBYTES(sp) STORE x8, 8 * REGBYTES(sp) STORE x9, 9 * REGBYTES(sp) STORE x10, 10 * REGBYTES(sp) STORE x11, 11 * REGBYTES(sp) STORE x12, 12 * REGBYTES(sp) STORE x13, 13 * REGBYTES(sp) STORE x14, 14 * REGBYTES(sp) STORE x15, 15 * REGBYTES(sp) STORE x16, 16 * REGBYTES(sp) STORE x17, 17 * REGBYTES(sp) STORE x18, 18 * REGBYTES(sp) STORE x19, 19 * REGBYTES(sp) STORE x20, 20 * REGBYTES(sp) STORE x21, 21 * REGBYTES(sp) STORE x22, 22 * REGBYTES(sp) STORE x23, 23 * REGBYTES(sp) STORE x24, 24 * REGBYTES(sp) STORE x25, 25 * REGBYTES(sp) STORE x26, 26 * REGBYTES(sp) STORE x27, 27 * REGBYTES(sp) STORE x28, 28 * REGBYTES(sp) STORE x29, 29 * REGBYTES(sp) STORE x30, 30 * REGBYTES(sp) STORE x31, 31 * REGBYTES(sp) #ifdef ARCH_RISCV_DSP csrr t0, vxsat STORE t0, 32 * REGBYTES(sp) #endif /* store from_thread sp */ la t0, rt_interrupt_from_thread lw t0, (t0) sw sp, (t0) .switch_to_thead: /* restore to thread context * sp(0) -> epc; * sp(1) -> ra; * sp(i) -> x(i+2) */ la t0, rt_interrupt_to_thread lw t0, (t0) LOAD sp, (t0) #ifdef ARCH_RISCV_DSP LOAD a1, 32 * REGBYTES(sp) csrw vxsat, a1 #endif /* restore ra to mepc */ LOAD a1, 0 * REGBYTES(sp) csrw mepc, a1 LOAD x1, 1 * REGBYTES(sp) /* force to machine mode(MPP=11) */ LOAD a1, 2 * REGBYTES(sp) csrw mstatus, a1 /* x3 don't need restore */ LOAD x4, 4 * REGBYTES(sp) LOAD x5, 5 * REGBYTES(sp) LOAD x6, 6 * REGBYTES(sp) LOAD x7, 7 * REGBYTES(sp) LOAD x8, 8 * REGBYTES(sp) LOAD x9, 9 * REGBYTES(sp) LOAD x10, 10 * REGBYTES(sp) LOAD x11, 11 * REGBYTES(sp) LOAD x12, 12 * REGBYTES(sp) LOAD x13, 13 * REGBYTES(sp) LOAD x14, 14 * REGBYTES(sp) LOAD x15, 15 * REGBYTES(sp) LOAD x16, 16 * REGBYTES(sp) LOAD x17, 17 * REGBYTES(sp) LOAD x18, 18 * REGBYTES(sp) LOAD x19, 19 * REGBYTES(sp) LOAD x20, 20 * REGBYTES(sp) LOAD x21, 21 * REGBYTES(sp) LOAD x22, 22 * REGBYTES(sp) LOAD x23, 23 * REGBYTES(sp) LOAD x24, 24 * REGBYTES(sp) LOAD x25, 25 * REGBYTES(sp) LOAD x26, 26 * REGBYTES(sp) LOAD x27, 27 * REGBYTES(sp) LOAD x28, 28 * REGBYTES(sp) LOAD x29, 29 * REGBYTES(sp) LOAD x30, 30 * REGBYTES(sp) LOAD x31, 31 * REGBYTES(sp) #ifdef ARCH_RISCV_DSP addi sp, sp, 33 * REGBYTES #else addi sp, sp, 32 * REGBYTES #endif #ifdef ARCH_RISCV_FPU FLOAD f0, 0 * FREGBYTES(sp) FLOAD f1, 1 * FREGBYTES(sp) FLOAD f2, 2 * FREGBYTES(sp) FLOAD f3, 3 * FREGBYTES(sp) FLOAD f4, 4 * FREGBYTES(sp) FLOAD f5, 5 * FREGBYTES(sp) FLOAD f6, 6 * FREGBYTES(sp) FLOAD f7, 7 * FREGBYTES(sp) FLOAD f8, 8 * FREGBYTES(sp) FLOAD f9, 9 * FREGBYTES(sp) FLOAD f10, 10 * FREGBYTES(sp) FLOAD f11, 11 * FREGBYTES(sp) FLOAD f12, 12 * FREGBYTES(sp) FLOAD f13, 13 * FREGBYTES(sp) FLOAD f14, 14 * FREGBYTES(sp) FLOAD f15, 15 * FREGBYTES(sp) FLOAD f16, 16 * FREGBYTES(sp) FLOAD f17, 17 * FREGBYTES(sp) FLOAD f18, 18 * FREGBYTES(sp) FLOAD f19, 19 * FREGBYTES(sp) FLOAD f20, 20 * FREGBYTES(sp) FLOAD f21, 21 * FREGBYTES(sp) FLOAD f22, 22 * FREGBYTES(sp) FLOAD f23, 23 * FREGBYTES(sp) FLOAD f24, 24 * FREGBYTES(sp) FLOAD f25, 25 * FREGBYTES(sp) FLOAD f26, 26 * FREGBYTES(sp) FLOAD f27, 27 * FREGBYTES(sp) FLOAD f28, 28 * FREGBYTES(sp) FLOAD f29, 29 * FREGBYTES(sp) FLOAD f30, 30 * FREGBYTES(sp) FLOAD f31, 31 * FREGBYTES(sp) addi sp, sp, 32 * FREGBYTES #endif .pendsv_exit: mret