/* FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd. All rights reserved VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. This file is part of the FreeRTOS distribution and was contributed to the project by Technolution B.V. (www.technolution.nl, freertos-riscv@technolution.eu) under the terms of the FreeRTOS contributors license. FreeRTOS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License (version 2) as published by the Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception. *************************************************************************** >>! NOTE: The modification to the GPL is included to allow you to !<< >>! distribute a combined work that includes FreeRTOS without being !<< >>! obliged to provide the source code for proprietary components !<< >>! outside of the FreeRTOS kernel. !<< *************************************************************************** FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Full license text is available on the following link: http://www.freertos.org/a00114.html *************************************************************************** * * * FreeRTOS provides completely free yet professionally developed, * * robust, strictly quality controlled, supported, and cross * * platform software that is more than just the market leader, it * * is the industry''s de facto standard. * * * * Help yourself get started quickly while simultaneously helping * * to support the FreeRTOS project by purchasing a FreeRTOS * * tutorial book, reference manual, or both: * * http://www.FreeRTOS.org/Documentation * * * *************************************************************************** http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading the FAQ page "My application does not run, what could be wrong?". Have you defined configASSERT()? http://www.FreeRTOS.org/support - In return for receiving this top quality embedded software for free we request you assist our global community by participating in the support forum. http://www.FreeRTOS.org/training - Investing in training allows your team to be as productive as possible as early as possible. Now you can receive FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers Ltd, and the world's leading authority on the world's leading RTOS. http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, including FreeRTOS+Trace - an indispensable productivity tool, a DOS compatible FAT file system, and our tiny thread aware UDP/IP stack. http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate. Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS. http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS licenses offer ticketed support, indemnification and commercial middleware. http://www.SafeRTOS.com - High Integrity Systems also provide a safety engineered and independently SIL3 certified version for use in safety and mission critical applications that require provable dependability. 1 tab == 4 spaces! */ //#include "encoding.h" #if __riscv_xlen == 64 # define STORE sd # define LOAD ld # define REGBYTES 8 #else # define STORE sw # define LOAD lw # define REGBYTES 4 #endif .section .text,"ax",@progbits .globl boot boot: li t6, 0x1800 csrw mstatus, t6 j _mstart .align 6 .section .text,"ax",@progbits .globl _mstart /* Startup code */ _mstart: la t0, trap_entry csrw mtvec, t0 li x1, 0 li x2, 0 li x3, 0 li x4, 0 li x5, 0 li x6, 0 li x7, 0 li x8, 0 li x9, 0 li x10, 0 li x11, 0 li x12, 0 li x13, 0 li x14, 0 li x15, 0 li x16, 0 li x17, 0 li x18, 0 li x19, 0 li x20, 0 li x21, 0 li x22, 0 li x23, 0 li x24, 0 li x25, 0 li x26, 0 li x27, 0 li x28, 0 li x29, 0 li x30, 0 li x31, 0 /* initialize global pointer */ la gp, _gp init_bss: /* init bss section */ la a0, __bss_start la a1, __bss_end-4 /* section end is actually the start of the next section */ li a2, 0x0 jal fill_block init_sbss: /* init bss section */ la a0, __sbss_start la a1, __sbss_end-4 /* section end is actually the start of the next section */ li a2, 0x0 jal fill_block write_stack_pattern: /* init bss section */ la a0, _stack_end /* note the stack grows from top to bottom */ la a1, __stack-4 /* section end is actually the start of the next section */ li a2, 0xABABABAB jal fill_block init_stack: /* set stack pointer */ la sp, _stack call main // TODO j vSyscallInit /* When trap is an interrupt, this function is called */ interrupt: slli t0,t0,1 srli t0,t0,1 addi t0,t0,-3 beq t0,x0,softwareInterrupt LOAD t0, 0x0(sp) addi sp, sp, REGBYTES /* Interupt is timer interrupt */ j TIMER_CMP_INT mret softwareInterrupt: /* Interupt is software interrupt */ LOAD t0, 0x0(sp) addi sp, sp, REGBYTES mret /* For when a trap is fired */ trap_entry: /* Check for interrupt */ addi sp, sp, -REGBYTES STORE t0, 0x0(sp) csrr t0, mcause blt t0,x0,interrupt LOAD t0, 0x0(sp) addi sp, sp, REGBYTES /* System call and other traps */ addi sp, sp, -REGBYTES*31 STORE x1, 1*REGBYTES(sp) STORE x2, 2*REGBYTES(sp) STORE x3, 3*REGBYTES(sp) 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) csrr a0, mcause csrr a1, mepc mv a2, sp //TODO jal ulSyscallTrap fatalException: j fatalException csrw mepc, a0 LOAD x1, 1*REGBYTES(sp) LOAD x2, 2*REGBYTES(sp) LOAD x3, 3*REGBYTES(sp) 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) addi sp, sp, REGBYTES*31 mret /* Fills memory blocks */ fill_block: sw a2, 0(a0) bgeu a0, a1, fb_end addi a0, a0, 4 j fill_block fb_end: ret