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zhangwenxiang
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riscv operating system
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‎.gitignore

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out
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*.o
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*.out
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*.elf

‎.vscode/launch.json

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{
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// Use IntelliSense to learn about possible attributes.
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// Hover to view descriptions of existing attributes.
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// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
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"version": "0.2.0",
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"configurations": [
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{
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"name": "riscv-debug",
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"type": "cppdbg",
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"request": "launch",
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"cwd": "${workspaceFolder}/${relativeFileDirname}",
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"program": "out/os.elf",
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"stopAtEntry": false,
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"MIMode": "gdb",
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"miDebuggerPath": "/usr/bin/gdb-multiarch",
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"miDebuggerServerAddress": "localhost:1234",
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"preLaunchTask": "qemu-run",
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},
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]
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}

‎.vscode/settings.json

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{
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"files.associations": {
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"os.h": "c"
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}
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}

‎.vscode/tasks.json

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{
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"version": "2.0.0",
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"tasks": [
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{
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"label": "makefile-make",
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"type": "shell",
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"options": {
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"cwd": "${workspaceFolder}/${relativeFileDirname}"
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},
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"command": "make",
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// "group": {
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// "kind": "build",
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// "isDefault": true
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// },
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"problemMatcher": ["$gcc"]
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},
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{
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"label": "qemu-run",
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"type": "shell",
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"options": {
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"cwd": "${workspaceFolder}/${relativeFileDirname}"
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},
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"command": "echo 'QEMU started'; qemu-system-riscv32 -nographic -smp 1 -machine virt -bios none -serial mon:stdio -gdb tcp::1234 -S -kernel out/os.elf",
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"args": [],
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"dependsOn": ["makefile-make"],
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"isBackground": true,
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"problemMatcher": [
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{
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"pattern": [
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{
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"regexp": ".",
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"file": 1,
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"location": 2,
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"message": 3
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}
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],
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"background": {
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"activeOnStart": true,
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"beginsPattern": ".",
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"endsPattern": "QEMU started",
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}
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}
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]
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},
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{
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// lsof -i tcp:1234 -> kill [pid]
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"type": "shell",
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"label": "Kill Qemu Server",
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"command": "ps -ef | grep qemu-riscv64 | grep -v grep | awk '{print $2}' | xargs -i kill -9 {}"
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},
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]
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}

‎00-bootstrap/Makefile

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USE_LINKER_SCRIPT = false
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SRCS_ASM = \
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start.S \
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SRCS_C = \
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kernel.c \
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include ../common.mk

‎00-bootstrap/kernel.c

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// called in start.S
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// j start_kernel
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void start_kernel(void)
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{
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while (1) {}; // stop here!
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}
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‎00-bootstrap/platform.h

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#ifndef __PLATFORM_H__
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#define __PLATFORM_H__
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/*
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* QEMU RISC-V Virt machine with 16550a UART and VirtIO MMIO
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*/
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/*
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* maximum number of CPUs
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* see https://github.com/qemu/qemu/blob/master/include/hw/riscv/virt.h
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* #define VIRT_CPUS_MAX 8
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*/
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#define MAXNUM_CPU 8
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#endif /* __PLATFORM_H__ */

‎00-bootstrap/start.S

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#include "platform.h"
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# size of each hart's stack is 1024 bytes
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.equ STACK_SIZE, 1024
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.global _start
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.text
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_start: # <- asm program start from the 1st instructions
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# park harts with id != 0
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# csrr (csr read), csrr rd, csr
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# csrw (csr write), csrw csr, rs
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# m-hard-id
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csrr t0, mhartid # read current m-hart-id to t0
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mv tp, t0 # keep CPU's hartid in its tp for later usage.
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bnez t0, park # branch to park if t0 not equal to zero
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# Setup stacks, the stack grows from bottom to top, so we put the
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# stack pointer to the very end of the stack range.
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# slli (shift left logical immediate): slli rd, rs, imm: rd = rs1 << imm
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slli t0, t0, 10 # shift left the hart id by 1024
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# la (load address): la rd, label
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la sp, stacks + STACK_SIZE # set the initial stack pointer
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# to the end of the first stack space
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# add rd, rs1, rs2: rd = rs1 + rs2
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add sp, sp, t0 # move the current hart stack pointer
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# to its place in the stack space
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# jump
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j start_kernel # hart 0 jump to kernal.c
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park:
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wfi # wait for interrupt
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j park # jump to park (dead loops)
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# In the standard RISC-V calling convention, the stack pointer sp
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# is always 16-byte aligned.
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.balign 16
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stacks:
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.skip STACK_SIZE * MAXNUM_CPU # allocate space for all the harts stacks
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.end # End of file

‎01-helloRVOS/Makefile

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USE_LINKER_SCRIPT = false
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SRCS_ASM = \
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start.S \
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SRCS_C = \
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kernel.c \
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uart.c \
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include ../common.mk

‎01-helloRVOS/core

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‎01-helloRVOS/kernel.c

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extern void uart_init(void);
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extern void uart_puts(char *s);
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void start_kernel(void)
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{
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uart_init();
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uart_puts("Hello, RVOS!\n");
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while (1) {}; // stop here!
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}
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‎01-helloRVOS/platform.h

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#ifndef __PLATFORM_H__
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#define __PLATFORM_H__
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/*
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* QEMU RISC-V Virt machine with 16550a UART and VirtIO MMIO
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*/
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/*
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* maximum number of CPUs
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* see https://github.com/qemu/qemu/blob/master/include/hw/riscv/virt.h
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* #define VIRT_CPUS_MAX 8
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*/
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#define MAXNUM_CPU 8
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/*
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* MemoryMap
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* see https://github.com/qemu/qemu/blob/master/hw/riscv/virt.c, virt_memmap[]
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* 0x00001000 -- boot ROM, provided by qemu
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* 0x02000000 -- CLINT
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* 0x0C000000 -- PLIC
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* 0x10000000 -- UART0
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* 0x10001000 -- virtio disk
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* 0x80000000 -- boot ROM jumps here in machine mode, where we load our kernel
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*/
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/* This machine puts UART registers here in physical memory. */
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#define UART0 0x10000000L
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#endif /* __PLATFORM_H__ */

‎01-helloRVOS/start.S

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#include "platform.h"
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# size of each hart's stack is 1024 bytes
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.equ STACK_SIZE, 1024
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.global _start
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.text
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_start:
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# park harts with id != 0
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csrr t0, mhartid # read current hart id
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mv tp, t0 # keep CPU's hartid in its tp for later usage.
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bnez t0, park # if we're not on the hart 0
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# we park the hart
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# Setup stacks, the stack grows from bottom to top, so we put the
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# stack pointer to the very end of the stack range.
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slli t0, t0, 10 # shift left the hart id by 1024
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la sp, stacks + STACK_SIZE # set the initial stack pointer
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# to the end of the first stack space
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add sp, sp, t0 # move the current hart stack pointer
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# to its place in the stack space
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j start_kernel # hart 0 jump to c
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park:
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wfi
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j park
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# In the standard RISC-V calling convention, the stack pointer sp
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# is always 16-byte aligned.
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.balign 16
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stacks:
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.skip STACK_SIZE * MAXNUM_CPU # allocate space for all the harts stacks
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.end # End of file

‎01-helloRVOS/types.h

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#ifndef __TYPES_H__
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#define __TYPES_H__
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typedef unsigned char uint8_t;
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typedef unsigned short uint16_t;
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typedef unsigned int uint32_t;
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typedef unsigned long long uint64_t;
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#endif /* __TYPES_H__ */

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