- This is a learning purpose project for myself and it is porting from sysprog21/semu. rv32-emu is a 32bits version of semu and currently supports basic RV32GC and it can boot the xv6-rv32 kernel. It might be incomplete and have bugs, if somebody want to discussion about that, welcome to contact me :).
- These are my reference project and study resources.
- Support features
- [DONE] RV32G
- [WIP ] RV32C
- [WIP ] RV32F
- [DONE] Privilege levels
- [DONE] CSR
- [DONE] Sv32
- [DONE] UART
- [DONE] CLINT
- [DONE] PLIC
- [DONE] VIRTIO
- Support Kernel
- [WIP ] xv6-rv32 (some bug for current commit)
- [WIP ] Linux kernel v5.4
- Build the rv32-emu:
$ make- Build riscv32 toolchain:
- Without Float/Double.
$ git clone https://github.com/riscv-collab/riscv-gnu-toolchain.git
$ cd riscv-gnu-toolchain
$ ./configure --prefix=/opt/riscv --with-arch=rv32imac --with-abi=ilp32
$ sudo make -j4- Build the u-boot:
$ git clone https://github.com/u-boot/u-boot.git
$ export CROSS_COMPILE=/<pathto>/riscv32-unknown-linux-gnu-
$ make
- Build the Opensbi:
$ git clone https://github.com/starfive-tech/opensbi.git
$ cd opensbi
$ export CROSS_COMPILE=/<pathto>/riscv32-unknown-linux-gnu-
$ make PLATFORM="generic" FW_PAYLOAD_PATH=../u-boot/u-boot.bin- Build the Linux Kernel(v5.4)
$ git clone https://github.com/torvalds/linux
$ cd linux
$ git checkout v5.4
$ make ARCH=riscv CROSS_COMPILE=/<pathto>/riscv32-unknown-linux-gnu- rv32_defconfig
$ vim .config
...
CONFIG_FPU=n
...
$ make ARCH=riscv CROSS_COMPILE=/<pathto>/riscv32-unknown-linux-gnu- -j4
$ ls arch/riscv/boot/Image- Output (a little bit slow):
$ ./rv_emu --elf xv6-rv32/kernel --rootfs xv6-rv32/fs.img
xv6 kernel is booting
init: starting sh
$
- Output
$ ./rv_emu --bios fw_payload.bin
OpenSBI VF_SDK_510_V1.2.1
____ _____ ____ _____
/ __ \ / ____| _ \_ _|
| | | |_ __ ___ _ __ | (___ | |_) || |
| | | | '_ \ / _ \ '_ \ \___ \| _ < | |
| |__| | |_) | __/ | | |____) | |_) || |_
\____/| .__/ \___|_| |_|_____/|____/_____|
| |
|_|
Platform Name : rv32-emu
Platform Features : medeleg
Platform HART Count : 1
Platform IPI Device : aclint-mswi
Platform Timer Device : aclint-mtimer @ 10000000Hz
Platform Console Device : uart8250
Platform HSM Device : ---
Platform Reboot Device : ---
Platform Shutdown Device : ---
Firmware Base : 0x80000000
Firmware Size : 204 KB
Runtime SBI Version : 0.3
Domain0 Name : root
Domain0 Boot HART : 0
Domain0 HARTs : 0*
Domain0 Region00 : 0x02000000-0x0200ffff (I)
Domain0 Region01 : 0x80000000-0x8003ffff ()
Domain0 Region02 : 0x00000000-0xffffffff (R,W,X)
Domain0 Next Address : 0x80400000
Domain0 Next Arg1 : 0x82200000
Domain0 Next Mode : S-mode
Domain0 SysReset : yes
Boot HART ID : 0
Boot HART Domain : root
Boot HART ISA : rv32imacsu
Boot HART Features : scounteren,mcounteren,mcountinhibit,sscofpmf,time
Boot HART PMP Count : 64
Boot HART PMP Granularity : 4
Boot HART PMP Address Bits: 32
Boot HART MHPM Count : 29
Boot HART MIDELEG : 0x00002222
Boot HART MEDELEG : 0x0000b109
U-Boot 2022.10-rc3-00062-g4e10c1227a-dirty (Sep 05 2022 - 00:46:20 +0800)
CPU: rv32imacsu
Model: rv32-emu
DRAM: 128 MiB
Core: 13 devices, 9 uclasses, devicetree: board
Loading Environment from nowhere... OK
In: uart@10000000
Out: uart@10000000
Err: uart@10000000
Net: No ethernet found.
Hit any key to stop autoboot: 1
0
=> bdinfo
......- Reference Output
- FIXME: UART has bugs.
$ ./rv_emu --bios fw_jump.bin --kernel Image --rootfs busybox.bin --dtb dts/riscv_em.dtb
[ 3.433362] virtio_blk virtio0: [vda] 65536 512-byte logical blocks (33.6 MB/32.0 MiB)
[ 3.477636] libphy: Fixed MDIO Bus: probed
[ 3.503936] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[ 3.505020] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[ 3.509911] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 3.511084] ehci-pci: EHCI PCI platform driver
[ 3.513450] ehci-platform: EHCI generic platform driver
[ 3.516399] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 3.517527] ohci-pci: OHCI PCI platform driver
[ 3.519893] ohci-platform: OHCI generic platform driver
[ 3.528264] usbcore: registered new interface driver uas
[ 3.531347] usbcore: registered new interface driver usb-storage
[ 3.536688] mousedev: PS/2 mouse device common for all mice
[ 3.547580] usbcore: registered new interface driver usbhid
[ 3.548594] usbhid: USB HID core driver
[ 3.589643] NET: Registered protocol family 10
[ 3.614942] Segment Routing with IPv6
[ 3.618890] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[ 3.643992] NET: Registered protocol family 17
[ 3.654559] 9pnet: Installing 9P2000 support
[ 3.656964] Key type dns_resolver registered
[ 3.691009] EXT4-fs (vda): mounting ext2 file system using the ext4 subsystem
[ 3.741424] EXT4-fs (vda): warning: mounting unchecked fs, running e2fsck is recommended
[ 3.755032] EXT4-fs (vda): mounted filesystem without journal. Opts: (null)
[ 3.757121] VFS: Mounted root (ext2 filesystem) on device 254:0.
[ 3.761763] devtmpfs: mounted
[ 3.769553] Freeing unused kernel memory: 192K
[ 3.770454] This architecture does not have kernel memory protection.
[ 3.771604] Run /sbin/init as init process
can't run '/etc
-
Passed Tests
I: Base Integer Instruction SetM: Standard Extension for Integer Multiplication and Division
-
Failed Tests
C: Standard Extension for Compressed Instruction- c.ebreak
-
Build and test:
$ make clean
$ make CONFIG_ARCH_TEST=1 arch-test RISCV_DEVICE=I
$ make CONFIG_ARCH_TEST=1 arch-test RISCV_DEVICE=M
$ make CONFIG_ARCH_TEST=1 arch-test RISCV_DEVICE=C