# Final project
## Install riscv-gnu-toolchain
### Getting the sources
```bash=
git clone https://github.com/riscv/riscv-gnu-toolchain
cd riscv-gnu-toolchain
git submodule update --init --recursive
```
### Prerequisites
On Ubuntu, executing the following command should suffice:
```bash=
sudo apt-get install autoconf automake autotools-dev curl python3 libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev ninja-build
```
### Installation (Linux)
To build the Linux cross-compiler, pick an install path. If you choose, say, /opt/riscv, then add /opt/riscv/bin to your PATH now.
```bash=
vim ~/.bashrc
export RISCV="/opt/riscv"
export PATH=$PATH:$RISCV/bin
:wq #save and quit
source ~/.bashrc
```
Create a directory in opt
```bash=
cd /opt
sudo mkdir riscv
sudo chown $USER riscv
```
Then, simply run the following command:
```bash=
cd riscv-gnu-toolchain
./configure --prefix=$RISCV
make linux
```
## MEMZERO and MEMCOPY instructions
[MEMZERO and MEMCOPY instructions](https://github.com/AndyGlew/Ri5-stuff/wiki/MEMZERO-and-MEMCOPY-instructions-proposal)
## Install riscv-opcodes
```bash=
git clone https://github.com/riscv/riscv-opcodes
```
## Install crosstool-NG
```bash=
$ git clone https://github.com/crosstool-ng/crosstool-ng
$ cd crosstool-ng
$ ./bootstrap
$ ./configure --prefix=/opt/crosstool-ng
$ make
$ make install
$ export PATH="${PATH}:/opt/crosstool-ng/bin"
$ source ~/.bashrc
```
In `./configure` step, it may have some configure error and just install the relative tool.
For example,
```bash=
configure: error: missing required tool: help2man
$ sudo apt-get install help2man
```
Note that if after the `libtool` installation is complete, re-execute the ./configure configuration command again, and find that the configuration is still wrong, and the same error is reported, try install `libtool-bin`:
```bash=
configure: error: missing required tool: libtool
$ sudo apt-get install libtool
$ ./configure --prefix=/opt/crosstool-ng
configure: error: missing required tool: libtool
$ sudo apt-get install libtool-bin
```
```bash=
configure: error: curses library not found
$ sudo apt-get install libncurses5-dev
```
## Install riscv-tools
```bash=
git clone https://github.com/riscv/riscv-tools.git
cd riscv-tools
git submodule update --init --recursive
./build.sh
```
- Modify the file `Makefile` in `riscv-tools/riscv-opcodes/`:
- Modify the file `parse-opcodes` in `riscv-tools/riscv-opcodes/`:
`#!/usr/bin/python` change to `#!/usr/bin/python2`
Now we will add a "MEMZERO" and "MEMCOPY" instruction to the ISA. The instruction and its semantics are given below:
Open the file `riscv-opcodes/opcodes`, here you will be able to see the various opcodes and instruction bits assigned to various instructions. Assigned an unused instruction to modulo inst.
## Study PicoRV32
### PicoRV32
[PicoRV32](https://github.com/YosysHQ/picorv32) is a CPU core that implements the [RISC-V RV32IMC Instruction Set](https://riscv.org/). It can be configured as RV32E, RV32I, RV32IC, RV32IM, or RV32IMC core, and optionally contains a built-in interrupt controller.
## References
1. [How to change permission of /root/opt while it is owned by root](https://askubuntu.com/questions/326460/how-to-change-permission-of-root-opt-while-it-is-owned-by-root)
2. [riscv-gnu-toolchain](https://github.com/riscv-collab/riscv-gnu-toolchain)
3.
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