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| author | Bruce Lai <bruce.lai@sifive.com> | 2023-03-22 00:53:16 -0700 |
|---|---|---|
| committer | libyuv LUCI CQ <libyuv-scoped@luci-project-accounts.iam.gserviceaccount.com> | 2023-04-10 00:50:25 +0000 |
| commit | 646fc1b21444db4cc9d4f2c9478b0748941574f5 (patch) | |
| tree | 82af1f505062e687f2af089e0f67a47d82bdd672 /docs | |
| parent | 0200037a5a058650cb2e2e2cca1545a362e52013 (diff) | |
| download | libyuv-646fc1b21444db4cc9d4f2c9478b0748941574f5.tar.gz | |
Enable RISC-V cmake build & qemu test
1. Provide script to build qemu & clang locally
2. Enable risc-v cmake build with clang
3. Enable test with qemu
4. Update doc to introduce how to cross-build & test with qemu
Signed-off-by: Bruce Lai <bruce.lai@sifive.com>
Change-Id: I7ce8315993b0e8300e8fd5b1632610a91a4e9f52
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/4401740
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/getting_started.md | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/docs/getting_started.md b/docs/getting_started.md index 15b19ab2..ff1c185a 100644 --- a/docs/getting_started.md +++ b/docs/getting_started.md @@ -220,6 +220,39 @@ Install cmake: http://www.cmake.org/ make -j4 make package +## Building RISC-V target with cmake + +### Prerequisite: build risc-v clang toolchain and qemu + +If you don't have prebuilt clang and riscv64 qemu, run the script to download source and build them. + + ./riscv_script/prepare_toolchain_qemu.sh + +After running script, clang & qemu are built in `build-toolchain-qemu/riscv-clang/` & `build-toolchain-qemu/riscv-qemu/`. + +### Cross-compile for RISC-V target + cmake -B out/Release/ -DTEST=ON \ + -DCMAKE_BUILD_TYPE=Release \ + -DCMAKE_TOOLCHAIN_FILE="./riscv_script/riscv-clang.cmake" \ + -DTOOLCHAIN_PATH={TOOLCHAIN_PATH} \ + -DUSE_RVV=ON . + cmake --build out/Release/ + + +### Run on QEMU + +To test RVV on user mode QEMU, we need to hack `source/cpu_id.cc`. By forcing `RiscvCpuCaps` to read from a dummy cpuinfo file instead of the host `/proc/cpuinfo`. Because the program detects CPU Caps from `/proc/cpuinfo` and determines whether to use RVV originally. + + sed -i 's+RiscvCpuCaps("/proc/cpuinfo+RiscvCpuCaps("../../unit_test/testdata/riscv64_rvv.txt+g' source/cpu_id.cc + +#### Run libyuv_unittest on QEMU + cd out/Release/ + USE_RVV=ON \ + TOOLCHAIN_PATH={TOOLCHAIN_PATH} \ + QEMU_PREFIX_PATH={QEMU_PREFIX_PATH} \ + ../../riscv_script/run_qemu.sh libyuv_unittest + + ## Setup for Arm Cross compile See also https://www.ccoderun.ca/programming/2015-12-20_CrossCompiling/index.html |