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| author | Dino Li <Dino.Li@ite.com.tw> | 2019-06-10 16:26:36 +0800 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2019-06-11 17:26:38 +0000 |
| commit | 59d060ebfe68082f4ea87214ffcda976c55176af (patch) | |
| tree | e237e25e9979220a716b72b65d43fb559504bc60 /core/riscv-rv32i/__builtin.c | |
| parent | 3a668749460466ff002b5dd2cbf00529f97e5974 (diff) | |
| download | chrome-ec-59d060ebfe68082f4ea87214ffcda976c55176af.tar.gz | |
core:RISC-V / chip:IT83202
The IT83202 is an embedded controller with RISC-V core.
It supports maximum ram size to 256KB and internal flash to 1MB.
BUG=none
BRANCH=none
TEST=EC boots and test console commands (eg: taskinfo, version, sysjump...)
on it83202 EVB.
Change-Id: I424c0d2878beb941c816363b5c7a3f57fda9fd13
Signed-off-by: Dino Li <Dino.Li@ite.com.tw>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1588300
Reviewed-by: Jett Rink <jettrink@chromium.org>
Commit-Queue: Jett Rink <jettrink@chromium.org>
Diffstat (limited to 'core/riscv-rv32i/__builtin.c')
| -rw-r--r-- | core/riscv-rv32i/__builtin.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/core/riscv-rv32i/__builtin.c b/core/riscv-rv32i/__builtin.c new file mode 100644 index 0000000000..4bf495a011 --- /dev/null +++ b/core/riscv-rv32i/__builtin.c @@ -0,0 +1,16 @@ +/* Copyright 2019 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "common.h" + +/* + * __builtin_ffs: + * Returns one plus the index of the least significant 1-bit of x, + * or if x is zero, returns zero. + */ +int __keep __ffssi2(int x) +{ + return 32 - __builtin_clz(x & -x); +} |