Custom memset implementation for Qualcomm Oryon CPU
Submitted on behalf of a third-party: Linaro Limited
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Copyright (c) 2012, Linaro Limited
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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Origin Project URL: https://android.googlesource.com/platform/bionic/
Commit ID: 7e4fa560999d07064d219a16ebb50d3691dd1b63
Third Party code includes additions/modifications from Qualcomm Innovation Center, Inc.
Test: All
Change-Id: I479a572a325e27262d27aa37c516618e4322e9bb
diff --git a/libc/arch-arm64/dynamic_function_dispatch.cpp b/libc/arch-arm64/dynamic_function_dispatch.cpp
index ca7f39f..db002b8 100644
--- a/libc/arch-arm64/dynamic_function_dispatch.cpp
+++ b/libc/arch-arm64/dynamic_function_dispatch.cpp
@@ -137,7 +137,32 @@
typedef int memset_func(void*, int, size_t);
DEFINE_IFUNC_FOR(memset) {
+ unsigned long midr;
+ unsigned int impl_id, cpu_variant;
+
+ if (arg->_hwcap & HWCAP_CPUID) {
+ /* Read the MIDR register */
+ asm("mrs %0, MIDR_EL1 \n\t" : "=r"(midr));
+
+ /* Extract the CPU Implementer ID */
+ impl_id = (midr >> MIDR_IMPL_ID_SHIFT) & (MIDR_IMPL_ID_MASK);
+
+ /* Check for Qualcomm implementer ID */
+ if (impl_id == QCOM_IMPL_ID) {
+ cpu_variant = (midr >> CPU_VARIANT_SHIFT) & CPU_VARIANT_MASK;
+
+ /* Check for Qualcomm Oryon CPU variants: 0x1, 0x2, 0x3, 0x4, 0x5 */
+ if (cpu_variant <= QCOM_ORYON_CPU_VARIANTS) {
+ RETURN_FUNC(memset_func, __memset_aarch64_nt);
+ } else {
+ RETURN_FUNC(memset_func, __memset_aarch64);
+ }
+ } else {
+ RETURN_FUNC(memset_func, __memset_aarch64);
+ }
+ } else {
RETURN_FUNC(memset_func, __memset_aarch64);
+ }
}
typedef char* stpcpy_func(char*, const char*, size_t);