opencv/3rdparty/zlib-ng/arch/riscv/riscv_features.c
FantasqueX 85923c8f30
Merge pull request from FantasqueX:zlib-ng-2-2-1
Update zlib-ng to 2.2.1 

Release: https://github.com/zlib-ng/zlib-ng/releases/tag/2.2.1
ARM diagnostics patch: https://github.com/zlib-ng/zlib-ng/pull/1774

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake
2024-09-12 16:05:24 +03:00

53 lines
1.3 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/utsname.h>
#if defined(__linux__) && defined(HAVE_SYS_AUXV_H)
# include <sys/auxv.h>
#endif
#include "zbuild.h"
#include "riscv_features.h"
#define ISA_V_HWCAP (1 << ('v' - 'a'))
int Z_INTERNAL is_kernel_version_greater_or_equal_to_6_5() {
struct utsname buffer;
uname(&buffer);
int major, minor;
if (sscanf(buffer.release, "%d.%d", &major, &minor) != 2) {
// Something bad with uname()
return 0;
}
if (major > 6 || major == 6 && minor >= 5)
return 1;
return 0;
}
void Z_INTERNAL riscv_check_features_compile_time(struct riscv_cpu_features *features) {
#if defined(__riscv_v) && defined(__linux__)
features->has_rvv = 1;
#else
features->has_rvv = 0;
#endif
}
void Z_INTERNAL riscv_check_features_runtime(struct riscv_cpu_features *features) {
#if defined(__linux__) && defined(HAVE_SYS_AUXV_H)
unsigned long hw_cap = getauxval(AT_HWCAP);
#else
unsigned long hw_cap = 0;
#endif
features->has_rvv = hw_cap & ISA_V_HWCAP;
}
void Z_INTERNAL riscv_check_features(struct riscv_cpu_features *features) {
if (is_kernel_version_greater_or_equal_to_6_5())
riscv_check_features_runtime(features);
else
riscv_check_features_compile_time(features);
}