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[mldr] Use __builtin_ctzl Instead Of log2 To Calculate The Page Shift
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src/startup/mldr/CMakeLists.txt
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src/startup/mldr/CMakeLists.txt
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target_link_options(mldr32 PRIVATE -m32)
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target_compile_options(mldr32 PRIVATE -pthread)
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target_link_options(mldr32 PRIVATE -pthread)
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target_link_libraries(mldr32 PRIVATE -lrt -ldl mldr32_dserver_rpc -lm)
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target_link_libraries(mldr32 PRIVATE -lrt -ldl mldr32_dserver_rpc)
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install(TARGETS mldr32 DESTINATION libexec/darling/usr/libexec/darling)
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endif()
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src/startup/mldr/commpage.c
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src/startup/mldr/commpage.c
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// I'm not sure if Linux has seperate page sizes for kernel and user space.
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// Apple's code uses left shift logical (1 << user_page_shift) to get the page size value.
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// Since it's very unlikely that the page size won't be a power of 2, we can use __builtin_ctzl()
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// as a substitute for log2().
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user_page_shift = (uint8_t*)CGET(_64bit ? _COMM_PAGE_USER_PAGE_SHIFT_64 : _COMM_PAGE_USER_PAGE_SHIFT_32);
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kernel_page_shift = (uint8_t*)CGET(_COMM_PAGE_KERNEL_PAGE_SHIFT);
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*kernel_page_shift = *user_page_shift = log2(sysconf(_SC_PAGESIZE));
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*kernel_page_shift = *user_page_shift = (uint8_t)__builtin_ctzl(sysconf(_SC_PAGESIZE));
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my_caps = get_cpu_caps();
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if (*ncpus == 1)