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/freebsd-11.0-release/sys/arm64/arm64/ | ||
H A D | identcpu.c | diff 285311 Thu Jul 09 11:40:39 MDT 2015 zbb Rework CPU identification on ARM64 This commit reworks the code responsible for identification of the CPUs during runtime. It is necessary to provide a way for workarounds and erratums to be applied only for certain HW versions. The copy of MIDR is now stored in pcpu to provide a fast and convenient way for assambly code to read it (pcpu is used quite often so there is a chance it's inside the cache). The MIDR is also better way of identification than using user-friendly cpu_desc structure, because it can be compiled into comparision of single u32 with only one access to the memory - this is crucial for some erratums which are called from performance-critical places. Changes in cpu_identify makes this function safe to be called on non-boot CPUs. New function CPU_MATCH was implemented which returns boolean value based on mathing masked MIDR with chip identification. Example of usage: printf("is thunder: %d\n", CPU_MATCH(CPU_IMPL_MASK | CPU_PART_MASK, CPU_IMPL_CAVIUM, CPU_PART_THUNDER, 0, 0)); printf("is generic: %d\n", CPU_MATCH(CPU_IMPL_MASK | CPU_PART_MASK, CPU_IMPL_ARM, CPU_PART_FOUNDATION, 0, 0)); Reviewed by: andrew Obtained from: Semihalf Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D3030 |
/freebsd-11.0-release/sys/arm64/include/ | ||
H A D | pcpu.h | diff 285311 Thu Jul 09 11:40:39 MDT 2015 zbb Rework CPU identification on ARM64 This commit reworks the code responsible for identification of the CPUs during runtime. It is necessary to provide a way for workarounds and erratums to be applied only for certain HW versions. The copy of MIDR is now stored in pcpu to provide a fast and convenient way for assambly code to read it (pcpu is used quite often so there is a chance it's inside the cache). The MIDR is also better way of identification than using user-friendly cpu_desc structure, because it can be compiled into comparision of single u32 with only one access to the memory - this is crucial for some erratums which are called from performance-critical places. Changes in cpu_identify makes this function safe to be called on non-boot CPUs. New function CPU_MATCH was implemented which returns boolean value based on mathing masked MIDR with chip identification. Example of usage: printf("is thunder: %d\n", CPU_MATCH(CPU_IMPL_MASK | CPU_PART_MASK, CPU_IMPL_CAVIUM, CPU_PART_THUNDER, 0, 0)); printf("is generic: %d\n", CPU_MATCH(CPU_IMPL_MASK | CPU_PART_MASK, CPU_IMPL_ARM, CPU_PART_FOUNDATION, 0, 0)); Reviewed by: andrew Obtained from: Semihalf Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D3030 |
H A D | cpu.h | diff 285311 Thu Jul 09 11:40:39 MDT 2015 zbb Rework CPU identification on ARM64 This commit reworks the code responsible for identification of the CPUs during runtime. It is necessary to provide a way for workarounds and erratums to be applied only for certain HW versions. The copy of MIDR is now stored in pcpu to provide a fast and convenient way for assambly code to read it (pcpu is used quite often so there is a chance it's inside the cache). The MIDR is also better way of identification than using user-friendly cpu_desc structure, because it can be compiled into comparision of single u32 with only one access to the memory - this is crucial for some erratums which are called from performance-critical places. Changes in cpu_identify makes this function safe to be called on non-boot CPUs. New function CPU_MATCH was implemented which returns boolean value based on mathing masked MIDR with chip identification. Example of usage: printf("is thunder: %d\n", CPU_MATCH(CPU_IMPL_MASK | CPU_PART_MASK, CPU_IMPL_CAVIUM, CPU_PART_THUNDER, 0, 0)); printf("is generic: %d\n", CPU_MATCH(CPU_IMPL_MASK | CPU_PART_MASK, CPU_IMPL_ARM, CPU_PART_FOUNDATION, 0, 0)); Reviewed by: andrew Obtained from: Semihalf Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D3030 |
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