Probe {riscv,loongarch,arm}64 virtual memory address - #133380
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Tagging subscribers to this area: @anicka-net, @dotnet/gc |
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cc @t-mustafin, @dotnet/samsung |
janvorli
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Sep 7, 2026
t-mustafin
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Sep 8, 2026
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It seems we need similar treatment for arm64 too (e.g. for Android). See #85556 (comment) that mentions that Android ships with 39-bit VA size. |
tomeksowi
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Sep 8, 2026
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cc @LuckyXu-HF, @shushanhf, included LA64. |
shushanhf
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Sep 9, 2026
| static const int candidates[] = { 56, 47 }; | ||
| const int minVaBits = 38; | ||
| #else // TARGET_LOONGARCH64 | ||
| static const int candidates[] = { 47, 39 }; |
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In LA64, the range of memory address space accessible by application is: 0-2VALEN-1-1. Generally VALEN is in the range of [40,48]. Application can determine the specific value of VALEN by executing the CPUCFG instruction to read the VALEN field of the 0x1 configuration word.
clamp03
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Sep 10, 2026
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Modern riscv64 systems are using sv48 and GC remains limited to sv39. PR probes it at run-time.