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add support for linux_riscv64 and freestanding_riscv64
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.text | ||
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.globl _start | ||
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_start: | ||
ld a0, 0(sp) | ||
addi a1, sp, 8 | ||
addi sp, sp, ~15 | ||
call _start_odin | ||
ebreak |
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//+build riscv64 | ||
//+build linux | ||
package sysinfo | ||
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import "base:intrinsics" | ||
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import "core:sys/linux" | ||
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@(init, private) | ||
init_cpu_features :: proc() { | ||
fd, err := linux.open("/proc/self/auxv", {}) | ||
if err != .NONE { return } | ||
defer linux.close(fd) | ||
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// This is probably enough right? | ||
buf: [4096]byte | ||
n, rerr := linux.read(fd, buf[:]) | ||
if rerr != .NONE || n == 0 { return } | ||
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ulong :: u64 | ||
AT_HWCAP :: 16 | ||
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// TODO: using these we could get more information than just the basics. | ||
// AT_HWCAP2 :: 26 | ||
// AT_HWCAP3 :: 29 | ||
// AT_HWCAP4 :: 30 | ||
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auxv := buf[:n] | ||
for len(auxv) >= size_of(ulong)*2 { | ||
key := intrinsics.unaligned_load((^ulong)(&auxv[0])) | ||
val := intrinsics.unaligned_load((^ulong)(&auxv[size_of(ulong)])) | ||
auxv = auxv[2*size_of(ulong):] | ||
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if key != AT_HWCAP { | ||
continue | ||
} | ||
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cpu_features = transmute(CPU_Features)(val) | ||
break | ||
} | ||
} | ||
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@(init, private) | ||
init_cpu_name :: proc() { | ||
cpu_name = "RISCV64" | ||
} |
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package sysinfo | ||
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CPU_Feature :: enum u64 { | ||
I = 'I' - 'A', // Base features, don't think this is ever not here. | ||
M = 'M' - 'A', // Integer multiplication and division, currently required by Odin. | ||
A = 'A' - 'A', // Atomics. | ||
F = 'F' - 'A', // Single precision floating point, currently required by Odin. | ||
D = 'D' - 'A', // Double precision floating point, currently required by Odin. | ||
C = 'C' - 'A', // Compressed instructions. | ||
V = 'V' - 'A', // Vector operations. | ||
} | ||
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CPU_Features :: distinct bit_set[CPU_Feature; u64] | ||
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cpu_features: Maybe(CPU_Features) | ||
cpu_name: Maybe(string) |
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