util/cpuinfo-riscv: Use linux __riscv_hwprobe syscall

With recent linux kernels, there is a syscall to probe for various
ISA extensions. These bits were phased in over several kernel
releases, so w

util/cpuinfo-riscv: Use linux __riscv_hwprobe syscall

With recent linux kernels, there is a syscall to probe for various
ISA extensions. These bits were phased in over several kernel
releases, so we still require checks for symbol availability.

Acked-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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util/cpuinfo-riscv: Support OpenBSD signal frame

Reported-by: Brad Smith <brad@comstyle.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Daniel Henrique Barboza <dbarboza@venta

util/cpuinfo-riscv: Support OpenBSD signal frame

Reported-by: Brad Smith <brad@comstyle.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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util/cpuinfo-riscv: Support host/cpuinfo.h for riscv

Move detection code out of tcg, similar to other hosts.

Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Alistair Francis <al

util/cpuinfo-riscv: Support host/cpuinfo.h for riscv

Move detection code out of tcg, similar to other hosts.

Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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