[RISCV] feat: add kernel fpu to support rdna graphics card #400
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[APPROVALNOTIFIER] This PR is NOT APPROVED This pull-request has been approved by: The full list of commands accepted by this bot can be found here.
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opsiff
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Sep 4, 2024
This is needed to support recent hardware in the amdgpu DRM driver. The FPU code in that driver is not performance-critical, so only provide the minimal support. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Signed-off-by: Icenowy Zheng <uwu@icenowy.me> Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
Since it is not possible to incrementally add/remove extensions from the compiler's ISA string by appending arguments, any code that wants to modify the ISA string must recreate the whole thing. To support this, factor out the logic for generating the -march argument so it can be reused where needed. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Signed-off-by: Icenowy Zheng <uwu@icenowy.me> Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
RISC-V uses kernel_fpu_begin()/kernel_fpu_end() like several other architectures. Enabling hardware FP requires overriding the ISA string for the relevant compilation units. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Signed-off-by: Icenowy Zheng <uwu@icenowy.me> Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
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