riscv: read the hart ID from mhartid on boot
When in M-Mode, we can use the mhartid CSR to get the ID of the running HART. Doing so, direct M-Mode boot without firmware is possible. Signed-off-by:Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by:
Anup Patel <anup@brainfault.org> Reviewed-by:
Atish Patra <atish.patra@wdc.com> Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
Paul Walmsley <paul.walmsley@sifive.com>
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