hw/riscv: Provide rdtime callback for TCG in CLINT emulation
This patch extends CLINT emulation to provide rdtime callback for TCG. This rdtime callback will be called wheneven TIME CSRs are read in privileged modes. Signed-off-by: NAnup Patel <anup.patel@wdc.com> Reviewed-by: NAlistair Francis <alistair.francis@wdc.com> Signed-off-by: NPalmer Dabbelt <palmerdabbelt@google.com>
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