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Add basic ACPI infrastructure for RISC-V with below tables. 1) DSDT with below basic objects - CPUs - fw_cfg 2) FADT revision 6 with HW_REDUCED flag 3) XSDT 4) RSDP Add this functionality in a new file virt-acpi-build.c and enable building this infrastructure. Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Message-ID: <20230302091212.999767-5-sunilvl@ventanamicro.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>