riscv64: replace deprecated legacy extensions to SBI 2.0 extensions #1088
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mkroening
requested changes
Mar 13, 2024
mkroening
requested changes
Apr 16, 2024
The SBI legacy extensions are deprecated 4 years ago ( riscv-non-isa/riscv-sbi-doc@705e955 ). We replace it using functions from SBI 2.0 extensions. Specifically: - the legacy console_putchar is replaced into console_write_byte in SBI DBCN extension; - legacy shutdown is replaced to system_reset in SBI SRST extension with ColdReboot and NoReason as parameters; - legacy set_timer is replaced with SBI TIME set_timer; - legacy send_ipi is replaced to SBI IPI extension. The code implemented in file processor.rs creates a HartMask with only one hart_id selected as an IPI target. Signed-off-by: Zhouqi Jiang <luojia@hust.edu.cn>
mkroening
approved these changes
Apr 17, 2024
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The SBI legacy extensions are deprecated 4 years ago ( riscv-non-isa/riscv-sbi-doc@705e955 ). We replace it using functions from SBI 2.0 extensions. Specifically:
By updating to SBI 2.0, this commit supports to send IPI to hart IDs greater than 63 (on 64-bit devices). The current code encodes hart_id parameter in bit-vector like
1 << hart_id, which will cause the bit to be shifted out fromusizerange whenhart_id >= 64. SBI 2.0 fixed this problem by adding ahart_mask_baseparameter, allowing us to specify any hart ID withinusizerange when is provided as an SBI IPI hart mask.