diff --git a/riscv-platform-spec.adoc b/riscv-platform-spec.adoc index 9b29180..e4a8bdc 100644 --- a/riscv-platform-spec.adoc +++ b/riscv-platform-spec.adoc @@ -449,35 +449,32 @@ mentioned in the requirements.
==== Runtime Services -===== SBI - -- Required SBI spec version is 0.3 or higher. -- Required SBI extensions -
-[cols="1,2", width=80%, align="left", options="header"] -|=== -|EXTENSION | CONDITIONS -|SBI TIME | if **stimecmp** CSR not available -|SBI IPI | -|SBI RFENCE | -|SBI HSM | -|SBI SRST | -|SBI PMU | -|=== - -- Required responsibilities of M-Mode runtime also includes - - ** Interrupt and Exception Delegation - ** Misaligned Load & Stores handling - ** Missing CSRs emulation - ** PMP Configuration +===== SBI
-- Wherever applicable firmware must implement UEFI interfaces over similar -interfaces and services present in the SBI specification. For example, UEFI -runtime services must implement ResetSystem() via SBI Reset extension. +* The M-mode runtime must implement SBI specification version 0.3 + or higher +* Required SBI extensions include: +** SBI TIME +** SBI IPI +** SBI RFENCE +** SBI HSM +** SBI SRST +** SBI PMU +* Required features of the M-Mode runtime also includes +** Delegate interrupts and exceptions to S-mode +** Handle misaligned load and store +** Emulate missing CSRs +** Configure PMP CSRs
===== UEFI -- OS should prioritize calling the UEFI interfaces before the SBI or Platform -specific mechanisms. + +* Wherever applicable UEFI firmware must implement UEFI interfaces over + similar interfaces and services present in the SBI specification. For + example, the UEFI ResetSystem() service must be implemented via the + SBI System Reset Extension. +* The operating system should prioritize calling the UEFI interfaces before + the SBI or platform specific mechanisms.
// Server extension for OS-A Platform === Server Extension @@ -676,8 +673,6 @@ process. |===
===== Runtime services -====== SBI -*TBD*
====== UEFI The UEFI run time services listed below are required to be implemented.
