On Wed, 2021-08-11 at 10:39 +0530, Anup Patel wrote:
We should follow profile naming as-per latest RISC-V profiles specification. Also, we should avoid explicit mentions of "RV32xxx" and "RV64xxx" ISA strings.
diff --git a/riscv-platform-spec.adoc b/riscv-platform-spec.adoc index d466c9c..27a23ca 100644 --- a/riscv-platform-spec.adoc +++ b/riscv-platform-spec.adoc @@ -35,8 +35,9 @@ toc::[] |RVA22 | RISC-V Application 2022 <<spec_profiles>> |EE | Execution Environment |OSPM | Operating System Power Management -|RV32GC | RISC-V 32-bit general purpose ISA described as RV32IMAFDC. -|RV64GC | RISC-V 64-bit general purpose ISA described as RV64IMAFDC. +|RVA22U64 | RISC-V 2022 user-mode profile <<spec_profiles>> +|RVA22S64 | RISC-V 2022 supervisor-mode profile <<spec_profiles>> +|RVA22M64 | RISC-V 2022 machine-mode profile <<spec_profiles>> |RAS | Reliability, Availability, and Serviceability |CLINT | Legacy Core-Local Interrupt Controller |ACLINT | Advanced Core-Local Interrupt Controller <<spec_aclint>> @@ -96,8 +97,12 @@ The M platform has the following extensions: // Base feature set for OS-A Platform === Base ==== Architecture + +The OS-A platform must comply with the RVA22U, RVA22S and RVA22M profiles +defined by the RISC-V profiles specification <<spec_profiles>> with the +following additional requirements: + * ISA Requirements -** The OS-A platform is required to comply with the RVA22 profile. ** Within main-memory regions, aligned instruction fetch must be atomic, up to the smaller of ILEN and XLEN bits. In particular, if an aligned 4- byte word is stored with the `sw` instruction, then any processor attempts to execute @@ -426,9 +431,6 @@ systems. discovery mechanism, etc. - The requirements are operating system agnostic, specific firmware/bootloader implementation agnostic. -- Any RV32GC or RV64GC platform seeking compatibility with the base -specification is required to implement all three privilege modes i.e. M, S and -U mode. - For the generic mandatory requirements this base specification will refer to the EBBR Specification. Any deviation from the EBBR will be explicitly mentioned in the requirements. @@ -490,14 +492,13 @@ promotes interoperability.
// Server extension for OS-A Platform === Server Extension -The server extension specifies additional requirements for RV64I based server -class platforms. The server extension includes all of the requirements for the +The server extension specifies additional requirements for server class +platforms. The server extension includes all of the requirements for the base with the additional requirements as below.
==== Architecture The platforms which conform to server extension are required to implement +
-* RV64 support * The `time` CSR must be implemented in hardware * The Sstc extension <<spec_priv_sstc>> must be implemented * RISC-V ISA H-extension with following additional requirements: @@ -554,9 +555,9 @@ following additional requirements:
==== Boot and Runtime Requirements ===== Firmware -The boot and system firmware for the RV64I server platforms required to be -based on UEFI as per the base specification with some additional -requirements as mentioned below. +The boot and system firmware for the server platforms must support UEFI as +defined in by the OS-A base platform with some additional requirements +described in following sub-setions.
====== PCIe support The platforms are required to implement *EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL* and other @@ -585,10 +586,10 @@ the base spec requirements.
====== ACPI
-For RV64I server platforms, ACPI tables are required to be passed via UEFI -to the operating system for the purpose of discovery and the configuration of -the hardware. This section defines the required ACPI tables and objects. All -other ACPI tables for RISC-V can be implemented as needed adhering to the ACPI +For server platforms, ACPI tables are required to be passed via UEFI to the +operating system for the purpose of discovery and the configuration of the +hardware. This section defines the required ACPI tables and objects. All other +ACPI tables for RISC-V can be implemented as needed adhering to the ACPI spec version 6.4+(RISC-V support when added).
In ACPI namespace, processors are required to be defined under the System Bus @@ -972,11 +973,8 @@ although they do not have to in order to meet the specification.
=== Base ==== Architecture -The M Platform specification depends on the RVM22 specification and all -requirements from RVM22 must be met. - -Any RISC-V system that uses at least RV32/64G can meet the M Platform -specification. +The M Platform must comply with the RVM22M profile defined by the RISC-V +profiles specification <<spec_profiles>>.
==== Interrupt Controller Embedded systems are recommended to use a spec compliant PLIC <<spec_plic>>,