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charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <131BBACE35371733+d5902eda-c4ea-b74d-a17c-70fd1a166b6f@tinylab.org> Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Wed, Jun 21, 2023 at 04:15:07PM +0800, Song Shuai wrote: > > > 在 2023/6/21 15:22, Alexandre Ghiti 写道: > > This document describes the constraints and requirements of the early > > boot process in a RISC-V kernel. > > > > Signed-off-by: Alexandre Ghiti > > Reviewed-by: Björn Töpel > > --- > > Documentation/riscv/boot-image-header.rst | 3 - > > Documentation/riscv/boot.rst | 170 ++++++++++++++++++++++ > > Documentation/riscv/index.rst | 1 + > > 3 files changed, 171 insertions(+), 3 deletions(-) > > create mode 100644 Documentation/riscv/boot.rst > > > > diff --git a/Documentation/riscv/boot-image-header.rst b/Documentation/riscv/boot-image-header.rst > > index d7752533865f..a4a45310c4c4 100644 > > --- a/Documentation/riscv/boot-image-header.rst > > +++ b/Documentation/riscv/boot-image-header.rst > > @@ -7,9 +7,6 @@ Boot image header in RISC-V Linux > > This document only describes the boot image header details for RISC-V Linux. > > -TODO: > > - Write a complete booting guide. > > - > > The following 64-byte header is present in decompressed Linux kernel image:: > > u32 code0; /* Executable code */ > > diff --git a/Documentation/riscv/boot.rst b/Documentation/riscv/boot.rst > > new file mode 100644 > > index 000000000000..019ee818686d > > --- /dev/null > > +++ b/Documentation/riscv/boot.rst > > @@ -0,0 +1,170 @@ > > +.. SPDX-License-Identifier: GPL-2.0 > > + > > +=============================================== > > +RISC-V Kernel Boot Requirements and Constraints > > +=============================================== > > + > > +:Author: Alexandre Ghiti > > +:Date: 23 May 2023 > > + > > +This document describes what the RISC-V kernel expects from bootloaders and > > +firmware, but also the constraints that any developer must have in mind when > > +touching the early boot process. For the purposes of this document, the > > +'early boot process' refers to any code that runs before the final virtual > > +mapping is set up. > > + > > +Pre-kernel Requirements and Constraints > > +======================================= > > + > > +The RISC-V kernel expects the following of bootloaders and platform firmware: > > + > > +Register state > > +-------------- > > + > > +The RISC-V kernel expects: > > + > > + * `$a0` to contain the hartid of the current core. > > + * `$a1` to contain the address of the devicetree in memory. > > + > > +CSR state > > +--------- > > + > > +The RISC-V kernel expects: > > + > > + * `$satp = 0`: the MMU, if present, must be disabled. > > + > > +Reserved memory for resident firmware > > +------------------------------------- > > + > > +The RISC-V kernel must not map any resident memory, or memory protected with > > +PMPs, in the direct mapping, so the firmware must correctly mark those regions > > +as per the devicetree specification and/or the UEFI specification. > > + > > +Kernel location > > +--------------- > > + > > +The RISC-V kernel expects to be placed at a PMD boundary (2MB aligned for rv64 > > +and 4MB aligned for rv32). Note that the EFI stub will physically relocate the > > +kernel if that's not the case. > > + > > +Hardware description > > +-------------------- > > + > > +The firmware can pass either a devicetree or ACPI tables to the RISC-V kernel. > > + > > +The devicetree is either passed directly to the kernel from the previous stage > > +using the `$a1` register, or when booting with UEFI, it can be passed using the > > +EFI configuration table. > > + > > +The ACPI tables are passed to the kernel using the EFI configuration table. In > > +this case, a tiny devicetree is still created by the EFI stub. Please refer to > > +"EFI stub and devicetree" tree section below for details about this devicetree. > > + > > +Kernel entrance > > +--------------- > > + > > +On SMP systems, there are 2 methods to enter the kernel: > > + > > +- `RISCV_BOOT_SPINWAIT`: the firmware releases all harts in the kernel, one hart > > + wins a lottery and executes the early boot code while the other harts are > > + parked waiting for the initialization to finish. This method is mostly used to > > + support older firmwares without SBI HSM extension and M-mode RISC-V kernel. > > +- `Ordered booting`: the firmware releases only one hart that will execute the > > + initialization phase and then will start all other harts using the SBI HSM > > + extension. The ordered booting method is the preferred booting method for > > + booting the RISC-V kernel because it can support cpu hotplug and kexec. > > + > > +UEFI > > +---- > > + > > +UEFI memory map > > +~~~~~~~~~~~~~~~ > > + > > +When booting with UEFI, the RISC-V kernel will use only the EFI memory map to > > +populate the system memory. > > + > > +The UEFI firmware must parse the subnodes of the `/reserved-memory` devicetree > > +node and abide by the devicetree specification to convert the attributes of > > +those subnodes (`no-map` and `reusable`) into their correct EFI equivalent > > +(refer to section "3.5.4 /reserved-memory and UEFI" of the devicetree > > +specification v0.4-rc1). > append this note ? > > Note that RISC-V edk2 diverges from the devicetree specification to declare > the !no-map regions as EfiReservedMemoryType instead of EfiBootServicesData. > > + Not required. It will be fixed in EDK2. 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, Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= Subject: Re: [PATCH v2 2/3] Documentation: riscv: Add early boot document Message-ID: References: <20230621072234.9900-1-alexghiti@rivosinc.com> <20230621072234.9900-2-alexghiti@rivosinc.com> <131BBACE35371733+d5902eda-c4ea-b74d-a17c-70fd1a166b6f@tinylab.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <131BBACE35371733+d5902eda-c4ea-b74d-a17c-70fd1a166b6f@tinylab.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230621_021845_165090_FEF38A87 X-CRM114-Status: GOOD ( 36.97 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 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