From patchwork Thu Sep 17 22:37:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Atish Patra X-Patchwork-Id: 11783675 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6AE69746 for ; Thu, 17 Sep 2020 22:38:09 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2F8AF2087D for ; Thu, 17 Sep 2020 22:38:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="nyOcFgIh"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="Xa+uUh4D" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2F8AF2087D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=wdc.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=cgljlQJxeNX8Ca1m4EIdKduG/ntgdh0G1txGqZw391A=; b=nyOcFgIhO+WyArsk2diYzvYjr xJm3Wia0XrtD3jUvU1Fw6K8Jo5Wtnf2JNM6z5P1XvOVgugf6Inl2xkq4b6uji7AD+hz+pPz7mpatt cwW13e/m0xIyx1GlHvtZzTSbqnOSeQNJsoqKV92SqNn0fIsheh1xv2HIyeVx/6kiFb7Ys02UUVtgF Eda58jRmUBVwXhdZ15Jl9QUKDfv2xciyhIEp48kl2+yEO43WY2WZpTUtH2ND8wtA7YXGQk5ydcxFa mij6mhvZJ8ngyWn3GQWlON1TdFaXlBsdidHm/XvrVAgZ2dunKrMe5Gbj1dWHgwxOdlRPNdvH3sQ3j Pt0WtpBUg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kJ2XH-0005kn-Ph; Thu, 17 Sep 2020 22:37:51 +0000 Received: from esa1.hgst.iphmx.com ([68.232.141.245]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kJ2X9-0005gG-J1 for linux-riscv@lists.infradead.org; Thu, 17 Sep 2020 22:37:46 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1600382263; x=1631918263; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=zxXH2/7YI+PwGAWZtomJ4Dd84mp5VM0rgEr3PoVuYe8=; b=Xa+uUh4DZB9abxaVhBpzI8x4oLgeL/kZwAUYrrHLzflUaWiG7PtFjz6j NvbxNxz6DA0KcSTT5lrCuYeh8KIXB8BHwN6+tFsfZ5FmGiOHg9NXGc6pP Hj1dX8F1fhblUMxqR3yeJlc/SIXja696ah3djtRBsfeqyKSIp23jWvo8c i1Xh0dNBb4j4M5jIREgNAIIw6qwSa+FHrAYhqu5iyaaTnGUQrXEa0NBaE 5EAwwPExtpCAIvNbcFs/uSXiRC8u6eqy9p6bv8wyf+iKKklVmX8VwFssQ gQxJBgq4ww3oipXGAyIhzCHiEm7/vH1+Q5VXLDHTDkVU9JKkX3mWfit/U Q==; IronPort-SDR: r7Cp+GwJBrSOlYObmVZL1i5k9JfQnup3YmDwLxVudi9vWkduJKcHDdbhULpFIa1mZxN4o8ggfP /PkLuwf5ZrgiLn15AXl8if+vsC1FEdePxtV7VYloIVbdIGdYgU3J4jaJ6xmOPVG5qbKwJ2W9Q9 HgC+QOP1hJ0lSGXJrdM8vNJBpMZf8N7Mb9y7BciO4gNa1WUtpR4cf8PTLuddOdPaRTBVJvboAK zm6onoqh78PoTIreC8utjM6Y1L7anNSBglh9icOi2NWiw/kwtNvSST715k1BfHwYQ6xt5wH9Xz Xk0= X-IronPort-AV: E=Sophos;i="5.77,272,1596470400"; d="scan'208";a="257336259" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 18 Sep 2020 06:37:41 +0800 IronPort-SDR: 4CwhpSzFKspyFlNGP67lX8V/sekBmeFkIqXpnM1rJ2i85to8w/P8nWoxaMdtldn/wstXmWIOxN M8EEcTqplf0g== Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Sep 2020 15:23:55 -0700 IronPort-SDR: 3M5TTOgDa/WKmIQJOtZfHQzqKowTMYrkgXSd1JVb2yYsqCH6xvLdljR82hW9K0miW+L9HYoNvL r6txRRc4kZmg== WDCIronportException: Internal Received: from use204338.ad.shared (HELO jedi-01.hgst.com) ([10.86.60.39]) by uls-op-cesaip02.wdc.com with ESMTP; 17 Sep 2020 15:37:40 -0700 From: Atish Patra To: linux-kernel@vger.kernel.org Subject: [PATCH v8 5/7] RISC-V: Add EFI stub support. Date: Thu, 17 Sep 2020 15:37:14 -0700 Message-Id: <20200917223716.2300238-6-atish.patra@wdc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200917223716.2300238-1-atish.patra@wdc.com> References: <20200917223716.2300238-1-atish.patra@wdc.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200917_183743_802984_D368CAAE X-CRM114-Status: GOOD ( 33.81 ) X-Spam-Score: -2.5 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [68.232.141.245 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-efi@vger.kernel.org, Palmer Dabbelt , Atish Patra , Arvind Sankar , Maxim Uvarov , Alistair Francis , Zong Li , linux-riscv@lists.infradead.org, Ingo Molnar , Masahiro Yamada , Michal Simek , Ard Biesheuvel , Greentime Hu , Borislav Petkov , Albert Ou , Kees Cook , Heiko Carstens , Paul Walmsley , Thomas Gleixner , Anup Patel , Nick Desaulniers , Palmer Dabbelt , Andrew Morton , Mike Rapoport Sender: "linux-riscv" Errors-To: linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org Add a RISC-V architecture specific stub code that actually copies the actual kernel image to a valid address and jump to it after boot services are terminated. Enable UEFI related kernel configs as well for RISC-V. Signed-off-by: Atish Patra Link: https://lore.kernel.org/r/20200421033336.9663-4-atish.patra@wdc.com [ardb: - move hartid fetch into check_platform_features() - use image_size not reserve_size - select ISA_C - do not use dram_base] Signed-off-by: Ard Biesheuvel Signed-off-by: Palmer Dabbelt --- arch/riscv/Kconfig | 22 +++++ arch/riscv/Makefile | 1 + arch/riscv/configs/defconfig | 1 + arch/riscv/include/asm/efi.h | 35 +++++++ drivers/firmware/efi/Kconfig | 3 +- drivers/firmware/efi/libstub/Makefile | 10 ++ drivers/firmware/efi/libstub/riscv-stub.c | 109 ++++++++++++++++++++++ 7 files changed, 180 insertions(+), 1 deletion(-) create mode 100644 arch/riscv/include/asm/efi.h create mode 100644 drivers/firmware/efi/libstub/riscv-stub.c diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 5e4ace64acbc..6ef2394be857 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -401,6 +401,26 @@ config CMDLINE_FORCE endchoice +config EFI_STUB + bool + +config EFI + bool "UEFI runtime support" + depends on OF + select LIBFDT + select UCS2_STRING + select EFI_PARAMS_FROM_FDT + select EFI_STUB + select EFI_GENERIC_STUB + select RISCV_ISA_C + default y + help + This option provides support for runtime services provided + by UEFI firmware (such as non-volatile variables, realtime + clock, and platform reset). A UEFI stub is also provided to + allow the kernel to be booted as an EFI application. This + is only useful on systems that have UEFI firmware. + endmenu config BUILTIN_DTB @@ -413,3 +433,5 @@ menu "Power management options" source "kernel/power/Kconfig" endmenu + +source "drivers/firmware/Kconfig" diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index fb6e37db836d..10df59f28add 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -80,6 +80,7 @@ head-y := arch/riscv/kernel/head.o core-y += arch/riscv/ libs-y += arch/riscv/lib/ +libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a PHONY += vdso_install vdso_install: diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig index d58c93efb603..d222d353d86d 100644 --- a/arch/riscv/configs/defconfig +++ b/arch/riscv/configs/defconfig @@ -130,3 +130,4 @@ CONFIG_DEBUG_BLOCK_EXT_DEVT=y # CONFIG_RUNTIME_TESTING_MENU is not set CONFIG_MEMTEST=y # CONFIG_SYSFS_SYSCALL is not set +CONFIG_EFI=y diff --git a/arch/riscv/include/asm/efi.h b/arch/riscv/include/asm/efi.h new file mode 100644 index 000000000000..bf6a40e20a8e --- /dev/null +++ b/arch/riscv/include/asm/efi.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020 Western Digital Corporation or its affiliates. + */ +#ifndef _ASM_EFI_H +#define _ASM_EFI_H + +#include +#include +#include +#include + +/* on RISC-V, the FDT may be located anywhere in system RAM */ +static inline unsigned long efi_get_max_fdt_addr(unsigned long image_addr) +{ + return ULONG_MAX; +} + +/* Load initrd at enough distance from DRAM start */ +static inline unsigned long efi_get_max_initrd_addr(unsigned long image_addr) +{ + return image_addr + SZ_256M; +} + +#define alloc_screen_info(x...) (&screen_info) + +static inline void free_screen_info(struct screen_info *si) +{ +} + +static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt) +{ +} + +#endif /* _ASM_EFI_H */ diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig index 3939699e62fe..a29fbd6e657e 100644 --- a/drivers/firmware/efi/Kconfig +++ b/drivers/firmware/efi/Kconfig @@ -111,7 +111,7 @@ config EFI_GENERIC_STUB config EFI_ARMSTUB_DTB_LOADER bool "Enable the DTB loader" - depends on EFI_GENERIC_STUB + depends on EFI_GENERIC_STUB && !RISCV default y help Select this config option to add support for the dtb= command @@ -128,6 +128,7 @@ config EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER bool "Enable the command line initrd loader" if !X86 depends on EFI_STUB && (EFI_GENERIC_STUB || X86) default y + depends on !RISCV help Select this config option to add support for the initrd= command line parameter, allowing an initrd that resides on the same volume diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile index 296b18fbd7a2..e9fc2ddabd5f 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -22,6 +22,8 @@ cflags-$(CONFIG_ARM64) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ cflags-$(CONFIG_ARM) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ -fno-builtin -fpic \ $(call cc-option,-mno-single-pic-base) +cflags-$(CONFIG_RISCV) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ + -fpic cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt @@ -63,6 +65,7 @@ lib-$(CONFIG_EFI_GENERIC_STUB) += efi-stub.o fdt.o string.o \ lib-$(CONFIG_ARM) += arm32-stub.o lib-$(CONFIG_ARM64) += arm64-stub.o lib-$(CONFIG_X86) += x86-stub.o +lib-$(CONFIG_RISCV) += riscv-stub.o CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) @@ -106,6 +109,13 @@ STUBCOPY_FLAGS-$(CONFIG_ARM64) += --prefix-alloc-sections=.init \ --prefix-symbols=__efistub_ STUBCOPY_RELOC-$(CONFIG_ARM64) := R_AARCH64_ABS +# For RISC-V, we don't need anything special other than arm64. Keep all the +# symbols in .init section and make sure that no absolute symbols references +# doesn't exist. +STUBCOPY_FLAGS-$(CONFIG_RISCV) += --prefix-alloc-sections=.init \ + --prefix-symbols=__efistub_ +STUBCOPY_RELOC-$(CONFIG_RISCV) := R_RISCV_HI20 + $(obj)/%.stub.o: $(obj)/%.o FORCE $(call if_changed,stubcopy) diff --git a/drivers/firmware/efi/libstub/riscv-stub.c b/drivers/firmware/efi/libstub/riscv-stub.c new file mode 100644 index 000000000000..380e4e251399 --- /dev/null +++ b/drivers/firmware/efi/libstub/riscv-stub.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020 Western Digital Corporation or its affiliates. + */ + +#include +#include + +#include +#include + +#include "efistub.h" + +/* + * RISC-V requires the kernel image to placed 2 MB aligned base for 64 bit and + * 4MB for 32 bit. + */ +#ifdef CONFIG_64BIT +#define MIN_KIMG_ALIGN SZ_2M +#else +#define MIN_KIMG_ALIGN SZ_4M +#endif + +typedef void __noreturn (*jump_kernel_func)(unsigned int, unsigned long); + +static u32 hartid; + +static u32 get_boot_hartid_from_fdt(void) +{ + const void *fdt; + int chosen_node, len; + const fdt32_t *prop; + + fdt = get_efi_config_table(DEVICE_TREE_GUID); + if (!fdt) + return U32_MAX; + + chosen_node = fdt_path_offset(fdt, "/chosen"); + if (chosen_node < 0) + return U32_MAX; + + prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len); + if (!prop || len != sizeof(u32)) + return U32_MAX; + + return fdt32_to_cpu(*prop); +} + +efi_status_t check_platform_features(void) +{ + hartid = get_boot_hartid_from_fdt(); + if (hartid == U32_MAX) { + efi_err("/chosen/boot-hartid missing or invalid!\n"); + return EFI_UNSUPPORTED; + } + return EFI_SUCCESS; +} + +void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt, + unsigned long fdt_size) +{ + unsigned long stext_offset = _start_kernel - _start; + unsigned long kernel_entry = entrypoint + stext_offset; + jump_kernel_func jump_kernel = (jump_kernel_func)kernel_entry; + + /* + * Jump to real kernel here with following constraints. + * 1. MMU should be disabled. + * 2. a0 should contain hartid + * 3. a1 should DT address + */ + csr_write(CSR_SATP, 0); + jump_kernel(hartid, fdt); +} + +efi_status_t handle_kernel_image(unsigned long *image_addr, + unsigned long *image_size, + unsigned long *reserve_addr, + unsigned long *reserve_size, + efi_loaded_image_t *image) +{ + unsigned long kernel_size = 0; + unsigned long preferred_addr; + efi_status_t status; + + kernel_size = _edata - _start; + *image_addr = (unsigned long)_start; + *image_size = kernel_size + (_end - _edata); + + /* + * RISC-V kernel maps PAGE_OFFSET virtual address to the same physical + * address where kernel is booted. That's why kernel should boot from + * as low as possible to avoid wastage of memory. Currently, dram_base + * is occupied by the firmware. So the preferred address for kernel to + * boot is next aligned address. If preferred address is not available, + * relocate_kernel will fall back to efi_low_alloc_above to allocate + * lowest possible memory region as long as the address and size meets + * the alignment constraints. + */ + preferred_addr = MIN_KIMG_ALIGN; + status = efi_relocate_kernel(image_addr, kernel_size, *image_size, + preferred_addr, MIN_KIMG_ALIGN, 0x0); + + if (status != EFI_SUCCESS) { + efi_err("Failed to relocate kernel\n"); + *image_size = 0; + } + return status; +}