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[2620:137:e000::1:20]) by mx.google.com with ESMTP id go31-20020a1709070d9f00b006f3cea934edsi1772257ejc.917.2022.05.16.20.29.31; Mon, 16 May 2022 20:29:57 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=SDhHYxjY; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236634AbiEOMih (ORCPT + 99 others); Sun, 15 May 2022 08:38:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51466 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234838AbiEOMie (ORCPT ); Sun, 15 May 2022 08:38:34 -0400 Received: from mail-vs1-xe2a.google.com (mail-vs1-xe2a.google.com [IPv6:2607:f8b0:4864:20::e2a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A3EB275D4; Sun, 15 May 2022 05:38:29 -0700 (PDT) Received: by mail-vs1-xe2a.google.com with SMTP id y74so12889062vsy.7; Sun, 15 May 2022 05:38:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=gfkbMmk8wyZ+ot1wQRLuDLFskAEpe8DDAFw8n0s/9os=; b=SDhHYxjYv8kNiOHuRJD/w4nMBnFqCnR8EfN8OoE109nRhBnqQKO07TwkhQCw2akb88 D5u+kq/pV2iQcudd+kbQQQYGg7aIfmBspaRyoPrpQryqay5KJIQxBtZ64vjEQ9eFMOZH UdBIop6zXuMKrpX8FGOHgrurNCciRcmIMo31AIGXULD1vPBzW4EWFrYQHDobU9YDARlo qrxXP8qUTZTj8dVoRQ0vxqgpwf707bIy0vesC33I/LAi4fa3g4Zgf2lcgSJdtpp13tt2 FRlbICZ0cmCj2+ylXecWlXsWiW/UzMWtZeE7rGEfvKK8LYVIEyJicunVLVRF7qtGAgiS lUDQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=gfkbMmk8wyZ+ot1wQRLuDLFskAEpe8DDAFw8n0s/9os=; b=jGN8WP85LFWpAJPqcLH82MnAuzDrDAWgsG7o0tFIcMSjAsmzlzrt9+2qy/X6qyOMqt XzClu4jHxada3Abd3BMVPuC0jUNTlCnNLgncFr9ZYjekepza99QoQZgzOTALkKlxpTFA DAdJeywO9WhNV6csfohkboZojo1c61Z/wbTIKijBNf3JiCaEKU0coglhSx5J8ZC8fO0V lgpdVWi+gEXxHdKv8PhgU0pdeESlc/2P+ZypCX52ArvZmP99GX/sD+pgL1rGYIvUBaNM 1YVeFDmSz6kaWR7vmpoOUj/biWKM5R2J38JEP7cic8MMoo+5p86laWQY/qxyl6jUi4QB yGiw== X-Gm-Message-State: AOAM5330XN1KXG8UU3CdOpbX7zI9RTYQDTEJN20MsC0A6yih9GN1EhDG GGLQFGcd6leL7bv48cQdfneqb3x01Gr/fy+cZZc= X-Received: by 2002:a67:ea4f:0:b0:328:1db4:d85c with SMTP id r15-20020a67ea4f000000b003281db4d85cmr4530018vso.20.1652618307857; Sun, 15 May 2022 05:38:27 -0700 (PDT) MIME-Version: 1.0 References: <20220514080402.2650181-1-chenhuacai@loongson.cn> <20220514080402.2650181-10-chenhuacai@loongson.cn> In-Reply-To: From: Huacai Chen Date: Sun, 15 May 2022 20:38:14 +0800 Message-ID: Subject: Re: [PATCH V10 09/22] LoongArch: Add boot and setup routines To: WANG Xuerui Cc: Huacai Chen , Arnd Bergmann , Andy Lutomirski , Thomas Gleixner , Peter Zijlstra , Andrew Morton , David Airlie , Jonathan Corbet , Linus Torvalds , linux-arch , "open list:DOCUMENTATION" , LKML , Xuefeng Li , Yanteng Si , Guo Ren , Jiaxun Yang , Stephen Rothwell , linux-efi , Ard Biesheuvel Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Xuerui, On Sun, May 15, 2022 at 4:45 PM WANG Xuerui wrote: > > Hi, > > On 5/14/22 16:03, Huacai Chen wrote: > > Add basic boot, setup and reset routines for LoongArchi support. > > typo -- "LoongArchi". > > This sentence could just be "Add basic boot, setup and reset routines > for LoongArch". > > > LoongArch uses UEFI-based firmware. The firmware uses ACPI and DMI/ > > SMBIOS to pass configuration information to the Linux kernel. > "The firmware passes configuration information to the kernel via ACPI > and DMI/SMBIOS." > > > > Now the boot information passed to kernel is like this: > > 1, kernel get 2 register values (a0 and a1) from bootloader. > > 2, a0 is a "efi boot flag" to distinguish UEFI BIOS and non-UEFI BIOS. > > 3, a1 is a "fdt pointer", including systable, memmap, cmdline and initr= d > > information. > > This paragraph is hopelessly Chinglish, let me reword a bit: > > Currently an ad-hoc interface between the kernel and the bootloader is > implemented. Kernel gets 2 values from the bootloader, passed in > registers a0 and a1; a0 is an "EFI boot flag" distinguishing UEFI and > non-UEFI firmware, while a1 is a pointer to an FDT with systable, > memmap, cmdline and initrd information. > > > > > The above interface is an internal interface between bootloader (grub, > > efistub, etc.) and the raw kernel. You can use this method to boot the > > Linux kernel in raw elf format, but it is recommend to use the standard > > UEFI boot protocol (efistub). > This interface is used by existing bootloaders for booting kernels in > raw ELF format. However, the standard UEFI boot protocol (EFISTUB) is > preferred down the road. Thank you for helping me to improve the words. > > > > ECR for adding LoongArch support in ACPI: > > https://mantis.uefi.org/mantis/view.php?id=3D2203 > > > > ECR for adding LoongArch support in ACPI (version update): > > https://mantis.uefi.org/mantis/view.php?id=3D2268 > > > > ECR for adding LoongArch support in UEFI: > > https://mantis.uefi.org/mantis/view.php?id=3D2313 > > > > ACPI changes of LoongArch have been approved in the last year, but the > > new version of ACPI SPEC hasn't been made public yet. And UEFI changes > > of LoongArch are under review now. > > > > Cc: linux-efi@vger.kernel.org > > Cc: Ard Biesheuvel > > Signed-off-by: Huacai Chen > > --- > > arch/loongarch/include/asm/acenv.h | 17 + > > arch/loongarch/include/asm/acpi.h | 38 ++ > > arch/loongarch/include/asm/bootinfo.h | 41 +++ > > arch/loongarch/include/asm/dmi.h | 24 ++ > > arch/loongarch/include/asm/efi.h | 41 +++ > > arch/loongarch/include/asm/reboot.h | 10 + > > arch/loongarch/include/asm/setup.h | 21 ++ > > arch/loongarch/kernel/acpi.c | 338 +++++++++++++++++ > > arch/loongarch/kernel/cacheinfo.c | 122 ++++++ > > arch/loongarch/kernel/cpu-probe.c | 292 +++++++++++++++ > > arch/loongarch/kernel/efi-header.S | 100 +++++ > > arch/loongarch/kernel/efi.c | 229 ++++++++++++ > > arch/loongarch/kernel/env.c | 70 ++++ > > arch/loongarch/kernel/head.S | 97 +++++ > > arch/loongarch/kernel/image-vars.h | 29 ++ > > arch/loongarch/kernel/mem.c | 64 ++++ > > arch/loongarch/kernel/reset.c | 90 +++++ > > arch/loongarch/kernel/setup.c | 348 +++++++++++++++++= + > > arch/loongarch/kernel/time.c | 220 +++++++++++ > > arch/loongarch/kernel/topology.c | 13 + > > drivers/firmware/efi/Kconfig | 2 +- > > drivers/firmware/efi/libstub/Makefile | 10 + > > .../firmware/efi/libstub/efi-stub-helper.c | 2 +- > > drivers/firmware/efi/libstub/efi-stub.c | 2 +- > > drivers/firmware/efi/libstub/loongarch-stub.c | 87 +++++ > > include/linux/efi.h | 1 + > > include/linux/pe.h | 1 + > > 27 files changed, 2306 insertions(+), 3 deletions(-) > > create mode 100644 arch/loongarch/include/asm/acenv.h > > create mode 100644 arch/loongarch/include/asm/acpi.h > > create mode 100644 arch/loongarch/include/asm/bootinfo.h > > create mode 100644 arch/loongarch/include/asm/dmi.h > > create mode 100644 arch/loongarch/include/asm/efi.h > > create mode 100644 arch/loongarch/include/asm/reboot.h > > create mode 100644 arch/loongarch/include/asm/setup.h > > create mode 100644 arch/loongarch/kernel/acpi.c > > create mode 100644 arch/loongarch/kernel/cacheinfo.c > > create mode 100644 arch/loongarch/kernel/cpu-probe.c > > create mode 100644 arch/loongarch/kernel/efi-header.S > > create mode 100644 arch/loongarch/kernel/efi.c > > create mode 100644 arch/loongarch/kernel/env.c > > create mode 100644 arch/loongarch/kernel/head.S > > create mode 100644 arch/loongarch/kernel/image-vars.h > > create mode 100644 arch/loongarch/kernel/mem.c > > create mode 100644 arch/loongarch/kernel/reset.c > > create mode 100644 arch/loongarch/kernel/setup.c > > create mode 100644 arch/loongarch/kernel/time.c > > create mode 100644 arch/loongarch/kernel/topology.c > > create mode 100644 drivers/firmware/efi/libstub/loongarch-stub.c > > > > diff --git a/arch/loongarch/include/asm/acenv.h b/arch/loongarch/includ= e/asm/acenv.h > > new file mode 100644 > > index 000000000000..290a15a41258 > > --- /dev/null > > +++ b/arch/loongarch/include/asm/acenv.h > > @@ -0,0 +1,17 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * LoongArch specific ACPICA environments and implementation > > + * > > + * Author: Jianmin Lv > > + * Huacai Chen > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > + > > +#ifndef _ASM_LOONGARCH_ACENV_H > > +#define _ASM_LOONGARCH_ACENV_H > > + > > +/* The head file is required by ACPI core, but we have nothing to fill > > + * it now, update it later when needed. > > + */ > > + > > +#endif /* _ASM_LOONGARCH_ACENV_H */ > > diff --git a/arch/loongarch/include/asm/acpi.h b/arch/loongarch/include= /asm/acpi.h > > new file mode 100644 > > index 000000000000..62044cd5b7bc > > --- /dev/null > > +++ b/arch/loongarch/include/asm/acpi.h > > @@ -0,0 +1,38 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Author: Jianmin Lv > > + * Huacai Chen > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > + > > +#ifndef _ASM_LOONGARCH_ACPI_H > > +#define _ASM_LOONGARCH_ACPI_H > > + > > +#ifdef CONFIG_ACPI > > +extern int acpi_strict; > > +extern int acpi_disabled; > > +extern int acpi_pci_disabled; > > +extern int acpi_noirq; > > + > > +#define acpi_os_ioremap acpi_os_ioremap > > +void __init __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_= size size); > > + > > +static inline void disable_acpi(void) > > +{ > > + acpi_disabled =3D 1; > > + acpi_pci_disabled =3D 1; > > + acpi_noirq =3D 1; > > +} > > + > > +static inline bool acpi_has_cpu_in_madt(void) > > +{ > > + return true; > > +} > > + > > +extern struct list_head acpi_wakeup_device_list; > > + > > +#endif /* !CONFIG_ACPI */ > > + > > +#define ACPI_TABLE_UPGRADE_MAX_PHYS ARCH_LOW_ADDRESS_LIMIT > > + > > +#endif /* _ASM_LOONGARCH_ACPI_H */ > > diff --git a/arch/loongarch/include/asm/bootinfo.h b/arch/loongarch/inc= lude/asm/bootinfo.h > > new file mode 100644 > > index 000000000000..0076a9e1a817 > > --- /dev/null > > +++ b/arch/loongarch/include/asm/bootinfo.h > > @@ -0,0 +1,41 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > +#ifndef _ASM_BOOTINFO_H > > +#define _ASM_BOOTINFO_H > > + > > +#include > > +#include > > + > > +const char *get_system_type(void); > > + > > +extern void init_environ(void); > > +extern void memblock_init(void); > > +extern void platform_init(void); > > + > > +struct loongson_board_info { > > + int bios_size; > > + char *bios_vendor; > > + char *bios_version; > > + char *bios_release_date; > > + char *board_name; > > + char *board_vendor; > > +}; > > + > > +struct loongson_system_configuration { > > + int nr_cpus; > > + int nr_nodes; > > + int nr_io_pics; > > + int boot_cpu_id; > > + int cores_per_node; > > + int cores_per_package; > > + char *cpuname; > > +}; > > + > > +extern u64 efi_system_table; > > +extern struct loongson_board_info b_info; > > +extern struct loongson_system_configuration loongson_sysconf; > > +extern unsigned long fw_arg0, fw_arg1, fw_arg2; > > + > > +#endif /* _ASM_BOOTINFO_H */ > > diff --git a/arch/loongarch/include/asm/dmi.h b/arch/loongarch/include/= asm/dmi.h > > new file mode 100644 > > index 000000000000..605493417753 > > --- /dev/null > > +++ b/arch/loongarch/include/asm/dmi.h > > @@ -0,0 +1,24 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > +#ifndef _ASM_DMI_H > > +#define _ASM_DMI_H > > + > > +#include > > +#include > > + > > +#define dmi_early_remap(x, l) dmi_remap(x, l) > > +#define dmi_early_unmap(x, l) dmi_unmap(x) > > +#define dmi_alloc(l) memblock_alloc(l, PAGE_SIZE) > > + > > +static inline void *dmi_remap(u64 phys_addr, unsigned long size) > > +{ > > + return ((void *)TO_CACHE(phys_addr)); > > +} > > + > > +static inline void dmi_unmap(void *addr) > > +{ > > +} > > + > > +#endif /* _ASM_DMI_H */ > > diff --git a/arch/loongarch/include/asm/efi.h b/arch/loongarch/include/= asm/efi.h > > new file mode 100644 > > index 000000000000..319c50ac8b33 > > --- /dev/null > > +++ b/arch/loongarch/include/asm/efi.h > > @@ -0,0 +1,41 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > +#ifndef _ASM_LOONGARCH_EFI_H > > +#define _ASM_LOONGARCH_EFI_H > > + > > +#include > > + > > +void __init efi_init(void); > > +void __init efi_runtime_init(void); > > +void efifb_setup_from_dmi(struct screen_info *si, const char *opt); > > + > > +#define ARCH_EFI_IRQ_FLAGS_MASK 0x00000001 /*bit0: CP0 Status.IE*/ > > Stray MIPS-ism that is wrong for LoongArch as well. This needs to refer > to CSR.CRMD.IE which is the bit 2: > > #define ARCH_EFI_IRQ_FLAGS_MASK 0x00000004 /* bit 2: CSR.CRMD.IE */ OK, thanks, this is my mistake. > > > + > > +#define arch_efi_call_virt_setup() \ > > +({ \ > > +}) > > + > > +#define arch_efi_call_virt(p, f, args...) \ > > +({ \ > > + efi_##f##_t * __f; \ > > + __f =3D p->f; \ > > + __f(args); \ > > +}) > > + > > +#define arch_efi_call_virt_teardown() \ > > +({ \ > > +}) > > + > > +#define EFI_ALLOC_ALIGN SZ_64K > > + > > +struct screen_info *alloc_screen_info(void); > > +void free_screen_info(struct screen_info *si); > > + > > +static inline unsigned long efi_get_max_initrd_addr(unsigned long imag= e_addr) > > +{ > > + return ULONG_MAX; > > +} > > + > > +#endif /* _ASM_LOONGARCH_EFI_H */ > > diff --git a/arch/loongarch/include/asm/reboot.h b/arch/loongarch/inclu= de/asm/reboot.h > > new file mode 100644 > > index 000000000000..51151749d8f0 > > --- /dev/null > > +++ b/arch/loongarch/include/asm/reboot.h > > @@ -0,0 +1,10 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > +#ifndef _ASM_REBOOT_H > > +#define _ASM_REBOOT_H > > + > > +extern void (*pm_restart)(void); > > + > > +#endif /* _ASM_REBOOT_H */ > > diff --git a/arch/loongarch/include/asm/setup.h b/arch/loongarch/includ= e/asm/setup.h > > new file mode 100644 > > index 000000000000..6d7d2a3e23dd > > --- /dev/null > > +++ b/arch/loongarch/include/asm/setup.h > > @@ -0,0 +1,21 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > + > > +#ifndef _LOONGARCH_SETUP_H > > +#define _LOONGARCH_SETUP_H > > + > > +#include > > +#include > > + > > +#define VECSIZE 0x200 > > + > > +extern unsigned long eentry; > > +extern unsigned long tlbrentry; > > +extern void cpu_cache_init(void); > > +extern void per_cpu_trap_init(int cpu); > > +extern void set_handler(unsigned long offset, void *addr, unsigned lon= g len); > > +extern void set_merr_handler(unsigned long offset, void *addr, unsigne= d long len); > > + > > +#endif /* __SETUP_H */ > > diff --git a/arch/loongarch/kernel/acpi.c b/arch/loongarch/kernel/acpi.= c > > new file mode 100644 > > index 000000000000..506ab9912c51 > > --- /dev/null > > +++ b/arch/loongarch/kernel/acpi.c > > @@ -0,0 +1,338 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * acpi.c - Architecture-Specific Low-Level ACPI Boot Support > > + * > > + * Author: Jianmin Lv > > + * Huacai Chen > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +int acpi_disabled; > > +EXPORT_SYMBOL(acpi_disabled); > > +int acpi_noirq; > > +int acpi_pci_disabled; > > +EXPORT_SYMBOL(acpi_pci_disabled); > > +int acpi_strict =3D 1; /* We have no workarounds on LoongArch */ > > +int num_processors; > > +int disabled_cpus; > > +enum acpi_irq_model_id acpi_irq_model =3D ACPI_IRQ_MODEL_PLATFORM; > > + > > +u64 acpi_saved_sp; > > + > > +#define MAX_CORE_PIC 256 > > + > > +#define PREFIX "ACPI: " > > + > > +int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp) > > +{ > > + if (irqp !=3D NULL) > > + *irqp =3D acpi_register_gsi(NULL, gsi, -1, -1); > > + return (*irqp >=3D 0) ? 0 : -EINVAL; > > +} > > +EXPORT_SYMBOL_GPL(acpi_gsi_to_irq); > > + > > +int acpi_isa_irq_to_gsi(unsigned int isa_irq, u32 *gsi) > > +{ > > + if (gsi) > > + *gsi =3D isa_irq; > > + return 0; > > +} > > + > > +/* > > + * success: return IRQ number (>=3D0) > > + * failure: return < 0 > > + */ > > +int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int po= larity) > > +{ > > + int id; > > + struct irq_fwspec fwspec; > > + > > + switch (gsi) { > > + case GSI_MIN_CPU_IRQ ... GSI_MAX_CPU_IRQ: > > + fwspec.fwnode =3D liointc_domain->fwnode; > > + fwspec.param[0] =3D gsi - GSI_MIN_CPU_IRQ; > > + fwspec.param_count =3D 1; > > + > > + return irq_create_fwspec_mapping(&fwspec); > > + > > + case GSI_MIN_LPC_IRQ ... GSI_MAX_LPC_IRQ: > > + if (!pch_lpc_domain) > > + return -EINVAL; > > + > > + fwspec.fwnode =3D pch_lpc_domain->fwnode; > > + fwspec.param[0] =3D gsi - GSI_MIN_LPC_IRQ; > > + fwspec.param[1] =3D acpi_dev_get_irq_type(trigger, polari= ty); > > + fwspec.param_count =3D 2; > > + > > + return irq_create_fwspec_mapping(&fwspec); > > + > > + case GSI_MIN_PCH_IRQ ... GSI_MAX_PCH_IRQ: > > + id =3D find_pch_pic(gsi); > > + if (id < 0) > > + return -EINVAL; > > + > > + fwspec.fwnode =3D pch_pic_domain[id]->fwnode; > > + fwspec.param[0] =3D gsi - acpi_pchpic[id]->gsi_base; > > + fwspec.param[1] =3D IRQ_TYPE_LEVEL_HIGH; > > + fwspec.param_count =3D 2; > > + > > + return irq_create_fwspec_mapping(&fwspec); > > + } > > + > > + return -EINVAL; > > +} > > +EXPORT_SYMBOL_GPL(acpi_register_gsi); > > + > > +void acpi_unregister_gsi(u32 gsi) > > +{ > > + > > +} > > +EXPORT_SYMBOL_GPL(acpi_unregister_gsi); > > + > > +void __init __iomem * __acpi_map_table(unsigned long phys, unsigned lo= ng size) > > +{ > > + > > + if (!phys || !size) > > + return NULL; > > + > > + return early_memremap(phys, size); > > +} > > +void __init __acpi_unmap_table(void __iomem *map, unsigned long size) > > +{ > > + if (!map || !size) > > + return; > > + > > + early_memunmap(map, size); > > +} > > + > > +void __init __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_= size size) > > +{ > > + if (!memblock_is_memory(phys)) > > + return ioremap(phys, size); > > + else > > + return ioremap_cache(phys, size); > > +} > > + > > +void __init acpi_boot_table_init(void) > > +{ > > + /* > > + * If acpi_disabled, bail out > > + */ > > + if (acpi_disabled) > > + return; > > + > > + /* > > + * Initialize the ACPI boot-time table parser. > > + */ > > + if (acpi_table_init()) { > > + disable_acpi(); > > + return; > > + } > > +} > > + > > +static int __init > > +acpi_parse_cpuintc(union acpi_subtable_headers *header, const unsigned= long end) > > +{ > > + struct acpi_madt_core_pic *processor =3D NULL; > > + > > + processor =3D (struct acpi_madt_core_pic *)header; > > + if (BAD_MADT_ENTRY(processor, end)) > > + return -EINVAL; > > + > > + acpi_table_print_madt_entry(&header->common); > > + > > + return 0; > > +} > > + > > +static int __init > > +acpi_parse_liointc(union acpi_subtable_headers *header, const unsigned= long end) > > +{ > > + struct acpi_madt_lio_pic *liointc =3D NULL; > > + > > + liointc =3D (struct acpi_madt_lio_pic *)header; > > + > > + if (BAD_MADT_ENTRY(liointc, end)) > > + return -EINVAL; > > + > > + acpi_liointc =3D liointc; > > + > > + return 0; > > +} > > + > > +static int __init > > +acpi_parse_eiointc(union acpi_subtable_headers *header, const unsigned= long end) > > +{ > > + static int id =3D 0; > > + struct acpi_madt_eio_pic *eiointc =3D NULL; > > + > > + eiointc =3D (struct acpi_madt_eio_pic *)header; > > + > > + if (BAD_MADT_ENTRY(eiointc, end)) > > + return -EINVAL; > > + > > + acpi_eiointc[id++] =3D eiointc; > > + loongson_sysconf.nr_io_pics =3D id; > > + > > + return 0; > > +} > > + > > +static int __init > > +acpi_parse_htintc(union acpi_subtable_headers *header, const unsigned = long end) > > +{ > > + struct acpi_madt_ht_pic *htintc =3D NULL; > > + > > + htintc =3D (struct acpi_madt_ht_pic *)header; > > + > > + if (BAD_MADT_ENTRY(htintc, end)) > > + return -EINVAL; > > + > > + acpi_htintc =3D htintc; > > + loongson_sysconf.nr_io_pics =3D 1; > > + > > + return 0; > > +} > > + > > +static int __init > > +acpi_parse_pch_pic(union acpi_subtable_headers *header, const unsigned= long end) > > +{ > > + static int id =3D 0; > > + struct acpi_madt_bio_pic *pchpic =3D NULL; > > + > > + pchpic =3D (struct acpi_madt_bio_pic *)header; > > + > > + if (BAD_MADT_ENTRY(pchpic, end)) > > + return -EINVAL; > > + > > + acpi_pchpic[id++] =3D pchpic; > > + > > + return 0; > > +} > > + > > +static int __init > > +acpi_parse_pch_msi(union acpi_subtable_headers *header, const unsigned= long end) > > +{ > > + static int id =3D 0; > > + struct acpi_madt_msi_pic *pchmsi =3D NULL; > > + > > + pchmsi =3D (struct acpi_madt_msi_pic *)header; > > + > > + if (BAD_MADT_ENTRY(pchmsi, end)) > > + return -EINVAL; > > + > > + acpi_pchmsi[id++] =3D pchmsi; > > + > > + return 0; > > +} > > + > > +static int __init > > +acpi_parse_pch_lpc(union acpi_subtable_headers *header, const unsigned= long end) > > +{ > > + struct acpi_madt_lpc_pic *pchlpc =3D NULL; > > + > > + pchlpc =3D (struct acpi_madt_lpc_pic *)header; > > + > > + if (BAD_MADT_ENTRY(pchlpc, end)) > > + return -EINVAL; > > + > > + acpi_pchlpc =3D pchlpc; > > + > > + return 0; > > +} > > + > > +static void __init acpi_process_madt(void) > > +{ > > + int error; > > + > > + /* Parse MADT CPUINTC entries */ > > + error =3D acpi_table_parse_madt(ACPI_MADT_TYPE_CORE_PIC, acpi_par= se_cpuintc, MAX_CORE_PIC); > > + if (error < 0) { > > + disable_acpi(); > > + pr_err(PREFIX "Invalid BIOS MADT (CPUINTC entries), ACPI = disabled\n"); > > + return; > > + } > > + > > + loongson_sysconf.nr_cpus =3D num_processors; > > + > > + /* Parse MADT LIOINTC entries */ > > + error =3D acpi_table_parse_madt(ACPI_MADT_TYPE_LIO_PIC, acpi_pars= e_liointc, 1); > > + if (error < 0) { > > + disable_acpi(); > > + pr_err(PREFIX "Invalid BIOS MADT (LIOINTC entries), ACPI = disabled\n"); > > + return; > > + } > > + > > + /* Parse MADT EIOINTC entries */ > > + error =3D acpi_table_parse_madt(ACPI_MADT_TYPE_EIO_PIC, acpi_pars= e_eiointc, MAX_IO_PICS); > > + if (error < 0) { > > + disable_acpi(); > > + pr_err(PREFIX "Invalid BIOS MADT (EIOINTC entries), ACPI = disabled\n"); > > + return; > > + } > > + > > + /* Parse MADT HTVEC entries */ > > + error =3D acpi_table_parse_madt(ACPI_MADT_TYPE_HT_PIC, acpi_parse= _htintc, 1); > > + if (error < 0) { > > + disable_acpi(); > > + pr_err(PREFIX "Invalid BIOS MADT (HTVEC entries), ACPI di= sabled\n"); > > + return; > > + } > > + > > + /* Parse MADT PCHPIC entries */ > > + error =3D acpi_table_parse_madt(ACPI_MADT_TYPE_BIO_PIC, acpi_pars= e_pch_pic, MAX_IO_PICS); > > + if (error < 0) { > > + disable_acpi(); > > + pr_err(PREFIX "Invalid BIOS MADT (PCHPIC entries), ACPI d= isabled\n"); > > + return; > > + } > > + > > + /* Parse MADT PCHMSI entries */ > > + error =3D acpi_table_parse_madt(ACPI_MADT_TYPE_MSI_PIC, acpi_pars= e_pch_msi, MAX_IO_PICS); > > + if (error < 0) { > > + disable_acpi(); > > + pr_err(PREFIX "Invalid BIOS MADT (PCHMSI entries), ACPI d= isabled\n"); > > + return; > > + } > > + > > + /* Parse MADT PCHLPC entries */ > > + error =3D acpi_table_parse_madt(ACPI_MADT_TYPE_LPC_PIC, acpi_pars= e_pch_lpc, 1); > > + if (error < 0) { > > + disable_acpi(); > > + pr_err(PREFIX "Invalid BIOS MADT (PCHLPC entries), ACPI d= isabled\n"); > > + return; > > + } > > +} > > + > > +int __init acpi_boot_init(void) > > +{ > > + /* > > + * If acpi_disabled, bail out > > + */ > > + if (acpi_disabled) > > + return -1; > > + > > + loongson_sysconf.boot_cpu_id =3D read_csr_cpuid(); > > + > > + /* > > + * Process the Multiple APIC Description Table (MADT), if present > > + */ > > + acpi_process_madt(); > > + > > + /* Do not enable ACPI SPCR console by default */ > > + acpi_parse_spcr(earlycon_acpi_spcr_enable, false); > > + > > + return 0; > > +} > > + > > +void __init arch_reserve_mem_area(acpi_physical_address addr, size_t s= ize) > > +{ > > + memblock_reserve(addr, size); > > +} > > diff --git a/arch/loongarch/kernel/cacheinfo.c b/arch/loongarch/kernel/= cacheinfo.c > > new file mode 100644 > > index 000000000000..8c9fe29e98f0 > > --- /dev/null > > +++ b/arch/loongarch/kernel/cacheinfo.c > > @@ -0,0 +1,122 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > +/* > > + * LoongArch cacheinfo support > > + * > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > +#include > > + > > +/* Populates leaf and increments to next leaf */ > > +#define populate_cache(cache, leaf, c_level, c_type) \ > > +do { \ > > + leaf->type =3D c_type; \ > > + leaf->level =3D c_level; \ > > + leaf->coherency_line_size =3D c->cache.linesz; \ > > + leaf->number_of_sets =3D c->cache.sets; \ > > + leaf->ways_of_associativity =3D c->cache.ways; \ > > + leaf->size =3D c->cache.linesz * c->cache.sets * \ > > + c->cache.ways; \ > > + leaf++; \ > > +} while (0) > > + > > +int init_cache_level(unsigned int cpu) > > +{ > > + struct cpuinfo_loongarch *c =3D ¤t_cpu_data; > > + struct cpu_cacheinfo *this_cpu_ci =3D get_cpu_cacheinfo(cpu); > > + int levels =3D 0, leaves =3D 0; > > + > > + /* > > + * If Dcache is not set, we assume the cache structures > > + * are not properly initialized. > > + */ > > + if (c->dcache.waysize) > > + levels +=3D 1; > > + else > > + return -ENOENT; > > + > > + > > + leaves +=3D (c->icache.waysize) ? 2 : 1; > > + > > + if (c->vcache.waysize) { > > + levels++; > > + leaves++; > > + } > > + > > + if (c->scache.waysize) { > > + levels++; > > + leaves++; > > + } > > + > > + if (c->tcache.waysize) { > > + levels++; > > + leaves++; > > + } > > + > > + this_cpu_ci->num_levels =3D levels; > > + this_cpu_ci->num_leaves =3D leaves; > > + return 0; > > +} > > + > > +static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf= , > > + struct cacheinfo *sib_leaf) > > +{ > > + return !((this_leaf->level =3D=3D 1) || (this_leaf->level =3D=3D = 2)); > > +} > > + > > +static void cache_cpumap_setup(unsigned int cpu) > > +{ > > + struct cpu_cacheinfo *this_cpu_ci =3D get_cpu_cacheinfo(cpu); > > + struct cacheinfo *this_leaf, *sib_leaf; > > + unsigned int index; > > + > > + for (index =3D 0; index < this_cpu_ci->num_leaves; index++) { > > + unsigned int i; > > + > > + this_leaf =3D this_cpu_ci->info_list + index; > > + /* skip if shared_cpu_map is already populated */ > > + if (!cpumask_empty(&this_leaf->shared_cpu_map)) > > + continue; > > + > > + cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map); > > + for_each_online_cpu(i) { > > + struct cpu_cacheinfo *sib_cpu_ci =3D get_cpu_cach= einfo(i); > > + > > + if (i =3D=3D cpu || !sib_cpu_ci->info_list) > > + continue;/* skip if itself or no cacheinf= o */ > > + sib_leaf =3D sib_cpu_ci->info_list + index; > > + if (cache_leaves_are_shared(this_leaf, sib_leaf))= { > > + cpumask_set_cpu(cpu, &sib_leaf->shared_cp= u_map); > > + cpumask_set_cpu(i, &this_leaf->shared_cpu= _map); > > + } > > + } > > + } > > +} > > + > > +int populate_cache_leaves(unsigned int cpu) > > +{ > > + int level =3D 1; > > + struct cpuinfo_loongarch *c =3D ¤t_cpu_data; > > + struct cpu_cacheinfo *this_cpu_ci =3D get_cpu_cacheinfo(cpu); > > + struct cacheinfo *this_leaf =3D this_cpu_ci->info_list; > > + > > + if (c->icache.waysize) { > > + populate_cache(dcache, this_leaf, level, CACHE_TYPE_DATA)= ; > > + populate_cache(icache, this_leaf, level++, CACHE_TYPE_INS= T); > > + } else { > > + populate_cache(dcache, this_leaf, level++, CACHE_TYPE_UNI= FIED); > > + } > > + > > + if (c->vcache.waysize) > > + populate_cache(vcache, this_leaf, level++, CACHE_TYPE_UNI= FIED); > > + > > + if (c->scache.waysize) > > + populate_cache(scache, this_leaf, level++, CACHE_TYPE_UNI= FIED); > > + > > + if (c->tcache.waysize) > > + populate_cache(tcache, this_leaf, level++, CACHE_TYPE_UNI= FIED); > > + > > + cache_cpumap_setup(cpu); > > + this_cpu_ci->cpu_map_populated =3D true; > > + > > + return 0; > > +} > > diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/= cpu-probe.c > > new file mode 100644 > > index 000000000000..ad1c4cde0dd6 > > --- /dev/null > > +++ b/arch/loongarch/kernel/cpu-probe.c > > @@ -0,0 +1,292 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Processor capabilities determination functions. > > + * > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +/* Hardware capabilities */ > > +unsigned int elf_hwcap __read_mostly; > > +EXPORT_SYMBOL_GPL(elf_hwcap); > > + > > +/* > > + * Determine the FCSR mask for FPU hardware. > > + */ > > +static inline void cpu_set_fpu_fcsr_mask(struct cpuinfo_loongarch *c) > > +{ > > + unsigned long sr, mask, fcsr, fcsr0, fcsr1; > > + > > + fcsr =3D c->fpu_csr0; > > + mask =3D FPU_CSR_ALL_X | FPU_CSR_ALL_E | FPU_CSR_ALL_S | FPU_CSR_= RM; > > + > > + sr =3D read_csr_euen(); > > + enable_fpu(); > > + > > + fcsr0 =3D fcsr & mask; > > + write_fcsr(LOONGARCH_FCSR0, fcsr0); > > + fcsr0 =3D read_fcsr(LOONGARCH_FCSR0); > > + > > + fcsr1 =3D fcsr | ~mask; > > + write_fcsr(LOONGARCH_FCSR0, fcsr1); > > + fcsr1 =3D read_fcsr(LOONGARCH_FCSR0); > > + > > + write_fcsr(LOONGARCH_FCSR0, fcsr); > > + > > + write_csr_euen(sr); > > + > > + c->fpu_mask =3D ~(fcsr0 ^ fcsr1) & ~mask; > > +} > > + > > +static inline void set_elf_platform(int cpu, const char *plat) > > +{ > > + if (cpu =3D=3D 0) > > + __elf_platform =3D plat; > > +} > > + > > +/* MAP BASE */ > > +unsigned long vm_map_base; > > +EXPORT_SYMBOL_GPL(vm_map_base); > > + > > +static void cpu_probe_addrbits(struct cpuinfo_loongarch *c) > > +{ > > +#ifdef __NEED_ADDRBITS_PROBE > > + c->pabits =3D (read_cpucfg(LOONGARCH_CPUCFG1) & CPUCFG1_PABITS) >= > 4; > > + c->vabits =3D (read_cpucfg(LOONGARCH_CPUCFG1) & CPUCFG1_VABITS) >= > 12; > > + vm_map_base =3D 0UL - (1UL << c->vabits); > > +#endif > > +} > > + > > +static void set_isa(struct cpuinfo_loongarch *c, unsigned int isa) > > +{ > > + switch (isa) { > > + case LOONGARCH_CPU_ISA_LA64: > > + c->isa_level |=3D LOONGARCH_CPU_ISA_LA64; > > + fallthrough; > > + case LOONGARCH_CPU_ISA_LA32S: > > + c->isa_level |=3D LOONGARCH_CPU_ISA_LA32S; > > + fallthrough; > > + case LOONGARCH_CPU_ISA_LA32R: > > + c->isa_level |=3D LOONGARCH_CPU_ISA_LA32R; > > + break; > > + } > > +} > > + > > +static void cpu_probe_common(struct cpuinfo_loongarch *c) > > +{ > > + unsigned int config; > > + unsigned long asid_mask; > > + > > + c->options =3D LOONGARCH_CPU_CPUCFG | LOONGARCH_CPU_CSR | > > + LOONGARCH_CPU_TLB | LOONGARCH_CPU_VINT | LOONGARCH_C= PU_WATCH; > > + > > + elf_hwcap |=3D HWCAP_LOONGARCH_CRC32; > > + > > + config =3D read_cpucfg(LOONGARCH_CPUCFG1); > > + if (config & CPUCFG1_UAL) { > > + c->options |=3D LOONGARCH_CPU_UAL; > > + elf_hwcap |=3D HWCAP_LOONGARCH_UAL; > > + } > > + > > + config =3D read_cpucfg(LOONGARCH_CPUCFG2); > > + if (config & CPUCFG2_LAM) { > > + c->options |=3D LOONGARCH_CPU_LAM; > > + elf_hwcap |=3D HWCAP_LOONGARCH_LAM; > > + } > > + if (config & CPUCFG2_FP) { > > + c->options |=3D LOONGARCH_CPU_FPU; > > + elf_hwcap |=3D HWCAP_LOONGARCH_FPU; > > + } > > + if (config & CPUCFG2_COMPLEX) { > > + c->options |=3D LOONGARCH_CPU_COMPLEX; > > + elf_hwcap |=3D HWCAP_LOONGARCH_COMPLEX; > > + } > > + if (config & CPUCFG2_CRYPTO) { > > + c->options |=3D LOONGARCH_CPU_CRYPTO; > > + elf_hwcap |=3D HWCAP_LOONGARCH_CRYPTO; > > + } > > + if (config & CPUCFG2_LVZP) { > > + c->options |=3D LOONGARCH_CPU_LVZ; > > + elf_hwcap |=3D HWCAP_LOONGARCH_LVZ; > > + } > > + > > + config =3D read_cpucfg(LOONGARCH_CPUCFG6); > > + if (config & CPUCFG6_PMP) > > + c->options |=3D LOONGARCH_CPU_PMP; > > + > > + config =3D iocsr_readl(LOONGARCH_IOCSR_FEATURES); > > + if (config & IOCSRF_CSRIPI) > > + c->options |=3D LOONGARCH_CPU_CSRIPI; > > + if (config & IOCSRF_EXTIOI) > > + c->options |=3D LOONGARCH_CPU_EXTIOI; > > + if (config & IOCSRF_FREQSCALE) > > + c->options |=3D LOONGARCH_CPU_SCALEFREQ; > > + if (config & IOCSRF_FLATMODE) > > + c->options |=3D LOONGARCH_CPU_FLATMODE; > > + if (config & IOCSRF_EIODECODE) > > + c->options |=3D LOONGARCH_CPU_EIODECODE; > > + if (config & IOCSRF_VM) > > + c->options |=3D LOONGARCH_CPU_HYPERVISOR; > > + > > + config =3D csr_readl(LOONGARCH_CSR_ASID); > > + config =3D (config & CSR_ASID_BIT) >> CSR_ASID_BIT_SHIFT; > > + asid_mask =3D GENMASK(config - 1, 0); > > + set_cpu_asid_mask(c, asid_mask); > > + > > + config =3D read_csr_prcfg1(); > > + c->kscratch_mask =3D GENMASK((config & CSR_CONF1_KSNUM) - 1, 0); > > + c->kscratch_mask &=3D ~(EXC_KSCRATCH_MASK | PERCPU_KSCRATCH_MASK = | KVM_KSCRATCH_MASK); > > + > > + config =3D read_csr_prcfg3(); > > + switch (config & CSR_CONF3_TLBTYPE) { > > + case 0: > > + c->tlbsizemtlb =3D 0; > > + c->tlbsizestlbsets =3D 0; > > + c->tlbsizestlbways =3D 0; > > + c->tlbsize =3D 0; > > + break; > > + case 1: > > + c->tlbsizemtlb =3D ((config & CSR_CONF3_MTLBSIZE) >> CSR_= CONF3_MTLBSIZE_SHIFT) + 1; > > + c->tlbsizestlbsets =3D 0; > > + c->tlbsizestlbways =3D 0; > > + c->tlbsize =3D c->tlbsizemtlb + c->tlbsizestlbsets * c->t= lbsizestlbways; > > + break; > > + case 2: > > + c->tlbsizemtlb =3D ((config & CSR_CONF3_MTLBSIZE) >> CSR_= CONF3_MTLBSIZE_SHIFT) + 1; > > + c->tlbsizestlbsets =3D 1 << ((config & CSR_CONF3_STLBIDX)= >> CSR_CONF3_STLBIDX_SHIFT); > > + c->tlbsizestlbways =3D ((config & CSR_CONF3_STLBWAYS) >> = CSR_CONF3_STLBWAYS_SHIFT) + 1; > > + c->tlbsize =3D c->tlbsizemtlb + c->tlbsizestlbsets * c->t= lbsizestlbways; > > + break; > > + default: > > + pr_warn("Warning: unimplemented tlb type\n"); > > + } > > +} > > + > > +#define MAX_NAME_LEN 32 > > +#define VENDOR_OFFSET 0 > > +#define CPUNAME_OFFSET 9 > > + > > +static char cpu_full_name[MAX_NAME_LEN] =3D " - "; > > + > > +static inline void cpu_probe_loongson(struct cpuinfo_loongarch *c, uns= igned int cpu) > > +{ > > + uint64_t *vendor =3D (void *)(&cpu_full_name[VENDOR_OFFSET]); > > + uint64_t *cpuname =3D (void *)(&cpu_full_name[CPUNAME_OFFSET]); > > + > > + __cpu_full_name[cpu] =3D cpu_full_name; > > + *vendor =3D iocsr_readq(LOONGARCH_IOCSR_VENDOR); > > + *cpuname =3D iocsr_readq(LOONGARCH_IOCSR_CPUNAME); > > + > > + switch (c->processor_id & PRID_SERIES_MASK) { > > + case PRID_SERIES_LA132: > > + c->cputype =3D CPU_LOONGSON32; > > + set_isa(c, LOONGARCH_CPU_ISA_LA32S); > > + __cpu_family[cpu] =3D "Loongson-32bit"; > > + pr_info("32-bit Loongson Processor probed (LA132 Core)\n"= ); > > + break; > > + case PRID_SERIES_LA264: > > + c->cputype =3D CPU_LOONGSON64; > > + set_isa(c, LOONGARCH_CPU_ISA_LA64); > > + __cpu_family[cpu] =3D "Loongson-64bit"; > > + pr_info("64-bit Loongson Processor probed (LA264 Core)\n"= ); > > + break; > > + case PRID_SERIES_LA364: > > + c->cputype =3D CPU_LOONGSON64; > > + set_isa(c, LOONGARCH_CPU_ISA_LA64); > > + __cpu_family[cpu] =3D "Loongson-64bit"; > > + pr_info("64-bit Loongson Processor probed (LA364 Core)\n"= ); > > + break; > > + case PRID_SERIES_LA464: > > + c->cputype =3D CPU_LOONGSON64; > > + set_isa(c, LOONGARCH_CPU_ISA_LA64); > > + __cpu_family[cpu] =3D "Loongson-64bit"; > > + pr_info("64-bit Loongson Processor probed (LA464 Core)\n"= ); > > + break; > > + case PRID_SERIES_LA664: > > + c->cputype =3D CPU_LOONGSON64; > > + set_isa(c, LOONGARCH_CPU_ISA_LA64); > > + __cpu_family[cpu] =3D "Loongson-64bit"; > > + pr_info("64-bit Loongson Processor probed (LA664 Core)\n"= ); > > + break; > > + default: /* Default to 64 bit */ > > + c->cputype =3D CPU_LOONGSON64; > > + set_isa(c, LOONGARCH_CPU_ISA_LA64); > > + __cpu_family[cpu] =3D "Loongson-64bit"; > > + pr_info("64-bit Loongson Processor probed (Unknown Core)\= n"); > > + } > > +} > > + > > +#ifdef CONFIG_64BIT > > +/* For use by uaccess.h */ > > +u64 __ua_limit; > > +EXPORT_SYMBOL(__ua_limit); > > +#endif > > + > > +const char *__cpu_family[NR_CPUS]; > > +const char *__cpu_full_name[NR_CPUS]; > > +const char *__elf_platform; > > + > > +static void cpu_report(void) > > +{ > > + struct cpuinfo_loongarch *c =3D ¤t_cpu_data; > > + > > + pr_info("CPU%d revision is: %08x (%s)\n", > > + smp_processor_id(), c->processor_id, cpu_family_string())= ; > > + if (c->options & LOONGARCH_CPU_FPU) > > + pr_info("FPU%d revision is: %08x\n", smp_processor_id(), = c->fpu_vers); > > +} > > + > > +void cpu_probe(void) > > +{ > > + unsigned int cpu =3D smp_processor_id(); > > + struct cpuinfo_loongarch *c =3D ¤t_cpu_data; > > + > > + /* > > + * Set a default elf platform, cpu probe may later > > + * overwrite it with a more precise value > > + */ > > + set_elf_platform(cpu, "loongarch"); > > + > > + c->cputype =3D CPU_UNKNOWN; > > + c->processor_id =3D read_cpucfg(LOONGARCH_CPUCFG0); > > + c->fpu_vers =3D (read_cpucfg(LOONGARCH_CPUCFG2) >> 3) & 0x3; > > + > > + c->fpu_csr0 =3D FPU_CSR_RN; > > + c->fpu_mask =3D FPU_CSR_RSVD; > > + > > + cpu_probe_common(c); > > + > > + per_cpu_trap_init(cpu); > > + > > + switch (c->processor_id & PRID_COMP_MASK) { > > + case PRID_COMP_LOONGSON: > > + cpu_probe_loongson(c, cpu); > > + break; > > + } > > + > > + BUG_ON(!__cpu_family[cpu]); > > + BUG_ON(c->cputype =3D=3D CPU_UNKNOWN); > > + > > + cpu_probe_addrbits(c); > > + > > +#ifdef CONFIG_64BIT > > + if (cpu =3D=3D 0) > > + __ua_limit =3D ~((1ull << cpu_vabits) - 1); > > +#endif > > + > > + cpu_report(); > > +} > > diff --git a/arch/loongarch/kernel/efi-header.S b/arch/loongarch/kernel= /efi-header.S > > new file mode 100644 > > index 000000000000..d299cac4e691 > > --- /dev/null > > +++ b/arch/loongarch/kernel/efi-header.S > > @@ -0,0 +1,100 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > + > > +#include > > +#include > > + > > + .macro __EFI_PE_HEADER > > + .long PE_MAGIC > > +.Lcoff_header: > > + .short IMAGE_FILE_MACHINE_LOONGARCH /* Machine */ > > + .short .Lsection_count /* NumberOfSectio= ns */ > > + .long 0 /* TimeDateStamp = */ > > + .long 0 /* PointerToSymbo= lTable */ > > + .long 0 /* NumberOfSymbol= s */ > > + .short .Lsection_table - .Loptional_header /* SizeOfOptional= Header */ > > + .short IMAGE_FILE_DEBUG_STRIPPED | \ > > + IMAGE_FILE_EXECUTABLE_IMAGE | \ > > + IMAGE_FILE_LINE_NUMS_STRIPPED /* Characteristic= s */ > > + > > +.Loptional_header: > > + .short PE_OPT_MAGIC_PE32PLUS /* PE32+ format *= / > > + .byte 0x02 /* MajorLinkerVer= sion */ > > + .byte 0x14 /* MinorLinkerVer= sion */ > > + .long __inittext_end - .Lefi_header_end /* SizeOfCode */ > > + .long _end - __initdata_begin /* SizeOfInitiali= zedData */ > > + .long 0 /* SizeOfUninitia= lizedData */ > > + .long __efistub_efi_pe_entry - _head /* AddressOfEntry= Point */ > > + .long .Lefi_header_end - _head /* BaseOfCode */ > > + > > +.Lextra_header_fields: > > + .quad 0 /* ImageBase */ > > + .long PECOFF_SEGMENT_ALIGN /* SectionAlignme= nt */ > > + .long PECOFF_FILE_ALIGN /* FileAlignment = */ > > + .short 0 /* MajorOperating= SystemVersion */ > > + .short 0 /* MinorOperating= SystemVersion */ > > + .short LINUX_EFISTUB_MAJOR_VERSION /* MajorImageVers= ion */ > > + .short LINUX_EFISTUB_MINOR_VERSION /* MinorImageVers= ion */ > > + .short 0 /* MajorSubsystem= Version */ > > + .short 0 /* MinorSubsystem= Version */ > > + .long 0 /* Win32VersionVa= lue */ > > + > > + .long _end - _head /* SizeOfImage */ > > + > > + /* Everything before the kernel image is considered part of the h= eader */ > > + .long .Lefi_header_end - _head /* SizeOfHeaders = */ > > + .long 0 /* CheckSum */ > > + .short IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */ > > + .short 0 /* DllCharacteris= tics */ > > + .quad 0 /* SizeOfStackRes= erve */ > > + .quad 0 /* SizeOfStackCom= mit */ > > + .quad 0 /* SizeOfHeapRese= rve */ > > + .quad 0 /* SizeOfHeapComm= it */ > > + .long 0 /* LoaderFlags */ > > + .long (.Lsection_table - .) / 8 /* NumberOfRvaAnd= Sizes */ > > + > > + .quad 0 /* ExportTable */ > > + .quad 0 /* ImportTable */ > > + .quad 0 /* ResourceTable = */ > > + .quad 0 /* ExceptionTable= */ > > + .quad 0 /* CertificationT= able */ > > + .quad 0 /* BaseRelocation= Table */ > > + > > + /* Section table */ > > +.Lsection_table: > > + .ascii ".text\0\0\0" > > + .long __inittext_end - .Lefi_header_end /* VirtualSize */ > > + .long .Lefi_header_end - _head /* VirtualAddress= */ > > + .long __inittext_end - .Lefi_header_end /* SizeOfRawData = */ > > + .long .Lefi_header_end - _head /* PointerToRawDa= ta */ > > + > > + .long 0 /* PointerToReloc= ations */ > > + .long 0 /* PointerToLineN= umbers */ > > + .short 0 /* NumberOfReloca= tions */ > > + .short 0 /* NumberOfLineNu= mbers */ > > + .long IMAGE_SCN_CNT_CODE | \ > > + IMAGE_SCN_MEM_READ | \ > > + IMAGE_SCN_MEM_EXECUTE /* Characteristic= s */ > > + > > + .ascii ".data\0\0\0" > > + .long _end - __initdata_begin /* VirtualSize */ > > + .long __initdata_begin - _head /* VirtualAddress= */ > > + .long _edata - __initdata_begin /* SizeOfRawData = */ > > + .long __initdata_begin - _head /* PointerToRawDa= ta */ > > + > > + .long 0 /* PointerToReloc= ations */ > > + .long 0 /* PointerToLineN= umbers */ > > + .short 0 /* NumberOfReloca= tions */ > > + .short 0 /* NumberOfLineNu= mbers */ > > + .long IMAGE_SCN_CNT_INITIALIZED_DATA | \ > > + IMAGE_SCN_MEM_READ | \ > > + IMAGE_SCN_MEM_WRITE /* Characteristic= s */ > > + > > + .org 0x20e > > + .word kernel_version - 512 - _head > > + > > + .set .Lsection_count, (. - .Lsection_table) / 40 > > +.Lefi_header_end: > > + .endm > > diff --git a/arch/loongarch/kernel/efi.c b/arch/loongarch/kernel/efi.c > > new file mode 100644 > > index 000000000000..69ebdd4220ec > > --- /dev/null > > +++ b/arch/loongarch/kernel/efi.c > > @@ -0,0 +1,229 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * EFI initialization > > + * > > + * Author: Jianmin Lv > > + * Huacai Chen > > + * > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#include > > +#include > > +#include > > +#include > > + > > +static unsigned long efi_nr_tables; > > +static unsigned long efi_config_table; > > +static unsigned long screen_info_table __initdata =3D EFI_INVALID_TABL= E_ADDR; > > + > > +static efi_system_table_t *efi_systab; > > +static efi_config_table_type_t arch_tables[] __initdata =3D { > > + {LINUX_EFI_LARCH_SCREEN_INFO_TABLE_GUID, &screen_info_table, "SIN= FO"}, > > + {}, > > +}; > > + > > +static void __init init_screen_info(void) > > +{ > > + struct screen_info *si; > > + > > + if (screen_info_table =3D=3D EFI_INVALID_TABLE_ADDR) > > + return; > > + > > + si =3D early_memremap_ro(screen_info_table, sizeof(*si)); > > + if (!si) { > > + pr_err("Could not map screen_info config table\n"); > > + return; > > + } > > + screen_info =3D *si; > > + early_memunmap(si, sizeof(*si)); > > + > > + if (screen_info.orig_video_isVGA =3D=3D VIDEO_TYPE_EFI) > > + memblock_reserve(screen_info.lfb_base, screen_info.lfb_si= ze); > > +} > > + > > +static void __init create_tlb(u32 index, u64 vppn, u32 ps, u32 mat) > > +{ > > + unsigned long tlblo0, tlblo1; > > + > > + write_csr_pagesize(ps); > > + > > + tlblo0 =3D vppn | CSR_TLBLO0_V | CSR_TLBLO0_WE | > > + CSR_TLBLO0_GLOBAL | (mat << CSR_TLBLO0_CCA_SHIFT); > > + tlblo1 =3D tlblo0 + (1 << ps); > > + > > + csr_writeq(vppn, LOONGARCH_CSR_TLBEHI); > > + csr_writeq(tlblo0, LOONGARCH_CSR_TLBELO0); > > + csr_writeq(tlblo1, LOONGARCH_CSR_TLBELO1); > > + csr_xchgl(0, CSR_TLBIDX_EHINV, LOONGARCH_CSR_TLBIDX); > > + csr_xchgl(index, CSR_TLBIDX_IDX, LOONGARCH_CSR_TLBIDX); > > + > > + tlb_write_indexed(); > > +} > > + > > +#define MTLB_ENTRY_INDEX 0x800 > > + > > +/* Create VA =3D=3D PA mapping as UEFI */ > > +static void __init fix_efi_mapping(void) > > +{ > > + unsigned int index =3D MTLB_ENTRY_INDEX; > > + unsigned int tlbnr =3D boot_cpu_data.tlbsizemtlb - 2; > > + unsigned long i, vppn; > > + > > + /* Low Memory, Cached */ > > + create_tlb(index++, 0x00000000, PS_128M, 1); > > + /* MMIO Registers, Uncached */ > > + create_tlb(index++, 0x10000000, PS_128M, 0); > > + > > + /* High Memory, Cached */ > > + for (i =3D 0; i < tlbnr; i++) { > > + vppn =3D 0x80000000ULL + (i * SZ_2G); > > + create_tlb(index++, vppn, PS_1G, 1); > > + } > > +} > > + > > +/* > > + * set_virtual_map() - create a virtual mapping for the EFI memory map= and call > > + * efi_set_virtual_address_map enter virtual for runtime service > > + * > > + * This function populates the virt_addr fields of all memory region d= escriptors > > + * in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those des= criptors > > + * are also copied to @runtime_map, and their total count is returned = in @count. > > + */ > > +static unsigned int __init set_virtual_map(void) > > +{ > > + int count =3D 0; > > + unsigned int size; > > + unsigned long attr; > > + efi_status_t status; > > + efi_runtime_services_t *rt; > > + efi_set_virtual_address_map_t *svam; > > + efi_memory_desc_t *in, runtime_map[32]; > > + > > + size =3D sizeof(efi_memory_desc_t); > > + > > + for_each_efi_memory_desc(in) { > > + attr =3D in->attribute; > > + if (!(attr & EFI_MEMORY_RUNTIME)) > > + continue; > > + > > + if (attr & (EFI_MEMORY_WB | EFI_MEMORY_WT)) > > + in->virt_addr =3D TO_CACHE(in->phys_addr); > > + else > > + in->virt_addr =3D TO_UNCACHE(in->phys_addr); > > + > > + memcpy(&runtime_map[count++], in, size); > > + } > > + > > + rt =3D early_memremap_ro((unsigned long)efi_systab->runtime, size= of(*rt)); > > + > > + /* Install the new virtual address map */ > > + svam =3D rt->set_virtual_address_map; > > + > > + fix_efi_mapping(); > > + > > + status =3D svam(size * count, size, efi.memmap.desc_version, > > + (efi_memory_desc_t *)TO_PHYS((unsigned long)runti= me_map)); > > + > > + local_flush_tlb_all(); > > + write_csr_pagesize(PS_DEFAULT_SIZE); > > + > > + if (status !=3D EFI_SUCCESS) > > + return -1; > > + > > + return 0; > > +} > > + > > +void __init efi_runtime_init(void) > > +{ > > + efi_status_t status; > > + > > + if (!efi_enabled(EFI_BOOT)) > > + return; > > + > > + if (!efi_systab->runtime) > > + return; > > + > > + status =3D set_virtual_map(); > > + if (status < 0) > > + return; > > + > > + if (efi_runtime_disabled()) { > > + pr_info("EFI runtime services will be disabled.\n"); > > + return; > > + } > > + > > + efi.runtime =3D (efi_runtime_services_t *)efi_systab->runtime; > > + efi.runtime_version =3D (unsigned int)efi.runtime->hdr.revision; > > + > > + efi_native_runtime_setup(); > > + set_bit(EFI_RUNTIME_SERVICES, &efi.flags); > > +} > > + > > +void __init efi_init(void) > > +{ > > + int size; > > + void *config_tables; > > + > > + if (!efi_system_table) > > + return; > > + > > + efi_systab =3D (efi_system_table_t *)early_memremap_ro(efi_system= _table, sizeof(efi_systab)); > > + if (!efi_systab) { > > + pr_err("Can't find EFI system table.\n"); > > + return; > > + } > > + > > + set_bit(EFI_64BIT, &efi.flags); > > + efi_nr_tables =3D efi_systab->nr_tables; > > + efi_config_table =3D (unsigned long)efi_systab->tables; > > + > > + size =3D sizeof(efi_config_table_t); > > + config_tables =3D early_memremap(efi_config_table, efi_nr_tables = * size); > > + efi_config_parse_tables(config_tables, efi_systab->nr_tables, arc= h_tables); > > + early_memunmap(config_tables, efi_nr_tables * size); > > + > > + init_screen_info(); > > +} > > + > > +static ssize_t boardinfo_show(struct kobject *kobj, > > + struct kobj_attribute *attr, char *buf) > > +{ > > + return sprintf(buf, > > + "BIOS Information\n" > > + "Vendor\t\t\t: %s\n" > > + "Version\t\t\t: %s\n" > > + "ROM Size\t\t: %d KB\n" > > + "Release Date\t\t: %s\n\n" > > + "Board Information\n" > > + "Manufacturer\t\t: %s\n" > > + "Board Name\t\t: %s\n" > > + "Family\t\t\t: LOONGSON64\n\n", > > + b_info.bios_vendor, b_info.bios_version, > > + b_info.bios_size, b_info.bios_release_date, > > + b_info.board_vendor, b_info.board_name); > > +} > > + > > +static struct kobj_attribute boardinfo_attr =3D __ATTR(boardinfo, 0444= , > > + boardinfo_show, NULL= ); > > + > > +static int __init boardinfo_init(void) > > +{ > > + if (!efi_kobj) > > + return -EINVAL; > > + > > + return sysfs_create_file(efi_kobj, &boardinfo_attr.attr); > > +} > > +late_initcall(boardinfo_init); > > diff --git a/arch/loongarch/kernel/env.c b/arch/loongarch/kernel/env.c > > new file mode 100644 > > index 000000000000..bf2593f1e536 > > --- /dev/null > > +++ b/arch/loongarch/kernel/env.c > > @@ -0,0 +1,70 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Author: Huacai Chen > > + * > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +u64 efi_system_table; > > +struct loongson_system_configuration loongson_sysconf; > > +EXPORT_SYMBOL(loongson_sysconf); > > + > > +u64 loongson_chipcfg[MAX_PACKAGES]; > > +u64 loongson_chiptemp[MAX_PACKAGES]; > > +u64 loongson_freqctrl[MAX_PACKAGES]; > > +unsigned long long smp_group[MAX_PACKAGES]; > > + > > +static void __init register_addrs_set(u64 *registers, const u64 addr, = int num) > > +{ > > + u64 i; > > + > > + for (i =3D 0; i < num; i++) { > > + *registers =3D (i << 44) | addr; > > + registers++; > > + } > > +} > > + > > +void __init init_environ(void) > > +{ > > + int efi_boot =3D fw_arg0; > > + struct efi_memory_map_data data; > > + void *fdt_ptr =3D early_memremap_ro(fw_arg1, SZ_64K); > > + > > + if (efi_boot) > > + set_bit(EFI_BOOT, &efi.flags); > > + else > > + clear_bit(EFI_BOOT, &efi.flags); > > + > > + early_init_dt_scan(fdt_ptr); > > + early_init_fdt_reserve_self(); > > + efi_system_table =3D efi_get_fdt_params(&data); > > + > > + efi_memmap_init_early(&data); > > + memblock_reserve(data.phys_map & PAGE_MASK, > > + PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MA= SK))); > > + > > + register_addrs_set(smp_group, TO_UNCACHE(0x1fe01000), 16); > > + register_addrs_set(loongson_chipcfg, TO_UNCACHE(0x1fe00180), 16); > > + register_addrs_set(loongson_chiptemp, TO_UNCACHE(0x1fe0019c), 16)= ; > > + register_addrs_set(loongson_freqctrl, TO_UNCACHE(0x1fe001d0), 16)= ; > > +} > > + > > +static int __init init_cpu_fullname(void) > > +{ > > + int cpu; > > + > > + if (loongson_sysconf.cpuname && !strncmp(loongson_sysconf.cpuname= , "Loongson", 8)) { > > + for (cpu =3D 0; cpu < NR_CPUS; cpu++) > > + __cpu_full_name[cpu] =3D loongson_sysconf.cpuname= ; > > + } > > + return 0; > > +} > > +arch_initcall(init_cpu_fullname); > > diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.= S > > new file mode 100644 > > index 000000000000..f0b3e76bb762 > > --- /dev/null > > +++ b/arch/loongarch/kernel/head.S > > @@ -0,0 +1,97 @@ > > +/* SPDX-License-Identifier: GPL-2.0 */ > > +/* > > + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited > > + */ > > +#include > > +#include > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#ifdef CONFIG_EFI_STUB > > + > > +#include "efi-header.S" > > + > > + __HEAD > > + > > +_head: > > + .word MZ_MAGIC /* "MZ", MS-DOS header */ > > + .org 0x28 > > + .ascii "Loongson\0" /* Magic number for BootLoader */ > > If you must use a magic number, "Loongson" is not recommended, because > this string lacks uniqueness in the Loongson/LoongArch world. Too many > things are called "Loongson foo" right now, and the string is so > ordinary people don't immediately think of it as "magic". > > I recommended using some other interesting text (and encoding) for the > magic number, in a different communication venue, but I think that > proposal got ignored by you without any explanation whatsoever. For now > I'll just repeat myself: > > For an interesting magic number related to Loongson/LoongArch/Loong > (like dragons but not exactly the same, let's not expand on that front) > in general, it's perhaps better to use GB18030-encoded four-character > dragon-related idioms. It's GB18030 because one Chinese character is 2 > bytes in this encoding, and being non-UTF-8 it's unlikely any user input > would accidentally resemble it. So we get 8 bytes that appear as huge > negative numbers if cast into C long, and random enough that collisions > are highly unlikely. > > For example, I chose 4 famous dragon-related phrases from the I Ching, > in both simplified and traditional characters: > > =E6=BD=9C=E9=BE=99=E5=8B=BF=E7=94=A8: 0xc7b1c1facef0d3c3 > =E8=A7=81=E9=BE=99=E5=9C=A8=E7=94=B0: 0xbcfbc1fad4daccef > =E9=A3=9E=E9=BE=99=E5=9C=A8=E5=A4=A9: 0xb7c9c1fad4daccec > =E4=BA=A2=E9=BE=99=E6=9C=89=E6=82=94: 0xbfbac1fad3d0bbda > =E6=BD=9B=E9=BE=8D=E5=8B=BF=E7=94=A8: 0x9d93fd88cef0d3c3 > =E8=A6=8B=E9=BE=8D=E5=9C=A8=E7=94=B0: 0xd28afd88d4daccef > =E9=A3=9B=E9=BE=8D=E5=9C=A8=E5=A4=A9: 0xef77fd88d4daccec > =E4=BA=A2=E9=BE=8D=E6=9C=89=E6=82=94: 0xbfbafd88d3d0bbda > > and I think each of them is better than "Loongson". ARM64_IMAGE_MAGIC is "ARM64", RISCV_IMAGE_MAGIC is "RISCV", so I think we use "Loongson" as a magic is just OK. > > > + .org 0x3c > > + .long pe_header - _head /* Offset to the PE header */ > > + > > +pe_header: > > + __EFI_PE_HEADER > > + > > +SYM_DATA(kernel_asize, .long _end - _text); > > +SYM_DATA(kernel_fsize, .long _edata - _text); > > +SYM_DATA(kernel_offset, .long kernel_offset - _text); > > + > > +kernel_version: > > + .ascii UTS_RELEASE " (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST = ") " UTS_VERSION "\0" > > + > > +#endif > > + > > + __REF > > + > > +SYM_ENTRY(_stext, SYM_L_GLOBAL, SYM_A_NONE) > > + > > +SYM_CODE_START(kernel_entry) # kernel entry point > > + > > + /* Config direct window and set PG */ > > + li.d t0, CSR_DMW0_INIT # UC, PLV0, 0x8000 xxxx x= xxx xxxx > > + csrwr t0, LOONGARCH_CSR_DMWIN0 > > + li.d t0, CSR_DMW1_INIT # CA, PLV0, 0x9000 xxxx x= xxx xxxx > > + csrwr t0, LOONGARCH_CSR_DMWIN1 > > + /* Enable PG */ > > + li.w t0, 0xb0 # PLV=3D0, IE=3D0, PG=3D1 > > + csrwr t0, LOONGARCH_CSR_CRMD > > + li.w t0, 0x04 # PLV=3D0, PIE=3D1, PWE= =3D0 > > + csrwr t0, LOONGARCH_CSR_PRMD > > + li.w t0, 0x00 # FPE=3D0, SXE=3D0, ASXE= =3D0, BTE=3D0 > > + csrwr t0, LOONGARCH_CSR_EUEN > > + > > + /* We might not get launched at the address the kernel is linked = to, > > + so we jump there. */ > > + la.abs t0, 0f > > + jirl zero, t0, 0 > > +0: > > + la t0, __bss_start # clear .bss > > + st.d zero, t0, 0 > > + la t1, __bss_stop - LONGSIZE > > +1: > > + addi.d t0, t0, LONGSIZE > > + st.d zero, t0, 0 > > + bne t0, t1, 1b > > + > > + la t0, fw_arg0 > > + st.d a0, t0, 0 # firmware arguments > > + la t0, fw_arg1 > > + st.d a1, t0, 0 > > + la t0, fw_arg2 > > + st.d a2, t0, 0 > We don't use a2 any more with this revision of boot protocol, so this > could get removed. > > + > > + /* KScratch3 used for percpu base, initialized as 0 */ > > + csrwr zero, PERCPU_BASE_KS > > KScratch3 is MIPS-ism, it's SAVE3 in LoongArch. OK, I will change all KScratch to KSave. Huacai > > Also, reading the manual it's only guaranteed that at least 1 SAVE > register is available, and we're not checking CSR.PRCFG1.SAVENum for > number of implemented SAVE registers. > > Having said that, the only LoongArch implementation does have this > register, and future models would require adaptation to work after all, > so keeping as-is is somewhat okay. > > (No further comments below.) > > > + /* GPR21 used for percpu base (runtime), initialized as 0 */ > > + or u0, zero, zero > > + > > + la tp, init_thread_union > > + /* Set the SP after an empty pt_regs. */ > > + PTR_LI sp, (_THREAD_SIZE - 32 - PT_SIZE) > > + PTR_ADD sp, sp, tp > > + set_saved_sp sp, t0, t1 > > + PTR_ADDI sp, sp, -4 * SZREG # init stack pointer > > + > > + bl start_kernel > > + > > +SYM_CODE_END(kernel_entry) > > + > > +SYM_ENTRY(kernel_entry_end, SYM_L_GLOBAL, SYM_A_NONE) > (rest of patch snipped)