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[2001:1868:205::9]) by mx.google.com with ESMTPS id xq4si17972668pab.229.2015.11.23.01.16.00 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 23 Nov 2015 01:16:01 -0800 (PST) Received-SPF: pass (google.com: domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) client-ip=2001:1868:205::9; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 2001:1868:205::9 as permitted sender) smtp.mailfrom=linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org; dkim=neutral (body hash did not verify) header.i=@linaro-org.20150623.gappssmtp.com Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1a0nCd-0002O4-VL; Mon, 23 Nov 2015 09:14:27 +0000 Received: from mail-wm0-x22b.google.com ([2a00:1450:400c:c09::22b]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1a0n5o-0003HZ-Gi for linux-arm-kernel@lists.infradead.org; Mon, 23 Nov 2015 09:07:31 +0000 Received: by wmuu63 with SMTP id u63so44707691wmu.0 for ; Mon, 23 Nov 2015 01:07:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro-org.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=CPVLJePFSXNxNrSOiLTfb5m/GxFIZwz2xuCM2SC2a28=; b=rRO8WdxLcNHQozlgTmsjpL+l99kiQBFVpHKgf5q/tz3g0X5g80AOkpG9I7KfkJGbue BuP/u5m/EGVPv+i6RSOGJUDPWd1Xzo0+mS/l0TKEzepZqq/IKVfPaXoWjrOUVPQNk6DL r+uAJ06owfDsKHsrO+kZK2+8jhiIcdXZEKOdXKHq73PU/D6V0sA5xgb/G7mlNnEBOKWz bjggr8tGXoUQpbBhHjTerfVd2jElOqz2dMyAs9s9eyfTP2+PwSdWQCTDW+0RNVnQ0rfC mhQal54aZAOLROHftHOBhlydI7cEWt3hznyn8+OkXHArGICI4xl95GqGciy0Y/nH1sJk 5fUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=CPVLJePFSXNxNrSOiLTfb5m/GxFIZwz2xuCM2SC2a28=; b=Osma9RD0SKkvWoC0EX/uqd95d1EUH/xd6XJRCZL4b3pFROJA8miFqkm2QlvCRzlgVh tCVrz6tGlBbm6N0ifvdAc9BK3LUjSvAOp7gRBpicv05KuaMOjwsEqYhJOkqZMsTqkJLb 2eASqonoRTPnhU69//kYcDPU9NnLsmW0DgAFprxl/hzFFhGGut93dqAUl1v3vCOYdUuh IQWfHWj3Ip4kXwuagIXPmgVva2UZGXUP2UeSBDMstSU7LwPFEuTzvAVL6asnea4ltQ6g p4MHx3g9SZVbAzxS0rWh6E855GWFmdd93NUtrbl/07dog+enRdkVDDxbWC/3hSdbQN27 Stzw== X-Gm-Message-State: ALoCoQn5XfgjrU+3sbtK6fA7Fvn3VJkDUEtmlqFWbZ1fU3RSr0NX9bnc+YZmUeOTZUP1FC6BlZRe X-Received: by 10.194.24.231 with SMTP id x7mr33349474wjf.103.1448269622951; Mon, 23 Nov 2015 01:07:02 -0800 (PST) Received: from localhost.localdomain ([2.44.140.166]) by smtp.gmail.com with ESMTPSA id h189sm12241754wme.1.2015.11.23.01.06.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 23 Nov 2015 01:07:02 -0800 (PST) From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, will.deacon@arm.com, mark.rutland@arm.com, linux-efi@vger.kernel.org, leif.lindholm@linaro.org, matt@codeblueprint.co.uk Subject: [PATCH v3 04/13] arm64/efi: split off EFI init and runtime code for reuse by 32-bit ARM Date: Mon, 23 Nov 2015 10:06:24 +0100 Message-Id: <1448269593-20758-5-git-send-email-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1448269593-20758-1-git-send-email-ard.biesheuvel@linaro.org> References: <1448269593-20758-1-git-send-email-ard.biesheuvel@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151123_010725_227567_B9C533BA X-CRM114-Status: GOOD ( 27.50 ) X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.4.0 on bombadil.infradead.org summary: Content analysis details: (-2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [2a00:1450:400c:c09:0:0:0:22b listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kuleshovmail@gmail.com, Ard Biesheuvel , roy.franz@linaro.org, linux-mm@kvack.org, ryan.harkin@linaro.org, msalter@redhat.com, grant.likely@linaro.org, akpm@linux-foundation.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org This splits off the early EFI init and runtime code that - discovers the EFI params and the memory map from the FDT, and installs the memblocks and config tables. - prepares and installs the EFI page tables so that UEFI Runtime Services can be invoked at the virtual address installed by the stub. This will allow it to be reused for 32-bit ARM. Signed-off-by: Ard Biesheuvel --- arch/arm64/kernel/efi.c | 331 +------------------- drivers/firmware/efi/Makefile | 3 + drivers/firmware/efi/arm-init.c | 208 ++++++++++++ drivers/firmware/efi/arm-runtime.c | 156 +++++++++ 4 files changed, 368 insertions(+), 330 deletions(-) -- 1.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c index d746d15c882f..bd3b2f5adf0c 100644 --- a/arch/arm64/kernel/efi.c +++ b/arch/arm64/kernel/efi.c @@ -11,323 +11,11 @@ * */ -#include #include #include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include +#include -#include #include -#include -#include -#include -#include - -struct efi_memory_map memmap; - -static u64 efi_system_table; - -static pgd_t efi_pgd[PTRS_PER_PGD] __page_aligned_bss; - -static struct mm_struct efi_mm = { - .mm_rb = RB_ROOT, - .pgd = efi_pgd, - .mm_users = ATOMIC_INIT(2), - .mm_count = ATOMIC_INIT(1), - .mmap_sem = __RWSEM_INITIALIZER(efi_mm.mmap_sem), - .page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock), - .mmlist = LIST_HEAD_INIT(efi_mm.mmlist), -}; - -static int __init is_normal_ram(efi_memory_desc_t *md) -{ - if (md->attribute & EFI_MEMORY_WB) - return 1; - return 0; -} - -/* - * Translate a EFI virtual address into a physical address: this is necessary, - * as some data members of the EFI system table are virtually remapped after - * SetVirtualAddressMap() has been called. - */ -static phys_addr_t efi_to_phys(unsigned long addr) -{ - efi_memory_desc_t *md; - - for_each_efi_memory_desc(&memmap, md) { - if (!(md->attribute & EFI_MEMORY_RUNTIME)) - continue; - if (md->virt_addr == 0) - /* no virtual mapping has been installed by the stub */ - break; - if (md->virt_addr <= addr && - (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT)) - return md->phys_addr + addr - md->virt_addr; - } - return addr; -} - -static int __init uefi_init(void) -{ - efi_char16_t *c16; - void *config_tables; - u64 table_size; - char vendor[100] = "unknown"; - int i, retval; - - efi.systab = early_memremap(efi_system_table, - sizeof(efi_system_table_t)); - if (efi.systab == NULL) { - pr_warn("Unable to map EFI system table.\n"); - return -ENOMEM; - } - - set_bit(EFI_BOOT, &efi.flags); - set_bit(EFI_64BIT, &efi.flags); - - /* - * Verify the EFI Table - */ - if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { - pr_err("System table signature incorrect\n"); - retval = -EINVAL; - goto out; - } - if ((efi.systab->hdr.revision >> 16) < 2) - pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n", - efi.systab->hdr.revision >> 16, - efi.systab->hdr.revision & 0xffff); - - /* Show what we know for posterity */ - c16 = early_memremap(efi_to_phys(efi.systab->fw_vendor), - sizeof(vendor) * sizeof(efi_char16_t)); - if (c16) { - for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i) - vendor[i] = c16[i]; - vendor[i] = '\0'; - early_memunmap(c16, sizeof(vendor) * sizeof(efi_char16_t)); - } - - pr_info("EFI v%u.%.02u by %s\n", - efi.systab->hdr.revision >> 16, - efi.systab->hdr.revision & 0xffff, vendor); - - table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables; - config_tables = early_memremap(efi_to_phys(efi.systab->tables), - table_size); - if (config_tables == NULL) { - pr_warn("Unable to map EFI config table array.\n"); - retval = -ENOMEM; - goto out; - } - retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables, - sizeof(efi_config_table_64_t), NULL); - - early_memunmap(config_tables, table_size); -out: - early_memunmap(efi.systab, sizeof(efi_system_table_t)); - return retval; -} - -/* - * Return true for RAM regions we want to permanently reserve. - */ -static __init int is_reserve_region(efi_memory_desc_t *md) -{ - switch (md->type) { - case EFI_LOADER_CODE: - case EFI_LOADER_DATA: - case EFI_BOOT_SERVICES_CODE: - case EFI_BOOT_SERVICES_DATA: - case EFI_CONVENTIONAL_MEMORY: - case EFI_PERSISTENT_MEMORY: - return 0; - default: - break; - } - return is_normal_ram(md); -} - -static __init void reserve_regions(void) -{ - efi_memory_desc_t *md; - u64 paddr, npages, size; - - if (efi_enabled(EFI_DBG)) - pr_info("Processing EFI memory map:\n"); - - for_each_efi_memory_desc(&memmap, md) { - paddr = md->phys_addr; - npages = md->num_pages; - - if (efi_enabled(EFI_DBG)) { - char buf[64]; - - pr_info(" 0x%012llx-0x%012llx %s", - paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1, - efi_md_typeattr_format(buf, sizeof(buf), md)); - } - - memrange_efi_to_native(&paddr, &npages); - size = npages << PAGE_SHIFT; - - if (is_normal_ram(md)) - early_init_dt_add_memory_arch(paddr, size); - - if (is_reserve_region(md)) { - memblock_mark_nomap(paddr, size); - if (efi_enabled(EFI_DBG)) - pr_cont("*"); - } - - if (efi_enabled(EFI_DBG)) - pr_cont("\n"); - } - - set_bit(EFI_MEMMAP, &efi.flags); -} - -void __init efi_init(void) -{ - struct efi_fdt_params params; - - /* Grab UEFI information placed in FDT by stub */ - if (!efi_get_fdt_params(¶ms)) - return; - - efi_system_table = params.system_table; - - memmap.phys_map = params.mmap; - memmap.map = early_memremap(params.mmap, params.mmap_size); - if (memmap.map == NULL) { - /* - * If we are booting via UEFI, the UEFI memory map is the only - * description of memory we have, so there is little point in - * proceeding if we cannot access it. - */ - panic("Unable to map EFI memory map.\n"); - } - memmap.map_end = memmap.map + params.mmap_size; - memmap.desc_size = params.desc_size; - memmap.desc_version = params.desc_ver; - - if (uefi_init() < 0) - return; - - reserve_regions(); - early_memunmap(memmap.map, params.mmap_size); - memblock_mark_nomap(params.mmap & PAGE_MASK, - PAGE_ALIGN(params.mmap_size + - (params.mmap & ~PAGE_MASK))); -} - -static bool __init efi_virtmap_init(void) -{ - efi_memory_desc_t *md; - - init_new_context(NULL, &efi_mm); - - for_each_efi_memory_desc(&memmap, md) { - u64 paddr, npages, size; - pgprot_t prot; - - if (!(md->attribute & EFI_MEMORY_RUNTIME)) - continue; - if (md->virt_addr == 0) - return false; - - paddr = md->phys_addr; - npages = md->num_pages; - memrange_efi_to_native(&paddr, &npages); - size = npages << PAGE_SHIFT; - - pr_info(" EFI remap 0x%016llx => %p\n", - md->phys_addr, (void *)md->virt_addr); - - /* - * Only regions of type EFI_RUNTIME_SERVICES_CODE need to be - * executable, everything else can be mapped with the XN bits - * set. - */ - if (!is_normal_ram(md)) - prot = __pgprot(PROT_DEVICE_nGnRE); - else if (md->type == EFI_RUNTIME_SERVICES_CODE || - !PAGE_ALIGNED(md->phys_addr)) - prot = PAGE_KERNEL_EXEC; - else - prot = PAGE_KERNEL; - - create_pgd_mapping(&efi_mm, paddr, md->virt_addr, size, - __pgprot(pgprot_val(prot) | PTE_NG)); - } - return true; -} - -/* - * Enable the UEFI Runtime Services if all prerequisites are in place, i.e., - * non-early mapping of the UEFI system table and virtual mappings for all - * EFI_MEMORY_RUNTIME regions. - */ -static int __init arm64_enable_runtime_services(void) -{ - u64 mapsize; - - if (!efi_enabled(EFI_BOOT)) { - pr_info("EFI services will not be available.\n"); - return 0; - } - - if (efi_runtime_disabled()) { - pr_info("EFI runtime services will be disabled.\n"); - return 0; - } - - pr_info("Remapping and enabling EFI services.\n"); - - mapsize = memmap.map_end - memmap.map; - memmap.map = (__force void *)ioremap_cache(memmap.phys_map, - mapsize); - if (!memmap.map) { - pr_err("Failed to remap EFI memory map\n"); - return -ENOMEM; - } - memmap.map_end = memmap.map + mapsize; - efi.memmap = &memmap; - - efi.systab = (__force void *)ioremap_cache(efi_system_table, - sizeof(efi_system_table_t)); - if (!efi.systab) { - pr_err("Failed to remap EFI System Table\n"); - return -ENOMEM; - } - set_bit(EFI_SYSTEM_TABLES, &efi.flags); - - if (!efi_virtmap_init()) { - pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n"); - return -ENOMEM; - } - - /* Set up runtime services function pointers */ - efi_native_runtime_setup(); - set_bit(EFI_RUNTIME_SERVICES, &efi.flags); - - efi.runtime_version = efi.systab->hdr.revision; - - return 0; -} -early_initcall(arm64_enable_runtime_services); static int __init arm64_dmi_init(void) { @@ -343,23 +31,6 @@ static int __init arm64_dmi_init(void) } core_initcall(arm64_dmi_init); -static void efi_set_pgd(struct mm_struct *mm) -{ - switch_mm(NULL, mm, NULL); -} - -void efi_virtmap_load(void) -{ - preempt_disable(); - efi_set_pgd(&efi_mm); -} - -void efi_virtmap_unload(void) -{ - efi_set_pgd(current->active_mm); - preempt_enable(); -} - /* * UpdateCapsule() depends on the system being shutdown via * ResetSystem(). diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile index ec379a4164cc..f292917b00e7 100644 --- a/drivers/firmware/efi/Makefile +++ b/drivers/firmware/efi/Makefile @@ -18,3 +18,6 @@ obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o obj-$(CONFIG_EFI_STUB) += libstub/ obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_mem.o + +arm-obj-$(CONFIG_EFI) := arm-init.o arm-runtime.o +obj-$(CONFIG_ARM64) += $(arm-obj-y) diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c new file mode 100644 index 000000000000..ffdd76a51929 --- /dev/null +++ b/drivers/firmware/efi/arm-init.c @@ -0,0 +1,208 @@ +/* + * Extensible Firmware Interface + * + * Based on Extensible Firmware Interface Specification version 2.4 + * + * Copyright (C) 2013 - 2015 Linaro Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include +#include +#include +#include +#include +#include + +#include + +struct efi_memory_map memmap; + +u64 efi_system_table; + +static int __init is_normal_ram(efi_memory_desc_t *md) +{ + if (md->attribute & EFI_MEMORY_WB) + return 1; + return 0; +} + +/* + * Translate a EFI virtual address into a physical address: this is necessary, + * as some data members of the EFI system table are virtually remapped after + * SetVirtualAddressMap() has been called. + */ +static phys_addr_t efi_to_phys(unsigned long addr) +{ + efi_memory_desc_t *md; + + for_each_efi_memory_desc(&memmap, md) { + if (!(md->attribute & EFI_MEMORY_RUNTIME)) + continue; + if (md->virt_addr == 0) + /* no virtual mapping has been installed by the stub */ + break; + if (md->virt_addr <= addr && + (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT)) + return md->phys_addr + addr - md->virt_addr; + } + return addr; +} + +static int __init uefi_init(void) +{ + efi_char16_t *c16; + void *config_tables; + u64 table_size; + char vendor[100] = "unknown"; + int i, retval; + + efi.systab = early_memremap(efi_system_table, + sizeof(efi_system_table_t)); + if (efi.systab == NULL) { + pr_warn("Unable to map EFI system table.\n"); + return -ENOMEM; + } + + set_bit(EFI_BOOT, &efi.flags); + set_bit(EFI_64BIT, &efi.flags); + + /* + * Verify the EFI Table + */ + if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { + pr_err("System table signature incorrect\n"); + retval = -EINVAL; + goto out; + } + if ((efi.systab->hdr.revision >> 16) < 2) + pr_warn("Warning: EFI system table version %d.%02d, expected 2.00 or greater\n", + efi.systab->hdr.revision >> 16, + efi.systab->hdr.revision & 0xffff); + + /* Show what we know for posterity */ + c16 = early_memremap(efi_to_phys(efi.systab->fw_vendor), + sizeof(vendor) * sizeof(efi_char16_t)); + if (c16) { + for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i) + vendor[i] = c16[i]; + vendor[i] = '\0'; + early_memunmap(c16, sizeof(vendor) * sizeof(efi_char16_t)); + } + + pr_info("EFI v%u.%.02u by %s\n", + efi.systab->hdr.revision >> 16, + efi.systab->hdr.revision & 0xffff, vendor); + + table_size = sizeof(efi_config_table_64_t) * efi.systab->nr_tables; + config_tables = early_memremap(efi_to_phys(efi.systab->tables), + table_size); + if (config_tables == NULL) { + pr_warn("Unable to map EFI config table array.\n"); + retval = -ENOMEM; + goto out; + } + retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables, + sizeof(efi_config_table_64_t), NULL); + + early_memunmap(config_tables, table_size); +out: + early_memunmap(efi.systab, sizeof(efi_system_table_t)); + return retval; +} + +/* + * Return true for RAM regions we want to permanently reserve. + */ +static __init int is_reserve_region(efi_memory_desc_t *md) +{ + switch (md->type) { + case EFI_LOADER_CODE: + case EFI_LOADER_DATA: + case EFI_BOOT_SERVICES_CODE: + case EFI_BOOT_SERVICES_DATA: + case EFI_CONVENTIONAL_MEMORY: + case EFI_PERSISTENT_MEMORY: + return 0; + default: + break; + } + return is_normal_ram(md); +} + +static __init void reserve_regions(void) +{ + efi_memory_desc_t *md; + u64 paddr, npages, size; + + if (efi_enabled(EFI_DBG)) + pr_info("Processing EFI memory map:\n"); + + for_each_efi_memory_desc(&memmap, md) { + paddr = md->phys_addr; + npages = md->num_pages; + + if (efi_enabled(EFI_DBG)) { + char buf[64]; + + pr_info(" 0x%012llx-0x%012llx %s", + paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1, + efi_md_typeattr_format(buf, sizeof(buf), md)); + } + + memrange_efi_to_native(&paddr, &npages); + size = npages << PAGE_SHIFT; + + if (is_normal_ram(md)) + early_init_dt_add_memory_arch(paddr, size); + + if (is_reserve_region(md)) { + memblock_mark_nomap(paddr, size); + if (efi_enabled(EFI_DBG)) + pr_cont("*"); + } + + if (efi_enabled(EFI_DBG)) + pr_cont("\n"); + } + + set_bit(EFI_MEMMAP, &efi.flags); +} + +void __init efi_init(void) +{ + struct efi_fdt_params params; + + /* Grab UEFI information placed in FDT by stub */ + if (!efi_get_fdt_params(¶ms)) + return; + + efi_system_table = params.system_table; + + memmap.phys_map = params.mmap; + memmap.map = early_memremap(params.mmap, params.mmap_size); + if (memmap.map == NULL) { + /* + * If we are booting via UEFI, the UEFI memory map is the only + * description of memory we have, so there is little point in + * proceeding if we cannot access it. + */ + panic("Unable to map EFI memory map.\n"); + } + memmap.map_end = memmap.map + params.mmap_size; + memmap.desc_size = params.desc_size; + memmap.desc_version = params.desc_ver; + + if (uefi_init() < 0) + return; + + reserve_regions(); + early_memunmap(memmap.map, params.mmap_size); + memblock_mark_nomap(params.mmap & PAGE_MASK, + PAGE_ALIGN(params.mmap_size + + (params.mmap & ~PAGE_MASK))); +} diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c new file mode 100644 index 000000000000..22b11752185e --- /dev/null +++ b/drivers/firmware/efi/arm-runtime.c @@ -0,0 +1,156 @@ +/* + * Extensible Firmware Interface + * + * Based on Extensible Firmware Interface Specification version 2.4 + * + * Copyright (C) 2013, 2014 Linaro Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +static pgd_t efi_pgd[PTRS_PER_PGD] __page_aligned_bss; + +extern u64 efi_system_table; + +static struct mm_struct efi_mm = { + .mm_rb = RB_ROOT, + .pgd = efi_pgd, + .mm_users = ATOMIC_INIT(2), + .mm_count = ATOMIC_INIT(1), + .mmap_sem = __RWSEM_INITIALIZER(efi_mm.mmap_sem), + .page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock), + .mmlist = LIST_HEAD_INIT(efi_mm.mmlist), +}; + +static bool __init efi_virtmap_init(void) +{ + efi_memory_desc_t *md; + + init_new_context(NULL, &efi_mm); + + for_each_efi_memory_desc(&memmap, md) { + u64 paddr, npages, size; + pgprot_t prot; + + if (!(md->attribute & EFI_MEMORY_RUNTIME)) + continue; + if (md->virt_addr == 0) + return false; + + paddr = md->phys_addr; + npages = md->num_pages; + memrange_efi_to_native(&paddr, &npages); + size = npages << PAGE_SHIFT; + + pr_info(" EFI remap 0x%016llx => %p\n", + md->phys_addr, (void *)md->virt_addr); + + /* + * Only regions of type EFI_RUNTIME_SERVICES_CODE need to be + * executable, everything else can be mapped with the XN bits + * set. + */ + if ((md->attribute & EFI_MEMORY_WB) == 0) + prot = __pgprot(PROT_DEVICE_nGnRE); + else if (md->type == EFI_RUNTIME_SERVICES_CODE || + !PAGE_ALIGNED(md->phys_addr)) + prot = PAGE_KERNEL_EXEC; + else + prot = PAGE_KERNEL; + + create_pgd_mapping(&efi_mm, paddr, md->virt_addr, size, + __pgprot(pgprot_val(prot) | PTE_NG)); + } + return true; +} + +/* + * Enable the UEFI Runtime Services if all prerequisites are in place, i.e., + * non-early mapping of the UEFI system table and virtual mappings for all + * EFI_MEMORY_RUNTIME regions. + */ +static int __init arm64_enable_runtime_services(void) +{ + u64 mapsize; + + if (!efi_enabled(EFI_BOOT)) { + pr_info("EFI services will not be available.\n"); + return -1; + } + + if (efi_runtime_disabled()) { + pr_info("EFI runtime services will be disabled.\n"); + return -1; + } + + pr_info("Remapping and enabling EFI services.\n"); + + mapsize = memmap.map_end - memmap.map; + memmap.map = (__force void *)ioremap_cache(memmap.phys_map, + mapsize); + if (!memmap.map) { + pr_err("Failed to remap EFI memory map\n"); + return -1; + } + memmap.map_end = memmap.map + mapsize; + efi.memmap = &memmap; + + efi.systab = (__force void *)ioremap_cache(efi_system_table, + sizeof(efi_system_table_t)); + if (!efi.systab) { + pr_err("Failed to remap EFI System Table\n"); + return -1; + } + set_bit(EFI_SYSTEM_TABLES, &efi.flags); + + if (!efi_virtmap_init()) { + pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n"); + return -1; + } + + /* Set up runtime services function pointers */ + efi_native_runtime_setup(); + set_bit(EFI_RUNTIME_SERVICES, &efi.flags); + + efi.runtime_version = efi.systab->hdr.revision; + + return 0; +} +early_initcall(arm64_enable_runtime_services); + +static void efi_set_pgd(struct mm_struct *mm) +{ + switch_mm(NULL, mm, NULL); +} + +void efi_virtmap_load(void) +{ + preempt_disable(); + efi_set_pgd(&efi_mm); +} + +void efi_virtmap_unload(void) +{ + efi_set_pgd(current->active_mm); + preempt_enable(); +}