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32 results

bpf.h

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  • arm-init.c 6.71 KiB
    /*
     * 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.
     *
     */
    
    #define pr_fmt(fmt)	"efi: " fmt
    
    #include <linux/efi.h>
    #include <linux/init.h>
    #include <linux/memblock.h>
    #include <linux/mm_types.h>
    #include <linux/of.h>
    #include <linux/of_fdt.h>
    #include <linux/platform_device.h>
    #include <linux/screen_info.h>
    
    #include <asm/efi.h>
    
    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(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 __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR;
    
    static __initdata efi_config_table_type_t arch_tables[] = {
    	{LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, NULL, &screen_info_table},
    	{NULL_GUID, NULL, NULL}
    };
    
    static void __init init_screen_info(void)
    {
    	struct screen_info *si;
    
    	if (screen_info_table != EFI_INVALID_TABLE_ADDR) {
    		si = early_memremap_ro(screen_info_table, sizeof(*si));
    		if (!si) {
    			pr_err("Could not map screen_info config table\n");
    			return;
    		}
    		screen_info = *si;
    		early_memunmap(si, sizeof(*si));
    
    		/* dummycon on ARM needs non-zero values for columns/lines */
    		screen_info.orig_video_cols = 80;
    		screen_info.orig_video_lines = 25;
    	}
    
    	if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
    	    memblock_is_map_memory(screen_info.lfb_base))
    		memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
    }
    
    static int __init uefi_init(void)
    {
    	efi_char16_t *c16;
    	void *config_tables;
    	size_t table_size;
    	char vendor[100] = "unknown";
    	int i, retval;
    
    	efi.systab = early_memremap_ro(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);
    	if (IS_ENABLED(CONFIG_64BIT))
    		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);
    
    	efi.runtime_version = efi.systab->hdr.revision;
    
    	/* Show what we know for posterity */
    	c16 = early_memremap_ro(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_ro(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_t),
    					 arch_tables);
    
    	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;
    	int resv;
    
    	if (efi_enabled(EFI_DBG))
    		pr_info("Processing EFI memory map:\n");
    
    	/*
    	 * Discard memblocks discovered so far: if there are any at this
    	 * point, they originate from memory nodes in the DT, and UEFI
    	 * uses its own memory map instead.
    	 */
    	memblock_dump_all();
    	memblock_remove(0, (phys_addr_t)ULLONG_MAX);
    
    	for_each_efi_memory_desc(md) {
    		paddr = md->phys_addr;
    		npages = md->num_pages;
    
    		resv = is_reserve_region(md);
    		if (efi_enabled(EFI_DBG)) {
    			char buf[64];
    
    			pr_info("  0x%012llx-0x%012llx %s%s\n",
    				paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
    				efi_md_typeattr_format(buf, sizeof(buf), md),
    				resv ? "*" : "");
    		}
    
    		memrange_efi_to_native(&paddr, &npages);
    		size = npages << PAGE_SHIFT;
    
    		if (is_normal_ram(md))
    			early_init_dt_add_memory_arch(paddr, size);
    
    		if (resv)
    			memblock_mark_nomap(paddr, size);
    
    	}
    
    	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(&params))
    		return;
    
    	efi_system_table = params.system_table;
    
    	efi.memmap.phys_map = params.mmap;
    	efi.memmap.map = early_memremap_ro(params.mmap, params.mmap_size);
    	if (efi.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");
    	}
    	efi.memmap.map_end = efi.memmap.map + params.mmap_size;
    	efi.memmap.desc_size = params.desc_size;
    	efi.memmap.desc_version = params.desc_ver;
    
    	WARN(efi.memmap.desc_version != 1,
    	     "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
    	      efi.memmap.desc_version);
    
    	if (uefi_init() < 0)
    		return;
    
    	reserve_regions();
    	efi_memattr_init();
    	early_memunmap(efi.memmap.map, params.mmap_size);
    
    	memblock_reserve(params.mmap & PAGE_MASK,
    			 PAGE_ALIGN(params.mmap_size +
    				    (params.mmap & ~PAGE_MASK)));
    
    	init_screen_info();
    }
    
    static int __init register_gop_device(void)
    {
    	void *pd;
    
    	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
    		return 0;
    
    	pd = platform_device_register_data(NULL, "efi-framebuffer", 0,
    					   &screen_info, sizeof(screen_info));
    	return PTR_ERR_OR_ZERO(pd);
    }
    subsys_initcall(register_gop_device);