1 files changed, 0 insertions, 391 deletions

diff --git a/drivers/firmware/efi/libstub/arm-stub.c b/drivers/firmware/efi/libstub/arm-stub.c
deleted file mode 100644
index 8181ac179d14..000000000000
--- a/drivers/firmware/efi/libstub/arm-stub.c
+++ /dev/null
@@ -1,391 +0,0 @@
-/*
- * EFI stub implementation that is shared by arm and arm64 architectures.
- * This should be #included by the EFI stub implementation files.
- *
- * Copyright (C) 2013,2014 Linaro Limited
- *     Roy Franz <roy.franz@linaro.org
- * Copyright (C) 2013 Red Hat, Inc.
- *     Mark Salter <msalter@redhat.com>
- *
- * This file is part of the Linux kernel, and is made available under the
- * terms of the GNU General Public License version 2.
- *
- */
-
-#include <linux/efi.h>
-#include <linux/sort.h>
-#include <asm/efi.h>
-
-#include "efistub.h"
-
-/*
- * This is the base address at which to start allocating virtual memory ranges
- * for UEFI Runtime Services. This is in the low TTBR0 range so that we can use
- * any allocation we choose, and eliminate the risk of a conflict after kexec.
- * The value chosen is the largest non-zero power of 2 suitable for this purpose
- * both on 32-bit and 64-bit ARM CPUs, to maximize the likelihood that it can
- * be mapped efficiently.
- * Since 32-bit ARM could potentially execute with a 1G/3G user/kernel split,
- * map everything below 1 GB. (512 MB is a reasonable upper bound for the
- * entire footprint of the UEFI runtime services memory regions)
- */
-#define EFI_RT_VIRTUAL_BASE	SZ_512M
-#define EFI_RT_VIRTUAL_SIZE	SZ_512M
-
-#ifdef CONFIG_ARM64
-# define EFI_RT_VIRTUAL_LIMIT	TASK_SIZE_64
-#else
-# define EFI_RT_VIRTUAL_LIMIT	TASK_SIZE
-#endif
-
-static u64 virtmap_base = EFI_RT_VIRTUAL_BASE;
-
-efi_status_t efi_open_volume(efi_system_table_t *sys_table_arg,
-			     void *__image, void **__fh)
-{
-	efi_file_io_interface_t *io;
-	efi_loaded_image_t *image = __image;
-	efi_file_handle_t *fh;
-	efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
-	efi_status_t status;
-	void *handle = (void *)(unsigned long)image->device_handle;
-
-	status = sys_table_arg->boottime->handle_protocol(handle,
-				 &fs_proto, (void **)&io);
-	if (status != EFI_SUCCESS) {
-		efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
-		return status;
-	}
-
-	status = io->open_volume(io, &fh);
-	if (status != EFI_SUCCESS)
-		efi_printk(sys_table_arg, "Failed to open volume\n");
-
-	*__fh = fh;
-	return status;
-}
-
-void efi_char16_printk(efi_system_table_t *sys_table_arg,
-			      efi_char16_t *str)
-{
-	struct efi_simple_text_output_protocol *out;
-
-	out = (struct efi_simple_text_output_protocol *)sys_table_arg->con_out;
-	out->output_string(out, str);
-}
-
-static struct screen_info *setup_graphics(efi_system_table_t *sys_table_arg)
-{
-	efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
-	efi_status_t status;
-	unsigned long size;
-	void **gop_handle = NULL;
-	struct screen_info *si = NULL;
-
-	size = 0;
-	status = efi_call_early(locate_handle, EFI_LOCATE_BY_PROTOCOL,
-				&gop_proto, NULL, &size, gop_handle);
-	if (status == EFI_BUFFER_TOO_SMALL) {
-		si = alloc_screen_info(sys_table_arg);
-		if (!si)
-			return NULL;
-		efi_setup_gop(sys_table_arg, si, &gop_proto, size);
-	}
-	return si;
-}
-
-/*
- * This function handles the architcture specific differences between arm and
- * arm64 regarding where the kernel image must be loaded and any memory that
- * must be reserved. On failure it is required to free all
- * all allocations it has made.
- */
-efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
-				 unsigned long *image_addr,
-				 unsigned long *image_size,
-				 unsigned long *reserve_addr,
-				 unsigned long *reserve_size,
-				 unsigned long dram_base,
-				 efi_loaded_image_t *image);
-/*
- * EFI entry point for the arm/arm64 EFI stubs.  This is the entrypoint
- * that is described in the PE/COFF header.  Most of the code is the same
- * for both archictectures, with the arch-specific code provided in the
- * handle_kernel_image() function.
- */
-unsigned long efi_entry(void *handle, efi_system_table_t *sys_table,
-			       unsigned long *image_addr)
-{
-	efi_loaded_image_t *image;
-	efi_status_t status;
-	unsigned long image_size = 0;
-	unsigned long dram_base;
-	/* addr/point and size pairs for memory management*/
-	unsigned long initrd_addr;
-	u64 initrd_size = 0;
-	unsigned long fdt_addr = 0;  /* Original DTB */
-	unsigned long fdt_size = 0;
-	char *cmdline_ptr = NULL;
-	int cmdline_size = 0;
-	unsigned long new_fdt_addr;
-	efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
-	unsigned long reserve_addr = 0;
-	unsigned long reserve_size = 0;
-	enum efi_secureboot_mode secure_boot;
-	struct screen_info *si;
-
-	/* Check if we were booted by the EFI firmware */
-	if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
-		goto fail;
-
-	status = check_platform_features(sys_table);
-	if (status != EFI_SUCCESS)
-		goto fail;
-
-	/*
-	 * Get a handle to the loaded image protocol.  This is used to get
-	 * information about the running image, such as size and the command
-	 * line.
-	 */
-	status = sys_table->boottime->handle_protocol(handle,
-					&loaded_image_proto, (void *)&image);
-	if (status != EFI_SUCCESS) {
-		pr_efi_err(sys_table, "Failed to get loaded image protocol\n");
-		goto fail;
-	}
-
-	dram_base = get_dram_base(sys_table);
-	if (dram_base == EFI_ERROR) {
-		pr_efi_err(sys_table, "Failed to find DRAM base\n");
-		goto fail;
-	}
-
-	/*
-	 * Get the command line from EFI, using the LOADED_IMAGE
-	 * protocol. We are going to copy the command line into the
-	 * device tree, so this can be allocated anywhere.
-	 */
-	cmdline_ptr = efi_convert_cmdline(sys_table, image, &cmdline_size);
-	if (!cmdline_ptr) {
-		pr_efi_err(sys_table, "getting command line via LOADED_IMAGE_PROTOCOL\n");
-		goto fail;
-	}
-
-	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
-	    IS_ENABLED(CONFIG_CMDLINE_FORCE) ||
-	    cmdline_size == 0)
-		efi_parse_options(CONFIG_CMDLINE);
-
-	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0)
-		efi_parse_options(cmdline_ptr);
-
-	pr_efi(sys_table, "Booting Linux Kernel...\n");
-
-	si = setup_graphics(sys_table);
-
-	status = handle_kernel_image(sys_table, image_addr, &image_size,
-				     &reserve_addr,
-				     &reserve_size,
-				     dram_base, image);
-	if (status != EFI_SUCCESS) {
-		pr_efi_err(sys_table, "Failed to relocate kernel\n");
-		goto fail_free_cmdline;
-	}
-
-	secure_boot = efi_get_secureboot(sys_table);
-
-	/*
-	 * Unauthenticated device tree data is a security hazard, so ignore
-	 * 'dtb=' unless UEFI Secure Boot is disabled.  We assume that secure
-	 * boot is enabled if we can't determine its state.
-	 */
-	if (secure_boot != efi_secureboot_mode_disabled &&
-	    strstr(cmdline_ptr, "dtb=")) {
-		pr_efi(sys_table, "Ignoring DTB from command line.\n");
-	} else {
-		status = handle_cmdline_files(sys_table, image, cmdline_ptr,
-					      "dtb=",
-					      ~0UL, &fdt_addr, &fdt_size);
-
-		if (status != EFI_SUCCESS) {
-			pr_efi_err(sys_table, "Failed to load device tree!\n");
-			goto fail_free_image;
-		}
-	}
-
-	if (fdt_addr) {
-		pr_efi(sys_table, "Using DTB from command line\n");
-	} else {
-		/* Look for a device tree configuration table entry. */
-		fdt_addr = (uintptr_t)get_fdt(sys_table, &fdt_size);
-		if (fdt_addr)
-			pr_efi(sys_table, "Using DTB from configuration table\n");
-	}
-
-	if (!fdt_addr)
-		pr_efi(sys_table, "Generating empty DTB\n");
-
-	status = handle_cmdline_files(sys_table, image, cmdline_ptr, "initrd=",
-				      efi_get_max_initrd_addr(dram_base,
-							      *image_addr),
-				      (unsigned long *)&initrd_addr,
-				      (unsigned long *)&initrd_size);
-	if (status != EFI_SUCCESS)
-		pr_efi_err(sys_table, "Failed initrd from command line!\n");
-
-	efi_random_get_seed(sys_table);
-
-	if (!nokaslr()) {
-		/*
-		 * Randomize the base of the UEFI runtime services region.
-		 * Preserve the 2 MB alignment of the region by taking a
-		 * shift of 21 bit positions into account when scaling
-		 * the headroom value using a 32-bit random value.
-		 */
-		static const u64 headroom = EFI_RT_VIRTUAL_LIMIT -
-					    EFI_RT_VIRTUAL_BASE -
-					    EFI_RT_VIRTUAL_SIZE;
-		u32 rnd;
-
-		status = efi_get_random_bytes(sys_table, sizeof(rnd),
-					      (u8 *)&rnd);
-		if (status == EFI_SUCCESS) {
-			virtmap_base = EFI_RT_VIRTUAL_BASE +
-				       (((headroom >> 21) * rnd) >> (32 - 21));
-		}
-	}
-
-	new_fdt_addr = fdt_addr;
-	status = allocate_new_fdt_and_exit_boot(sys_table, handle,
-				&new_fdt_addr, efi_get_max_fdt_addr(dram_base),
-				initrd_addr, initrd_size, cmdline_ptr,
-				fdt_addr, fdt_size);
-
-	/*
-	 * If all went well, we need to return the FDT address to the
-	 * calling function so it can be passed to kernel as part of
-	 * the kernel boot protocol.
-	 */
-	if (status == EFI_SUCCESS)
-		return new_fdt_addr;
-
-	pr_efi_err(sys_table, "Failed to update FDT and exit boot services\n");
-
-	efi_free(sys_table, initrd_size, initrd_addr);
-	efi_free(sys_table, fdt_size, fdt_addr);
-
-fail_free_image:
-	efi_free(sys_table, image_size, *image_addr);
-	efi_free(sys_table, reserve_size, reserve_addr);
-fail_free_cmdline:
-	free_screen_info(sys_table, si);
-	efi_free(sys_table, cmdline_size, (unsigned long)cmdline_ptr);
-fail:
-	return EFI_ERROR;
-}
-
-static int cmp_mem_desc(const void *l, const void *r)
-{
-	const efi_memory_desc_t *left = l, *right = r;
-
-	return (left->phys_addr > right->phys_addr) ? 1 : -1;
-}
-
-/*
- * Returns whether region @left ends exactly where region @right starts,
- * or false if either argument is NULL.
- */
-static bool regions_are_adjacent(efi_memory_desc_t *left,
-				 efi_memory_desc_t *right)
-{
-	u64 left_end;
-
-	if (left == NULL || right == NULL)
-		return false;
-
-	left_end = left->phys_addr + left->num_pages * EFI_PAGE_SIZE;
-
-	return left_end == right->phys_addr;
-}
-
-/*
- * Returns whether region @left and region @right have compatible memory type
- * mapping attributes, and are both EFI_MEMORY_RUNTIME regions.
- */
-static bool regions_have_compatible_memory_type_attrs(efi_memory_desc_t *left,
-						      efi_memory_desc_t *right)
-{
-	static const u64 mem_type_mask = EFI_MEMORY_WB | EFI_MEMORY_WT |
-					 EFI_MEMORY_WC | EFI_MEMORY_UC |
-					 EFI_MEMORY_RUNTIME;
-
-	return ((left->attribute ^ right->attribute) & mem_type_mask) == 0;
-}
-
-/*
- * efi_get_virtmap() - create a virtual mapping for the EFI memory map
- *
- * This function populates the virt_addr fields of all memory region descriptors
- * in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors
- * are also copied to @runtime_map, and their total count is returned in @count.
- */
-void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
-		     unsigned long desc_size, efi_memory_desc_t *runtime_map,
-		     int *count)
-{
-	u64 efi_virt_base = virtmap_base;
-	efi_memory_desc_t *in, *prev = NULL, *out = runtime_map;
-	int l;
-
-	/*
-	 * To work around potential issues with the Properties Table feature
-	 * introduced in UEFI 2.5, which may split PE/COFF executable images
-	 * in memory into several RuntimeServicesCode and RuntimeServicesData
-	 * regions, we need to preserve the relative offsets between adjacent
-	 * EFI_MEMORY_RUNTIME regions with the same memory type attributes.
-	 * The easiest way to find adjacent regions is to sort the memory map
-	 * before traversing it.
-	 */
-	sort(memory_map, map_size / desc_size, desc_size, cmp_mem_desc, NULL);
-
-	for (l = 0; l < map_size; l += desc_size, prev = in) {
-		u64 paddr, size;
-
-		in = (void *)memory_map + l;
-		if (!(in->attribute & EFI_MEMORY_RUNTIME))
-			continue;
-
-		paddr = in->phys_addr;
-		size = in->num_pages * EFI_PAGE_SIZE;
-
-		/*
-		 * Make the mapping compatible with 64k pages: this allows
-		 * a 4k page size kernel to kexec a 64k page size kernel and
-		 * vice versa.
-		 */
-		if (!regions_are_adjacent(prev, in) ||
-		    !regions_have_compatible_memory_type_attrs(prev, in)) {
-
-			paddr = round_down(in->phys_addr, SZ_64K);
-			size += in->phys_addr - paddr;
-
-			/*
-			 * Avoid wasting memory on PTEs by choosing a virtual
-			 * base that is compatible with section mappings if this
-			 * region has the appropriate size and physical
-			 * alignment. (Sections are 2 MB on 4k granule kernels)
-			 */
-			if (IS_ALIGNED(in->phys_addr, SZ_2M) && size >= SZ_2M)
-				efi_virt_base = round_up(efi_virt_base, SZ_2M);
-			else
-				efi_virt_base = round_up(efi_virt_base, SZ_64K);
-		}
-
-		in->virt_addr = efi_virt_base + in->phys_addr - paddr;
-		efi_virt_base += size;
-
-		memcpy(out, in, desc_size);
-		out = (void *)out + desc_size;
-		++*count;
-	}
-}