[linux-2.6-block.git] / drivers / firmware / efi / efi-stub-helper.c

/*
 * Helper functions used by the EFI stub on multiple
 * architectures. This should be #included by the EFI stub
 * implementation files.
 *
 * Copyright 2011 Intel Corporation; author Matt Fleming
 *
 * This file is part of the Linux kernel, and is made available
 * under the terms of the GNU General Public License version 2.
 *
 */
#define EFI_READ_CHUNK_SIZE	(1024 * 1024)

struct file_info {
	efi_file_handle_t *handle;
	u64 size;
};


static 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;
	efi_call_phys2(out->output_string, out, str);
}

static void efi_printk(efi_system_table_t *sys_table_arg, char *str)
{
	char *s8;

	for (s8 = str; *s8; s8++) {
		efi_char16_t ch[2] = { 0 };

		ch[0] = *s8;
		if (*s8 == '\n') {
			efi_char16_t nl[2] = { '\r', 0 };
			efi_char16_printk(sys_table_arg, nl);
		}

		efi_char16_printk(sys_table_arg, ch);
	}
}


static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
				       efi_memory_desc_t **map,
				       unsigned long *map_size,
				       unsigned long *desc_size,
				       u32 *desc_ver,
				       unsigned long *key_ptr)
{
	efi_memory_desc_t *m = NULL;
	efi_status_t status;
	unsigned long key;
	u32 desc_version;

	*map_size = sizeof(*m) * 32;
again:
	/*
	 * Add an additional efi_memory_desc_t because we're doing an
	 * allocation which may be in a new descriptor region.
	 */
	*map_size += sizeof(*m);
	status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
				EFI_LOADER_DATA, *map_size, (void **)&m);
	if (status != EFI_SUCCESS)
		goto fail;

	status = efi_call_phys5(sys_table_arg->boottime->get_memory_map,
				map_size, m, &key, desc_size, &desc_version);
	if (status == EFI_BUFFER_TOO_SMALL) {
		efi_call_phys1(sys_table_arg->boottime->free_pool, m);
		goto again;
	}

	if (status != EFI_SUCCESS)
		efi_call_phys1(sys_table_arg->boottime->free_pool, m);
	if (key_ptr && status == EFI_SUCCESS)
		*key_ptr = key;
	if (desc_ver && status == EFI_SUCCESS)
		*desc_ver = desc_version;

fail:
	*map = m;
	return status;
}

/*
 * Allocate at the highest possible address that is not above 'max'.
 */
static efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg,
			       unsigned long size, unsigned long align,
			       unsigned long *addr, unsigned long max)
{
	unsigned long map_size, desc_size;
	efi_memory_desc_t *map;
	efi_status_t status;
	unsigned long nr_pages;
	u64 max_addr = 0;
	int i;

	status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
				    NULL, NULL);
	if (status != EFI_SUCCESS)
		goto fail;

	/*
	 * Enforce minimum alignment that EFI requires when requesting
	 * a specific address.  We are doing page-based allocations,
	 * so we must be aligned to a page.
	 */
	if (align < EFI_PAGE_SIZE)
		align = EFI_PAGE_SIZE;

	nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
again:
	for (i = 0; i < map_size / desc_size; i++) {
		efi_memory_desc_t *desc;
		unsigned long m = (unsigned long)map;
		u64 start, end;

		desc = (efi_memory_desc_t *)(m + (i * desc_size));
		if (desc->type != EFI_CONVENTIONAL_MEMORY)
			continue;

		if (desc->num_pages < nr_pages)
			continue;

		start = desc->phys_addr;
		end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);

		if ((start + size) > end || (start + size) > max)
			continue;

		if (end - size > max)
			end = max;

		if (round_down(end - size, align) < start)
			continue;

		start = round_down(end - size, align);

		/*
		 * Don't allocate at 0x0. It will confuse code that
		 * checks pointers against NULL.
		 */
		if (start == 0x0)
			continue;

		if (start > max_addr)
			max_addr = start;
	}

	if (!max_addr)
		status = EFI_NOT_FOUND;
	else {
		status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
					EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
					nr_pages, &max_addr);
		if (status != EFI_SUCCESS) {
			max = max_addr;
			max_addr = 0;
			goto again;
		}

		*addr = max_addr;
	}

free_pool:
	efi_call_phys1(sys_table_arg->boottime->free_pool, map);

fail:
	return status;
}

/*
 * Allocate at the lowest possible address.
 */
static efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
			      unsigned long size, unsigned long align,
			      unsigned long *addr)
{
	unsigned long map_size, desc_size;
	efi_memory_desc_t *map;
	efi_status_t status;
	unsigned long nr_pages;
	int i;

	status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
				    NULL, NULL);
	if (status != EFI_SUCCESS)
		goto fail;

	/*
	 * Enforce minimum alignment that EFI requires when requesting
	 * a specific address.  We are doing page-based allocations,
	 * so we must be aligned to a page.
	 */
	if (align < EFI_PAGE_SIZE)
		align = EFI_PAGE_SIZE;

	nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
	for (i = 0; i < map_size / desc_size; i++) {
		efi_memory_desc_t *desc;
		unsigned long m = (unsigned long)map;
		u64 start, end;

		desc = (efi_memory_desc_t *)(m + (i * desc_size));

		if (desc->type != EFI_CONVENTIONAL_MEMORY)
			continue;

		if (desc->num_pages < nr_pages)
			continue;

		start = desc->phys_addr;
		end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);

		/*
		 * Don't allocate at 0x0. It will confuse code that
		 * checks pointers against NULL. Skip the first 8
		 * bytes so we start at a nice even number.
		 */
		if (start == 0x0)
			start += 8;

		start = round_up(start, align);
		if ((start + size) > end)
			continue;

		status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
					EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
					nr_pages, &start);
		if (status == EFI_SUCCESS) {
			*addr = start;
			break;
		}
	}

	if (i == map_size / desc_size)
		status = EFI_NOT_FOUND;

free_pool:
	efi_call_phys1(sys_table_arg->boottime->free_pool, map);
fail:
	return status;
}

static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size,
		     unsigned long addr)
{
	unsigned long nr_pages;

	if (!size)
		return;

	nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
	efi_call_phys2(sys_table_arg->boottime->free_pages, addr, nr_pages);
}


/*
 * Check the cmdline for a LILO-style file= arguments.
 *
 * We only support loading a file from the same filesystem as
 * the kernel image.
 */
static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
					 efi_loaded_image_t *image,
					 char *cmd_line, char *option_string,
					 unsigned long max_addr,
					 unsigned long *load_addr,
					 unsigned long *load_size)
{
	struct file_info *files;
	unsigned long file_addr;
	efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
	u64 file_size_total;
	efi_file_io_interface_t *io;
	efi_file_handle_t *fh;
	efi_status_t status;
	int nr_files;
	char *str;
	int i, j, k;

	file_addr = 0;
	file_size_total = 0;

	str = cmd_line;

	j = 0;			/* See close_handles */

	if (!load_addr || !load_size)
		return EFI_INVALID_PARAMETER;

	*load_addr = 0;
	*load_size = 0;

	if (!str || !*str)
		return EFI_SUCCESS;

	for (nr_files = 0; *str; nr_files++) {
		str = strstr(str, option_string);
		if (!str)
			break;

		str += strlen(option_string);

		/* Skip any leading slashes */
		while (*str == '/' || *str == '\\')
			str++;

		while (*str && *str != ' ' && *str != '\n')
			str++;
	}

	if (!nr_files)
		return EFI_SUCCESS;

	status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
				EFI_LOADER_DATA,
				nr_files * sizeof(*files),
				&files);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table_arg, "Failed to alloc mem for file handle list\n");
		goto fail;
	}

	str = cmd_line;
	for (i = 0; i < nr_files; i++) {
		struct file_info *file;
		efi_file_handle_t *h;
		efi_file_info_t *info;
		efi_char16_t filename_16[256];
		unsigned long info_sz;
		efi_guid_t info_guid = EFI_FILE_INFO_ID;
		efi_char16_t *p;
		u64 file_sz;

		str = strstr(str, option_string);
		if (!str)
			break;

		str += strlen(option_string);

		file = &files[i];
		p = filename_16;

		/* Skip any leading slashes */
		while (*str == '/' || *str == '\\')
			str++;

		while (*str && *str != ' ' && *str != '\n') {
			if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
				break;

			if (*str == '/') {
				*p++ = '\\';
				*str++;
			} else {
				*p++ = *str++;
			}
		}

		*p = '\0';

		/* Only open the volume once. */
		if (!i) {
			efi_boot_services_t *boottime;

			boottime = sys_table_arg->boottime;

			status = efi_call_phys3(boottime->handle_protocol,
					image->device_handle, &fs_proto, &io);
			if (status != EFI_SUCCESS) {
				efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
				goto free_files;
			}

			status = efi_call_phys2(io->open_volume, io, &fh);
			if (status != EFI_SUCCESS) {
				efi_printk(sys_table_arg, "Failed to open volume\n");
				goto free_files;
			}
		}

		status = efi_call_phys5(fh->open, fh, &h, filename_16,
					EFI_FILE_MODE_READ, (u64)0);
		if (status != EFI_SUCCESS) {
			efi_printk(sys_table_arg, "Failed to open file: ");
			efi_char16_printk(sys_table_arg, filename_16);
			efi_printk(sys_table_arg, "\n");
			goto close_handles;
		}

		file->handle = h;

		info_sz = 0;
		status = efi_call_phys4(h->get_info, h, &info_guid,
					&info_sz, NULL);
		if (status != EFI_BUFFER_TOO_SMALL) {
			efi_printk(sys_table_arg, "Failed to get file info size\n");
			goto close_handles;
		}

grow:
		status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
					EFI_LOADER_DATA, info_sz, &info);
		if (status != EFI_SUCCESS) {
			efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
			goto close_handles;
		}

		status = efi_call_phys4(h->get_info, h, &info_guid,
					&info_sz, info);
		if (status == EFI_BUFFER_TOO_SMALL) {
			efi_call_phys1(sys_table_arg->boottime->free_pool,
				       info);
			goto grow;
		}

		file_sz = info->file_size;
		efi_call_phys1(sys_table_arg->boottime->free_pool, info);

		if (status != EFI_SUCCESS) {
			efi_printk(sys_table_arg, "Failed to get file info\n");
			goto close_handles;
		}

		file->size = file_sz;
		file_size_total += file_sz;
	}

	if (file_size_total) {
		unsigned long addr;

		/*
		 * Multiple files need to be at consecutive addresses in memory,
		 * so allocate enough memory for all the files.  This is used
		 * for loading multiple files.
		 */
		status = efi_high_alloc(sys_table_arg, file_size_total, 0x1000,
				    &file_addr, max_addr);
		if (status != EFI_SUCCESS) {
			efi_printk(sys_table_arg, "Failed to alloc highmem for files\n");
			goto close_handles;
		}

		/* We've run out of free low memory. */
		if (file_addr > max_addr) {
			efi_printk(sys_table_arg, "We've run out of free low memory\n");
			status = EFI_INVALID_PARAMETER;
			goto free_file_total;
		}

		addr = file_addr;
		for (j = 0; j < nr_files; j++) {
			u64 size;

			size = files[j].size;
			while (size) {
				u64 chunksize;
				if (size > EFI_READ_CHUNK_SIZE)
					chunksize = EFI_READ_CHUNK_SIZE;
				else
					chunksize = size;
				status = efi_call_phys3(fh->read,
							files[j].handle,
							&chunksize, addr);
				if (status != EFI_SUCCESS) {
					efi_printk(sys_table_arg, "Failed to read file\n");
					goto free_file_total;
				}
				addr += chunksize;
				size -= chunksize;
			}

			efi_call_phys1(fh->close, files[j].handle);
		}

	}

	efi_call_phys1(sys_table_arg->boottime->free_pool, files);

	*load_addr = file_addr;
	*load_size = file_size_total;

	return status;

free_file_total:
	efi_free(sys_table_arg, file_size_total, file_addr);

close_handles:
	for (k = j; k < i; k++)
		efi_call_phys1(fh->close, files[k].handle);
free_files:
	efi_call_phys1(sys_table_arg->boottime->free_pool, files);
fail:
	*load_addr = 0;
	*load_size = 0;

	return status;
}
/*
 * Relocate a kernel image, either compressed or uncompressed.
 * In the ARM64 case, all kernel images are currently
 * uncompressed, and as such when we relocate it we need to
 * allocate additional space for the BSS segment. Any low
 * memory that this function should avoid needs to be
 * unavailable in the EFI memory map, as if the preferred
 * address is not available the lowest available address will
 * be used.
 */
static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
					unsigned long *image_addr,
					unsigned long image_size,
					unsigned long alloc_size,
					unsigned long preferred_addr,
					unsigned long alignment)
{
	unsigned long cur_image_addr;
	unsigned long new_addr = 0;
	efi_status_t status;
	unsigned long nr_pages;
	efi_physical_addr_t efi_addr = preferred_addr;

	if (!image_addr || !image_size || !alloc_size)
		return EFI_INVALID_PARAMETER;
	if (alloc_size < image_size)
		return EFI_INVALID_PARAMETER;

	cur_image_addr = *image_addr;

	/*
	 * The EFI firmware loader could have placed the kernel image
	 * anywhere in memory, but the kernel has restrictions on the
	 * max physical address it can run at.  Some architectures
	 * also have a prefered address, so first try to relocate
	 * to the preferred address.  If that fails, allocate as low
	 * as possible while respecting the required alignment.
	 */
	nr_pages = round_up(alloc_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
	status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
				EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
				nr_pages, &efi_addr);
	new_addr = efi_addr;
	/*
	 * If preferred address allocation failed allocate as low as
	 * possible.
	 */
	if (status != EFI_SUCCESS) {
		status = efi_low_alloc(sys_table_arg, alloc_size, alignment,
				       &new_addr);
	}
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table_arg, "ERROR: Failed to allocate usable memory for kernel.\n");
		return status;
	}

	/*
	 * We know source/dest won't overlap since both memory ranges
	 * have been allocated by UEFI, so we can safely use memcpy.
	 */
	memcpy((void *)new_addr, (void *)cur_image_addr, image_size);
	/* Zero any extra space we may have allocated for BSS. */
	memset((void *)(new_addr + image_size), alloc_size - image_size, 0);

	/* Return the new address of the relocated image. */
	*image_addr = new_addr;

	return status;
}

/*
 * Convert the unicode UEFI command line to ASCII to pass to kernel.
 * Size of memory allocated return in *cmd_line_len.
 * Returns NULL on error.
 */
static char *efi_convert_cmdline_to_ascii(efi_system_table_t *sys_table_arg,
				      efi_loaded_image_t *image,
				      int *cmd_line_len)
{
	u16 *s2;
	u8 *s1 = NULL;
	unsigned long cmdline_addr = 0;
	int load_options_size = image->load_options_size / 2; /* ASCII */
	void *options = image->load_options;
	int options_size = 0;
	efi_status_t status;
	int i;
	u16 zero = 0;

	if (options) {
		s2 = options;
		while (*s2 && *s2 != '\n' && options_size < load_options_size) {
			s2++;
			options_size++;
		}
	}

	if (options_size == 0) {
		/* No command line options, so return empty string*/
		options_size = 1;
		options = &zero;
	}

	options_size++;  /* NUL termination */
#ifdef CONFIG_ARM
	/*
	 * For ARM, allocate at a high address to avoid reserved
	 * regions at low addresses that we don't know the specfics of
	 * at the time we are processing the command line.
	 */
	status = efi_high_alloc(sys_table_arg, options_size, 0,
			    &cmdline_addr, 0xfffff000);
#else
	status = efi_low_alloc(sys_table_arg, options_size, 0,
			    &cmdline_addr);
#endif
	if (status != EFI_SUCCESS)
		return NULL;

	s1 = (u8 *)cmdline_addr;
	s2 = (u16 *)options;

	for (i = 0; i < options_size - 1; i++)
		*s1++ = *s2++;

	*s1 = '\0';

	*cmd_line_len = options_size;
	return (char *)cmdline_addr;
}
Commit	Line	Data
7721da4c RF	1	/*
	2	* Helper functions used by the EFI stub on multiple
	3	* architectures. This should be #included by the EFI stub
	4	* implementation files.
	5	*
	6	* Copyright 2011 Intel Corporation; author Matt Fleming
	7	*
	8	* This file is part of the Linux kernel, and is made available
	9	* under the terms of the GNU General Public License version 2.
	10	*
	11	*/
	12	#define EFI_READ_CHUNK_SIZE (1024 * 1024)
	13
36f8961c	14	struct file_info {
7721da4c RF	15	efi_file_handle_t *handle;
	16	u64 size;
	17	};
	18
	19
	20
	21
876dc36a RF	22	static void efi_char16_printk(efi_system_table_t *sys_table_arg,
876dc36a RF	23	efi_char16_t *str)
7721da4c RF	24	{
	25	struct efi_simple_text_output_protocol *out;
	26
876dc36a	27	out = (struct efi_simple_text_output_protocol *)sys_table_arg->con_out;
7721da4c RF	28	efi_call_phys2(out->output_string, out, str);
	29	}
	30
876dc36a	31	static void efi_printk(efi_system_table_t sys_table_arg, char str)
7721da4c RF	32	{
	33	char *s8;
	34
	35	for (s8 = str; *s8; s8++) {
	36	efi_char16_t ch[2] = { 0 };
	37
	38	ch[0] = *s8;
	39	if (*s8 == '\n') {
	40	efi_char16_t nl[2] = { '\r', 0 };
876dc36a	41	efi_char16_printk(sys_table_arg, nl);
7721da4c RF	42	}
7721da4c RF	43
876dc36a	44	efi_char16_printk(sys_table_arg, ch);
7721da4c RF	45	}
	46	}
	47
	48
86cc653b RF	49	static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
	50	efi_memory_desc_t **map,
	51	unsigned long *map_size,
1c089c65 RF	52	unsigned long *desc_size,
	53	u32 *desc_ver,
	54	unsigned long *key_ptr)
7721da4c RF	55	{
	56	efi_memory_desc_t *m = NULL;
	57	efi_status_t status;
	58	unsigned long key;
	59	u32 desc_version;
	60
	61	map_size = sizeof(m) * 32;
	62	again:
	63	/*
	64	* Add an additional efi_memory_desc_t because we're doing an
	65	* allocation which may be in a new descriptor region.
	66	*/
	67	map_size += sizeof(m);
876dc36a	68	status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
7721da4c RF	69	EFI_LOADER_DATA, map_size, (void *)&m);
	70	if (status != EFI_SUCCESS)
	71	goto fail;
	72
876dc36a RF	73	status = efi_call_phys5(sys_table_arg->boottime->get_memory_map,
876dc36a RF	74	map_size, m, &key, desc_size, &desc_version);
7721da4c	75	if (status == EFI_BUFFER_TOO_SMALL) {
876dc36a	76	efi_call_phys1(sys_table_arg->boottime->free_pool, m);
7721da4c RF	77	goto again;
	78	}
	79
	80	if (status != EFI_SUCCESS)
876dc36a	81	efi_call_phys1(sys_table_arg->boottime->free_pool, m);
1c089c65 RF	82	if (key_ptr && status == EFI_SUCCESS)
	83	*key_ptr = key;
	84	if (desc_ver && status == EFI_SUCCESS)
	85	*desc_ver = desc_version;
7721da4c RF	86
	87	fail:
	88	*map = m;
	89	return status;
	90	}
	91
	92	/*
	93	* Allocate at the highest possible address that is not above 'max'.
	94	*/
40e4530a	95	static efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg,
876dc36a RF	96	unsigned long size, unsigned long align,
876dc36a RF	97	unsigned long *addr, unsigned long max)
7721da4c RF	98	{
	99	unsigned long map_size, desc_size;
	100	efi_memory_desc_t *map;
	101	efi_status_t status;
	102	unsigned long nr_pages;
	103	u64 max_addr = 0;
	104	int i;
	105
1c089c65 RF	106	status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
1c089c65 RF	107	NULL, NULL);
7721da4c RF	108	if (status != EFI_SUCCESS)
	109	goto fail;
	110
38dd9c02 RF	111	/*
	112	* Enforce minimum alignment that EFI requires when requesting
	113	* a specific address. We are doing page-based allocations,
	114	* so we must be aligned to a page.
	115	*/
	116	if (align < EFI_PAGE_SIZE)
	117	align = EFI_PAGE_SIZE;
	118
7721da4c RF	119	nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
	120	again:
	121	for (i = 0; i < map_size / desc_size; i++) {
	122	efi_memory_desc_t *desc;
	123	unsigned long m = (unsigned long)map;
	124	u64 start, end;
	125
	126	desc = (efi_memory_desc_t )(m + (i desc_size));
	127	if (desc->type != EFI_CONVENTIONAL_MEMORY)
	128	continue;
	129
	130	if (desc->num_pages < nr_pages)
	131	continue;
	132
	133	start = desc->phys_addr;
	134	end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
	135
	136	if ((start + size) > end \|\| (start + size) > max)
	137	continue;
	138
	139	if (end - size > max)
	140	end = max;
	141
	142	if (round_down(end - size, align) < start)
	143	continue;
	144
	145	start = round_down(end - size, align);
	146
	147	/*
	148	* Don't allocate at 0x0. It will confuse code that
	149	* checks pointers against NULL.
	150	*/
	151	if (start == 0x0)
	152	continue;
	153
	154	if (start > max_addr)
	155	max_addr = start;
	156	}
	157
	158	if (!max_addr)
	159	status = EFI_NOT_FOUND;
	160	else {
876dc36a	161	status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
7721da4c RF	162	EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
	163	nr_pages, &max_addr);
	164	if (status != EFI_SUCCESS) {
	165	max = max_addr;
	166	max_addr = 0;
	167	goto again;
	168	}
	169
	170	*addr = max_addr;
	171	}
	172
	173	free_pool:
876dc36a	174	efi_call_phys1(sys_table_arg->boottime->free_pool, map);
7721da4c RF	175
	176	fail:
	177	return status;
	178	}
	179
	180	/*
	181	* Allocate at the lowest possible address.
	182	*/
40e4530a RF	183	static efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
40e4530a RF	184	unsigned long size, unsigned long align,
7721da4c RF	185	unsigned long *addr)
	186	{
	187	unsigned long map_size, desc_size;
	188	efi_memory_desc_t *map;
	189	efi_status_t status;
	190	unsigned long nr_pages;
	191	int i;
	192
1c089c65 RF	193	status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
1c089c65 RF	194	NULL, NULL);
7721da4c RF	195	if (status != EFI_SUCCESS)
	196	goto fail;
	197
38dd9c02 RF	198	/*
	199	* Enforce minimum alignment that EFI requires when requesting
	200	* a specific address. We are doing page-based allocations,
	201	* so we must be aligned to a page.
	202	*/
	203	if (align < EFI_PAGE_SIZE)
	204	align = EFI_PAGE_SIZE;
	205
7721da4c RF	206	nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
	207	for (i = 0; i < map_size / desc_size; i++) {
	208	efi_memory_desc_t *desc;
	209	unsigned long m = (unsigned long)map;
	210	u64 start, end;
	211
	212	desc = (efi_memory_desc_t )(m + (i desc_size));
	213
	214	if (desc->type != EFI_CONVENTIONAL_MEMORY)
	215	continue;
	216
	217	if (desc->num_pages < nr_pages)
	218	continue;
	219
	220	start = desc->phys_addr;
	221	end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
	222
	223	/*
	224	* Don't allocate at 0x0. It will confuse code that
	225	* checks pointers against NULL. Skip the first 8
	226	* bytes so we start at a nice even number.
	227	*/
	228	if (start == 0x0)
	229	start += 8;
	230
	231	start = round_up(start, align);
	232	if ((start + size) > end)
	233	continue;
	234
876dc36a	235	status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
7721da4c RF	236	EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
	237	nr_pages, &start);
	238	if (status == EFI_SUCCESS) {
	239	*addr = start;
	240	break;
	241	}
	242	}
	243
	244	if (i == map_size / desc_size)
	245	status = EFI_NOT_FOUND;
	246
	247	free_pool:
876dc36a	248	efi_call_phys1(sys_table_arg->boottime->free_pool, map);
7721da4c RF	249	fail:
	250	return status;
	251	}
	252
40e4530a	253	static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size,
876dc36a	254	unsigned long addr)
7721da4c RF	255	{
	256	unsigned long nr_pages;
	257
0e1cadb0 RF	258	if (!size)
	259	return;
	260
7721da4c	261	nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
876dc36a	262	efi_call_phys2(sys_table_arg->boottime->free_pages, addr, nr_pages);
7721da4c RF	263	}
	264
	265
	266	/*
36f8961c	267	* Check the cmdline for a LILO-style file= arguments.
7721da4c	268	*
36f8961c RF	269	* We only support loading a file from the same filesystem as
36f8961c RF	270	* the kernel image.
7721da4c	271	*/
46f4582e RF	272	static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
	273	efi_loaded_image_t *image,
	274	char cmd_line, char option_string,
	275	unsigned long max_addr,
	276	unsigned long *load_addr,
	277	unsigned long *load_size)
7721da4c	278	{
36f8961c RF	279	struct file_info *files;
36f8961c RF	280	unsigned long file_addr;
7721da4c	281	efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
36f8961c	282	u64 file_size_total;
7721da4c RF	283	efi_file_io_interface_t *io;
	284	efi_file_handle_t *fh;
	285	efi_status_t status;
36f8961c	286	int nr_files;
7721da4c RF	287	char *str;
	288	int i, j, k;
	289
36f8961c RF	290	file_addr = 0;
36f8961c RF	291	file_size_total = 0;
7721da4c	292
46f4582e	293	str = cmd_line;
7721da4c RF	294
	295	j = 0; /* See close_handles */
	296
46f4582e RF	297	if (!load_addr \|\| !load_size)
	298	return EFI_INVALID_PARAMETER;
	299
	300	*load_addr = 0;
	301	*load_size = 0;
	302
7721da4c RF	303	if (!str \|\| !*str)
	304	return EFI_SUCCESS;
	305
36f8961c	306	for (nr_files = 0; *str; nr_files++) {
46f4582e	307	str = strstr(str, option_string);
7721da4c RF	308	if (!str)
	309	break;
	310
46f4582e	311	str += strlen(option_string);
7721da4c RF	312
	313	/* Skip any leading slashes */
	314	while (str == '/' \|\| str == '\\')
	315	str++;
	316
	317	while (str && str != ' ' && *str != '\n')
	318	str++;
	319	}
	320
36f8961c	321	if (!nr_files)
7721da4c RF	322	return EFI_SUCCESS;
7721da4c RF	323
876dc36a	324	status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
7721da4c	325	EFI_LOADER_DATA,
36f8961c RF	326	nr_files * sizeof(*files),
36f8961c RF	327	&files);
7721da4c	328	if (status != EFI_SUCCESS) {
36f8961c	329	efi_printk(sys_table_arg, "Failed to alloc mem for file handle list\n");
7721da4c RF	330	goto fail;
	331	}
	332
46f4582e	333	str = cmd_line;
36f8961c RF	334	for (i = 0; i < nr_files; i++) {
36f8961c RF	335	struct file_info *file;
7721da4c RF	336	efi_file_handle_t *h;
	337	efi_file_info_t *info;
	338	efi_char16_t filename_16[256];
	339	unsigned long info_sz;
	340	efi_guid_t info_guid = EFI_FILE_INFO_ID;
	341	efi_char16_t *p;
	342	u64 file_sz;
	343
46f4582e	344	str = strstr(str, option_string);
7721da4c RF	345	if (!str)
	346	break;
	347
46f4582e	348	str += strlen(option_string);
7721da4c	349
36f8961c	350	file = &files[i];
7721da4c RF	351	p = filename_16;
	352
	353	/* Skip any leading slashes */
	354	while (str == '/' \|\| str == '\\')
	355	str++;
	356
	357	while (str && str != ' ' && *str != '\n') {
	358	if ((u8 )p >= (u8 )filename_16 + sizeof(filename_16))
	359	break;
	360
	361	if (*str == '/') {
	362	*p++ = '\\';
	363	*str++;
	364	} else {
	365	p++ = str++;
	366	}
	367	}
	368
	369	*p = '\0';
	370
	371	/* Only open the volume once. */
	372	if (!i) {
	373	efi_boot_services_t *boottime;
	374
876dc36a	375	boottime = sys_table_arg->boottime;
7721da4c RF	376
	377	status = efi_call_phys3(boottime->handle_protocol,
	378	image->device_handle, &fs_proto, &io);
	379	if (status != EFI_SUCCESS) {
876dc36a	380	efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
36f8961c	381	goto free_files;
7721da4c RF	382	}
	383
	384	status = efi_call_phys2(io->open_volume, io, &fh);
	385	if (status != EFI_SUCCESS) {
876dc36a	386	efi_printk(sys_table_arg, "Failed to open volume\n");
36f8961c	387	goto free_files;
7721da4c RF	388	}
	389	}
	390
	391	status = efi_call_phys5(fh->open, fh, &h, filename_16,
	392	EFI_FILE_MODE_READ, (u64)0);
	393	if (status != EFI_SUCCESS) {
46f4582e	394	efi_printk(sys_table_arg, "Failed to open file: ");
876dc36a RF	395	efi_char16_printk(sys_table_arg, filename_16);
876dc36a RF	396	efi_printk(sys_table_arg, "\n");
7721da4c RF	397	goto close_handles;
	398	}
	399
36f8961c	400	file->handle = h;
7721da4c RF	401
	402	info_sz = 0;
	403	status = efi_call_phys4(h->get_info, h, &info_guid,
	404	&info_sz, NULL);
	405	if (status != EFI_BUFFER_TOO_SMALL) {
46f4582e	406	efi_printk(sys_table_arg, "Failed to get file info size\n");
7721da4c RF	407	goto close_handles;
	408	}
	409
	410	grow:
876dc36a	411	status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
7721da4c RF	412	EFI_LOADER_DATA, info_sz, &info);
7721da4c RF	413	if (status != EFI_SUCCESS) {
46f4582e	414	efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
7721da4c RF	415	goto close_handles;
	416	}
	417
	418	status = efi_call_phys4(h->get_info, h, &info_guid,
	419	&info_sz, info);
	420	if (status == EFI_BUFFER_TOO_SMALL) {
876dc36a RF	421	efi_call_phys1(sys_table_arg->boottime->free_pool,
876dc36a RF	422	info);
7721da4c RF	423	goto grow;
	424	}
	425
	426	file_sz = info->file_size;
876dc36a	427	efi_call_phys1(sys_table_arg->boottime->free_pool, info);
7721da4c RF	428
7721da4c RF	429	if (status != EFI_SUCCESS) {
46f4582e	430	efi_printk(sys_table_arg, "Failed to get file info\n");
7721da4c RF	431	goto close_handles;
	432	}
	433
36f8961c RF	434	file->size = file_sz;
36f8961c RF	435	file_size_total += file_sz;
7721da4c RF	436	}
7721da4c RF	437
36f8961c	438	if (file_size_total) {
7721da4c RF	439	unsigned long addr;
	440
	441	/*
36f8961c RF	442	* Multiple files need to be at consecutive addresses in memory,
	443	* so allocate enough memory for all the files. This is used
	444	* for loading multiple files.
7721da4c	445	*/
36f8961c RF	446	status = efi_high_alloc(sys_table_arg, file_size_total, 0x1000,
36f8961c RF	447	&file_addr, max_addr);
7721da4c	448	if (status != EFI_SUCCESS) {
36f8961c	449	efi_printk(sys_table_arg, "Failed to alloc highmem for files\n");
7721da4c RF	450	goto close_handles;
	451	}
	452
	453	/* We've run out of free low memory. */
36f8961c	454	if (file_addr > max_addr) {
876dc36a	455	efi_printk(sys_table_arg, "We've run out of free low memory\n");
7721da4c	456	status = EFI_INVALID_PARAMETER;
36f8961c	457	goto free_file_total;
7721da4c RF	458	}
7721da4c RF	459
36f8961c RF	460	addr = file_addr;
36f8961c RF	461	for (j = 0; j < nr_files; j++) {
7721da4c RF	462	u64 size;
7721da4c RF	463
36f8961c	464	size = files[j].size;
7721da4c RF	465	while (size) {
	466	u64 chunksize;
	467	if (size > EFI_READ_CHUNK_SIZE)
	468	chunksize = EFI_READ_CHUNK_SIZE;
	469	else
	470	chunksize = size;
	471	status = efi_call_phys3(fh->read,
36f8961c	472	files[j].handle,
7721da4c RF	473	&chunksize, addr);
7721da4c RF	474	if (status != EFI_SUCCESS) {
46f4582e	475	efi_printk(sys_table_arg, "Failed to read file\n");
36f8961c	476	goto free_file_total;
7721da4c RF	477	}
	478	addr += chunksize;
	479	size -= chunksize;
	480	}
	481
36f8961c	482	efi_call_phys1(fh->close, files[j].handle);
7721da4c RF	483	}
	484
	485	}
	486
36f8961c	487	efi_call_phys1(sys_table_arg->boottime->free_pool, files);
7721da4c	488
36f8961c RF	489	*load_addr = file_addr;
36f8961c RF	490	*load_size = file_size_total;
7721da4c RF	491
	492	return status;
	493
36f8961c RF	494	free_file_total:
36f8961c RF	495	efi_free(sys_table_arg, file_size_total, file_addr);
7721da4c RF	496
	497	close_handles:
	498	for (k = j; k < i; k++)
36f8961c RF	499	efi_call_phys1(fh->close, files[k].handle);
	500	free_files:
	501	efi_call_phys1(sys_table_arg->boottime->free_pool, files);
7721da4c	502	fail:
46f4582e RF	503	*load_addr = 0;
46f4582e RF	504	*load_size = 0;
7721da4c RF	505
	506	return status;
	507	}
4a9f3a7c RF	508	/*
	509	* Relocate a kernel image, either compressed or uncompressed.
	510	* In the ARM64 case, all kernel images are currently
	511	* uncompressed, and as such when we relocate it we need to
	512	* allocate additional space for the BSS segment. Any low
	513	* memory that this function should avoid needs to be
	514	* unavailable in the EFI memory map, as if the preferred
	515	* address is not available the lowest available address will
	516	* be used.
	517	*/
	518	static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
	519	unsigned long *image_addr,
	520	unsigned long image_size,
	521	unsigned long alloc_size,
	522	unsigned long preferred_addr,
	523	unsigned long alignment)
c6866d72	524	{
4a9f3a7c RF	525	unsigned long cur_image_addr;
4a9f3a7c RF	526	unsigned long new_addr = 0;
c6866d72	527	efi_status_t status;
4a9f3a7c RF	528	unsigned long nr_pages;
	529	efi_physical_addr_t efi_addr = preferred_addr;
	530
	531	if (!image_addr \|\| !image_size \|\| !alloc_size)
	532	return EFI_INVALID_PARAMETER;
	533	if (alloc_size < image_size)
	534	return EFI_INVALID_PARAMETER;
	535
	536	cur_image_addr = *image_addr;
c6866d72 RF	537
	538	/*
	539	* The EFI firmware loader could have placed the kernel image
4a9f3a7c RF	540	* anywhere in memory, but the kernel has restrictions on the
	541	* max physical address it can run at. Some architectures
	542	* also have a prefered address, so first try to relocate
	543	* to the preferred address. If that fails, allocate as low
	544	* as possible while respecting the required alignment.
c6866d72	545	*/
4a9f3a7c RF	546	nr_pages = round_up(alloc_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
4a9f3a7c RF	547	status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
c6866d72	548	EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
4a9f3a7c RF	549	nr_pages, &efi_addr);
	550	new_addr = efi_addr;
	551	/*
	552	* If preferred address allocation failed allocate as low as
	553	* possible.
	554	*/
c6866d72	555	if (status != EFI_SUCCESS) {
4a9f3a7c RF	556	status = efi_low_alloc(sys_table_arg, alloc_size, alignment,
	557	&new_addr);
	558	}
	559	if (status != EFI_SUCCESS) {
	560	efi_printk(sys_table_arg, "ERROR: Failed to allocate usable memory for kernel.\n");
	561	return status;
c6866d72 RF	562	}
c6866d72 RF	563
4a9f3a7c RF	564	/*
	565	* We know source/dest won't overlap since both memory ranges
	566	* have been allocated by UEFI, so we can safely use memcpy.
	567	*/
	568	memcpy((void )new_addr, (void )cur_image_addr, image_size);
	569	/* Zero any extra space we may have allocated for BSS. */
	570	memset((void *)(new_addr + image_size), alloc_size - image_size, 0);
c6866d72	571
4a9f3a7c RF	572	/* Return the new address of the relocated image. */
4a9f3a7c RF	573	*image_addr = new_addr;
c6866d72 RF	574
	575	return status;
	576	}
5fef3870 RF	577
	578	/*
	579	* Convert the unicode UEFI command line to ASCII to pass to kernel.
	580	* Size of memory allocated return in *cmd_line_len.
	581	* Returns NULL on error.
	582	*/
	583	static char efi_convert_cmdline_to_ascii(efi_system_table_t sys_table_arg,
	584	efi_loaded_image_t *image,
	585	int *cmd_line_len)
	586	{
	587	u16 *s2;
	588	u8 *s1 = NULL;
	589	unsigned long cmdline_addr = 0;
	590	int load_options_size = image->load_options_size / 2; /* ASCII */
	591	void *options = image->load_options;
	592	int options_size = 0;
	593	efi_status_t status;
	594	int i;
	595	u16 zero = 0;
	596
	597	if (options) {
	598	s2 = options;
	599	while (s2 && s2 != '\n' && options_size < load_options_size) {
	600	s2++;
	601	options_size++;
	602	}
	603	}
	604
	605	if (options_size == 0) {
	606	/* No command line options, so return empty string*/
	607	options_size = 1;
	608	options = &zero;
	609	}
	610
	611	options_size++; /* NUL termination */
	612	#ifdef CONFIG_ARM
	613	/*
	614	* For ARM, allocate at a high address to avoid reserved
	615	* regions at low addresses that we don't know the specfics of
	616	* at the time we are processing the command line.
	617	*/
	618	status = efi_high_alloc(sys_table_arg, options_size, 0,
	619	&cmdline_addr, 0xfffff000);
	620	#else
	621	status = efi_low_alloc(sys_table_arg, options_size, 0,
	622	&cmdline_addr);
	623	#endif
	624	if (status != EFI_SUCCESS)
	625	return NULL;
	626
	627	s1 = (u8 *)cmdline_addr;
	628	s2 = (u16 *)options;
	629
	630	for (i = 0; i < options_size - 1; i++)
	631	s1++ = s2++;
	632
	633	*s1 = '\0';
	634
	635	*cmd_line_len = options_size;
	636	return (char *)cmdline_addr;
	637	}