[mirror_ubuntu-eoan-kernel.git] / arch / x86 / kernel / kexec-bzimage64.c

/*
 * Kexec bzImage loader
 *
 * Copyright (C) 2014 Red Hat Inc.
 * Authors:
 *      Vivek Goyal <vgoyal@redhat.com>
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

#define pr_fmt(fmt)	"kexec-bzImage64: " fmt

#include <linux/string.h>
#include <linux/printk.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/kexec.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/efi.h>
#include <linux/verification.h>

#include <asm/bootparam.h>
#include <asm/setup.h>
#include <asm/crash.h>
#include <asm/efi.h>
#include <asm/e820/api.h>
#include <asm/kexec-bzimage64.h>

#define MAX_ELFCOREHDR_STR_LEN	30	/* elfcorehdr=0x<64bit-value> */

/*
 * Defines lowest physical address for various segments. Not sure where
 * exactly these limits came from. Current bzimage64 loader in kexec-tools
 * uses these so I am retaining it. It can be changed over time as we gain
 * more insight.
 */
#define MIN_PURGATORY_ADDR	0x3000
#define MIN_BOOTPARAM_ADDR	0x3000
#define MIN_KERNEL_LOAD_ADDR	0x100000
#define MIN_INITRD_LOAD_ADDR	0x1000000

/*
 * This is a place holder for all boot loader specific data structure which
 * gets allocated in one call but gets freed much later during cleanup
 * time. Right now there is only one field but it can grow as need be.
 */
struct bzimage64_data {
	/*
	 * Temporary buffer to hold bootparams buffer. This should be
	 * freed once the bootparam segment has been loaded.
	 */
	void *bootparams_buf;
};

static int setup_initrd(struct boot_params *params,
		unsigned long initrd_load_addr, unsigned long initrd_len)
{
	params->hdr.ramdisk_image = initrd_load_addr & 0xffffffffUL;
	params->hdr.ramdisk_size = initrd_len & 0xffffffffUL;

	params->ext_ramdisk_image = initrd_load_addr >> 32;
	params->ext_ramdisk_size = initrd_len >> 32;

	return 0;
}

static int setup_cmdline(struct kimage *image, struct boot_params *params,
			 unsigned long bootparams_load_addr,
			 unsigned long cmdline_offset, char *cmdline,
			 unsigned long cmdline_len)
{
	char *cmdline_ptr = ((char *)params) + cmdline_offset;
	unsigned long cmdline_ptr_phys, len = 0;
	uint32_t cmdline_low_32, cmdline_ext_32;

	if (image->type == KEXEC_TYPE_CRASH) {
		len = sprintf(cmdline_ptr,
			"elfcorehdr=0x%lx ", image->arch.elf_load_addr);
	}
	memcpy(cmdline_ptr + len, cmdline, cmdline_len);
	cmdline_len += len;

	cmdline_ptr[cmdline_len - 1] = '\0';

	pr_debug("Final command line is: %s\n", cmdline_ptr);
	cmdline_ptr_phys = bootparams_load_addr + cmdline_offset;
	cmdline_low_32 = cmdline_ptr_phys & 0xffffffffUL;
	cmdline_ext_32 = cmdline_ptr_phys >> 32;

	params->hdr.cmd_line_ptr = cmdline_low_32;
	if (cmdline_ext_32)
		params->ext_cmd_line_ptr = cmdline_ext_32;

	return 0;
}

static int setup_e820_entries(struct boot_params *params)
{
	unsigned int nr_e820_entries;

	nr_e820_entries = e820_table_kexec->nr_entries;

	/* TODO: Pass entries more than E820_MAX_ENTRIES_ZEROPAGE in bootparams setup data */
	if (nr_e820_entries > E820_MAX_ENTRIES_ZEROPAGE)
		nr_e820_entries = E820_MAX_ENTRIES_ZEROPAGE;

	params->e820_entries = nr_e820_entries;
	memcpy(&params->e820_table, &e820_table_kexec->entries, nr_e820_entries*sizeof(struct e820_entry));

	return 0;
}

#ifdef CONFIG_EFI
static int setup_efi_info_memmap(struct boot_params *params,
				  unsigned long params_load_addr,
				  unsigned int efi_map_offset,
				  unsigned int efi_map_sz)
{
	void *efi_map = (void *)params + efi_map_offset;
	unsigned long efi_map_phys_addr = params_load_addr + efi_map_offset;
	struct efi_info *ei = &params->efi_info;

	if (!efi_map_sz)
		return 0;

	efi_runtime_map_copy(efi_map, efi_map_sz);

	ei->efi_memmap = efi_map_phys_addr & 0xffffffff;
	ei->efi_memmap_hi = efi_map_phys_addr >> 32;
	ei->efi_memmap_size = efi_map_sz;

	return 0;
}

static int
prepare_add_efi_setup_data(struct boot_params *params,
		       unsigned long params_load_addr,
		       unsigned int efi_setup_data_offset)
{
	unsigned long setup_data_phys;
	struct setup_data *sd = (void *)params + efi_setup_data_offset;
	struct efi_setup_data *esd = (void *)sd + sizeof(struct setup_data);

	esd->fw_vendor = efi.fw_vendor;
	esd->runtime = efi.runtime;
	esd->tables = efi.config_table;
	esd->smbios = efi.smbios;

	sd->type = SETUP_EFI;
	sd->len = sizeof(struct efi_setup_data);

	/* Add setup data */
	setup_data_phys = params_load_addr + efi_setup_data_offset;
	sd->next = params->hdr.setup_data;
	params->hdr.setup_data = setup_data_phys;

	return 0;
}

static int
setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
		unsigned int efi_map_offset, unsigned int efi_map_sz,
		unsigned int efi_setup_data_offset)
{
	struct efi_info *current_ei = &boot_params.efi_info;
	struct efi_info *ei = &params->efi_info;

	if (!efi_enabled(EFI_RUNTIME_SERVICES))
		return 0;

	if (!current_ei->efi_memmap_size)
		return 0;

	/*
	 * If 1:1 mapping is not enabled, second kernel can not setup EFI
	 * and use EFI run time services. User space will have to pass
	 * acpi_rsdp=<addr> on kernel command line to make second kernel boot
	 * without efi.
	 */
	if (efi_enabled(EFI_OLD_MEMMAP))
		return 0;

	ei->efi_loader_signature = current_ei->efi_loader_signature;
	ei->efi_systab = current_ei->efi_systab;
	ei->efi_systab_hi = current_ei->efi_systab_hi;

	ei->efi_memdesc_version = current_ei->efi_memdesc_version;
	ei->efi_memdesc_size = efi_get_runtime_map_desc_size();

	setup_efi_info_memmap(params, params_load_addr, efi_map_offset,
			      efi_map_sz);
	prepare_add_efi_setup_data(params, params_load_addr,
				   efi_setup_data_offset);
	return 0;
}
#endif /* CONFIG_EFI */

static int
setup_boot_parameters(struct kimage *image, struct boot_params *params,
		      unsigned long params_load_addr,
		      unsigned int efi_map_offset, unsigned int efi_map_sz,
		      unsigned int efi_setup_data_offset)
{
	unsigned int nr_e820_entries;
	unsigned long long mem_k, start, end;
	int i, ret = 0;

	/* Get subarch from existing bootparams */
	params->hdr.hardware_subarch = boot_params.hdr.hardware_subarch;

	/* Copying screen_info will do? */
	memcpy(&params->screen_info, &boot_params.screen_info,
				sizeof(struct screen_info));

	/* Fill in memsize later */
	params->screen_info.ext_mem_k = 0;
	params->alt_mem_k = 0;

	/* Default APM info */
	memset(&params->apm_bios_info, 0, sizeof(params->apm_bios_info));

	/* Default drive info */
	memset(&params->hd0_info, 0, sizeof(params->hd0_info));
	memset(&params->hd1_info, 0, sizeof(params->hd1_info));

	if (image->type == KEXEC_TYPE_CRASH) {
		ret = crash_setup_memmap_entries(image, params);
		if (ret)
			return ret;
	} else
		setup_e820_entries(params);

	nr_e820_entries = params->e820_entries;

	for (i = 0; i < nr_e820_entries; i++) {
		if (params->e820_table[i].type != E820_TYPE_RAM)
			continue;
		start = params->e820_table[i].addr;
		end = params->e820_table[i].addr + params->e820_table[i].size - 1;

		if ((start <= 0x100000) && end > 0x100000) {
			mem_k = (end >> 10) - (0x100000 >> 10);
			params->screen_info.ext_mem_k = mem_k;
			params->alt_mem_k = mem_k;
			if (mem_k > 0xfc00)
				params->screen_info.ext_mem_k = 0xfc00; /* 64M*/
			if (mem_k > 0xffffffff)
				params->alt_mem_k = 0xffffffff;
		}
	}

#ifdef CONFIG_EFI
	/* Setup EFI state */
	setup_efi_state(params, params_load_addr, efi_map_offset, efi_map_sz,
			efi_setup_data_offset);
#endif

	/* Setup EDD info */
	memcpy(params->eddbuf, boot_params.eddbuf,
				EDDMAXNR * sizeof(struct edd_info));
	params->eddbuf_entries = boot_params.eddbuf_entries;

	memcpy(params->edd_mbr_sig_buffer, boot_params.edd_mbr_sig_buffer,
	       EDD_MBR_SIG_MAX * sizeof(unsigned int));

	return ret;
}

static int bzImage64_probe(const char *buf, unsigned long len)
{
	int ret = -ENOEXEC;
	struct setup_header *header;

	/* kernel should be at least two sectors long */
	if (len < 2 * 512) {
		pr_err("File is too short to be a bzImage\n");
		return ret;
	}

	header = (struct setup_header *)(buf + offsetof(struct boot_params, hdr));
	if (memcmp((char *)&header->header, "HdrS", 4) != 0) {
		pr_err("Not a bzImage\n");
		return ret;
	}

	if (header->boot_flag != 0xAA55) {
		pr_err("No x86 boot sector present\n");
		return ret;
	}

	if (header->version < 0x020C) {
		pr_err("Must be at least protocol version 2.12\n");
		return ret;
	}

	if (!(header->loadflags & LOADED_HIGH)) {
		pr_err("zImage not a bzImage\n");
		return ret;
	}

	if (!(header->xloadflags & XLF_KERNEL_64)) {
		pr_err("Not a bzImage64. XLF_KERNEL_64 is not set.\n");
		return ret;
	}

	if (!(header->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)) {
		pr_err("XLF_CAN_BE_LOADED_ABOVE_4G is not set.\n");
		return ret;
	}

	/*
	 * Can't handle 32bit EFI as it does not allow loading kernel
	 * above 4G. This should be handled by 32bit bzImage loader
	 */
	if (efi_enabled(EFI_RUNTIME_SERVICES) && !efi_enabled(EFI_64BIT)) {
		pr_debug("EFI is 32 bit. Can't load kernel above 4G.\n");
		return ret;
	}

	/* I've got a bzImage */
	pr_debug("It's a relocatable bzImage64\n");
	ret = 0;

	return ret;
}

static void *bzImage64_load(struct kimage *image, char *kernel,
			    unsigned long kernel_len, char *initrd,
			    unsigned long initrd_len, char *cmdline,
			    unsigned long cmdline_len)
{

	struct setup_header *header;
	int setup_sects, kern16_size, ret = 0;
	unsigned long setup_header_size, params_cmdline_sz;
	struct boot_params *params;
	unsigned long bootparam_load_addr, kernel_load_addr, initrd_load_addr;
	struct bzimage64_data *ldata;
	struct kexec_entry64_regs regs64;
	void *stack;
	unsigned int setup_hdr_offset = offsetof(struct boot_params, hdr);
	unsigned int efi_map_offset, efi_map_sz, efi_setup_data_offset;
	struct kexec_buf kbuf = { .image = image, .buf_max = ULONG_MAX,
				  .top_down = true };
	struct kexec_buf pbuf = { .image = image, .buf_min = MIN_PURGATORY_ADDR,
				  .buf_max = ULONG_MAX, .top_down = true };

	header = (struct setup_header *)(kernel + setup_hdr_offset);
	setup_sects = header->setup_sects;
	if (setup_sects == 0)
		setup_sects = 4;

	kern16_size = (setup_sects + 1) * 512;
	if (kernel_len < kern16_size) {
		pr_err("bzImage truncated\n");
		return ERR_PTR(-ENOEXEC);
	}

	if (cmdline_len > header->cmdline_size) {
		pr_err("Kernel command line too long\n");
		return ERR_PTR(-EINVAL);
	}

	/*
	 * In case of crash dump, we will append elfcorehdr=<addr> to
	 * command line. Make sure it does not overflow
	 */
	if (cmdline_len + MAX_ELFCOREHDR_STR_LEN > header->cmdline_size) {
		pr_debug("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
		return ERR_PTR(-EINVAL);
	}

	/* Allocate and load backup region */
	if (image->type == KEXEC_TYPE_CRASH) {
		ret = crash_load_segments(image);
		if (ret)
			return ERR_PTR(ret);
	}

	/*
	 * Load purgatory. For 64bit entry point, purgatory  code can be
	 * anywhere.
	 */
	ret = kexec_load_purgatory(image, &pbuf);
	if (ret) {
		pr_err("Loading purgatory failed\n");
		return ERR_PTR(ret);
	}

	pr_debug("Loaded purgatory at 0x%lx\n", pbuf.mem);


	/*
	 * Load Bootparams and cmdline and space for efi stuff.
	 *
	 * Allocate memory together for multiple data structures so
	 * that they all can go in single area/segment and we don't
	 * have to create separate segment for each. Keeps things
	 * little bit simple
	 */
	efi_map_sz = efi_get_runtime_map_size();
	params_cmdline_sz = sizeof(struct boot_params) + cmdline_len +
				MAX_ELFCOREHDR_STR_LEN;
	params_cmdline_sz = ALIGN(params_cmdline_sz, 16);
	kbuf.bufsz = params_cmdline_sz + ALIGN(efi_map_sz, 16) +
				sizeof(struct setup_data) +
				sizeof(struct efi_setup_data);

	params = kzalloc(kbuf.bufsz, GFP_KERNEL);
	if (!params)
		return ERR_PTR(-ENOMEM);
	efi_map_offset = params_cmdline_sz;
	efi_setup_data_offset = efi_map_offset + ALIGN(efi_map_sz, 16);

	/* Copy setup header onto bootparams. Documentation/x86/boot.txt */
	setup_header_size = 0x0202 + kernel[0x0201] - setup_hdr_offset;

	/* Is there a limit on setup header size? */
	memcpy(&params->hdr, (kernel + setup_hdr_offset), setup_header_size);

	kbuf.buffer = params;
	kbuf.memsz = kbuf.bufsz;
	kbuf.buf_align = 16;
	kbuf.buf_min = MIN_BOOTPARAM_ADDR;
	ret = kexec_add_buffer(&kbuf);
	if (ret)
		goto out_free_params;
	bootparam_load_addr = kbuf.mem;
	pr_debug("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
		 bootparam_load_addr, kbuf.bufsz, kbuf.bufsz);

	/* Load kernel */
	kbuf.buffer = kernel + kern16_size;
	kbuf.bufsz =  kernel_len - kern16_size;
	kbuf.memsz = PAGE_ALIGN(header->init_size);
	kbuf.buf_align = header->kernel_alignment;
	kbuf.buf_min = MIN_KERNEL_LOAD_ADDR;
	kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
	ret = kexec_add_buffer(&kbuf);
	if (ret)
		goto out_free_params;
	kernel_load_addr = kbuf.mem;

	pr_debug("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
		 kernel_load_addr, kbuf.bufsz, kbuf.memsz);

	/* Load initrd high */
	if (initrd) {
		kbuf.buffer = initrd;
		kbuf.bufsz = kbuf.memsz = initrd_len;
		kbuf.buf_align = PAGE_SIZE;
		kbuf.buf_min = MIN_INITRD_LOAD_ADDR;
		kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
		ret = kexec_add_buffer(&kbuf);
		if (ret)
			goto out_free_params;
		initrd_load_addr = kbuf.mem;

		pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
				initrd_load_addr, initrd_len, initrd_len);

		setup_initrd(params, initrd_load_addr, initrd_len);
	}

	setup_cmdline(image, params, bootparam_load_addr,
		      sizeof(struct boot_params), cmdline, cmdline_len);

	/* bootloader info. Do we need a separate ID for kexec kernel loader? */
	params->hdr.type_of_loader = 0x0D << 4;
	params->hdr.loadflags = 0;

	/* Setup purgatory regs for entry */
	ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", &regs64,
					     sizeof(regs64), 1);
	if (ret)
		goto out_free_params;

	regs64.rbx = 0; /* Bootstrap Processor */
	regs64.rsi = bootparam_load_addr;
	regs64.rip = kernel_load_addr + 0x200;
	stack = kexec_purgatory_get_symbol_addr(image, "stack_end");
	if (IS_ERR(stack)) {
		pr_err("Could not find address of symbol stack_end\n");
		ret = -EINVAL;
		goto out_free_params;
	}

	regs64.rsp = (unsigned long)stack;
	ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", &regs64,
					     sizeof(regs64), 0);
	if (ret)
		goto out_free_params;

	ret = setup_boot_parameters(image, params, bootparam_load_addr,
				    efi_map_offset, efi_map_sz,
				    efi_setup_data_offset);
	if (ret)
		goto out_free_params;

	/* Allocate loader specific data */
	ldata = kzalloc(sizeof(struct bzimage64_data), GFP_KERNEL);
	if (!ldata) {
		ret = -ENOMEM;
		goto out_free_params;
	}

	/*
	 * Store pointer to params so that it could be freed after loading
	 * params segment has been loaded and contents have been copied
	 * somewhere else.
	 */
	ldata->bootparams_buf = params;
	return ldata;

out_free_params:
	kfree(params);
	return ERR_PTR(ret);
}

/* This cleanup function is called after various segments have been loaded */
static int bzImage64_cleanup(void *loader_data)
{
	struct bzimage64_data *ldata = loader_data;

	if (!ldata)
		return 0;

	kfree(ldata->bootparams_buf);
	ldata->bootparams_buf = NULL;

	return 0;
}

#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
{
	return verify_pefile_signature(kernel, kernel_len,
				       VERIFY_USE_SECONDARY_KEYRING,
				       VERIFYING_KEXEC_PE_SIGNATURE);
}
#endif

const struct kexec_file_ops kexec_bzImage64_ops = {
	.probe = bzImage64_probe,
	.load = bzImage64_load,
	.cleanup = bzImage64_cleanup,
#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
	.verify_sig = bzImage64_verify_sig,
#endif
};
Commit	Line	Data
27f48d3e VG	1	/*
	2	* Kexec bzImage loader
	3	*
	4	* Copyright (C) 2014 Red Hat Inc.
	5	* Authors:
	6	* Vivek Goyal <vgoyal@redhat.com>
	7	*
	8	* This source code is licensed under the GNU General Public License,
	9	* Version 2. See the file COPYING for more details.
	10	*/
	11
	12	#define pr_fmt(fmt) "kexec-bzImage64: " fmt
	13
	14	#include <linux/string.h>
	15	#include <linux/printk.h>
	16	#include <linux/errno.h>
	17	#include <linux/slab.h>
	18	#include <linux/kexec.h>
	19	#include <linux/kernel.h>
	20	#include <linux/mm.h>
6a2c20e7	21	#include <linux/efi.h>
e68503bd	22	#include <linux/verification.h>
27f48d3e VG	23
	24	#include <asm/bootparam.h>
	25	#include <asm/setup.h>
dd5f7260	26	#include <asm/crash.h>
6a2c20e7	27	#include <asm/efi.h>
5520b7e7	28	#include <asm/e820/api.h>
f8da964d	29	#include <asm/kexec-bzimage64.h>
dd5f7260 VG	30
dd5f7260 VG	31	#define MAX_ELFCOREHDR_STR_LEN 30 /* elfcorehdr=0x<64bit-value> */
27f48d3e VG	32
	33	/*
	34	* Defines lowest physical address for various segments. Not sure where
	35	* exactly these limits came from. Current bzimage64 loader in kexec-tools
	36	* uses these so I am retaining it. It can be changed over time as we gain
	37	* more insight.
	38	*/
	39	#define MIN_PURGATORY_ADDR 0x3000
	40	#define MIN_BOOTPARAM_ADDR 0x3000
	41	#define MIN_KERNEL_LOAD_ADDR 0x100000
	42	#define MIN_INITRD_LOAD_ADDR 0x1000000
	43
	44	/*
	45	* This is a place holder for all boot loader specific data structure which
	46	* gets allocated in one call but gets freed much later during cleanup
	47	* time. Right now there is only one field but it can grow as need be.
	48	*/
	49	struct bzimage64_data {
	50	/*
	51	* Temporary buffer to hold bootparams buffer. This should be
	52	* freed once the bootparam segment has been loaded.
	53	*/
	54	void *bootparams_buf;
	55	};
	56
	57	static int setup_initrd(struct boot_params *params,
	58	unsigned long initrd_load_addr, unsigned long initrd_len)
	59	{
	60	params->hdr.ramdisk_image = initrd_load_addr & 0xffffffffUL;
	61	params->hdr.ramdisk_size = initrd_len & 0xffffffffUL;
	62
	63	params->ext_ramdisk_image = initrd_load_addr >> 32;
	64	params->ext_ramdisk_size = initrd_len >> 32;
	65
	66	return 0;
	67	}
	68
dd5f7260	69	static int setup_cmdline(struct kimage image, struct boot_params params,
27f48d3e VG	70	unsigned long bootparams_load_addr,
	71	unsigned long cmdline_offset, char *cmdline,
	72	unsigned long cmdline_len)
	73	{
	74	char cmdline_ptr = ((char )params) + cmdline_offset;
a846f479	75	unsigned long cmdline_ptr_phys, len = 0;
27f48d3e VG	76	uint32_t cmdline_low_32, cmdline_ext_32;
27f48d3e VG	77
dd5f7260	78	if (image->type == KEXEC_TYPE_CRASH) {
a846f479 KA	79	len = sprintf(cmdline_ptr,
a846f479 KA	80	"elfcorehdr=0x%lx ", image->arch.elf_load_addr);
dd5f7260	81	}
a846f479 KA	82	memcpy(cmdline_ptr + len, cmdline, cmdline_len);
	83	cmdline_len += len;
	84
27f48d3e VG	85	cmdline_ptr[cmdline_len - 1] = '\0';
27f48d3e VG	86
dd5f7260	87	pr_debug("Final command line is: %s\n", cmdline_ptr);
27f48d3e VG	88	cmdline_ptr_phys = bootparams_load_addr + cmdline_offset;
	89	cmdline_low_32 = cmdline_ptr_phys & 0xffffffffUL;
	90	cmdline_ext_32 = cmdline_ptr_phys >> 32;
	91
	92	params->hdr.cmd_line_ptr = cmdline_low_32;
	93	if (cmdline_ext_32)
	94	params->ext_cmd_line_ptr = cmdline_ext_32;
	95
	96	return 0;
	97	}
	98
6a2c20e7	99	static int setup_e820_entries(struct boot_params *params)
27f48d3e VG	100	{
	101	unsigned int nr_e820_entries;
	102
a09bae0f	103	nr_e820_entries = e820_table_kexec->nr_entries;
27f48d3e	104
08b46d5d IM	105	/* TODO: Pass entries more than E820_MAX_ENTRIES_ZEROPAGE in bootparams setup data */
	106	if (nr_e820_entries > E820_MAX_ENTRIES_ZEROPAGE)
	107	nr_e820_entries = E820_MAX_ENTRIES_ZEROPAGE;
27f48d3e VG	108
27f48d3e VG	109	params->e820_entries = nr_e820_entries;
a09bae0f	110	memcpy(&params->e820_table, &e820_table_kexec->entries, nr_e820_entries*sizeof(struct e820_entry));
27f48d3e VG	111
	112	return 0;
	113	}
	114
6a2c20e7 VG	115	#ifdef CONFIG_EFI
	116	static int setup_efi_info_memmap(struct boot_params *params,
	117	unsigned long params_load_addr,
	118	unsigned int efi_map_offset,
	119	unsigned int efi_map_sz)
	120	{
	121	void efi_map = (void )params + efi_map_offset;
	122	unsigned long efi_map_phys_addr = params_load_addr + efi_map_offset;
	123	struct efi_info *ei = &params->efi_info;
	124
	125	if (!efi_map_sz)
	126	return 0;
	127
	128	efi_runtime_map_copy(efi_map, efi_map_sz);
	129
	130	ei->efi_memmap = efi_map_phys_addr & 0xffffffff;
	131	ei->efi_memmap_hi = efi_map_phys_addr >> 32;
	132	ei->efi_memmap_size = efi_map_sz;
	133
	134	return 0;
	135	}
	136
	137	static int
	138	prepare_add_efi_setup_data(struct boot_params *params,
	139	unsigned long params_load_addr,
	140	unsigned int efi_setup_data_offset)
	141	{
	142	unsigned long setup_data_phys;
	143	struct setup_data sd = (void )params + efi_setup_data_offset;
	144	struct efi_setup_data esd = (void )sd + sizeof(struct setup_data);
	145
	146	esd->fw_vendor = efi.fw_vendor;
	147	esd->runtime = efi.runtime;
	148	esd->tables = efi.config_table;
	149	esd->smbios = efi.smbios;
	150
	151	sd->type = SETUP_EFI;
	152	sd->len = sizeof(struct efi_setup_data);
	153
	154	/* Add setup data */
	155	setup_data_phys = params_load_addr + efi_setup_data_offset;
	156	sd->next = params->hdr.setup_data;
	157	params->hdr.setup_data = setup_data_phys;
	158
	159	return 0;
	160	}
	161
	162	static int
	163	setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
	164	unsigned int efi_map_offset, unsigned int efi_map_sz,
	165	unsigned int efi_setup_data_offset)
	166	{
	167	struct efi_info *current_ei = &boot_params.efi_info;
	168	struct efi_info *ei = &params->efi_info;
	169
2aa958c9 KS	170	if (!efi_enabled(EFI_RUNTIME_SERVICES))
	171	return 0;
	172
6a2c20e7 VG	173	if (!current_ei->efi_memmap_size)
	174	return 0;
	175
	176	/*
	177	* If 1:1 mapping is not enabled, second kernel can not setup EFI
	178	* and use EFI run time services. User space will have to pass
	179	* acpi_rsdp=<addr> on kernel command line to make second kernel boot
	180	* without efi.
	181	*/
	182	if (efi_enabled(EFI_OLD_MEMMAP))
	183	return 0;
	184
	185	ei->efi_loader_signature = current_ei->efi_loader_signature;
	186	ei->efi_systab = current_ei->efi_systab;
	187	ei->efi_systab_hi = current_ei->efi_systab_hi;
	188
	189	ei->efi_memdesc_version = current_ei->efi_memdesc_version;
	190	ei->efi_memdesc_size = efi_get_runtime_map_desc_size();
	191
	192	setup_efi_info_memmap(params, params_load_addr, efi_map_offset,
	193	efi_map_sz);
	194	prepare_add_efi_setup_data(params, params_load_addr,
	195	efi_setup_data_offset);
	196	return 0;
	197	}
	198	#endif /* CONFIG_EFI */
	199
	200	static int
	201	setup_boot_parameters(struct kimage image, struct boot_params params,
	202	unsigned long params_load_addr,
	203	unsigned int efi_map_offset, unsigned int efi_map_sz,
	204	unsigned int efi_setup_data_offset)
27f48d3e VG	205	{
	206	unsigned int nr_e820_entries;
	207	unsigned long long mem_k, start, end;
dd5f7260	208	int i, ret = 0;
27f48d3e VG	209
	210	/* Get subarch from existing bootparams */
	211	params->hdr.hardware_subarch = boot_params.hdr.hardware_subarch;
	212
	213	/* Copying screen_info will do? */
	214	memcpy(&params->screen_info, &boot_params.screen_info,
	215	sizeof(struct screen_info));
	216
	217	/* Fill in memsize later */
	218	params->screen_info.ext_mem_k = 0;
	219	params->alt_mem_k = 0;
	220
	221	/* Default APM info */
	222	memset(&params->apm_bios_info, 0, sizeof(params->apm_bios_info));
	223
	224	/* Default drive info */
	225	memset(&params->hd0_info, 0, sizeof(params->hd0_info));
	226	memset(&params->hd1_info, 0, sizeof(params->hd1_info));
	227
dd5f7260 VG	228	if (image->type == KEXEC_TYPE_CRASH) {
	229	ret = crash_setup_memmap_entries(image, params);
	230	if (ret)
	231	return ret;
	232	} else
6a2c20e7	233	setup_e820_entries(params);
dd5f7260	234
27f48d3e VG	235	nr_e820_entries = params->e820_entries;
	236
	237	for (i = 0; i < nr_e820_entries; i++) {
09821ff1	238	if (params->e820_table[i].type != E820_TYPE_RAM)
27f48d3e	239	continue;
61a50101 IM	240	start = params->e820_table[i].addr;
61a50101 IM	241	end = params->e820_table[i].addr + params->e820_table[i].size - 1;
27f48d3e VG	242
	243	if ((start <= 0x100000) && end > 0x100000) {
	244	mem_k = (end >> 10) - (0x100000 >> 10);
	245	params->screen_info.ext_mem_k = mem_k;
	246	params->alt_mem_k = mem_k;
	247	if (mem_k > 0xfc00)
	248	params->screen_info.ext_mem_k = 0xfc00; /* 64M*/
	249	if (mem_k > 0xffffffff)
	250	params->alt_mem_k = 0xffffffff;
	251	}
	252	}
	253
6a2c20e7 VG	254	#ifdef CONFIG_EFI
	255	/* Setup EFI state */
	256	setup_efi_state(params, params_load_addr, efi_map_offset, efi_map_sz,
	257	efi_setup_data_offset);
	258	#endif
	259
27f48d3e VG	260	/* Setup EDD info */
	261	memcpy(params->eddbuf, boot_params.eddbuf,
	262	EDDMAXNR * sizeof(struct edd_info));
	263	params->eddbuf_entries = boot_params.eddbuf_entries;
	264
	265	memcpy(params->edd_mbr_sig_buffer, boot_params.edd_mbr_sig_buffer,
	266	EDD_MBR_SIG_MAX * sizeof(unsigned int));
	267
dd5f7260	268	return ret;
27f48d3e VG	269	}
27f48d3e VG	270
f8da964d	271	static int bzImage64_probe(const char *buf, unsigned long len)
27f48d3e VG	272	{
	273	int ret = -ENOEXEC;
	274	struct setup_header *header;
	275
6a6256f9	276	/* kernel should be at least two sectors long */
27f48d3e VG	277	if (len < 2 * 512) {
	278	pr_err("File is too short to be a bzImage\n");
	279	return ret;
	280	}
	281
	282	header = (struct setup_header *)(buf + offsetof(struct boot_params, hdr));
	283	if (memcmp((char *)&header->header, "HdrS", 4) != 0) {
	284	pr_err("Not a bzImage\n");
	285	return ret;
	286	}
	287
	288	if (header->boot_flag != 0xAA55) {
	289	pr_err("No x86 boot sector present\n");
	290	return ret;
	291	}
	292
	293	if (header->version < 0x020C) {
	294	pr_err("Must be at least protocol version 2.12\n");
	295	return ret;
	296	}
	297
	298	if (!(header->loadflags & LOADED_HIGH)) {
	299	pr_err("zImage not a bzImage\n");
	300	return ret;
	301	}
	302
	303	if (!(header->xloadflags & XLF_KERNEL_64)) {
	304	pr_err("Not a bzImage64. XLF_KERNEL_64 is not set.\n");
	305	return ret;
	306	}
	307
	308	if (!(header->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)) {
	309	pr_err("XLF_CAN_BE_LOADED_ABOVE_4G is not set.\n");
	310	return ret;
	311	}
	312
6a2c20e7 VG	313	/*
	314	* Can't handle 32bit EFI as it does not allow loading kernel
	315	* above 4G. This should be handled by 32bit bzImage loader
	316	*/
	317	if (efi_enabled(EFI_RUNTIME_SERVICES) && !efi_enabled(EFI_64BIT)) {
	318	pr_debug("EFI is 32 bit. Can't load kernel above 4G.\n");
	319	return ret;
	320	}
	321
27f48d3e VG	322	/* I've got a bzImage */
	323	pr_debug("It's a relocatable bzImage64\n");
	324	ret = 0;
	325
	326	return ret;
	327	}
	328
f8da964d VG	329	static void bzImage64_load(struct kimage image, char *kernel,
	330	unsigned long kernel_len, char *initrd,
	331	unsigned long initrd_len, char *cmdline,
	332	unsigned long cmdline_len)
27f48d3e VG	333	{
	334
	335	struct setup_header *header;
	336	int setup_sects, kern16_size, ret = 0;
ec2b9bfa	337	unsigned long setup_header_size, params_cmdline_sz;
27f48d3e VG	338	struct boot_params *params;
27f48d3e VG	339	unsigned long bootparam_load_addr, kernel_load_addr, initrd_load_addr;
27f48d3e VG	340	struct bzimage64_data *ldata;
	341	struct kexec_entry64_regs regs64;
	342	void *stack;
	343	unsigned int setup_hdr_offset = offsetof(struct boot_params, hdr);
6a2c20e7	344	unsigned int efi_map_offset, efi_map_sz, efi_setup_data_offset;
ec2b9bfa TJB	345	struct kexec_buf kbuf = { .image = image, .buf_max = ULONG_MAX,
ec2b9bfa TJB	346	.top_down = true };
3be3f61d PR	347	struct kexec_buf pbuf = { .image = image, .buf_min = MIN_PURGATORY_ADDR,
3be3f61d PR	348	.buf_max = ULONG_MAX, .top_down = true };
27f48d3e VG	349
	350	header = (struct setup_header *)(kernel + setup_hdr_offset);
	351	setup_sects = header->setup_sects;
	352	if (setup_sects == 0)
	353	setup_sects = 4;
	354
	355	kern16_size = (setup_sects + 1) * 512;
	356	if (kernel_len < kern16_size) {
	357	pr_err("bzImage truncated\n");
	358	return ERR_PTR(-ENOEXEC);
	359	}
	360
	361	if (cmdline_len > header->cmdline_size) {
	362	pr_err("Kernel command line too long\n");
	363	return ERR_PTR(-EINVAL);
	364	}
	365
dd5f7260 VG	366	/*
	367	* In case of crash dump, we will append elfcorehdr=<addr> to
	368	* command line. Make sure it does not overflow
	369	*/
	370	if (cmdline_len + MAX_ELFCOREHDR_STR_LEN > header->cmdline_size) {
	371	pr_debug("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
	372	return ERR_PTR(-EINVAL);
	373	}
	374
	375	/* Allocate and load backup region */
	376	if (image->type == KEXEC_TYPE_CRASH) {
	377	ret = crash_load_segments(image);
	378	if (ret)
	379	return ERR_PTR(ret);
	380	}
	381
27f48d3e VG	382	/*
	383	* Load purgatory. For 64bit entry point, purgatory code can be
	384	* anywhere.
	385	*/
3be3f61d	386	ret = kexec_load_purgatory(image, &pbuf);
27f48d3e VG	387	if (ret) {
	388	pr_err("Loading purgatory failed\n");
	389	return ERR_PTR(ret);
	390	}
	391
3be3f61d	392	pr_debug("Loaded purgatory at 0x%lx\n", pbuf.mem);
27f48d3e	393
6a2c20e7 VG	394
	395	/*
	396	* Load Bootparams and cmdline and space for efi stuff.
	397	*
	398	* Allocate memory together for multiple data structures so
	399	* that they all can go in single area/segment and we don't
	400	* have to create separate segment for each. Keeps things
	401	* little bit simple
	402	*/
	403	efi_map_sz = efi_get_runtime_map_size();
dd5f7260 VG	404	params_cmdline_sz = sizeof(struct boot_params) + cmdline_len +
dd5f7260 VG	405	MAX_ELFCOREHDR_STR_LEN;
6a2c20e7	406	params_cmdline_sz = ALIGN(params_cmdline_sz, 16);
a841aa83	407	kbuf.bufsz = params_cmdline_sz + ALIGN(efi_map_sz, 16) +
6a2c20e7 VG	408	sizeof(struct setup_data) +
	409	sizeof(struct efi_setup_data);
	410
ec2b9bfa	411	params = kzalloc(kbuf.bufsz, GFP_KERNEL);
27f48d3e VG	412	if (!params)
27f48d3e VG	413	return ERR_PTR(-ENOMEM);
6a2c20e7	414	efi_map_offset = params_cmdline_sz;
a841aa83	415	efi_setup_data_offset = efi_map_offset + ALIGN(efi_map_sz, 16);
27f48d3e VG	416
	417	/* Copy setup header onto bootparams. Documentation/x86/boot.txt */
	418	setup_header_size = 0x0202 + kernel[0x0201] - setup_hdr_offset;
	419
	420	/* Is there a limit on setup header size? */
	421	memcpy(&params->hdr, (kernel + setup_hdr_offset), setup_header_size);
	422
ec2b9bfa TJB	423	kbuf.buffer = params;
	424	kbuf.memsz = kbuf.bufsz;
	425	kbuf.buf_align = 16;
	426	kbuf.buf_min = MIN_BOOTPARAM_ADDR;
	427	ret = kexec_add_buffer(&kbuf);
27f48d3e VG	428	if (ret)
27f48d3e VG	429	goto out_free_params;
ec2b9bfa	430	bootparam_load_addr = kbuf.mem;
6a2c20e7	431	pr_debug("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
ec2b9bfa	432	bootparam_load_addr, kbuf.bufsz, kbuf.bufsz);
27f48d3e VG	433
27f48d3e VG	434	/* Load kernel */
ec2b9bfa TJB	435	kbuf.buffer = kernel + kern16_size;
	436	kbuf.bufsz = kernel_len - kern16_size;
	437	kbuf.memsz = PAGE_ALIGN(header->init_size);
	438	kbuf.buf_align = header->kernel_alignment;
	439	kbuf.buf_min = MIN_KERNEL_LOAD_ADDR;
993a1103	440	kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
ec2b9bfa	441	ret = kexec_add_buffer(&kbuf);
27f48d3e VG	442	if (ret)
27f48d3e VG	443	goto out_free_params;
ec2b9bfa	444	kernel_load_addr = kbuf.mem;
27f48d3e VG	445
27f48d3e VG	446	pr_debug("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
ec2b9bfa	447	kernel_load_addr, kbuf.bufsz, kbuf.memsz);
27f48d3e VG	448
	449	/* Load initrd high */
	450	if (initrd) {
ec2b9bfa TJB	451	kbuf.buffer = initrd;
	452	kbuf.bufsz = kbuf.memsz = initrd_len;
	453	kbuf.buf_align = PAGE_SIZE;
	454	kbuf.buf_min = MIN_INITRD_LOAD_ADDR;
993a1103	455	kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
ec2b9bfa	456	ret = kexec_add_buffer(&kbuf);
27f48d3e VG	457	if (ret)
27f48d3e VG	458	goto out_free_params;
ec2b9bfa	459	initrd_load_addr = kbuf.mem;
27f48d3e VG	460
	461	pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
	462	initrd_load_addr, initrd_len, initrd_len);
	463
	464	setup_initrd(params, initrd_load_addr, initrd_len);
	465	}
	466
dd5f7260 VG	467	setup_cmdline(image, params, bootparam_load_addr,
dd5f7260 VG	468	sizeof(struct boot_params), cmdline, cmdline_len);
27f48d3e VG	469
	470	/* bootloader info. Do we need a separate ID for kexec kernel loader? */
	471	params->hdr.type_of_loader = 0x0D << 4;
	472	params->hdr.loadflags = 0;
	473
	474	/* Setup purgatory regs for entry */
	475	ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", &regs64,
	476	sizeof(regs64), 1);
	477	if (ret)
	478	goto out_free_params;
	479
	480	regs64.rbx = 0; /* Bootstrap Processor */
	481	regs64.rsi = bootparam_load_addr;
	482	regs64.rip = kernel_load_addr + 0x200;
	483	stack = kexec_purgatory_get_symbol_addr(image, "stack_end");
	484	if (IS_ERR(stack)) {
	485	pr_err("Could not find address of symbol stack_end\n");
	486	ret = -EINVAL;
	487	goto out_free_params;
	488	}
	489
	490	regs64.rsp = (unsigned long)stack;
	491	ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", &regs64,
	492	sizeof(regs64), 0);
	493	if (ret)
	494	goto out_free_params;
	495
6a2c20e7 VG	496	ret = setup_boot_parameters(image, params, bootparam_load_addr,
	497	efi_map_offset, efi_map_sz,
	498	efi_setup_data_offset);
dd5f7260 VG	499	if (ret)
dd5f7260 VG	500	goto out_free_params;
27f48d3e VG	501
	502	/* Allocate loader specific data */
	503	ldata = kzalloc(sizeof(struct bzimage64_data), GFP_KERNEL);
	504	if (!ldata) {
	505	ret = -ENOMEM;
	506	goto out_free_params;
	507	}
	508
	509	/*
	510	* Store pointer to params so that it could be freed after loading
	511	* params segment has been loaded and contents have been copied
	512	* somewhere else.
	513	*/
	514	ldata->bootparams_buf = params;
	515	return ldata;
	516
	517	out_free_params:
	518	kfree(params);
	519	return ERR_PTR(ret);
	520	}
	521
	522	/* This cleanup function is called after various segments have been loaded */
f8da964d	523	static int bzImage64_cleanup(void *loader_data)
27f48d3e VG	524	{
	525	struct bzimage64_data *ldata = loader_data;
	526
	527	if (!ldata)
	528	return 0;
	529
	530	kfree(ldata->bootparams_buf);
	531	ldata->bootparams_buf = NULL;
	532
	533	return 0;
	534	}
	535
8e7d8381	536	#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
f8da964d	537	static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
8e7d8381	538	{
e68503bd	539	return verify_pefile_signature(kernel, kernel_len,
ea93102f	540	VERIFY_USE_SECONDARY_KEYRING,
e68503bd	541	VERIFYING_KEXEC_PE_SIGNATURE);
8e7d8381 VG	542	}
	543	#endif
	544
9ec4ecef	545	const struct kexec_file_ops kexec_bzImage64_ops = {
27f48d3e VG	546	.probe = bzImage64_probe,
	547	.load = bzImage64_load,
	548	.cleanup = bzImage64_cleanup,
8e7d8381 VG	549	#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
	550	.verify_sig = bzImage64_verify_sig,
	551	#endif
27f48d3e	552	};