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// SPDX-License-Identifier: GPL-2.0-only
/*
* Kexec bzImage loader
*
* Copyright (C) 2014 Red Hat Inc.
* Authors:
* Vivek Goyal <vgoyal@redhat.com>
*/
#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(¶ms->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 = ¶ms->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->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 = ¶ms->efi_info;
if (!efi_enabled(EFI_RUNTIME_SERVICES))
return 0;
if (!current_ei->efi_memmap_size)
return 0;
params->secure_boot = boot_params.secure_boot;
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(¶ms->screen_info, &screen_info, sizeof(struct screen_info));
/* Fill in memsize later */
params->screen_info.ext_mem_k = 0;
params->alt_mem_k = 0;
/* Always fill in RSDP: it is either 0 or a valid value */
params->acpi_rsdp_addr = boot_params.acpi_rsdp_addr;
/* Default APM info */
memset(¶ms->apm_bios_info, 0, sizeof(params->apm_bios_info));
/* Default drive info */
memset(¶ms->hd0_info, 0, sizeof(params->hd0_info));
memset(¶ms->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[
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