arch/s390/boot/startup.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/string.h>
   3 #include <asm/setup.h>
   4 #include <asm/sclp.h>
   5 #include "compressed/decompressor.h"
   6 #include "boot.h"
   7
   8 extern char __boot_data_start[], __boot_data_end[];
   9
  10 void error(char *x)
  11 {
  12         sclp_early_printk("\n\n");
  13         sclp_early_printk(x);
  14         sclp_early_printk("\n\n -- System halted");
  15
  16         disabled_wait(0xdeadbeef);
  17 }
  18
  19 #ifdef CONFIG_KERNEL_UNCOMPRESSED
  20 unsigned long mem_safe_offset(void)
  21 {
  22         return vmlinux.default_lma + vmlinux.image_size + vmlinux.bss_size;
  23 }
  24 #endif
  25
  26 static void rescue_initrd(void)
  27 {
  28         unsigned long min_initrd_addr;
  29
  30         if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD))
  31                 return;
  32         if (!INITRD_START || !INITRD_SIZE)
  33                 return;
  34         min_initrd_addr = mem_safe_offset();
  35         if (min_initrd_addr <= INITRD_START)
  36                 return;
  37         memmove((void *)min_initrd_addr, (void *)INITRD_START, INITRD_SIZE);
  38         INITRD_START = min_initrd_addr;
  39 }
  40
  41 static void copy_bootdata(void)
  42 {
  43         if (__boot_data_end - __boot_data_start != vmlinux.bootdata_size)
  44                 error(".boot.data section size mismatch");
  45         memcpy((void *)vmlinux.bootdata_off, __boot_data_start, vmlinux.bootdata_size);
  46 }
  47
  48 void startup_kernel(void)
  49 {
  50         void *img;
  51
  52         rescue_initrd();
  53         sclp_early_read_info();
  54         store_ipl_parmblock();
  55         setup_boot_command_line();
  56         setup_memory_end();
  57         detect_memory();
  58         if (!IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) {
  59                 img = decompress_kernel();
  60                 memmove((void *)vmlinux.default_lma, img, vmlinux.image_size);
  61         }
  62         copy_bootdata();
  63         vmlinux.entry();
  64 }