arch/arm/kernel/relocate_kernel.S

   1 /*
   2  * relocate_kernel.S - put the kernel image in place to boot
   3  */
   4
   5 #include <asm/kexec.h>
   6
   7         .globl relocate_new_kernel
   8 relocate_new_kernel:
   9
  10         ldr     r0,kexec_indirection_page
  11         ldr     r1,kexec_start_address
  12
  13         /*
  14          * If there is no indirection page (we are doing crashdumps)
  15          * skip any relocation.
  16          */
  17         cmp     r0, #0
  18         beq     2f
  19
  20 0:      /* top, read another word for the indirection page */
  21         ldr     r3, [r0],#4
  22
  23         /* Is it a destination page. Put destination address to r4 */
  24         tst     r3,#1,0
  25         beq     1f
  26         bic     r4,r3,#1
  27         b       0b
  28 1:
  29         /* Is it an indirection page */
  30         tst     r3,#2,0
  31         beq     1f
  32         bic     r0,r3,#2
  33         b       0b
  34 1:
  35
  36         /* are we done ? */
  37         tst     r3,#4,0
  38         beq     1f
  39         b       2f
  40
  41 1:
  42         /* is it source ? */
  43         tst     r3,#8,0
  44         beq     0b
  45         bic r3,r3,#8
  46         mov r6,#1024
  47 9:
  48         ldr r5,[r3],#4
  49         str r5,[r4],#4
  50         subs r6,r6,#1
  51         bne 9b
  52         b 0b
  53
  54 2:
  55         /* Jump to relocated kernel */
  56         mov lr,r1
  57         mov r0,#0
  58         ldr r1,kexec_mach_type
  59         ldr r2,kexec_boot_atags
  60  ARM(   mov pc, lr      )
  61  THUMB( bx lr           )
  62
  63         .align
  64
  65         .globl kexec_start_address
  66 kexec_start_address:
  67         .long   0x0
  68
  69         .globl kexec_indirection_page
  70 kexec_indirection_page:
  71         .long   0x0
  72
  73         .globl kexec_mach_type
  74 kexec_mach_type:
  75         .long   0x0
  76
  77         /* phy addr of the atags for the new kernel */
  78         .globl kexec_boot_atags
  79 kexec_boot_atags:
  80         .long   0x0
  81
  82 relocate_new_kernel_end:
  83
  84         .globl relocate_new_kernel_size
  85 relocate_new_kernel_size:
  86         .long relocate_new_kernel_end - relocate_new_kernel
  87
  88