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 0:      /* top, read another word for the indirection page */
  15         ldr     r3, [r0],#4
  16
  17         /* Is it a destination page. Put destination address to r4 */
  18         tst     r3,#1,0
  19         beq     1f
  20         bic     r4,r3,#1
  21         b       0b
  22 1:
  23         /* Is it an indirection page */
  24         tst     r3,#2,0
  25         beq     1f
  26         bic     r0,r3,#2
  27         b       0b
  28 1:
  29
  30         /* are we done ? */
  31         tst     r3,#4,0
  32         beq     1f
  33         b       2f
  34
  35 1:
  36         /* is it source ? */
  37         tst     r3,#8,0
  38         beq     0b
  39         bic r3,r3,#8
  40         mov r6,#1024
  41 9:
  42         ldr r5,[r3],#4
  43         str r5,[r4],#4
  44         subs r6,r6,#1
  45         bne 9b
  46         b 0b
  47
  48 2:
  49         /* Jump to relocated kernel */
  50         mov lr,r1
  51         mov r0,#0
  52         ldr r1,kexec_mach_type
  53         ldr r2,kexec_boot_atags
  54         mov pc,lr
  55
  56         .globl kexec_start_address
  57 kexec_start_address:
  58         .long   0x0
  59
  60         .globl kexec_indirection_page
  61 kexec_indirection_page:
  62         .long   0x0
  63
  64         .globl kexec_mach_type
  65 kexec_mach_type:
  66         .long   0x0
  67
  68         /* phy addr of the atags for the new kernel */
  69         .globl kexec_boot_atags
  70 kexec_boot_atags:
  71         .long   0x0
  72
  73 relocate_new_kernel_end:
  74
  75         .globl relocate_new_kernel_size
  76 relocate_new_kernel_size:
  77         .long relocate_new_kernel_end - relocate_new_kernel
  78
  79