LXR linux/arch/arm/kernel/relocate

   1/*
   2 * relocate_kernel.S - put the kernel image in place to boot
   3 */
   4
   5#include <linux/linkage.h>
   6#include <asm/assembler.h>
   7#include <asm/kexec.h>
   8
   9        .align  3       /* not needed for this code, but keeps fncpy() happy */
  10
  11ENTRY(relocate_new_kernel)
  12
  13        ldr     r0,kexec_indirection_page
  14        ldr     r1,kexec_start_address
  15
  16        /*
  17         * If there is no indirection page (we are doing crashdumps)
  18         * skip any relocation.
  19         */
  20        cmp     r0, #0
  21        beq     2f
  22
  230:      /* top, read another word for the indirection page */
  24        ldr     r3, [r0],#4
  25
  26        /* Is it a destination page. Put destination address to r4 */
  27        tst     r3,#1,0
  28        beq     1f
  29        bic     r4,r3,#1
  30        b       0b
  311:
  32        /* Is it an indirection page */
  33        tst     r3,#2,0
  34        beq     1f
  35        bic     r0,r3,#2
  36        b       0b
  371:
  38
  39        /* are we done ? */
  40        tst     r3,#4,0
  41        beq     1f
  42        b       2f
  43
  441:
  45        /* is it source ? */
  46        tst     r3,#8,0
  47        beq     0b
  48        bic r3,r3,#8
  49        mov r6,#1024
  509:
  51        ldr r5,[r3],#4
  52        str r5,[r4],#4
  53        subs r6,r6,#1
  54        bne 9b
  55        b 0b
  56
  572:
  58        /* Jump to relocated kernel */
  59        mov lr,r1
  60        mov r0,#0
  61        ldr r1,kexec_mach_type
  62        ldr r2,kexec_boot_atags
  63 ARM(   ret lr  )
  64 THUMB( bx lr           )
  65
  66        .align
  67
  68        .globl kexec_start_address
  69kexec_start_address:
  70        .long   0x0
  71
  72        .globl kexec_indirection_page
  73kexec_indirection_page:
  74        .long   0x0
  75
  76        .globl kexec_mach_type
  77kexec_mach_type:
  78        .long   0x0
  79
  80        /* phy addr of the atags for the new kernel */
  81        .globl kexec_boot_atags
  82kexec_boot_atags:
  83        .long   0x0
  84
  85ENDPROC(relocate_new_kernel)
  86
  87relocate_new_kernel_end:
  88
  89        .globl relocate_new_kernel_size
  90relocate_new_kernel_size:
  91        .long relocate_new_kernel_end - relocate_new_kernel
  92
  93
  94