LXR linux/arch/mips/kernel/relocate

   1/*
   2 * relocate_kernel.S for kexec
   3 * Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006
   4 *
   5 * This source code is licensed under the GNU General Public License,
   6 * Version 2.  See the file COPYING for more details.
   7 */
   8
   9#include <asm/asm.h>
  10#include <asm/asmmacro.h>
  11#include <asm/regdef.h>
  12#include <asm/page.h>
  13#include <asm/mipsregs.h>
  14#include <asm/stackframe.h>
  15#include <asm/addrspace.h>
  16
  17LEAF(relocate_new_kernel)
  18        PTR_L           s0, kexec_indirection_page
  19        PTR_L           s1, kexec_start_address
  20
  21process_entry:
  22        PTR_L           s2, (s0)
  23        PTR_ADD         s0, s0, SZREG
  24
  25        /* destination page */
  26        and             s3, s2, 0x1
  27        beq             s3, zero, 1f
  28        and             s4, s2, ~0x1    /* store destination addr in s4 */
  29        move            a0, s4
  30        b               process_entry
  31
  321:
  33        /* indirection page, update s0  */
  34        and             s3, s2, 0x2
  35        beq             s3, zero, 1f
  36        and             s0, s2, ~0x2
  37        b               process_entry
  38
  391:
  40        /* done page */
  41        and             s3, s2, 0x4
  42        beq             s3, zero, 1f
  43        b               done
  441:
  45        /* source page */
  46        and             s3, s2, 0x8
  47        beq             s3, zero, process_entry
  48        and             s2, s2, ~0x8
  49        li              s6, (1 << PAGE_SHIFT) / SZREG
  50
  51copy_word:
  52        /* copy page word by word */
  53        REG_L           s5, (s2)
  54        REG_S           s5, (s4)
  55        PTR_ADD         s4, s4, SZREG
  56        PTR_ADD         s2, s2, SZREG
  57        LONG_SUB        s6, s6, 1
  58        beq             s6, zero, process_entry
  59        b               copy_word
  60        b               process_entry
  61
  62done:
  63        /* jump to kexec_start_address */
  64        j               s1
  65        END(relocate_new_kernel)
  66
  67kexec_start_address:
  68        EXPORT(kexec_start_address)
  69        PTR             0x0
  70        .size           kexec_start_address, PTRSIZE
  71
  72kexec_indirection_page:
  73        EXPORT(kexec_indirection_page)
  74        PTR             0
  75        .size           kexec_indirection_page, PTRSIZE
  76
  77relocate_new_kernel_end:
  78
  79relocate_new_kernel_size:
  80        EXPORT(relocate_new_kernel_size)
  81        PTR             relocate_new_kernel_end - relocate_new_kernel
  82        .size           relocate_new_kernel_size, PTRSIZE
  83