relocate_kernel.S 2.9 KB

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  1. /*
  2. * arch/s390/kernel/relocate_kernel.S
  3. *
  4. * (C) Copyright IBM Corp. 2005
  5. *
  6. * Author(s): Rolf Adelsberger,
  7. * Heiko Carstens <heiko.carstens@de.ibm.com>
  8. *
  9. */
  10. /*
  11. * moves the new kernel to its destination...
  12. * %r2 = pointer to first kimage_entry_t
  13. * %r3 = start address - where to jump to after the job is done...
  14. *
  15. * %r5 will be used as temp. storage
  16. * %r6 holds the destination address
  17. * %r7 = PAGE_SIZE
  18. * %r8 holds the source address
  19. * %r9 = PAGE_SIZE
  20. * %r10 is a page mask
  21. */
  22. .text
  23. .globl relocate_kernel
  24. relocate_kernel:
  25. basr %r13,0 # base address
  26. .base:
  27. stnsm sys_msk-.base(%r13),0xfb # disable DAT
  28. stctl %c0,%c15,ctlregs-.base(%r13)
  29. stm %r0,%r15,gprregs-.base(%r13)
  30. la %r1,load_psw-.base(%r13)
  31. mvc 0(8,%r0),0(%r1)
  32. la %r0,.back-.base(%r13)
  33. st %r0,4(%r0)
  34. oi 4(%r0),0x80
  35. mvc 0x68(8,%r0),0(%r1)
  36. la %r0,.back_pgm-.base(%r13)
  37. st %r0,0x6c(%r0)
  38. oi 0x6c(%r0),0x80
  39. lhi %r0,0
  40. diag %r0,%r0,0x308
  41. .back:
  42. basr %r13,0
  43. .back_base:
  44. oi have_diag308-.back_base(%r13),0x01
  45. lctl %c0,%c15,ctlregs-.back_base(%r13)
  46. lm %r0,%r15,gprregs-.back_base(%r13)
  47. j .start_reloc
  48. .back_pgm:
  49. lm %r0,%r15,gprregs-.base(%r13)
  50. .start_reloc:
  51. lhi %r10,-1 # preparing the mask
  52. sll %r10,12 # shift it such that it becomes 0xf000
  53. .top:
  54. lhi %r7,4096 # load PAGE_SIZE in r7
  55. lhi %r9,4096 # load PAGE_SIZE in r9
  56. l %r5,0(%r2) # read another word for indirection page
  57. ahi %r2,4 # increment pointer
  58. tml %r5,0x1 # is it a destination page?
  59. je .indir_check # NO, goto "indir_check"
  60. lr %r6,%r5 # r6 = r5
  61. nr %r6,%r10 # mask it out and...
  62. j .top # ...next iteration
  63. .indir_check:
  64. tml %r5,0x2 # is it a indirection page?
  65. je .done_test # NO, goto "done_test"
  66. nr %r5,%r10 # YES, mask out,
  67. lr %r2,%r5 # move it into the right register,
  68. j .top # and read next...
  69. .done_test:
  70. tml %r5,0x4 # is it the done indicator?
  71. je .source_test # NO! Well, then it should be the source indicator...
  72. j .done # ok, lets finish it here...
  73. .source_test:
  74. tml %r5,0x8 # it should be a source indicator...
  75. je .top # NO, ignore it...
  76. lr %r8,%r5 # r8 = r5
  77. nr %r8,%r10 # masking
  78. 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
  79. jo 0b
  80. j .top
  81. .done:
  82. sr %r0,%r0 # clear register r0
  83. la %r4,load_psw-.base(%r13) # load psw-address into the register
  84. o %r3,4(%r4) # or load address into psw
  85. st %r3,4(%r4)
  86. mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
  87. tm have_diag308-.base(%r13),0x01
  88. jno .no_diag308
  89. diag %r0,%r0,0x308
  90. .no_diag308:
  91. sr %r1,%r1 # clear %r1
  92. sr %r2,%r2 # clear %r2
  93. sigp %r1,%r2,0x12 # set cpuid to zero
  94. lpsw 0 # hopefully start new kernel...
  95. .align 8
  96. load_psw:
  97. .long 0x00080000,0x80000000
  98. sys_msk:
  99. .quad 0
  100. ctlregs:
  101. .rept 16
  102. .long 0
  103. .endr
  104. gprregs:
  105. .rept 16
  106. .long 0
  107. .endr
  108. have_diag308:
  109. .byte 0
  110. .align 8
  111. relocate_kernel_end:
  112. .globl relocate_kernel_len
  113. relocate_kernel_len:
  114. .quad relocate_kernel_end - relocate_kernel