relocate_kernel64.S 3.0 KB

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  1. /*
  2. * arch/s390/kernel/relocate_kernel64.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. *
  21. * 0xf000 is a page_mask
  22. */
  23. .text
  24. .globl relocate_kernel
  25. relocate_kernel:
  26. basr %r13,0 # base address
  27. .base:
  28. stnsm sys_msk-.base(%r13),0xfb # disable DAT
  29. stctg %c0,%c15,ctlregs-.base(%r13)
  30. stmg %r0,%r15,gprregs-.base(%r13)
  31. lghi %r0,3
  32. sllg %r0,%r0,31
  33. stg %r0,0x1d0(%r0)
  34. la %r0,.back_pgm-.base(%r13)
  35. stg %r0,0x1d8(%r0)
  36. la %r1,load_psw-.base(%r13)
  37. mvc 0(8,%r0),0(%r1)
  38. la %r0,.back-.base(%r13)
  39. st %r0,4(%r0)
  40. oi 4(%r0),0x80
  41. lghi %r0,0
  42. diag %r0,%r0,0x308
  43. .back:
  44. lhi %r1,1 # mode 1 = esame
  45. sigp %r1,%r0,0x12 # switch to esame mode
  46. sam64 # switch to 64 bit addressing mode
  47. basr %r13,0
  48. .back_base:
  49. oi have_diag308-.back_base(%r13),0x01
  50. lctlg %c0,%c15,ctlregs-.back_base(%r13)
  51. lmg %r0,%r15,gprregs-.back_base(%r13)
  52. j .top
  53. .back_pgm:
  54. lmg %r0,%r15,gprregs-.base(%r13)
  55. .top:
  56. lghi %r7,4096 # load PAGE_SIZE in r7
  57. lghi %r9,4096 # load PAGE_SIZE in r9
  58. lg %r5,0(%r2) # read another word for indirection page
  59. aghi %r2,8 # increment pointer
  60. tml %r5,0x1 # is it a destination page?
  61. je .indir_check # NO, goto "indir_check"
  62. lgr %r6,%r5 # r6 = r5
  63. nill %r6,0xf000 # mask it out and...
  64. j .top # ...next iteration
  65. .indir_check:
  66. tml %r5,0x2 # is it a indirection page?
  67. je .done_test # NO, goto "done_test"
  68. nill %r5,0xf000 # YES, mask out,
  69. lgr %r2,%r5 # move it into the right register,
  70. j .top # and read next...
  71. .done_test:
  72. tml %r5,0x4 # is it the done indicator?
  73. je .source_test # NO! Well, then it should be the source indicator...
  74. j .done # ok, lets finish it here...
  75. .source_test:
  76. tml %r5,0x8 # it should be a source indicator...
  77. je .top # NO, ignore it...
  78. lgr %r8,%r5 # r8 = r5
  79. nill %r8,0xf000 # masking
  80. 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
  81. jo 0b
  82. j .top
  83. .done:
  84. sgr %r0,%r0 # clear register r0
  85. la %r4,load_psw-.base(%r13) # load psw-address into the register
  86. o %r3,4(%r4) # or load address into psw
  87. st %r3,4(%r4)
  88. mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
  89. tm have_diag308-.base(%r13),0x01
  90. jno .no_diag308
  91. diag %r0,%r0,0x308
  92. .no_diag308:
  93. sam31 # 31 bit mode
  94. sr %r1,%r1 # erase register r1
  95. sr %r2,%r2 # erase register r2
  96. sigp %r1,%r2,0x12 # set cpuid to zero
  97. lpsw 0 # hopefully start new kernel...
  98. .align 8
  99. load_psw:
  100. .long 0x00080000,0x80000000
  101. sys_msk:
  102. .quad 0
  103. ctlregs:
  104. .rept 16
  105. .quad 0
  106. .endr
  107. gprregs:
  108. .rept 16
  109. .quad 0
  110. .endr
  111. have_diag308:
  112. .byte 0
  113. .align 8
  114. relocate_kernel_end:
  115. .globl relocate_kernel_len
  116. relocate_kernel_len:
  117. .quad relocate_kernel_end - relocate_kernel