| 1 | /* SPDX-License-Identifier: GPL-2.0 */
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| 10 |
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| 11 | .level PA_ASM_LEVEL
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| 12 |
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| 13 | .macro kexec_param name
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| 14 | .align 8
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| 15 | ENTRY(kexec\()_\name)
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| 16 | |
| 17 | .dword 0
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| 18 | |
| 19 | .word 0
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| 20 | |
| 21 |
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| 22 | ENTRY(kexec\()_\name\()_offset)
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| 23 | .word kexec\()_\name - relocate_new_kernel
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| 24 | .endm
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| 25 |
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| 26 | .text
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| 27 |
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| 28 | /* args:
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| 29 | * r26 - kimage->head
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| 30 | * r25 - start address of kernel
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| 31 | * r24 - physical address of relocate code
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| 32 | */
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| 33 |
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| 34 | ENTRY_CFI(relocate_new_kernel)
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| 35 | 0: copy %arg1, %rp
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| 36 | /* disable I and Q bit, so we are allowed to execute RFI */
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| 37 | rsm PSW_SM_I, %r0
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| 38 | nop
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| 39 | nop
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| 40 | nop
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| 41 | nop
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| 42 | nop
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| 43 | nop
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| 44 | nop
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| 45 |
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| 46 | rsm PSW_SM_Q, %r0
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| 47 | nop
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| 48 | nop
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| 49 | nop
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| 50 | nop
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| 51 | nop
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| 52 | nop
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| 53 | nop
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| 54 |
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| 55 | /*
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| 56 | * After return-from-interrupt, we want to run without Code/Data
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| 57 | * translation enabled just like on a normal boot.
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| 58 | */
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| 59 |
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| 60 | /* calculate new physical execution address */
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| 61 | ldo 1f-0b(%arg2), %r1
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| 62 | mtctl %r0, %cr17 /* IIASQ */
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| 63 | mtctl %r0, %cr17 /* IIASQ */
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| 64 | mtctl %r1, %cr18 /* IIAOQ */
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| 65 | ldo 4(%r1),%r1
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| 66 | mtctl %r1, %cr18 /* IIAOQ */
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| 67 | |
| 68 | depdi,z 1, PSW_W_BIT, 1, %r1
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| 69 | mtctl %r1, %cr22 /* IPSW */
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| 70 | |
| 71 | mtctl %r0, %cr22 /* IPSW */
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| 72 | |
| 73 | /* lets go... */
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| 74 | rfi
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| 75 | 1: nop
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| 76 | nop
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| 77 |
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| 78 | .Lloop:
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| 79 | LDREG,ma REG_SZ(%arg0), %r3
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| 80 | /* If crash kernel, no copy needed */
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| 81 | cmpib,COND(=),n 0,%r3,boot
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| 82 |
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| 83 | bb,<,n %r3, 31 - IND_DONE_BIT, boot
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| 84 | bb,>=,n %r3, 31 - IND_INDIRECTION_BIT, .Lnotind
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| 85 | /* indirection, load and restart */
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| 86 | movb %r3, %arg0, .Lloop
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| 87 | depi 0, 31, PAGE_SHIFT, %arg0
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| 88 |
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| 89 | .Lnotind:
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| 90 | bb,>=,n %r3, 31 - IND_DESTINATION_BIT, .Lnotdest
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| 91 | b .Lloop
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| 92 | copy %r3, %r20
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| 93 |
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| 94 | .Lnotdest:
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| 95 | bb,>= %r3, 31 - IND_SOURCE_BIT, .Lloop
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| 96 | depi 0, 31, PAGE_SHIFT, %r3
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| 97 | copy %r3, %r21
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| 98 |
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| 99 | /* copy page */
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| 100 | copy %r0, %r18
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| 101 | zdepi 1, 31 - PAGE_SHIFT, 1, %r18
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| 102 | add %r20, %r18, %r17
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| 103 |
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| 104 | depi 0, 31, PAGE_SHIFT, %r20
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| 105 | .Lcopy:
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| 106 | copy %r20, %r12
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| 107 | LDREG,ma REG_SZ(%r21), %r8
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| 108 | LDREG,ma REG_SZ(%r21), %r9
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| 109 | LDREG,ma REG_SZ(%r21), %r10
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| 110 | LDREG,ma REG_SZ(%r21), %r11
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| 111 | STREG,ma %r8, REG_SZ(%r20)
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| 112 | STREG,ma %r9, REG_SZ(%r20)
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| 113 | STREG,ma %r10, REG_SZ(%r20)
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| 114 | STREG,ma %r11, REG_SZ(%r20)
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| 115 |
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| 116 | |
| 117 | LDREG,ma REG_SZ(%r21), %r8
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| 118 | LDREG,ma REG_SZ(%r21), %r9
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| 119 | LDREG,ma REG_SZ(%r21), %r10
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| 120 | LDREG,ma REG_SZ(%r21), %r11
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| 121 | STREG,ma %r8, REG_SZ(%r20)
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| 122 | STREG,ma %r9, REG_SZ(%r20)
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| 123 | STREG,ma %r10, REG_SZ(%r20)
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| 124 | STREG,ma %r11, REG_SZ(%r20)
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| 125 | |
| 126 |
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| 127 | fdc %r0(%r12)
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| 128 | cmpb,COND(<<) %r20,%r17,.Lcopy
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| 129 | fic (%sr4, %r12)
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| 130 | b,n .Lloop
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| 131 |
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| 132 | boot:
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| 133 | mtctl %r0, %cr15
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| 134 |
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| 135 | LDREG kexec_free_mem-0b(%arg2), %arg0
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| 136 | LDREG kexec_cmdline-0b(%arg2), %arg1
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| 137 | LDREG kexec_initrd_end-0b(%arg2), %arg3
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| 138 | LDREG kexec_initrd_start-0b(%arg2), %arg2
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| 139 | bv,n %r0(%rp)
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| 140 |
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| 141 | ENDPROC_CFI(relocate_new_kernel);
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| 142 |
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| 143 | ENTRY(relocate_new_kernel_size)
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| 144 | .word relocate_new_kernel_size - relocate_new_kernel
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| 145 |
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| 146 | kexec_param cmdline
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| 147 | kexec_param initrd_start
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| 148 | kexec_param initrd_end
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| 149 | kexec_param free_mem
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