| 1 | #
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| 2 | # Copyright (c) 2006 Martin Decky
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| 3 | # Copyright (c) 2006 Jakub Jermar
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| 4 | # All rights reserved.
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| 5 | #
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| 6 | # Redistribution and use in source and binary forms, with or without
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| 7 | # modification, are permitted provided that the following conditions
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| 8 | # are met:
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| 9 | #
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| 10 | # - Redistributions of source code must retain the above copyright
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| 11 | # notice, this list of conditions and the following disclaimer.
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| 12 | # - Redistributions in binary form must reproduce the above copyright
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| 13 | # notice, this list of conditions and the following disclaimer in the
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| 14 | # documentation and/or other materials provided with the distribution.
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| 15 | # - The name of the author may not be used to endorse or promote products
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| 16 | # derived from this software without specific prior written permission.
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| 17 | #
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| 18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | #
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| 29 |
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| 30 | #include <stack.h>
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| 31 | #include <register.h>
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| 32 |
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| 33 | .text
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| 34 |
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| 35 | .global halt
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| 36 | .global memcpy
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| 37 | .global jump_to_kernel
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| 38 |
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| 39 | halt:
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| 40 | b halt
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| 41 | nop
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| 42 |
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| 43 | memcpy:
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| 44 | .register %g2, #scratch
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| 45 | .register %g3, #scratch
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| 46 | add %o1, 7, %g1
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| 47 | and %g1, -8, %g1
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| 48 | cmp %o1, %g1
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| 49 | be,pn %xcc, 3f
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| 50 | add %o0, 7, %g1
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| 51 | mov 0, %g3
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| 52 | 0:
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| 53 | brz,pn %o2, 2f
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| 54 | mov 0, %g2
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| 55 | 1:
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| 56 | ldub [%g3 + %o1], %g1
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| 57 | add %g2, 1, %g2
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| 58 | cmp %o2, %g2
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| 59 | stb %g1, [%g3 + %o0]
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| 60 | bne,pt %xcc, 1b
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| 61 | mov %g2, %g3
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| 62 | 2:
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| 63 | jmp %o7 + 8 ! exit point
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| 64 | mov %o1, %o0
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| 65 | 3:
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| 66 | and %g1, -8, %g1
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| 67 | cmp %o0, %g1
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| 68 | bne,pt %xcc, 0b
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| 69 | mov 0, %g3
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| 70 | srlx %o2, 3, %g4
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| 71 | brz,pn %g4, 5f
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| 72 | mov 0, %g5
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| 73 | 4:
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| 74 | sllx %g3, 3, %g2
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| 75 | add %g5, 1, %g3
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| 76 | ldx [%o1 + %g2], %g1
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| 77 | mov %g3, %g5
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| 78 | cmp %g4, %g3
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| 79 | bne,pt %xcc, 4b
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| 80 | stx %g1, [%o0 + %g2]
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| 81 | 5:
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| 82 | and %o2, 7, %o2
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| 83 | brz,pn %o2, 2b
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| 84 | sllx %g4, 3, %g1
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| 85 | mov 0, %g2
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| 86 | add %g1, %o0, %o0
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| 87 | add %g1, %o1, %g4
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| 88 | mov 0, %g3
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| 89 | 6:
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| 90 | ldub [%g2 + %g4], %g1
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| 91 | stb %g1, [%g2 + %o0]
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| 92 | add %g3, 1, %g2
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| 93 | cmp %o2, %g2
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| 94 | bne,pt %xcc, 6b
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| 95 | mov %g2, %g3
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| 96 |
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| 97 | jmp %o7 + 8 ! exit point
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| 98 | mov %o1, %o0
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| 99 |
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| 100 | jump_to_kernel:
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| 101 | /*
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| 102 | * We have copied code and now we need to guarantee cache coherence.
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| 103 | * 1. Make sure that the code we have moved has drained to main memory.
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| 104 | * 2. Invalidate I-cache.
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| 105 | * 3. Flush instruction pipeline.
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| 106 | */
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| 107 | call icache_flush
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| 108 | membar #StoreStore
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| 109 | flush %i7
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| 110 |
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| 111 | mov %o0, %l1
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| 112 | mov %o1, %o0
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| 113 | mov %o2, %o1
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| 114 | mov %o3, %o2
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| 115 | jmp %l1 ! jump to kernel
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| 116 | nop
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| 117 |
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| 118 | #define ICACHE_SIZE 8192
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| 119 | #define ICACHE_LINE_SIZE 32
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| 120 | #define ICACHE_SET_BIT (1 << 13)
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| 121 | #define ASI_ICACHE_TAG 0x67
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| 122 |
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| 123 | # Flush I-cache
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| 124 | icache_flush:
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| 125 | set ((ICACHE_SIZE - ICACHE_LINE_SIZE) | ICACHE_SET_BIT), %g1
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| 126 | stxa %g0, [%g1] ASI_ICACHE_TAG
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| 127 | 0: membar #Sync
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| 128 | subcc %g1, ICACHE_LINE_SIZE, %g1
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| 129 | bnz,pt %xcc, 0b
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| 130 | stxa %g0, [%g1] ASI_ICACHE_TAG
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| 131 | membar #Sync
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| 132 | retl
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| 133 | ! SF Erratum #51
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| 134 | nop
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| 135 |
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| 136 | .global ofw
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| 137 | ofw:
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| 138 | save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
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| 139 | set ofw_cif, %l0
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| 140 | ldx [%l0], %l0
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| 141 |
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| 142 | rdpr %pstate, %l1
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| 143 | and %l1, ~PSTATE_AM_BIT, %l2
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| 144 | wrpr %l2, 0, %pstate
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| 145 |
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| 146 | jmpl %l0, %o7
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| 147 | mov %i0, %o0
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| 148 |
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| 149 | wrpr %l1, 0, %pstate
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| 150 |
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| 151 | ret
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| 152 | restore %o0, 0, %o0
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