| 1 | #
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| 2 | # Copyright (c) 2006 Martin Decky
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | #include "asm.h"
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| 30 | #include "regname.h"
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| 31 | #include "ofwarch.h"
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| 32 |
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| 33 | .macro SMC_COHERENCY addr
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| 34 | dcbst 0, \addr
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| 35 | sync
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| 36 | icbi 0, \addr
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| 37 | sync
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| 38 | isync
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| 39 | .endm
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| 40 |
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| 41 | .macro FLUSH_DCACHE addr
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| 42 | dcbst 0, \addr
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| 43 | sync
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| 44 | isync
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| 45 | .endm
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| 46 |
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| 47 | .macro TLB_FLUSH reg
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| 48 | li \reg, 0
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| 49 | sync
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| 50 |
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| 51 | .rept 64
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| 52 | tlbie \reg
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| 53 | addi \reg, \reg, 0x1000
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| 54 | .endr
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| 55 |
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| 56 | eieio
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| 57 | tlbsync
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| 58 | sync
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| 59 | .endm
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| 60 |
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| 61 | .text
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| 62 |
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| 63 | .global halt
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| 64 | .global memcpy
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| 65 | .global jump_to_kernel
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| 66 | .global balloc_base
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| 67 |
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| 68 | halt:
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| 69 | b halt
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| 70 |
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| 71 | memcpy:
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| 72 | srwi. r7, r5, 3
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| 73 | addi r6, r3, -4
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| 74 | addi r4, r4, -4
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| 75 | beq 2f
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| 76 |
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| 77 | andi. r0, r6, 3
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| 78 | mtctr r7
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| 79 | bne 5f
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| 80 |
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| 81 | 1:
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| 82 | lwz r7, 4(r4)
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| 83 | lwzu r8, 8(r4)
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| 84 | stw r7, 4(r6)
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| 85 | stwu r8, 8(r6)
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| 86 | bdnz 1b
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| 87 |
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| 88 | andi. r5, r5, 7
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| 89 |
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| 90 | 2:
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| 91 | cmplwi 0, r5, 4
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| 92 | blt 3f
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| 93 |
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| 94 | lwzu r0, 4(r4)
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| 95 | addi r5, r5, -4
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| 96 | stwu r0, 4(r6)
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| 97 |
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| 98 | 3:
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| 99 | cmpwi 0, r5, 0
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| 100 | beqlr
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| 101 | mtctr r5
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| 102 | addi r4, r4, 3
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| 103 | addi r6, r6, 3
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| 104 |
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| 105 | 4:
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| 106 | lbzu r0, 1(r4)
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| 107 | stbu r0, 1(r6)
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| 108 | bdnz 4b
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| 109 | blr
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| 110 |
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| 111 | 5:
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| 112 | subfic r0, r0, 4
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| 113 | mtctr r0
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| 114 |
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| 115 | 6:
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| 116 | lbz r7, 4(r4)
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| 117 | addi r4, r4, 1
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| 118 | stb r7, 4(r6)
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| 119 | addi r6, r6, 1
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| 120 | bdnz 6b
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| 121 | subf r5, r0, r5
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| 122 | rlwinm. r7, r5, 32-3, 3, 31
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| 123 | beq 2b
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| 124 | mtctr r7
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| 125 | b 1b
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| 126 |
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| 127 | jump_to_kernel:
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| 128 |
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| 129 | # r3 = bootinfo (pa)
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| 130 | # r4 = bootinfo_size
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| 131 | # r5 = trans (pa)
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| 132 | # r6 = bytes to copy
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| 133 | # r7 = real_mode (pa)
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| 134 |
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| 135 | # disable interrupts
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| 136 |
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| 137 | mfmsr r31
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| 138 | rlwinm r31, r31, 0, 17, 15
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| 139 | mtmsr r31
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| 140 |
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| 141 | # set real_mode meeting point address
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| 142 |
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| 143 | mtspr srr0, r7
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| 144 |
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| 145 | # jumps to real_mode
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| 146 |
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| 147 | mfmsr r31
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| 148 | lis r30, ~0@h
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| 149 | ori r30, r30, ~(msr_ir | msr_dr | msr_ee)@l
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| 150 | and r31, r31, r30
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| 151 | mtspr srr1, r31
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| 152 |
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| 153 | sync
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| 154 | isync
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| 155 | rfi
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| 156 |
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| 157 | .align PAGE_WIDTH
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| 158 | balloc_base:
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| 159 | .fill BALLOC_MAX_SIZE
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| 160 |
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| 161 | .section REALMODE, "ax"
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| 162 |
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| 163 | .align PAGE_WIDTH
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| 164 | .global real_mode
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| 165 | real_mode:
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| 166 |
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| 167 | # copy kernel to proper location
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| 168 | #
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| 169 | # r3 = bootinfo (pa)
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| 170 | # r4 = bootinfo_size
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| 171 | # r5 = trans (pa)
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| 172 | # r6 = bytes to copy
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| 173 |
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| 174 | li r31, PAGE_SIZE >> 2
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| 175 | li r30, 0
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| 176 |
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| 177 | page_copy:
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| 178 |
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| 179 | cmpwi r6, 0
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| 180 | beq copy_end
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| 181 |
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| 182 | # copy page
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| 183 |
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| 184 | mtctr r31
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| 185 | lwz r29, 0(r5)
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| 186 |
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| 187 | copy_loop:
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| 188 |
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| 189 | lwz r28, 0(r29)
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| 190 | stw r28, 0(r30)
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| 191 |
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| 192 | SMC_COHERENCY r30
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| 193 |
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| 194 | addi r29, r29, 4
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| 195 | addi r30, r30, 4
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| 196 | subi r6, r6, 4
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| 197 |
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| 198 | cmpwi r6, 0
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| 199 | beq copy_end
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| 200 |
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| 201 | bdnz copy_loop
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| 202 |
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| 203 | addi r5, r5, 4
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| 204 | b page_copy
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| 205 |
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| 206 | copy_end:
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| 207 |
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| 208 | # initially fill segment registers
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| 209 |
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| 210 | li r31, 0
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| 211 |
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| 212 | li r29, 8
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| 213 | mtctr r29
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| 214 | li r30, 0 # ASID 0 (VSIDs 0 .. 7)
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| 215 |
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| 216 | seg_fill_uspace:
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| 217 |
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| 218 | mtsrin r30, r31
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| 219 | addi r30, r30, 1
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| 220 | addis r31, r31, 0x1000 # move to next SR
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| 221 |
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| 222 | bdnz seg_fill_uspace
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| 223 |
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| 224 | li r29, 8
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| 225 | mtctr r29
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| 226 | lis r30, 0x4000 # priviledged access only
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| 227 | ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15)
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| 228 |
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| 229 | seg_fill_kernel:
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| 230 |
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| 231 | mtsrin r30, r31
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| 232 | addi r30, r30, 1
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| 233 | addis r31, r31, 0x1000 # move to next SR
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| 234 |
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| 235 | bdnz seg_fill_kernel
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| 236 |
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| 237 | # invalidate block address translation registers
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| 238 |
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| 239 | li r30, 0
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| 240 |
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| 241 | mtspr ibat0u, r30
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| 242 | mtspr ibat0l, r30
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| 243 |
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| 244 | mtspr ibat1u, r30
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| 245 | mtspr ibat1l, r30
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| 246 |
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| 247 | mtspr ibat2u, r30
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| 248 | mtspr ibat2l, r30
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| 249 |
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| 250 | mtspr ibat3u, r30
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| 251 | mtspr ibat3l, r30
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| 252 |
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| 253 | mtspr dbat0u, r30
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| 254 | mtspr dbat0l, r30
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| 255 |
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| 256 | mtspr dbat1u, r30
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| 257 | mtspr dbat1l, r30
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| 258 |
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| 259 | mtspr dbat2u, r30
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| 260 | mtspr dbat2l, r30
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| 261 |
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| 262 | mtspr dbat3u, r30
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| 263 | mtspr dbat3l, r30
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| 264 |
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| 265 | # create empty Page Hash Table
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| 266 | # on top of memory, size 64 KB
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| 267 |
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| 268 | lwz r31, 0(r3) # r31 = memory size
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| 269 |
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| 270 | lis r30, 65536@h
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| 271 | ori r30, r30, 65536@l # r30 = 65536
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| 272 |
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| 273 | subi r29, r30, 1 # r29 = 65535
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| 274 |
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| 275 | sub r31, r31, r30
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| 276 | andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536)
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| 277 |
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| 278 | mtsdr1 r31
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| 279 |
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| 280 | li r29, 2
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| 281 | srw r30, r30, r29 # r30 = 16384
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| 282 | li r29, 0
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| 283 |
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| 284 | pht_clear:
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| 285 |
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| 286 | # write zeroes
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| 287 |
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| 288 | stw r29, 0(r31)
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| 289 | FLUSH_DCACHE r31
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| 290 |
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| 291 | addi r31, r31, 4
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| 292 | subi r30, r30, 4
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| 293 |
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| 294 | cmpwi r30, 0
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| 295 | beq clear_end
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| 296 |
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| 297 | bdnz pht_clear
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| 298 |
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| 299 | clear_end:
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| 300 |
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| 301 | #ifdef CONFIG_BAT
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| 302 |
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| 303 | # create BAT identity mapping
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| 304 |
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| 305 | lwz r31, 0(r3) # r31 = memory size
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| 306 |
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| 307 | lis r29, 0x0002
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| 308 | cmpw r31, r29
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| 309 | blt no_bat # less than 128 KB -> no BAT
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| 310 |
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| 311 | li r29, 18
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| 312 | srw r31, r31, r29 # r31 = total >> 18
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| 313 |
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| 314 | # create Block Length mask by replicating
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| 315 | # the leading logical one 14 times
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| 316 |
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| 317 | li r29, 14
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| 318 | mtctr r31
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| 319 | li r29, 1
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| 320 |
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| 321 | bat_mask:
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| 322 | srw r30, r31, r29 # r30 = mask >> 1
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| 323 | or r31, r31, r30 # mask = mask | r30
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| 324 |
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| 325 | bdnz bat_mask
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| 326 |
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| 327 | andi. r31, r31, 0x07ff # mask = mask & 0x07ff (BAT can map up to 256 MB)
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| 328 |
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| 329 | li r29, 2
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| 330 | slw r31, r31, r29 # mask = mask << 2
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| 331 | ori r31, r31, 0x0002 # mask = mask | 0x0002 (priviledged access only)
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| 332 |
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| 333 | lis r29, 0x8000
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| 334 | or r29, r29, r31
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| 335 |
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| 336 | lis r30, 0x0000
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| 337 | ori r30, r30, 0x0002
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| 338 |
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| 339 | mtspr ibat0u, r29
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| 340 | mtspr ibat0l, r30
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| 341 |
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| 342 | mtspr dbat0u, r29
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| 343 | mtspr dbat0l, r30
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| 344 |
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| 345 | no_bat:
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| 346 |
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| 347 | #endif
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| 348 |
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| 349 | # flush TLB
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| 350 |
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| 351 | TLB_FLUSH r31
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| 352 |
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| 353 | # start the kernel
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| 354 | #
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| 355 | # pc = PA2KA(BOOT_OFFSET)
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| 356 | # r3 = bootinfo (pa)
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| 357 | # sprg0 = BOOT_OFFSET
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| 358 | # sprg3 = physical memory size
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| 359 | # sp = 0 (pa)
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| 360 |
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| 361 | lis r31, PA2KA(BOOT_OFFSET)@ha
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| 362 | addi r31, r31, PA2KA(BOOT_OFFSET)@l
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| 363 | mtspr srr0, r31
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| 364 |
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| 365 | lis r31, BOOT_OFFSET@ha
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| 366 | addi r31, r31, BOOT_OFFSET@l
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| 367 | mtsprg0 r31
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| 368 |
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| 369 | lwz r31, 0(r3)
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| 370 | mtsprg3 r31
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| 371 |
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| 372 | li sp, 0
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| 373 |
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| 374 | mfmsr r31
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| 375 | ori r31, r31, (msr_ir | msr_dr)@l
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| 376 | mtspr srr1, r31
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| 377 |
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| 378 | sync
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| 379 | isync
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| 380 | rfi
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| 381 |
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| 382 | .align PAGE_WIDTH
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| 383 | .global trans
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| 384 | trans:
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| 385 | .rept TRANS_SIZE
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| 386 | .int 0
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| 387 | .endr
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