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418 | jermar | 1 | # |
2 | # Copyright (C) 2005 Jakub Jermar |
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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 | |||
1789 | jermar | 29 | #include <arch/regdef.h> |
846 | jermar | 30 | |
426 | jermar | 31 | .register %g2, #scratch |
32 | .register %g3, #scratch |
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33 | .register %g6, #scratch |
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34 | .register %g7, #scratch |
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35 | |||
418 | jermar | 36 | .section K_TEXT_START, "ax" |
37 | |||
847 | jermar | 38 | /* |
1789 | jermar | 39 | * Here is where the kernel is passed control |
40 | * from the boot loader. |
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1790 | jermar | 41 | * |
42 | * The registers are expected to be in this state: |
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1792 | jermar | 43 | * - %o0 bootinfo structure address |
44 | * - %o1 bootinfo structure size |
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45 | * |
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46 | * Moreover, we depend on boot having established the |
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47 | * following environment: |
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48 | * - TLBs are on |
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49 | * - identity mapping for the kernel image |
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50 | * - identity mapping for memory stack |
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847 | jermar | 51 | */ |
52 | |||
418 | jermar | 53 | .global kernel_image_start |
54 | kernel_image_start: |
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846 | jermar | 55 | flushw ! flush all but the active register window |
56 | |||
1790 | jermar | 57 | /* |
58 | * Disable interrupts and disable 32-bit address masking. |
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59 | */ |
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1784 | jermar | 60 | rdpr %pstate, %l0 |
1790 | jermar | 61 | and %l0, ~(PSTATE_AM_BIT|PSTATE_IE_BIT), %l0 |
1784 | jermar | 62 | wrpr %l0, 0, %pstate |
424 | jermar | 63 | |
1790 | jermar | 64 | /* |
65 | * Copy the bootinfo structure passed from the boot loader |
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66 | * to the kernel bootinfo structure. |
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67 | */ |
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68 | mov %o1, %o2 |
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69 | mov %o0, %o1 |
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70 | set bootinfo, %o0 |
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71 | call memcpy |
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867 | jermar | 72 | nop |
73 | |||
1792 | jermar | 74 | /* |
75 | * Take over control of identity mapping. |
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76 | * Take over control of trap table. |
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77 | * |
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78 | * After this call, the kernel is entirely self-sufficient |
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79 | * and independent on OpenFirmware. |
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80 | */ |
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81 | set kernel_image_start, %o0 |
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82 | call take_over_tlb_and_tt |
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83 | nop |
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84 | |||
895 | jermar | 85 | wrpr %r0, 0, %pil |
86 | |||
426 | jermar | 87 | call main_bsp |
88 | nop |
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89 | |||
90 | /* Not reached. */ |
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91 | |||
424 | jermar | 92 | 2: |
93 | b 2b |
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94 | nop |