Rev 846 | Rev 867 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
418 | jermar | 1 | # |
2 | # Copyright (C) 2005 Jakub Jermar |
||
3 | # All rights reserved. |
||
4 | # |
||
5 | # Redistribution and use in source and binary forms, with or without |
||
6 | # modification, are permitted provided that the following conditions |
||
7 | # are met: |
||
8 | # |
||
9 | # - Redistributions of source code must retain the above copyright |
||
10 | # notice, this list of conditions and the following disclaimer. |
||
11 | # - Redistributions in binary form must reproduce the above copyright |
||
12 | # notice, this list of conditions and the following disclaimer in the |
||
13 | # documentation and/or other materials provided with the distribution. |
||
14 | # - The name of the author may not be used to endorse or promote products |
||
15 | # derived from this software without specific prior written permission. |
||
16 | # |
||
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
27 | # |
||
28 | |||
846 | jermar | 29 | #include <arch/boot/boot.h> |
30 | |||
426 | jermar | 31 | .register %g2, #scratch |
32 | .register %g3, #scratch |
||
33 | .register %g6, #scratch |
||
34 | .register %g7, #scratch |
||
35 | |||
418 | jermar | 36 | .section K_TEXT_START, "ax" |
37 | |||
847 | jermar | 38 | /* |
39 | * Here is where the kernel is passed control. |
||
40 | * The code must be position independent until |
||
41 | * the kernel relocates itself to its VMA. |
||
42 | */ |
||
43 | |||
418 | jermar | 44 | .global kernel_image_start |
45 | kernel_image_start: |
||
46 | 0: |
||
424 | jermar | 47 | b 1f |
418 | jermar | 48 | nop |
424 | jermar | 49 | |
847 | jermar | 50 | /* |
51 | * This header forces SILO to load the kernel at 0x4000. |
||
52 | * More precisely, SILO will think this is an old version of Linux. |
||
53 | */ |
||
424 | jermar | 54 | .ascii "HdrS" |
55 | .word 0 |
||
56 | .half 0 |
||
57 | |||
58 | .align 8 |
||
59 | |||
60 | 1: |
||
846 | jermar | 61 | flushw ! flush all but the active register window |
62 | |||
63 | /* |
||
64 | * Prepare to copy the kernel image to 4M. |
||
65 | */ |
||
66 | |||
67 | set LMA, %g1 ! source address |
||
847 | jermar | 68 | set VMA, %g2 ! destination address |
846 | jermar | 69 | set hardcoded_ktext_size, %g3 ! link address of hardcoded_ktext_size |
70 | set hardcoded_kdata_size, %g4 ! link address of hardcoded_kdata_size |
||
71 | |||
72 | sub %g3, %g2, %g3 ! offset of hardcoded_ktext_size from the beginning of the load address |
||
73 | sub %g4, %g2, %g4 ! offset of hardcoded_kdata_size from the beginning of the load address |
||
74 | |||
75 | ldx [%g3 + %g1], %g3 ! hardcoded_ktext_size -> %g3 |
||
76 | ldx [%g4 + %g1], %g4 ! hardcoded_kdata_size -> %g4 |
||
77 | |||
78 | add %g3, %g4, %g3 ! size of kernel text and data |
||
79 | |||
80 | /* |
||
81 | * Start copying the kernel from higher addresses towards lower addresses. |
||
82 | */ |
||
83 | |||
84 | 2: dec %g3 |
||
85 | ldub [%g1 + %g3], %g4 |
||
86 | stb %g4, [%g2 + %g3] |
||
87 | cmp %g3, 0 |
||
88 | bnz 2b |
||
89 | nop |
||
90 | |||
91 | set relocated, %g1 |
||
92 | jmp %g1 |
||
93 | nop |
||
94 | |||
95 | relocated: |
||
424 | jermar | 96 | set ofw, %l0 |
97 | |||
98 | call ofw_init |
||
529 | jermar | 99 | stx %o4, [%l0] |
424 | jermar | 100 | |
426 | jermar | 101 | call main_bsp |
102 | nop |
||
103 | |||
104 | /* Not reached. */ |
||
105 | |||
424 | jermar | 106 | 2: |
107 | b 2b |
||
108 | nop |