| 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 | #define INITIAL_STACK_SIZE 8192
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| 34 |
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| 35 | #define NWINDOWS 8
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| 36 |
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| 37 | .register %g2, #scratch
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| 38 | .register %g3, #scratch
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| 39 | .register %g6, #scratch
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| 40 | .register %g7, #scratch
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| 41 |
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| 42 | .section BOOTSTRAP, "ax"
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| 43 |
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| 44 | .global start
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| 45 | start:
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| 46 | ba %xcc, 1f
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| 47 | nop
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| 48 |
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| 49 | /*
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| 50 | * This header forces SILO to load the image at 0x4000.
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| 51 | * More precisely, SILO will think this is an old version of Linux.
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| 52 | */
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| 53 | .ascii "HdrS"
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| 54 | .word 0
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| 55 | .half 0
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| 56 | .half 0
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| 57 | .half 0
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| 58 | .half 0
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| 59 |
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| 60 | .global silo_ramdisk_image
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| 61 | silo_ramdisk_image:
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| 62 | .word 0
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| 63 |
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| 64 | .global silo_ramdisk_size
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| 65 | silo_ramdisk_size:
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| 66 | .word 0
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| 67 |
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| 68 | .align 8
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| 69 | 1:
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| 70 | /*
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| 71 | * Disable interrupts and disable address masking.
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| 72 | */
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| 73 | wrpr %g0, PSTATE_PRIV_BIT, %pstate
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| 74 |
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| 75 | wrpr %g0, NWINDOWS - 2, %cansave ! set maximum saveable windows
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| 76 | wrpr %g0, 0, %canrestore ! get rid of windows we will never need again
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| 77 | wrpr %g0, 0, %otherwin ! make sure the window state is consistent
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| 78 | wrpr %g0, NWINDOWS - 1, %cleanwin ! prevent needless clean_window traps for kernel
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| 79 |
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| 80 | set initial_stack_top, %sp
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| 81 | add %sp, -STACK_BIAS, %sp
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| 82 |
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| 83 | set ofw_cif, %l0
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| 84 |
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| 85 | call ofw_init ! initialize OpenFirmware
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| 86 | stx %o4, [%l0]
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| 87 |
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| 88 | ba %xcc, bootstrap
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| 89 | nop
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| 90 |
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| 91 | .align STACK_ALIGNMENT
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| 92 | initial_stack:
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| 93 | .space INITIAL_STACK_SIZE
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| 94 |
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| 95 | initial_stack_top:
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| 96 | .space STACK_WINDOW_SAVE_AREA_SIZE
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