| 1 | #
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| 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 |
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| 29 | #include <arch/regdef.h>
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| 30 |
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| 31 | .register %g2, #scratch
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| 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 |
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| 36 | .section K_TEXT_START, "ax"
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| 37 |
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| 38 | /*
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| 39 | * Here is where the kernel is passed control
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| 40 | * from the boot loader.
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| 41 | *
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| 42 | * The registers are expected to be in this state:
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| 43 | * - %o0 bootinfo structure address
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| 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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| 51 | */
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| 52 |
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| 53 | .global kernel_image_start
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| 54 | kernel_image_start:
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| 55 | flushw ! flush all but the active register window
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| 56 |
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| 57 | /*
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| 58 | * Disable interrupts and disable 32-bit address masking.
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| 59 | */
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| 60 | rdpr %pstate, %l0
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| 61 | and %l0, ~(PSTATE_AM_BIT|PSTATE_IE_BIT), %l0
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| 62 | wrpr %l0, 0, %pstate
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| 63 |
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| 64 | /*
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| 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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| 72 | nop
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| 73 |
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| 74 | /*
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| 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 |
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| 85 | wrpr %r0, 0, %pil
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| 86 |
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| 87 | call main_bsp
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| 88 | nop
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| 89 |
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| 90 | /* Not reached. */
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| 91 |
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| 92 | 2:
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| 93 | b 2b
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| 94 | nop
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