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| 1 | jermar | 1 | # |
| 2 | # Copyright (C) 2001-2004 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 | |||
| 29 | .section K_TEXT_START |
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| 30 | .global kernel_image_start |
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| 31 | |||
| 32 | .code16 |
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| 33 | # |
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| 34 | # This is where we require any SPARTAN-kernel-compatible boot loader |
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| 35 | # to pass control in real mode. |
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| 36 | # |
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| 37 | # Protected mode tables are statically initialised during compile |
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| 38 | # time. So we can just load the respective table registers and |
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| 39 | # switch to protected mode. |
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| 40 | # |
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| 41 | kernel_image_start: |
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| 42 | cli |
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| 43 | xorw %ax,%ax |
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| 44 | movw %ax,%ds |
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| 45 | lgdt gdtr |
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| 46 | movl %cr0,%eax |
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| 47 | orl $0x1,%eax |
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| 48 | movl %eax,%cr0 |
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| 49 | jmp 0f |
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| 50 | 0: |
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| 51 | movw $16,%ax |
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| 52 | movw %ax,%es |
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| 53 | movw %ax,%gs |
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| 54 | movw %ax,%fs |
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| 55 | movw %ax,%ds # kernel data + stack |
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| 56 | movw %ax,%ss |
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| 57 | movl $0x7c00,%esp |
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| 58 | jmpl $8,$meeting_point |
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| 59 | meeting_point: |
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| 60 | .code32 |
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| 61 | |||
| 62 | lidt idtr |
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| 63 | |||
| 64 | call main_bsp # never returns |
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| 65 | |||
| 66 | |||
| 67 | cli |
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| 68 | hlt |