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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 | # |
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30 | # Init code for application processors. |
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31 | # |
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32 | |||
33 | .text |
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34 | |||
35 | #ifdef __SMP__ |
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36 | |||
37 | .global ap_boot |
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38 | |||
39 | KTEXT=8 |
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40 | KDATA=16 |
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41 | |||
42 | # This piece of code is real-mode and is meant to be alligned at 4K boundary. |
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43 | # The requirement for such an alignment comes from MP Specification's STARTUP IPI |
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44 | # requirements. |
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45 | |||
46 | .align 4096 |
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47 | ap_boot: |
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48 | .code16 |
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49 | cli |
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50 | |||
51 | xorw %ax,%ax |
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52 | movw %ax,%ds |
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53 | |||
54 | lgdt gdtr |
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55 | movl %cr0,%eax |
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56 | orl $1,%eax |
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57 | movl %eax,%cr0 |
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58 | ljmp $KTEXT,$jump_to_kernel |
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59 | |||
60 | # this is where the AP enters the kernel space |
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61 | jump_to_kernel: |
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62 | .code32 |
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63 | movw $KDATA,%ax |
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64 | movw %ax,%ds |
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65 | movw %ax,%es |
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66 | movw %ax,%ss |
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67 | movl $ctx,%eax |
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68 | movl (%eax),%esp |
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69 | |||
70 | lidt idtr |
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71 | |||
72 | ljmp $KTEXT,$main_ap |
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73 | |||
74 | #endif /* __SMP__ */ |