| 1 | #
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| 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 |
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| 29 | #
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| 30 | # Init code for application processors.
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| 31 | #
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| 32 |
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| 33 | .section K_TEXT_START_2
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| 34 |
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| 35 | #ifdef __SMP__
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| 36 |
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| 37 | .global ap_boot
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| 38 |
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| 39 | KTEXT=8
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| 40 | KDATA=16
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| 41 |
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| 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 |
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| 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 | xorw %ax, %ax
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| 51 | movw %ax, %ds
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| 52 |
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| 53 | lgdt real_bootstrap_gdtr # initialize Global Descriptor Table register
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| 54 |
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| 55 | movl %cr0, %eax
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| 56 | orl $1, %eax
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| 57 | movl %eax, %cr0 # switch to protected mode
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| 58 | jmpl $KTEXT, $jump_to_kernel
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| 59 |
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| 60 | jump_to_kernel:
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| 61 | .code32
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| 62 | movw $KDATA, %ax
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| 63 | movw %ax, %ds
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| 64 | movw %ax, %es
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| 65 | movw %ax, %ss
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| 66 | movl $(ctx-0x80000000), %eax # KA2PA((__address) &ctx)
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| 67 | movl (%eax), %esp
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| 68 | subl $0x80000000, %esp # KA2PA(ctx.sp)
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| 69 |
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| 70 | call map_kernel # map kernel and turn paging on
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| 71 |
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| 72 | movb $0xd1, %al # enable A20 using the keyboard controller
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| 73 | outb %al, $0x64
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| 74 | movb $0xdf, %al
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| 75 | outb %al, $0x60
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| 76 |
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| 77 | jmpl $KTEXT, $main_ap
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| 78 |
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| 79 | #endif /* __SMP__ */
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