| 1 | #
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| 2 | # Copyright (c) 2001-2004 Jakub Jermar
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| 3 | # Copyright (c) 2005-2006 Martin Decky
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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 | /*
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| 31 | * Init code for application processors.
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| 32 | */
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| 33 |
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| 34 | #include <abi/asmtool.h>
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| 35 | #include <arch/boot/boot.h>
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| 36 | #include <arch/boot/memmap.h>
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| 37 | #include <arch/mm/page.h>
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| 38 | #include <arch/pm.h>
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| 39 |
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| 40 | .section K_TEXT_START, "ax"
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| 41 |
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| 42 | #ifdef CONFIG_SMP
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| 43 |
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| 44 | KTEXT=8
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| 45 | KDATA=16
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| 46 |
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| 47 | /*
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| 48 | * This piece of code is real-mode and is meant to be aligned at 4K boundary.
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| 49 | * The requirement for such an alignment comes from MP Specification's
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| 50 | * STARTUP IPI requirements.
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| 51 | */
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| 52 |
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| 53 | .align 4096
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| 54 | SYMBOL(unmapped_ap_boot)
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| 55 | .code16
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| 56 | cli
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| 57 | xorw %ax, %ax
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| 58 | movw %ax, %ds
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| 59 |
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| 60 | /* initialize Global Descriptor Table register */
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| 61 | lgdtl ap_gdtr
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| 62 |
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| 63 | /* switch to protected mode */
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| 64 | movl %cr0, %eax
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| 65 | orl $1, %eax
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| 66 | movl %eax, %cr0
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| 67 | jmpl $KTEXT, $jump_to_kernel - BOOT_OFFSET + AP_BOOT_OFFSET
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| 68 |
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| 69 | jump_to_kernel:
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| 70 | .code32
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| 71 | movw $KDATA, %ax
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| 72 | movw %ax, %ds
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| 73 | movw %ax, %es
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| 74 | movw %ax, %ss
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| 75 | movl $KA2PA(ctx), %eax /* KA2PA((uintptr_t) &ctx) */
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| 76 | movl (%eax), %esp
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| 77 | subl $0x80000000, %esp /* KA2PA(ctx.sp) */
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| 78 |
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| 79 | /*
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| 80 | * Map kernel and turn paging on.
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| 81 | * We assume that when using SMP, PSE is always available
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| 82 | */
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| 83 | call map_kernel_pse
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| 84 |
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| 85 | addl $0x80000000, %esp /* PA2KA(ctx.sp) */
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| 86 |
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| 87 | /* create the first stack frame */
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| 88 | pushl $0
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| 89 | movl %esp, %ebp
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| 90 |
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| 91 | jmpl $KTEXT, $main_ap
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| 92 |
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| 93 | #endif /* CONFIG_SMP */
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| 94 |
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| 95 |
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| 96 | .section K_DATA_START, "aw", @progbits
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| 97 |
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| 98 | #ifdef CONFIG_SMP
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| 99 |
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| 100 | SYMBOL(unmapped_ap_gdtr)
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| 101 | .word 0
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| 102 | .long 0
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| 103 |
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| 104 | #endif /* CONFIG_SMP */
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