| 1 | #
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| 2 | # Copyright (C) 2001-2004 Ondrej Palkovsky
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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 | #define __ASM__
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| 30 |
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| 31 | #include <arch/mm/page.h>
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| 32 | #include <arch/mm/ptl.h>
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| 33 | #include <arch/pm.h>
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| 34 |
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| 35 | #define START_STACK 0x7c00
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| 36 | #define START_STACK_64 $0xffffffff80007c00
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| 37 |
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| 38 | #
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| 39 | # This is where we require any SPARTAN-kernel-compatible boot loader
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| 40 | # to pass control in real mode.
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| 41 | #
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| 42 | # Protected mode tables are statically initialised during compile
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| 43 | # time. So we can just load the respective table registers and
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| 44 | # switch to protected mode.
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| 45 | #
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| 46 | .section K_TEXT_START
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| 47 | .code16
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| 48 | .global kernel_image_start
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| 49 | kernel_image_start:
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| 50 | cli
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| 51 | xorw %ax,%ax
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| 52 | movw %ax,%ds
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| 53 | movw %ax,%ss # initialize stack segment register
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| 54 | movl START_STACK,%esp # initialize stack pointer
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| 55 |
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| 56 | # call memmap_arch_init
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| 57 |
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| 58 | movl $0x80000000, %eax
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| 59 | cpuid
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| 60 | cmp $0x80000000, %eax # any function > 80000000h?
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| 61 | jbe no_long_mode
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| 62 | movl $0x80000001, %eax # Extended function code 80000001
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| 63 | cpuid
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| 64 | bt $29, %edx # Test if long mode is supported.
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| 65 | jnc no_long_mode
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| 66 |
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| 67 | # Load gdtr, idtr
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| 68 | lgdt gdtr_inst
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| 69 | # Load idtr, but it contains mess - we should not get interrupt
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| 70 | # anyway
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| 71 | lidt idtr_inst
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| 72 |
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| 73 | movl %cr0,%eax
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| 74 | orl $0x1,%eax
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| 75 | movl %eax,%cr0 # switch to protected mode
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| 76 |
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| 77 | jmpl $gdtselector(KTEXT32_DES), $now_in_prot
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| 78 |
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| 79 | no_long_mode:
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| 80 | 1:
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| 81 | jmp 1b
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| 82 |
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| 83 | # Protected 16-bit. We want to reuse the code-seg descriptor,
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| 84 | # the Default operand size must not be 1 when entering long mode
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| 85 | now_in_prot:
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| 86 | # Set up stack & data descriptors
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| 87 | movw $gdtselector(KDATA_DES), %ax
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| 88 | movw %ax, %ds
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| 89 | movw %ax, %fs
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| 90 | movw %ax, %gs
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| 91 | movw %ax, %ss
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| 92 |
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| 93 | # Enable 64-bit page transaltion entries - CR4.PAE = 1.
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| 94 | # Paging is not enabled until after long mode is enabled
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| 95 | movl %cr4, %eax
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| 96 | btsl $5, %eax
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| 97 | movl %eax, %cr4
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| 98 |
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| 99 | # Set up paging tables
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| 100 | leal ptl_0, %eax
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| 101 | movl %eax, %cr3
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| 102 |
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| 103 | # Enable long mode
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| 104 | movl $0xc0000080, %ecx # EFER MSR number
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| 105 | rdmsr # Read EFER
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| 106 | btsl $8, %eax # Set LME=1
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| 107 | wrmsr # Write EFER
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| 108 |
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| 109 | # Enable paging to activate long mode (set CR0.PG=1)
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| 110 | movl %cr0, %eax
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| 111 | btsl $31, %eax
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| 112 | movl %eax, %cr0
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| 113 |
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| 114 | # At this point we are in compatibility mode
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| 115 | jmpl $gdtselector(KTEXT_DES), $start64
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| 116 |
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| 117 | .code64
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| 118 | start64:
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| 119 | movq START_STACK_64, %rsp
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| 120 |
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| 121 | call main_bsp # never returns
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| 122 | 1:
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| 123 | jmp 1b
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| 124 |
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| 125 | .section K_DATA_START
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| 126 | .align 4096
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| 127 |
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| 128 | # Identical mapping of first 16MB and the same of -2GB -> 0
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| 129 | .global ptl_2
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| 130 | ptl_2:
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| 131 | .quad 0x0 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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| 132 | .quad 0x200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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| 133 | .quad 0x400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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| 134 | .quad 0x600000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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| 135 | .quad 0x800000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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| 136 | .quad 0xa00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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| 137 | .quad 0xc00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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| 138 | .quad 0xe00000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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| 139 |
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| 140 | .align 4096
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| 141 | .global ptl_1
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| 142 | ptl_1:
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| 143 | .quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
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| 144 | .fill 509,8,0
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| 145 | .quad ptl_2 + (PTL_WRITABLE | PTL_PRESENT)
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| 146 | .fill 2,8,0
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| 147 |
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| 148 | .align 4096
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| 149 | .global ptl_0
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| 150 | ptl_0:
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| 151 | .quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
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| 152 | .fill 510,8,0
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| 153 | .quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
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| 154 |
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| 155 | .global gdtr_inst
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| 156 | gdtr_inst:
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| 157 | .word gdtselector(GDT_ITEMS)
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| 158 | .long KA2PA(gdt)
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| 159 |
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| 160 | .global idtr_inst
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| 161 | idtr_inst:
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| 162 | .word idtselector(IDT_ITEMS)
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| 163 | .long KA2PA(idt)
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