| 1 | /*
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| 2 | * Copyright (c) 2011 Martin Decky
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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 | #include <arch/boot/boot.h>
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| 30 | #include <arch/pm.h>
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| 31 | #include <arch/cpuid.h>
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| 32 | #include <genarch/multiboot/multiboot2.h>
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| 33 |
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| 34 | #define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
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| 35 |
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| 36 | .section K_TEXT_START, "ax"
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| 37 |
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| 38 | .code32
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| 39 |
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| 40 | .align 8
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| 41 | .global multiboot2_image_start
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| 42 | multiboot2_header_start:
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| 43 | .long MULTIBOOT2_HEADER_MAGIC
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| 44 | .long MULTIBOOT2_HEADER_ARCH_I386
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| 45 | .long multiboot2_header_end - multiboot2_header_start
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| 46 | .long -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT2_HEADER_ARCH_I386 + (multiboot2_header_end - multiboot2_header_start))
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| 47 |
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| 48 | /* Information request tag */
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| 49 | tag_info_req_start:
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| 50 | .word MULTIBOOT2_TAG_INFO_REQ
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| 51 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 52 | .long tag_info_req_end - tag_info_req_start
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| 53 | .long MULTIBOOT2_TAG_MODULE
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| 54 | .long MULTIBOOT2_TAG_MEMMAP
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| 55 | #ifdef CONFIG_FB
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| 56 | .long MULTIBOOT2_TAG_FBINFO
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| 57 | #endif
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| 58 | tag_info_req_end:
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| 59 |
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| 60 | /* Address tag */
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| 61 | tag_address_start:
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| 62 | .word MULTIBOOT2_TAG_ADDRESS
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| 63 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 64 | .long tag_address_end - tag_address_start
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| 65 | .long multiboot2_header_start
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| 66 | .long unmapped_ktext_start
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| 67 | .long 0
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| 68 | .long 0
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| 69 | tag_address_end:
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| 70 |
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| 71 | /* Entry address tag */
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| 72 | tag_entry_address_start:
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| 73 | .word MULTIBOOT2_TAG_ENTRY_ADDRESS
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| 74 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 75 | .long tag_entry_address_end - tag_entry_address_start
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| 76 | .long multiboot2_image_start
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| 77 | tag_entry_address_end:
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| 78 |
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| 79 | /* Flags tag */
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| 80 | tag_flags_start:
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| 81 | .word MULTIBOOT2_TAG_FLAGS
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| 82 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 83 | .long tag_flags_end - tag_flags_start
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| 84 | .long MULTIBOOT2_FLAGS_CONSOLE
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| 85 | tag_flags_end:
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| 86 |
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| 87 | #ifdef CONFIG_FB
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| 88 | /* Framebuffer tag */
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| 89 | tag_framebuffer_start:
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| 90 | .word MULTIBOOT2_TAG_FRAMEBUFFER
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| 91 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 92 | .long tag_framebuffer_end - tag_framebuffer_start
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| 93 | .long CONFIG_BFB_WIDTH
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| 94 | .long CONFIG_BFB_HEIGHT
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| 95 | .long CONFIG_BFB_BPP
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| 96 | tag_framebuffer_end:
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| 97 | #endif
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| 98 |
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| 99 | /* Module alignment tag */
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| 100 | tag_module_align_start:
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| 101 | .word MULTIBOOT2_TAG_MODULE_ALIGN
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| 102 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 103 | .long tag_module_align_end - tag_module_align_start
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| 104 | .long 0
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| 105 | tag_module_align_end:
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| 106 |
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| 107 | /* Tag terminator */
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| 108 | tag_terminator_start:
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| 109 | .word MULTIBOOT2_TAG_TERMINATOR
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| 110 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 111 | .long tag_terminator_end - tag_terminator_start
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| 112 | tag_terminator_end:
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| 113 | multiboot2_header_end:
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| 114 |
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| 115 | multiboot2_image_start:
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| 116 | cld
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| 117 |
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| 118 | /* Initialize stack pointer */
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| 119 | movl $START_STACK, %esp
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| 120 |
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| 121 | /* Initialize Global Descriptor Table register */
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| 122 | lgdtl bootstrap_gdtr
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| 123 |
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| 124 | /* Kernel data + stack */
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| 125 | movw $GDT_SELECTOR(KDATA_DES), %cx
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| 126 | movw %cx, %es
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| 127 | movw %cx, %fs
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| 128 | movw %cx, %gs
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| 129 | movw %cx, %ds
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| 130 | movw %cx, %ss
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| 131 |
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| 132 | jmpl $GDT_SELECTOR(KTEXT_DES), $multiboot2_meeting_point
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| 133 | multiboot2_meeting_point:
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| 134 |
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| 135 | /* Save multiboot arguments */
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| 136 | movl %eax, multiboot_eax
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| 137 | movl %ebx, multiboot_ebx
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| 138 |
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| 139 | #ifndef PROCESSOR_i486
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| 140 |
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| 141 | movl $(INTEL_CPUID_LEVEL), %eax
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| 142 | cpuid
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| 143 | cmp $0x0, %eax /* any function > 0? */
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| 144 | jbe pse_unsupported
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| 145 |
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| 146 | movl $(INTEL_CPUID_STANDARD), %eax
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| 147 | cpuid
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| 148 | bt $(INTEL_PSE), %edx
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| 149 | jnc pse_unsupported
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| 150 |
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| 151 | /* Map kernel and turn paging on */
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| 152 | call map_kernel_pse
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| 153 | jmp stack_init
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| 154 |
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| 155 | #endif /* PROCESSOR_i486 */
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| 156 |
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| 157 | pse_unsupported:
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| 158 |
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| 159 | /* Map kernel and turn paging on */
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| 160 | call map_kernel_non_pse
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| 161 |
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| 162 | stack_init:
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| 163 |
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| 164 | /* Create the first stack frame */
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| 165 | pushl $0
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| 166 | movl %esp, %ebp
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| 167 |
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| 168 | /* Call arch_pre_main(multiboot_eax, multiboot_ebx) */
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| 169 | pushl multiboot_ebx
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| 170 | pushl multiboot_eax
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| 171 | call arch_pre_main
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| 172 |
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| 173 | /* Call main_bsp() */
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| 174 | call main_bsp
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| 175 |
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| 176 | /* Not reached */
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| 177 | cli
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| 178 | hlt0:
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| 179 | hlt
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| 180 | jmp hlt0
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