| 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/mm/page.h>
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| 31 | #include <arch/pm.h>
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| 32 | #include <arch/cpuid.h>
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| 33 | #include <arch/cpu.h>
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| 34 | #include <genarch/multiboot/multiboot2.h>
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| 35 |
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| 36 | #define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
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| 37 |
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| 38 | .section K_TEXT_START, "ax"
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| 39 |
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| 40 | .code32
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| 41 |
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| 42 | .align 8
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| 43 | .global multiboot2_image_start
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| 44 | multiboot2_header_start:
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| 45 | .long MULTIBOOT2_HEADER_MAGIC
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| 46 | .long MULTIBOOT2_HEADER_ARCH_I386
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| 47 | .long multiboot2_header_end - multiboot2_header_start
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| 48 | .long -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT2_HEADER_ARCH_I386 + (multiboot2_header_end - multiboot2_header_start))
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| 49 |
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| 50 | /* Information request tag */
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| 51 | tag_info_req_start:
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| 52 | .word MULTIBOOT2_TAG_INFO_REQ
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| 53 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 54 | .long tag_info_req_end - tag_info_req_start
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| 55 | .long MULTIBOOT2_TAG_MODULE
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| 56 | .long MULTIBOOT2_TAG_MEMMAP
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| 57 | #ifdef CONFIG_FB
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| 58 | .long MULTIBOOT2_TAG_FBINFO
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| 59 | #endif
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| 60 | tag_info_req_end:
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| 61 |
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| 62 | /* Address tag */
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| 63 | tag_address_start:
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| 64 | .word MULTIBOOT2_TAG_ADDRESS
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| 65 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 66 | .long tag_address_end - tag_address_start
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| 67 | .long multiboot2_header_start
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| 68 | .long unmapped_ktext_start
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| 69 | .long 0
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| 70 | .long 0
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| 71 | tag_address_end:
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| 72 |
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| 73 | /* Entry address tag */
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| 74 | tag_entry_address_start:
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| 75 | .word MULTIBOOT2_TAG_ENTRY_ADDRESS
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| 76 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 77 | .long tag_entry_address_end - tag_entry_address_start
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| 78 | .long multiboot2_image_start
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| 79 | tag_entry_address_end:
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| 80 |
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| 81 | /* Flags tag */
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| 82 | tag_flags_start:
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| 83 | .word MULTIBOOT2_TAG_FLAGS
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| 84 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 85 | .long tag_flags_end - tag_flags_start
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| 86 | .long MULTIBOOT2_FLAGS_CONSOLE
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| 87 | tag_flags_end:
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| 88 |
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| 89 | #ifdef CONFIG_FB
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| 90 | /* Framebuffer tag */
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| 91 | tag_framebuffer_start:
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| 92 | .word MULTIBOOT2_TAG_FRAMEBUFFER
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| 93 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 94 | .long tag_framebuffer_end - tag_framebuffer_start
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| 95 | .long CONFIG_BFB_WIDTH
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| 96 | .long CONFIG_BFB_HEIGHT
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| 97 | .long CONFIG_BFB_BPP
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| 98 | tag_framebuffer_end:
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| 99 | #endif
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| 100 |
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| 101 | /* Module alignment tag */
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| 102 | tag_module_align_start:
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| 103 | .word MULTIBOOT2_TAG_MODULE_ALIGN
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| 104 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 105 | .long tag_module_align_end - tag_module_align_start
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| 106 | .long 0
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| 107 | tag_module_align_end:
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| 108 |
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| 109 | /* Tag terminator */
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| 110 | tag_terminator_start:
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| 111 | .word MULTIBOOT2_TAG_TERMINATOR
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| 112 | .word MULTIBOOT2_FLAGS_REQUIRED
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| 113 | .long tag_terminator_end - tag_terminator_start
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| 114 | tag_terminator_end:
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| 115 | multiboot2_header_end:
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| 116 |
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| 117 | multiboot2_image_start:
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| 118 | cli
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| 119 | cld
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| 120 |
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| 121 | /* Initialize stack pointer */
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| 122 | movl $START_STACK, %esp
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| 123 |
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| 124 | /*
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| 125 | * Initialize Global Descriptor Table and
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| 126 | * Interrupt Descriptor Table registers
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| 127 | */
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| 128 | lgdtl bootstrap_gdtr
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| 129 | lidtl bootstrap_idtr
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| 130 |
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| 131 | /* Kernel data + stack */
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| 132 | movw $GDT_SELECTOR(KDATA_DES), %cx
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| 133 | movw %cx, %es
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| 134 | movw %cx, %ds
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| 135 | movw %cx, %ss
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| 136 |
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| 137 | /*
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| 138 | * Simics seems to remove hidden part of GS on entering user mode
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| 139 | * when _visible_ part of GS does not point to user-mode segment.
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| 140 | */
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| 141 | movw $GDT_SELECTOR(UDATA_DES), %cx
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| 142 | movw %cx, %fs
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| 143 | movw %cx, %gs
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| 144 |
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| 145 | jmpl $GDT_SELECTOR(KTEXT32_DES), $multiboot2_meeting_point
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| 146 | multiboot2_meeting_point:
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| 147 |
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| 148 | /*
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| 149 | * Protected 32-bit. We want to reuse the code-seg descriptor,
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| 150 | * the Default operand size must not be 1 when entering long mode.
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| 151 | */
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| 152 |
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| 153 | /* Save multiboot arguments */
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| 154 | movl %eax, multiboot_eax
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| 155 | movl %ebx, multiboot_ebx
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| 156 |
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| 157 | movl $(INTEL_CPUID_EXTENDED), %eax
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| 158 | cpuid
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| 159 | cmp $(INTEL_CPUID_EXTENDED), %eax
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| 160 | ja extended_cpuid_supported
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| 161 |
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| 162 | jmp pm_error_halt
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| 163 |
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| 164 | extended_cpuid_supported:
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| 165 |
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| 166 | movl $(AMD_CPUID_EXTENDED), %eax
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| 167 | cpuid
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| 168 | bt $(AMD_EXT_LONG_MODE), %edx
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| 169 | jc long_mode_supported
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| 170 |
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| 171 | jmp pm_error_halt
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| 172 |
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| 173 | long_mode_supported:
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| 174 |
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| 175 | bt $(AMD_EXT_NOEXECUTE), %edx
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| 176 | jc noexecute_supported
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| 177 |
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| 178 | jmp pm_error_halt
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| 179 |
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| 180 | noexecute_supported:
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| 181 |
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| 182 | movl $(INTEL_CPUID_STANDARD), %eax
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| 183 | cpuid
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| 184 | bt $(INTEL_FXSAVE), %edx
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| 185 | jc fx_supported
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| 186 |
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| 187 | jmp pm_error_halt
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| 188 |
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| 189 | fx_supported:
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| 190 |
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| 191 | bt $(INTEL_SSE2), %edx
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| 192 | jc sse2_supported
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| 193 |
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| 194 | jmp pm_error_halt
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| 195 |
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| 196 | sse2_supported:
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| 197 |
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| 198 | /*
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| 199 | * Enable 64-bit page translation entries - CR4.PAE = 1.
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| 200 | * Paging is not enabled until after long mode is enabled.
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| 201 | */
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| 202 |
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| 203 | movl %cr4, %eax
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| 204 | btsl $5, %eax
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| 205 | movl %eax, %cr4
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| 206 |
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| 207 | /* Set up paging tables */
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| 208 | leal ptl_0, %eax
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| 209 | movl %eax, %cr3
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| 210 |
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| 211 | /* Enable long mode */
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| 212 | movl $EFER_MSR_NUM, %ecx
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| 213 | rdmsr /* read EFER */
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| 214 | btsl $AMD_LME_FLAG, %eax /* set LME = 1 */
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| 215 | wrmsr
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| 216 |
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| 217 | /* Enable paging to activate long mode (set CR0.PG = 1) */
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| 218 | movl %cr0, %eax
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| 219 | btsl $31, %eax
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| 220 | movl %eax, %cr0
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| 221 |
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| 222 | /* At this point we are in compatibility mode */
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| 223 | jmpl $GDT_SELECTOR(KTEXT_DES), $start64
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| 224 |
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| 225 | pm_error_halt:
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| 226 | cli
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| 227 | hlt1:
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| 228 | hlt
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| 229 | jmp hlt1
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| 230 |
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| 231 | .code64
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| 232 |
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| 233 | start64:
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| 234 |
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| 235 | /*
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| 236 | * Long mode.
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| 237 | */
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| 238 |
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| 239 | movq $(PA2KA(START_STACK)), %rsp
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| 240 |
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| 241 | /* Create the first stack frame */
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| 242 | pushq $0
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| 243 | movq %rsp, %rbp
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| 244 |
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| 245 | /* Call arch_pre_main(multiboot_eax, multiboot_ebx) */
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| 246 | xorq %rdi, %rdi
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| 247 | movl multiboot_eax, %edi
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| 248 | xorq %rsi, %rsi
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| 249 | movl multiboot_ebx, %esi
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| 250 |
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| 251 | movabsq $arch_pre_main, %rax
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| 252 | callq *%rax
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| 253 |
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| 254 | /* Call main_bsp() */
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| 255 | movabsq $main_bsp, %rax
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| 256 | call *%rax
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| 257 |
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| 258 | /* Not reached */
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| 259 | cli
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| 260 | hlt0:
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| 261 | hlt
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| 262 | jmp hlt0
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