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x86_64 boot problems :)
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| check_exception old: 0xffffffff new 0xe | |
| 0: v=0e e=0000 i=0 cpl=0 IP=0010:00000000004000a6 pc=00000000004000a6 SP=0018:000000000040f000 CR2=00000000004000a6 | |
| EAX=80000011 EBX=00100400 ECX=c0000080 EDX=00000000 | |
| ESI=00000001 EDI=00000000 EBP=00000000 ESP=0040f000 | |
| EIP=004000a6 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 | |
| ES =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| CS =0010 00000000 ffffffff 00cf9a00 DPL=0 CS32 [-R-] | |
| SS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| DS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| FS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| GS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT | |
| TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS64-busy | |
| GDT= 00000000000010b0 00000020 | |
| IDT= 0000000000000000 00000000 | |
| CR0=80000011 CR2=00000000004000a6 CR3=0000000000406000 CR4=00000020 | |
| DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 | |
| DR6=00000000ffff0ff0 DR7=0000000000000400 | |
| CCS=00000001 CCD=00000100 CCO=LOGICL | |
| EFER=0000000000000500 | |
| check_exception old: 0xe new 0xd | |
| 1: v=08 e=0000 i=0 cpl=0 IP=0010:00000000004000a6 pc=00000000004000a6 SP=0018:000000000040f000 env->regs[R_EAX]=0000000080000011 | |
| EAX=80000011 EBX=00100400 ECX=c0000080 EDX=00000000 | |
| ESI=00000001 EDI=00000000 EBP=00000000 ESP=0040f000 | |
| EIP=004000a6 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 | |
| ES =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| CS =0010 00000000 ffffffff 00cf9a00 DPL=0 CS32 [-R-] | |
| SS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| DS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| FS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| GS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT | |
| TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS64-busy | |
| GDT= 00000000000010b0 00000020 | |
| IDT= 0000000000000000 00000000 | |
| CR0=80000011 CR2=00000000004000a6 CR3=0000000000406000 CR4=00000020 | |
| DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 | |
| DR6=00000000ffff0ff0 DR7=0000000000000400 | |
| CCS=00000001 CCD=00000100 CCO=LOGICL | |
| EFER=0000000000000500 | |
| check_exception old: 0x8 new 0xd | |
| SMM: enter | |
| EAX=00000001 EBX=0000000b ECX=02000000 EDX=02000628 | |
| ESI=00000000 EDI=02000000 EBP=00000007 ESP=00006d78 | |
| EIP=000ee460 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0 | |
| ES =0010 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| CS =0008 00000000 ffffffff 00cf9b00 DPL=0 CS32 [-RA] | |
| SS =0010 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| DS =0010 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| FS =0010 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| GS =0010 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT | |
| TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy | |
| GDT= 000f7080 00000037 | |
| IDT= 000f70be 00000000 | |
| CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000 | |
| DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 | |
| DR6=00000000ffff0ff0 DR7=0000000000000400 | |
| CCS=00000080 CCD=00000001 CCO=LOGICB | |
| EFER=0000000000000000 |
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| // Taken from http://ringzeroandlower.com/2017/08/08/x86-64-kernel-boot.html | |
| #include "arch/x86_64/gdt.h" | |
| #include "arch/x86_64/mmu.h" | |
| #include "arch/x86_64/msr.h" | |
| #include "arch/x86_64/kernel.h" | |
| #include "arch/x86_64/sizes.h" | |
| #include "arch/x86_64/multiboot2.h" | |
| .set HEADER_LENGTH, header_end - header_start | |
| .set CHECKSUM, -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT_ARCHITECTURE_I386 + HEADER_LENGTH) | |
| .section .multiboot, "ax" | |
| header_start: | |
| .long MULTIBOOT2_HEADER_MAGIC | |
| .long MULTIBOOT_ARCHITECTURE_I386 | |
| .long HEADER_LENGTH | |
| .long CHECKSUM | |
| // multiboot tags go here | |
| .short MULTIBOOT_HEADER_TAG_END | |
| .short 0 // flags, none set | |
| .long 8 // size, including itself (short + short + long) | |
| header_end: | |
| .code32 | |
| .section .bss | |
| .comm pml4, PML4_SIZE, PML4_ALIGNMENT | |
| .comm low_pdpt, PDPT_SIZE, PDPT_ALIGNMENT | |
| .comm high_pdpt, PDPT_SIZE, PDPT_ALIGNMENT | |
| .comm low_page_directory_table, PAGE_DIRECTORY_SIZE, PAGE_DIRECTORY_ALIGNMENT | |
| .comm high_page_directory_table, PAGE_DIRECTORY_SIZE, PAGE_DIRECTORY_ALIGNMENT | |
| .comm tmp_stack, KERNEL_BOOT_STACK_SIZE, KERNEL_BOOT_STACK_ALIGNMENT | |
| .data | |
| .align GDT_TABLE_ALIGNMENT | |
| gdt_table: | |
| .8byte GDT_FIRST_ENTRY | |
| .8byte GDT_KERNEL_ENTRY | |
| gdt_table_end: | |
| .skip (GDT_TABLE_SIZE - (gdt_table_end - gdt_table)) | |
| gdt_ptr: | |
| .short GDT_TABLE_SIZE - 1 | |
| .long gdt_table | |
| .section .text, "ax" | |
| .global _start | |
| .type _start, @function | |
| _start: | |
| movl $tmp_stack + KERNEL_BOOT_STACK_SIZE, %esp | |
| movl $low_pdpt, %eax | |
| or $(MMU_PRESENT | MMU_WRITABLE), %eax | |
| movl %eax, pml4 + (PML4_ADDR_TO_ENTRY_INDEX(KERNEL_PHYSICAL_START) * PML4_ENTRY_SIZE) | |
| movl $high_pdpt, %eax | |
| or $(MMU_PRESENT | MMU_WRITABLE), %eax | |
| movl %eax, pml4 + (PML4_ADDR_TO_ENTRY_INDEX(KERNEL_VIRTUAL_START) * PML4_ENTRY_SIZE) | |
| movl $low_page_directory_table, %eax | |
| or $(MMU_PRESENT | MMU_WRITABLE), %eax | |
| movl %eax, low_pdpt + (PDPT_ADDR_TO_ENTRY_INDEX(KERNEL_PHYSICAL_START) * PDPT_ENTRY_SIZE) | |
| movl $high_page_directory_table, %eax | |
| or $(MMU_PRESENT | MMU_WRITABLE), %eax | |
| movl %eax, high_pdpt + (PDPT_ADDR_TO_ENTRY_INDEX(KERNEL_VIRTUAL_START) * PDPT_ENTRY_SIZE) | |
| mov $0, %ecx | |
| movl $_kernel_physical_end, %esi | |
| shrl $TWO_MEGABYTES_SHIFT, %esi | |
| addl $1, %esi | |
| page_directory_table_loop: | |
| movl $TWO_MEGABYTES, %eax | |
| mul %ecx | |
| or $(MMU_PRESENT | MMU_WRITABLE | MMU_PDE_TWO_MB), %eax | |
| movl %eax, low_page_directory_table(, %ecx, PAGE_DIRECTORY_ENTRY_SIZE) | |
| movl %eax, high_page_directory_table(, %ecx, PAGE_DIRECTORY_ENTRY_SIZE) | |
| inc %ecx | |
| cmp %esi, %ecx | |
| jne page_directory_table_loop // if not equal redo loop | |
| movl $pml4, %eax | |
| movl %eax, %cr3 | |
| movl $KERNEL_CR4, %eax | |
| movl %eax, %cr4 | |
| movl $MSR_EFER, %ecx | |
| rdmsr | |
| or $MSR_EFER_LME, %eax | |
| wrmsr | |
| movl $KERNEL_CR0, %eax | |
| // This is the last place that hangs and doesn't bootloop | |
| // 1: | |
| // jmp 1b | |
| movl %eax, %cr0 // <-------- crash | |
| lgdt gdt_ptr | |
| ljmp $(KERNEL_GDT_ENTRY * GDT_ENTRY_SIZE), $_start64 | |
| cli | |
| hlt | |
| .code64 | |
| .global _start64 | |
| .type _start64, @function | |
| _start64: | |
| // Setup segment selectors | |
| movw $0, %ax | |
| movw %ax, %ds | |
| movw %ax, %es | |
| movw %ax, %fs | |
| movw %ax, %gs | |
| movw %ax, %ss | |
| call kernel_main | |
| // Should never reach here | |
| cli | |
| hlt | |
| 1: | |
| jmp 1b |
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| (qemu) info registers | |
| EAX=80000011 EBX=00100400 ECX=c0000080 EDX=00000000 | |
| ESI=00000001 EDI=00000000 EBP=00000000 ESP=0040f000 | |
| EIP=004000a3 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 | |
| ES =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| CS =0010 00000000 ffffffff 00cf9a00 DPL=0 CS32 [-R-] | |
| SS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| DS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| FS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| GS =0018 00000000 ffffffff 00cf9300 DPL=0 DS [-WA] | |
| LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT | |
| TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy | |
| GDT= 000010b0 00000020 | |
| IDT= 00000000 00000000 | |
| CR0=00000011 CR2=00000000 CR3=00406000 CR4=00000020 | |
| DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 | |
| DR6=00000000ffff0ff0 DR7=0000000000000400 | |
| EFER=0000000000000100 | |
| FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 | |
| FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 | |
| FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 | |
| FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 | |
| FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 | |
| XMM00=00000000000000000000000000000000 XMM01=00000000000000000000000000000000 | |
| XMM02=00000000000000000000000000000000 XMM03=00000000000000000000000000000000 | |
| XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000 | |
| XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000 | |
| (qemu) x/64x 0x406000 | |
| 0000000000406000: 0x00405003 0x00000000 0x00000000 0x00000000 | |
| 0000000000406010: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000406020: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000406030: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000406040: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000406050: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000406060: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000406070: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000406080: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000406090: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004060a0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004060b0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004060c0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004060d0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004060e0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004060f0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| (qemu) x/64x 0x405000 | |
| 0000000000405000: 0x00404003 0x00000000 0x00000000 0x00000000 | |
| 0000000000405010: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000405020: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000405030: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000405040: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000405050: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000405060: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000405070: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000405080: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000405090: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004050a0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004050b0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004050c0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004050d0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004050e0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004050f0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| (qemu) x/64x 0x404000 | |
| 0000000000404000: 0x00000083 0x00000000 0x00000000 0x00000000 | |
| 0000000000404010: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000404020: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000404030: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000404040: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000404050: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000404060: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000404070: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000404080: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 0000000000404090: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004040a0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004040b0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004040c0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004040d0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004040e0: 0x00000000 0x00000000 0x00000000 0x00000000 | |
| 00000000004040f0: 0x00000000 0x00000000 0x00000000 0x00000000 |
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| #pragma once | |
| #include "arch/x86_64/control_register.h" | |
| // START macros must have the same value in the kernel linker script | |
| #define KERNEL_PHYSICAL_START 0x0000000000400000 | |
| #define KERNEL_VIRTUAL_START 0xFFFFFFFF80400000 | |
| #define KERNEL_GDT_ENTRY 1 | |
| #define KERNEL_CR0 \ | |
| ( \ | |
| CONTROL_REGISTER0_PAGE | \ | |
| CONTROL_REGISTER0_PROTECTED_MODE_ENABLED | \ | |
| CONTROL_REGISTER0_EXTENSION_TYPE \ | |
| ) | |
| #define KERNEL_CR4 (CONTROL_REGISTER4_PHYSICAL_ADDRESS_EXTENSION) | |
| #define KERNEL_BOOT_STACK_SIZE 0x8000 | |
| #define KERNEL_BOOT_STACK_ALIGNMENT 0x1000 |
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| COMMON_FLAGS=-target x86_64-pc-none-elf -O2 -march=x86-64 -Iinclude -mcmodel=large -ffreestanding -mno-mmx -mno-sse -mno-sse2 -fno-builtin -nostdlib -fPIC -mno-red-zone -DARCH_X86_64 -Wall -Wextra | |
| CFLAGS=$(COMMON_FLAGS) -flto=thin -ffunction-sections -fdata-sections -fPIC | |
| LDFLAGS=$(COMMON_FLAGS) -fno-pie -no-pie -flto=thin -fuse-ld=lld | |
| # ... | |
| build/%.c.bc: %.c | |
| mkdir -p $$(dirname $@) | |
| clang $(CFLAGS) -c $< -o $@ | |
| build/%.c.o: build/%.c.bc | |
| mkdir -p $$(dirname $@) | |
| clang $(CFLAGS) -c $< -o $@ | |
| build/%.S.o: %.S | |
| mkdir -p $$(dirname $@) | |
| clang $(CFLAGS) -c $< -o $@ | |
| build/kernel: $(OBJS) | |
| ld.lld -T kernel.ld -v $^ -o $@ | |
| # ... | |
| run: | |
| qemu-system-x86_64 -drive format=raw,file=build/kernel.img -monitor stdio -m 1024M |
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