| 33,55 → 33,45 |
|---|
| #include <arch/cpuid.h> |
| #include <arch/boot/boot.h> |
| |
| #define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE) |
| #define START_STACK_64 0xffffffff80007c00 |
| |
| # |
| # This is where we require any SPARTAN-kernel-compatible boot loader |
| # to pass control in real mode. |
| # |
| # Protected mode tables are statically initialised during compile |
| # time. So we can just load the respective table registers and |
| # switch to protected mode. |
| # |
| |
| #define START_STACK (BOOTSTRAP_OFFSET-0x400) |
| |
| .section K_TEXT_START, "ax" |
| .code16 |
| .global kernel_image_start |
| .global multiboot_image_start |
| kernel_image_start: |
| cli |
| xorw %ax,%ax |
| movw %ax,%ds |
| movw %ax,%es |
| movw %ax,%ss # initialize stack segment register |
| movl $(START_STACK), %esp # initialize stack pointer |
| |
| call memmap_arch_init |
| |
| movl $0x80000000, %eax |
| cpuid |
| cmp $0x80000000, %eax # any function > 80000000h? |
| jbe no_long_mode |
| movl $(AMD_CPUID_EXTENDED), %eax # Extended function code 80000001 |
| cpuid |
| bt $29, %edx # Test if long mode is supported. |
| jnc no_long_mode |
| |
| # Load gdtr, idtr |
| lgdt real_bootstrap_gdtr_boot |
| |
| movl %cr0,%eax |
| orl $0x1,%eax |
| movl %eax,%cr0 # switch to protected mode |
| |
| jmpl $gdtselector(KTEXT32_DES), $now_in_prot |
| |
| no_long_mode: |
| 1: |
| jmp 1b |
| |
| # .code16 |
| # .global kernel_image_start |
| # .global multiboot_image_start |
| # kernel_image_start: |
| # cli |
| # xorw %ax,%ax |
| # movw %ax,%ds |
| # movw %ax,%es |
| # movw %ax,%ss # initialize stack segment register |
| # movl $(START_STACK), %esp # initialize stack pointer |
| # |
| # call memmap_arch_init |
| # |
| # movl $0x80000000, %eax |
| # cpuid |
| # cmp $0x80000000, %eax # any function > 80000000h? |
| # jbe no_long_mode |
| # movl $(AMD_CPUID_EXTENDED), %eax # Extended function code 80000001 |
| # cpuid |
| # bt $29, %edx # Test if long mode is supported. |
| # jnc no_long_mode |
| # |
| # # Load gdtr, idtr |
| # lgdt real_bootstrap_gdtr_boot |
| # |
| # movl %cr0,%eax |
| # orl $0x1,%eax |
| # movl %eax,%cr0 # switch to protected mode |
| # |
| # jmpl $gdtselector(KTEXT32_DES), $now_in_prot |
| # |
| # no_long_mode: |
| # 1: |
| # jmp 1b |
| # |
| .code32 |
| .align 4 |
| multiboot_header: |
| 88,11 → 78,11 |
|---|
| .long MULTIBOOT_HEADER_MAGIC |
| .long MULTIBOOT_HEADER_FLAGS |
| .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
| .long multiboot_header + BOOT_OFFSET |
| .long unmapped_ktext_start + BOOT_OFFSET |
| .long multiboot_header |
| .long unmapped_ktext_start |
| .long 0 |
| .long 0 |
| .long multiboot_image_start + BOOT_OFFSET |
| .long multiboot_image_start |
| |
| multiboot_image_start: |
| movl $START_STACK, %esp # initialize stack pointer |
| 109,44 → 99,39 |
|---|
| jmpl $gdtselector(KTEXT_DES), $multiboot_meeting_point + BOOT_OFFSET |
| multiboot_meeting_point: |
| |
| hlt |
| |
| # Protected 32-bit. We want to reuse the code-seg descriptor, |
| # the Default operand size must not be 1 when entering long mode |
| now_in_prot: |
| # Set up stack & data descriptors |
| movw $gdtselector(KDATA_DES), %ax |
| movw %ax, %ds |
| movw %ax, %ss |
| |
| movb $0xd1, %al # enable A20 using the keyboard controller |
| outb %al, $0x64 |
| movb $0xdf, %al |
| outb %al, $0x60 |
| |
| # Protected 32-bit. We want to reuse the code-seg descriptor, |
| # the Default operand size must not be 1 when entering long mode |
| |
| pushl %ebx # save parameters from GRUB |
| pushl %eax |
| |
| # Enable 64-bit page transaltion entries - CR4.PAE = 1. |
| # Paging is not enabled until after long mode is enabled |
| |
| movl %cr4, %eax |
| btsl $5, %eax |
| movl %eax, %cr4 |
| |
| # Set up paging tables |
| |
| leal ptl_0, %eax |
| movl %eax, %cr3 |
| |
| # Enable long mode |
| movl $EFER_MSR_NUM, %ecx # EFER MSR number |
| rdmsr # Read EFER |
| btsl $AMD_LME_FLAG, %eax # Set LME=1 |
| wrmsr # Write EFER |
| |
| movl $EFER_MSR_NUM, %ecx # EFER MSR number |
| rdmsr # Read EFER |
| btsl $AMD_LME_FLAG, %eax # Set LME=1 |
| wrmsr # Write EFER |
| |
| # Enable paging to activate long mode (set CR0.PG=1) |
| |
| movl %cr0, %eax |
| btsl $31, %eax |
| movl %eax, %cr0 |
| |
| # At this point we are in compatibility mode |
| |
| jmpl $gdtselector(KTEXT_DES), $start64 |
| |
| .code64 |
| 153,16 → 138,10 |
|---|
| start64: |
| movq $(PA2KA(START_STACK)), %rsp |
| |
| # Copy kernel to higher physical memory |
| movq $BOOTSTRAP_OFFSET, %rsi |
| movq $BOOTSTRAP_OFFSET + BOOT_OFFSET, %rdi |
| movq $_hardcoded_kernel_size, %rcx |
| cld |
| rep movsb |
| call main_bsp # never returns |
| |
| call main_bsp # never returns |
| 1: |
| jmp 1b |
| cli |
| hlt |
| |
| .section K_DATA_START, "aw", @progbits |
| .align 4096 |
| 218,11 → 197,6 |
|---|
| .fill 510,8,0 |
| .quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT) |
| |
| .global real_bootstrap_gdtr_boot |
| real_bootstrap_gdtr_boot: |
| .word gdtselector(GDT_ITEMS) |
| .long KA2PA(gdt)-BOOT_OFFSET |
| |
| .global protected_bootstrap_gdtr |
| protected_bootstrap_gdtr: |
| .word gdtselector(GDT_ITEMS) |