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1 changed files with 53 additions and 51 deletions
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@ -81,11 +81,11 @@ GDT64: ; Global Descriptor Table (64-bit).
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dw $ - GDT64 - 1 ; Limit.
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dq GDT64 ; Base.
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times 256 DD 0 ; stack for booting
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times 256 DD 0 ; Stack for booting
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startup_stack:
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SECTION .data
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; create default page tables for the 64bit kernel
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; Create default page tables for the 64bit kernel
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global boot_pml4
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ALIGN 4096 ; of course, the page tables have to be page aligned
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@ -102,37 +102,37 @@ ALIGN 8
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%if MAX_CORES > 1
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global smp_entry
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smp_entry:
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; initialize cpu features
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; Initialize cpu features
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call cpu_init
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; initialize cr3 register
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; Initialize cr3 register
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mov edi, boot_pml4
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mov cr3, edi
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; enable PAE
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; Enable PAE
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mov eax, cr4
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or eax, 1 << 5
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mov cr4, eax
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; enable longmode (compatibility mode)
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; Enable longmode (compatibility mode)
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mov ecx, 0xC0000080
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rdmsr
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or eax, 1 << 8
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wrmsr
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; enable paging
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; Enable paging
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mov eax, cr0
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or eax, 1 << 31 | 1 << 0 ; Set the PG-bit, which is the 31nd bit, and the PE-bit, which is the 0th bit.
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mov cr0, eax ; According to the multiboot spec the PE-bit has to be set by bootloader already!
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or eax, 1 << 31 | 1 << 0 ; Set the PG-bit, which is the 31nd bit, and the PE-bit, which is the 0th bit.
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mov cr0, eax ; According to the multiboot spec the PE-bit has to be set by bootloader already!
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; jump to 64-bit longmode
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mov edi, [esp+4] ; set argumet for smp_start
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; Jump to 64-bit longmode
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mov edi, [esp+4] ; Set argumet for smp_start
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lgdt [GDT64.Pointer] ; Load the 64-bit global descriptor table.
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jmp GDT64.Code:smp_start64 ; Set the code segment and enter 64-bit long mode.
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jmp $ ; endless loop
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%endif
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; search MP Floating Pointer Structure
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; Search MP Floating Pointer Structure
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search_mps:
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push ebp
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mov ebp, esp
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@ -164,7 +164,7 @@ search_mps:
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ret
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check_longmode:
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; check for cpuid instruction
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; Check for cpuid instruction
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pushfd
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pop eax
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mov ecx, eax
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@ -177,12 +177,12 @@ check_longmode:
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popfd
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xor eax, ecx
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jz .unsupported
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; check for extended cpu features (cpuid > 0x80000000)
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; Check for extended cpu features (cpuid > 0x80000000)
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mov eax, 0x80000000
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cpuid
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cmp eax, 0x80000001
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jb .unsupported ; It is less, there is no long mode.
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; check if longmode is supported
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; Check if longmode is supported
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mov eax, 0x80000001
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cpuid
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test edx, 1 << 29 ; Test if the LM-bit, which is bit 29, is set in the D-register.
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@ -201,7 +201,7 @@ check_lapic:
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and edx, 0x200
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cmp edx, 0
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je .unsupported
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; map lapic at 0xFEE00000 below the kernel
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; Map lapic at 0xFEE00000 below the kernel
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mov edi, kernel_start - 0x1000
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shr edi, 9 ; (edi >> 12) * 8
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add edi, boot_pgt
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@ -217,12 +217,12 @@ check_lapic:
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cpu_init:
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mov eax, cr0
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; enable caching, disable paging and fpu emulation
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; Enable caching, disable paging and fpu emulation
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and eax, 0x1ffffffb
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; ...and turn on FPU exceptions
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or eax, 0x22
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mov cr0, eax
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; clears the current pgd entry
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; Clear the current pgd entry
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xor eax, eax
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mov cr3, eax
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; at this stage, we disable the SSE support
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@ -231,18 +231,20 @@ cpu_init:
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mov cr4, eax
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ret
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; identity map a single page at address eax
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; Identity map a single page at address eax
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identity_page:
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push edi
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push ebx
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and eax, 0xFFFFF000
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mov edi, eax
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and edi, 0xFFFFF000 ; page align in lower half
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shr edi, 9 ; (edi >> 12) * 8 (index for boot_pgt)
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add edi, boot_pgt
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mov ebx, eax
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or ebx, 0x113 ; set present, global, writable and cache disable bits
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and ebx, 0xFFFFF000 ; page align lower half
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or ebx, 0x113 ; set present, global, writable and cache disable bits
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mov DWORD [edi], ebx
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mov DWORD [edi+4], 0x80000000 ; set execution disable bit in higher half
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pop ebx
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pop edi
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@ -251,16 +253,16 @@ identity_page:
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ALIGN 4
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stublet:
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mov esp, startup_stack-4
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; save pointer to the Multiboot structure
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; Save pointer to the Multiboot structure
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push ebx
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; initialize cpu features
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; Initialize cpu features
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call cpu_init
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; check if longmode is supported
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; Check if longmode is supported
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call check_longmode
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; check if lapic is available
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; Check if lapic is available
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call check_lapic
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; find MP Floating Pointer structure
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; Find MP Floating Pointer structure
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push DWORD 0x100000
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push DWORD 0xF0000
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call search_mps
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@ -278,22 +280,22 @@ stublet:
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je map_kernel
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map_mps:
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; map MP Floating Pointer structure
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; Map MP Floating Pointer structure
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mov DWORD [apic_mp], eax
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call identity_page
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; map MP Configuration table
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mov eax, [apic_mp+4]
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; Map MP Configuration table
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mov eax, [eax+4] ; Offset for physical address of MP table
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call identity_page
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%ifdef CONFIG_VGA
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; map VGA textmode plane
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; Map VGA textmode plane
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mov eax, 0xB8000
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call identity_page
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%endif
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; map Multiboot structure
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mov eax, [esp] ; pointer is still on the stack
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; Map Multiboot structure
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mov eax, [esp] ; Pointer is still on the stack
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call identity_page
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map_kernel:
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@ -317,67 +319,67 @@ init_paging:
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mov cr3, edi
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mov DWORD [edi], boot_pdpt
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or DWORD [edi], 0x07 ; set present, user and writable flags
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or DWORD [edi], 0x03 ; Set present and writable flags
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mov edi, boot_pdpt
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mov DWORD [edi], boot_pgd
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or DWORD [edi], 0x03 ; set present and writable flags
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or DWORD [edi], 0x03 ; Set present and writable flags
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mov edi, boot_pgd
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mov ebx, boot_pgt
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mov ecx, PAGE_MAP_ENTRIES ; map all boot_pgt to the kernel space
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mov ecx, PAGE_MAP_ENTRIES ; Map all boot_pgt to the kernel space
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.l1:
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mov DWORD [edi], ebx
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or DWORD [edi], 0x03 ; set present and writable flags
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or DWORD [edi], 0x03 ; Set present and writable flags
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add edi, 8
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add ebx, 0x1000
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loop .l1
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; enable PAE
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; Enable PAE
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mov eax, cr4
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or eax, 1 << 5
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mov cr4, eax
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; enable longmode (compatibility mode)
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; Enable longmode (compatibility mode)
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mov ecx, 0xC0000080
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rdmsr
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or eax, 1 << 8
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or eax, 1 << 8 ; IA32_EFER.LME = 1
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wrmsr
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; enable paging
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; Enable paging
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mov eax, cr0
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or eax, 1 << 31 | 1 << 0 ; Set the PG-bit, which is the 31nd bit, and the PE-bit, which is the 0th bit.
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or eax, 1 << 31 | 1 << 0 ; Set the PG-bit, which is the 31nd bit, and the PE-bit, which is the 0th bit.
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mov cr0, eax
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; jump to 64-bit longmode
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pop ebx ; restore pointer to multiboot structure
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lgdt [GDT64.Pointer] ; Load the 64-bit global descriptor table.
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jmp GDT64.Code:start64 ; Set the code segment and enter 64-bit long mode.
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; Jump to 64-bit longmode
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pop ebx ; Restore pointer to multiboot structure
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lgdt [GDT64.Pointer] ; Load the 64-bit global descriptor table.
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jmp GDT64.Code:start64 ; Set the code segment and enter 64-bit long mode.
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[BITS 64]
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start64:
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; initialize segment registers
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; Initialize segment registers
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mov ax, GDT64.Data
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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mov ss, ax
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; set default stack pointer
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; Set default stack pointer
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mov rsp, boot_stack
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add rsp, KERNEL_STACK_SIZE-16
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; interpret multiboot information
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; Interpret multiboot information
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extern multiboot_init
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mov rdi, rbx
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call multiboot_init
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; jump to the boot processors's C code
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; Jump to the boot processors's C code
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extern main
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call main
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jmp $
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%if MAX_CORES > 1
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smp_start64:
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; initialize segment registers
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; Initialize segment registers
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mov ax, GDT64.Data
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mov ds, ax
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mov es, ax
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@ -385,7 +387,7 @@ smp_start64:
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mov gs, ax
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mov ss, ax
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; jump to the boot processors's C code
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; Jump to the boot processors's C code
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extern smp_start
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call smp_start
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jmp $
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