192 lines
3.3 KiB
ArmAsm
Executable File
192 lines
3.3 KiB
ArmAsm
Executable File
.section .multiboot
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/*
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* Define constants for the multiboot header. See Multiboot 2 Specifications for details.
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*/
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.set align, 1<<0
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.set meminfo, 1<<1
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.set magic, 0xE85250D6
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.set arch, 0
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.set headerLength, _multibootHeaderEnd - _multibootHeaderStart
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.set checksum, -(magic + arch + headerLength)
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.set tagNotOptional, 0
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.set tagInfoRequestType, 1
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.set tagInfoRequestSize, _multibootInfoTagEnd - _multibootInfoTagStart
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.set requestBootCommand, 1
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.set requestBootLoaderName, 2
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.set requestBootModules, 3
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.set requestMemoryInfo, 4
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.set requestBootDevice, 5
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.set requestMemoryMap, 6
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.set tagAddressType, 2
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.set tagAddressSize, 24
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.set tagAddressHeaderLocation, LOAD_START
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.set tagAddressLoadStart, LOAD_START
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.set tagAddressLoadEnd, LOAD_END
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.set tagAddressBSSEnd, BSS_END
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.set tagEntryType, 3
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.set tagEntrySize, 12
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.set tagEntryAddress, _start - (0xFF900000 - 0x100000)
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.set tagModuleAlignType, 6
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.set tagModuleAlignSize, 8
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/*
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* Each multiboot tag must be 8-byte aligned, or GRUB will not be able to read the header.
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*/
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.align 8
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_multibootHeaderStart:
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.long magic
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.long arch
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.long headerLength
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.long checksum
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.align 8
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_multibootInfoTagStart:
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.short tagInfoRequestType
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.short tagNotOptional
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.long tagInfoRequestSize
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.long requestBootCommand
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.long requestBootLoaderName
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.long requestBootModules
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.long requestMemoryInfo
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.long requestBootDevice
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.long requestMemoryMap
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_multibootInfoTagEnd:
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.align 8
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.short tagAddressType
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.short tagNotOptional
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.long tagAddressSize
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.long tagAddressHeaderLocation
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.long tagAddressLoadStart
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.long tagAddressLoadEnd
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.long tagAddressBSSEnd
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.align 8
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.short tagEntryType
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.short tagNotOptional
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.long tagEntrySize
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.long tagEntryAddress
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.align 8
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.short tagModuleAlignType
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.short tagNotOptional
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.long tagModuleAlignSize
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.align 8
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/*
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* Terminate list of multiboot header tags.
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* Ending tag has type = 0, flags = 0, size = 8
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*/
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.long 0
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.long 8
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_multibootHeaderEnd:
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.section .bss
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.align 16
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stackBottom:
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.skip 8192
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stackTop:
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.align 4096
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_tempPgDir:
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.skip 4096
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_tempIdentityMap:
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.skip 4096
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_tempPgTable:
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.skip 4096
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_bootCmdLine:
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.skip 64
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.align 64
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.global system_info
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system_info:
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.skip 16
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.align 64
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.global memory_map
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memory_map:
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.skip 16 * 16
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.section .text
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.global _start
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.type _start, @function
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_start:
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cli
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# This platform reqires a Multiboot2 bootloader.
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cmp $0x36d76289, %eax
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jne .err
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# Initialize stack in physical address space
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mov $stackTop, %esp
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sub $BASE_DIFF, %esp
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# Push physical address of identity map
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mov $_tempIdentityMap, %eax
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sub $BASE_DIFF, %eax
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push %eax
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# Push physical address of page table
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mov $_tempPgTable, %eax
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sub $BASE_DIFF, %eax
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push %eax
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# Push physical address of page directory
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mov $_tempPgDir, %eax
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sub $BASE_DIFF, %eax
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push %eax
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# Load physical address of startPaging()
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mov $start_paging, %eax
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sub $BASE_DIFF, %eax
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# Initialize paging
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call *%eax
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# Jump into mapped kernel binary
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lea 1f, %eax
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jmp *%eax
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1:
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# Flush TLB
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mov %cr3, %eax
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mov %eax, %cr3
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# Initialize stack in virtual memory
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mov $stackTop, %esp
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# Change EBX to point to the virtual address of the multiboot info
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# If the new pointer is out-of-bounds, error
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add $0xFF800000, %ebx
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cmp $0xFF800000, %ebx
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jl .err
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cmp $0xFFC00000, %ebx
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jge .err
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# Call initialize(void* multibootInfo)
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push %ebx
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call initialize
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.err:
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cli
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2: hlt
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jmp 2b
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.size _start, . - _start
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