1 ; AcessOS Microkernel Version
6 KERNEL_BASE equ 0xC0000000
13 ; Multiboot macros to make a few lines later more readable
14 MULTIBOOT_PAGE_ALIGN equ 1<<0
15 MULTIBOOT_MEMORY_INFO equ 1<<1
16 MULTIBOOT_HEADER_MAGIC equ 0x1BADB002
17 MULTIBOOT_HEADER_FLAGS equ MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO
18 MULTIBOOT_CHECKSUM equ -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
20 ; This is the GRUB Multiboot header. A boot signature
21 dd MULTIBOOT_HEADER_MAGIC
22 dd MULTIBOOT_HEADER_FLAGS
24 dd mboot - KERNEL_BASE ;Location of Multiboot Header
28 ; MULTIBOOT2_HEADER_MAGIC equ 0xE85250D6
29 ; MULTIBOOT2_HEADER_ARCH equ 0
30 ; MULTIBOOT2_HEADER_LENGTH equ (mboot2_end-mboot2)
31 ; MULTIBOOT2_CHECKSUM equ -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT2_HEADER_ARCH + MULTIBOOT2_HEADER_LENGTH)
33 ; dd MULTIBOOT2_HEADER_MAGIC
34 ; dd MULTIBOOT2_HEADER_ARCH
35 ; dd MULTIBOOT2_HEADER_LENGTH
36 ; dd MULTIBOOT2_CHECKSUM
37 ; ; MBoot2 Address Header
40 ; dd mboot2 ; Location of Multiboot Header
41 ; dd __load_addr - KERNEL_BASE ; Kernel Load base
42 ; dd __bss_start - KERNEL_BASE ; Kernel Data End
43 ; dd gKernelEnd - KERNEL_BASE ; Kernel BSS End
44 ; ; MBoot2 Entry Point Tag
47 ; dd start - KERNEL_BASE
48 ; ; MBoot2 Module Alignment Tag
51 ; dd 0 ; Search me, seems it wants padding
63 mov esp, Kernel_Stack_Top
66 mov ecx, gaInitPageDir - KERNEL_BASE
70 or ecx, 0x80010000 ; PG and WP
73 lea ecx, [.higherHalf]
78 push ebx ; Multiboot Info
79 push eax ; Multiboot Magic Value
89 ; Multiprocessing AP Startup Code (Must be within 0x10FFF0)
95 [extern gpMP_LocalAPIC]
96 [extern gaAPIC_to_CPU]
98 [extern giNumInitingCPUs]
99 lGDTPtr: ; Local GDT Pointer
106 xchg bx, bx ; MAGIC BREAK!
109 lgdt [DWORD ds:lGDTPtr-KERNEL_BASE-0xFFFF0]
113 jmp 08h:DWORD .ProtectedMode-KERNEL_BASE
117 mov eax, gaInitPageDir - KERNEL_BASE
120 or eax, 0x80010000 ; PG and WP
122 ; Jump to higher half
123 lea eax, [.higherHalf]
126 ; Load True GDT & IDT
130 mov eax, [gpMP_LocalAPIC]
133 mov cl, BYTE [eax+0x10]
134 ; CL is now local APIC ID
135 mov cl, BYTE [gaAPIC_to_CPU+ecx]
136 ; CL is now the CPU ID
137 mov BYTE [gaCPUs+ecx*8+1], 1
138 ; Decrement the remaining CPU count
139 dec DWORD [giNumInitingCPUs]
140 ; CPU is now marked as initialised
152 ; int CallWithArgArray(void *Ptr, int NArgs, Uint *Args)
153 ; Call a function passing the array as arguments
154 [global CallWithArgArray]
158 mov ecx, [ebp+12] ; Get NArgs
162 mov eax, [edx+ecx*4-4]
173 [global gaInitPageDir]
174 [global gaInitPageTable]
177 dd gaInitPageTable-KERNEL_BASE+3 ; 0x00
178 times 1024-256-1 dd 0
179 dd gaInitPageTable-KERNEL_BASE+3 ; 0xC0
188 [global Kernel_Stack_Top]