1 ; AcessOS Microkernel Version
6 KERNEL_BASE equ 0xC0000000
14 ; Multiboot macros to make a few lines later more readable
15 MULTIBOOT_PAGE_ALIGN equ 1<<0
16 MULTIBOOT_MEMORY_INFO equ 1<<1
17 MULTIBOOT_HEADER_MAGIC equ 0x1BADB002
18 MULTIBOOT_HEADER_FLAGS equ MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO
19 MULTIBOOT_CHECKSUM equ -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
21 ; This is the GRUB Multiboot header. A boot signature
22 dd MULTIBOOT_HEADER_MAGIC
23 dd MULTIBOOT_HEADER_FLAGS
25 dd mboot - KERNEL_BASE ;Location of Multiboot Header
29 ; MULTIBOOT2_HEADER_MAGIC equ 0xE85250D6
30 ; MULTIBOOT2_HEADER_ARCH equ 0
31 ; MULTIBOOT2_HEADER_LENGTH equ (mboot2_end-mboot2)
32 ; MULTIBOOT2_CHECKSUM equ -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT2_HEADER_ARCH + MULTIBOOT2_HEADER_LENGTH)
34 ; dd MULTIBOOT2_HEADER_MAGIC
35 ; dd MULTIBOOT2_HEADER_ARCH
36 ; dd MULTIBOOT2_HEADER_LENGTH
37 ; dd MULTIBOOT2_CHECKSUM
38 ; ; MBoot2 Address Header
41 ; dd mboot2 ; Location of Multiboot Header
42 ; dd __load_addr - KERNEL_BASE ; Kernel Load base
43 ; dd __bss_start - KERNEL_BASE ; Kernel Data End
44 ; dd gKernelEnd - KERNEL_BASE ; Kernel BSS End
45 ; ; MBoot2 Entry Point Tag
48 ; dd start - KERNEL_BASE
49 ; ; MBoot2 Module Alignment Tag
52 ; dd 0 ; Search me, seems it wants padding
64 mov esp, Kernel_Stack_Top
67 mov ecx, gaInitPageDir - KERNEL_BASE
71 or ecx, 0x80010000 ; PG and WP
74 lea ecx, [.higherHalf]
79 push ebx ; Multiboot Info
80 push eax ; Multiboot Magic Value
90 ; Multiprocessing AP Startup Code (Must be within 0x10FFF0)
96 [extern gpMP_LocalAPIC]
97 [extern giMP_TimerCount]
98 [extern gaAPIC_to_CPU]
100 [extern giNumInitingCPUs]
101 [extern MM_NewKStack]
103 lGDTPtr: ; Local GDT Pointer
116 ;xchg bx, bx ; MAGIC BREAK!
119 lgdt [DWORD ds:lGDTPtr-KERNEL_BASE-0xFFFF0]
123 jmp 08h:DWORD .ProtectedMode-KERNEL_BASE
126 ; Load segment registers
134 mov eax, gaInitPageDir - KERNEL_BASE
137 or eax, 0x80010000 ; PG and WP
139 ; Jump to higher half
140 lea eax, [.higherHalf]
143 ; Load True GDT & IDT
147 mov ebp, [gpMP_LocalAPIC]
148 mov ebx, [ebp+0x20] ; Read ID
150 ;xchg bx, bx ; MAGIC BREAK
151 ; CL is now local APIC ID
152 mov cl, BYTE [gaAPIC_to_CPU+ebx]
155 ; BL is now the CPU ID
156 mov BYTE [gaCPUs+ebx*8+1], 1
157 ; Decrement the remaining CPU count
158 dec DWORD [giNumInitingCPUs]
162 shl edx, 5+2 ; *32 *4
163 lea esp, [gInitAPStacks+edx]
168 lea ecx, [ebx*8+0x30]
170 ; Save the CPU number to a debug register
173 ;xchg bx, bx ; MAGIC_BREAK
175 mov DWORD [ebp+0x0F0], 0x000001EF ; Spurious Interrupt Vector (0xEF)
176 mov ecx, DWORD [giMP_TimerCount]
177 mov DWORD [ebp+0x380], ecx ; Set Initial Count
178 mov DWORD [ebp+0x320], 0x000200EE ; Enable timer on IVT#0xEE
179 mov DWORD [ebp+0x330], 0x000100E0 ; ##Enable thermal sensor on IVT#0xE0
180 mov DWORD [ebp+0x340], 0x000100D0 ; ##Enable performance counters on IVT#0xD0
181 mov DWORD [ebp+0x350], 0x000100D1 ; ##Enable LINT0 on IVT#0xD1
182 mov DWORD [ebp+0x360], 0x000100D2 ; ##Enable LINT1 on IVT#0xD2
183 mov DWORD [ebp+0x370], 0x000100E1 ; ##Enable Error on IVT#0xE1
184 mov DWORD [ebp+0x0B0], 0 ; Send an EOI (just in case)
186 ; CPU is now marked as initialised
188 ;xchg bx, bx ; MAGIC BREAK
199 ; int CallWithArgArray(void *Ptr, int NArgs, Uint *Args)
200 ; Call a function passing the array as arguments
201 [global CallWithArgArray]
205 mov ecx, [ebp+12] ; Get NArgs
209 mov eax, [edx+ecx*4-4]
220 [global gaInitPageDir]
221 [global gaInitPageTable]
224 dd gaInitPageTable-KERNEL_BASE+3 ; 0x00
225 times 1024-256-1 dd 0
226 dd gaInitPageTable-KERNEL_BASE+3 ; 0xC0
235 [global Kernel_Stack_Top]
240 times 32*MAX_CPUS dd 0