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
60 [extern Desctab_Install]
63 ; Just show we're here
64 mov WORD [0xB8000], 0x0741 ; 'A'
67 mov esp, Kernel_Stack_Top
70 mov ecx, gaInitPageDir - KERNEL_BASE
73 or ecx, 0x80010000 ; PG and WP
76 mov WORD [0xB8002], 0x0763 ; 'c'
80 mov cx, 0x10 ; PL0 Data
86 mov WORD [0xB8004], 0x0765 ; 'e'
90 mov WORD [0xB8006], 0x0773 ; 's'
92 push ebx ; Multiboot Info
93 push eax ; Multiboot Magic Value
94 ; NOTE: These are actually for kmain
97 mov WORD [0xB8008], 0x0773 ; 's'
100 mov WORD [0xB800A], 0x0732 ; '2'
110 ; Multiprocessing AP Startup Code (Must be within 0 - 0x10FFF0)
114 [extern gpMP_LocalAPIC]
115 [extern giMP_TimerCount]
116 [extern gaAPIC_to_CPU]
118 [extern giNumInitingCPUs]
119 [extern MM_NewKStack]
120 [extern Proc_InitialiseSSE]
122 lGDTPtr: ; Local GDT Pointer
133 [extern Proc_Reschedule]
136 ;xchg bx, bx ; MAGIC BREAK!
140 lgdt [DWORD ds:lGDTPtr-0xFFFF0]
141 ; Enable PMode in CR0
146 jmp 08h:DWORD .ProtectedMode
149 ; Load segment registers
157 mov eax, gaInitPageDir - KERNEL_BASE
160 or eax, 0x80010000 ; PG and WP
162 ; Jump to higher half
163 lea eax, [.higherHalf]
166 ; Load True GDT & IDT
170 mov ebp, [gpMP_LocalAPIC]
171 mov ebx, [ebp+0x20] ; Read ID
173 ;xchg bx, bx ; MAGIC BREAK
174 ; BL is now local APIC ID
175 mov cl, BYTE [gaAPIC_to_CPU+ebx]
178 ; BL is now the CPU ID
179 mov dr1, ebx ; Save the CPU number to a debug register
181 mov BYTE [gaCPUs+ebx*8+1], 1
182 ; Decrement the remaining CPU count
183 dec DWORD [giNumInitingCPUs]
187 shl edx, 5+2 ; *32 *4
188 lea esp, [gInitAPStacks+edx]
193 lea ecx, [ebx*8+0x30]
196 ;xchg bx, bx ; MAGIC_BREAK
198 mov DWORD [ebp+0x0F0], 0x000001EF ; Spurious Interrupt Vector (0xEF)
199 mov ecx, DWORD [giMP_TimerCount]
200 mov DWORD [ebp+0x380], ecx ; Set Initial Count
201 mov DWORD [ebp+0x320], 0x000200EE ; Enable timer on IVT#0xEE
202 mov DWORD [ebp+0x330], 0x000100E0 ; ##Enable thermal sensor on IVT#0xE0
203 mov DWORD [ebp+0x340], 0x000100D0 ; ##Enable performance counters on IVT#0xD0
204 mov DWORD [ebp+0x350], 0x000100D1 ; ##Enable LINT0 on IVT#0xD1
205 mov DWORD [ebp+0x360], 0x000100D2 ; ##Enable LINT1 on IVT#0xD2
206 mov DWORD [ebp+0x370], 0x000100E1 ; ##Enable Error on IVT#0xE1
207 mov DWORD [ebp+0x0B0], 0 ; Send an EOI (just in case)
209 ; Initialise SSE support
210 call Proc_InitialiseSSE
212 ; CPU is now marked as initialised
230 ; int CallWithArgArray(void *Ptr, int NArgs, Uint *Args)
231 ; Call a function passing the array as arguments
232 [global CallWithArgArray]
236 mov ecx, [ebp+12] ; Get NArgs
240 mov eax, [edx+ecx*4-4]
252 GDT_SIZE equ (1+2*2+1+MAX_CPUS)*8
257 dd 0x00000000, 0x00000000 ; 00 NULL Entry
258 dd 0x0000FFFF, 0x00CF9A00 ; 08 PL0 Code
259 dd 0x0000FFFF, 0x00CF9200 ; 10 PL0 Data
260 dd 0x0000FFFF, 0x00CFFA00 ; 18 PL3 Code
261 dd 0x0000FFFF, 0x00CFF200 ; 20 PL3 Data
262 dd 26*4-1, 0x00408900 ; 28 Double Fault TSS
263 times MAX_CPUS dd 26*4-1, 0x00408900 ; 30+ TSSes
270 [global gaInitPageDir]
271 [global gaInitPageTable]
274 dd gaInitPageTable-KERNEL_BASE+3 ; 0x000 - Low kernel
275 times 0x300-0x000-1 dd 0
276 dd gaInitPageTable-KERNEL_BASE+3 ; 0xC00 - High kernel
277 times 0x3F0-0x300-1 dd 0
278 dd gaInitPageDir-KERNEL_BASE+3 ; 0xFC0 - Fractal
279 times 0x400-0x3F0-1 dd 0
287 [global Kernel_Stack_Top]
292 times 32*MAX_CPUS dd 0