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| author | Michal Idziorek <m.i@gmx.at> | 2015-05-16 20:42:37 +0200 |
|---|---|---|
| committer | Michal Idziorek <m.i@gmx.at> | 2015-05-16 20:42:37 +0200 |
| commit | 3bac6dd02d640923646b8ad988f509f47adab57f (patch) | |
| tree | 42d91a578fba55f6e0e6e473644aa7941ae1863c /mp | |
| parent | ec6d07e29d1d55afe9d2c6f7f25e9fed20819af6 (diff) | |
working on smp support, strange things happening!?
Diffstat (limited to 'mp')
| -rw-r--r-- | mp/mp.asm | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/mp/mp.asm b/mp/mp.asm new file mode 100644 index 0000000..740a1a0 --- /dev/null +++ b/mp/mp.asm @@ -0,0 +1,84 @@ +; master boot record for application processors + +[org 0x7000] +[bits 16] + + + + cli ;switch off interrupts! + lgdt [gdt_descriptor] ;load descriptor table! + + ;switch on 32-bit protected mode + mov eax, cr0 + or eax,0x1 + mov cr0, eax + + jmp 0x8:init_pm + +[bits 32] + + +LLOCK: dd 0 + +init_pm: + + mov ax, 0x10 + mov ds, ax + mov ss, ax + mov es, ax + mov fs, ax + mov gs, ax + + mov ebp, 0x8000 + mov esp, ebp + + call boot_32_pm ;continue booting in 32-bit protected mode + +boot_32_pm: + + mov eax, 1 ; semaphore + xchg eax, [LLOCK] + cmp eax,1 + je $ + + call [0x8010] ;kernel_ap ;jump into our Kernel! + jmp $ ; should never be reached + + +gdt_start: + +gdt_null: ;null descriptor (2 x 4 bytes) + dd 0x0 + dd 0x0 + +gdt_code: + ; flags: + ; present: 1 / privilege: 00 / type: 1 + ; code: 1 / conforming: 0 / readable: 1 / accessed: 0 + ; granularity: 1 / 16-bit default: 1 / 64-bit seg: 0 / AVL: 0 + dw 0xffff ;limit + dw 0x0 ;base + db 0x0 ;base + db 10011010b ;flags + db 11001111b ;flags & seg.limit + db 0x0 ;base + +gdt_data: + ; flags: + ; code: 0 / expand down: 0 / writable: 1 / accessed: 0 + dw 0xffff + dw 0x0 + db 0x0 + db 10010010b + db 11001111b + db 0x0 + +gdt_end: + +gdt_descriptor: + dw gdt_end-gdt_start-1 + dd gdt_start + +CODE_SEG equ gdt_code - gdt_start +DATA_SEG equ gdt_data - gdt_start + |