Subversion Repositories Kolibri OS

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;;                                                              ;;

;; Copyright (C) KolibriOS team 2004-2008. All rights reserved. ;;

;; Distributed under terms of the GNU General Public License    ;;

;;                                                              ;;

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$Revision: 2425 $

MEM_WB	   equ 6	       ;write-back memory

MEM_WC	   equ 1	       ;write combined memory

MEM_UC	   equ 0	       ;uncached memory

; ======================================================================

align 4

preinit_mem:

; clear [CLEAN_ZONE..HEAP_BASE]

	   xor	 eax,eax

	   mov	 edi,CLEAN_ZONE 		; 0x280000 = ramdisk FAT ?

	   mov	 ecx,(HEAP_BASE-OS_BASE-CLEAN_ZONE) / 4

	   cld

	   rep	 stosd

; clear [0x40000..0x90000]

	   mov	 edi,0x50000			; 0x50000 is somewhere inside kernel code?

	   mov	 ecx,(0x90000-0x50000)/4

	   rep	 stosd

; clear undefined kernel globals

	   mov	 edi, endofcode-OS_BASE

	   mov	 ecx, (uglobals_size/4)+4

	   rep	 stosd

; save [0..0xffff]

	   xor	 esi, esi

	   mov	 edi, (BOOT_VAR - OS_BASE)		; low mem storage area

	   mov	 ecx, 0x10000 / 4

	   rep	 movsd

; clear [0x1000..0x0ffff]

	   mov	 edi,0x1000

	   mov	 ecx,0xf000 / 4

	   rep	 stosd

; clear  table

	   mov edi, sys_pgdir-OS_BASE

	   mov ecx, 4096/4

	   rep stosd

	ret

; ======================================================================

align 4

init_mem:

	   mov	ecx, 0xC001001A 			; Top of Memory MSR

	   xor	edi, edi

	   rdmsr

	   mov	esi, eax				; esi = total amount of memory

	   mov	ecx, 0x0200

.read_mtrr:

	   rdmsr

	   and	eax, 0xFFF00000 			; not just bitcleaning

	   jz	.next_mtrr				; ignore the main memory and free MTRRs

	   cmp	esi, eax

	   jb	.next_mtrr				; ignore MMIO blocks

	   mov	esi, eax

.next_mtrr:

	   add	cl, 2

	   cmp	cl, 0x10

	   jb	.read_mtrr

	   mov	eax, USER_DMA_SIZE

	   sub	esi, eax				; exclude the Global DMA block...

	   and	esi, 0xFF800000 			; ...and the hole above it

	   mov	eax, esi

	   mov	[MEM_AMOUNT-OS_BASE], eax

	   mov	[pg_data.mem_amount-OS_BASE], eax	; the true MEMTOP

	   mov	[UserDMAaddr-OS_BASE], eax

	   shr esi, 12

	   mov [pg_data.pages_count-OS_BASE], esi	; max number of PTEs   ?

	   mov edx, esi 				; edx will hold maximum allocatable address

	   shr edx, 3

	   mov [pg_data.pagemap_size-OS_BASE], edx	; size of sys_pgmap structure

	   add edx, (sys_pgmap-OS_BASE)+4095

	   and edx, not 4095

	   mov [tmp_page_tabs], edx			; free zone to build PTEs for all available memory

	   mov edx, (HEAP_BASE-OS_BASE+HEAP_MIN_SIZE)/4096

	   mov [pg_data.kernel_pages -OS_BASE], edx

	   shr edx, 10

	   mov [pg_data.kernel_tables-OS_BASE], edx	; number of Kernel PDEs needed

	   mov edx, (sys_pgdir-OS_BASE)+ 0x800		; (0x800 = OS_BASE shr 20)

	   mov ebx, cr4

	   or  ebx, CR4_PSE

	   mov eax, PG_LARGE+PG_SW

	   mov cr4, ebx

	   dec [pg_data.kernel_tables-OS_BASE]

	   mov [edx], eax				; map first (physical) 4M bytes

	   add edx, 4

	   mov edi, [tmp_page_tabs]

	   mov ecx, [pg_data.kernel_pages -OS_BASE]	; safety cleaning of already-zeroed space

	   xor eax, eax

	   rep stosd

	   mov ecx, [pg_data.kernel_tables-OS_BASE]	; build some PDEs to hold empty PTEs

	   mov eax, [tmp_page_tabs]

	   or  eax, PG_SW

	   mov edi, edx 		; edi = sys_pgdir+0x804

.map_kernel_tabs:

	   stosd

	   add eax, 0x1000

	   dec ecx

	   jnz .map_kernel_tabs

; map pagetables to linear space

	   mov dword [sys_pgdir-OS_BASE+(page_tabs shr 20)], sys_pgdir+PG_SW-OS_BASE

	   mov edi, (sys_pgdir-OS_BASE)

	   lea esi, [edi+(OS_BASE shr 20)]

	   movsd

	   movsd

init_page_map:

; mark all memory as available

	   mov edi, sys_pgmap-OS_BASE

	   mov ecx, [pg_data.pagemap_size-OS_BASE]

	   shr ecx, 2

	   mov eax, -1

	   cld

	   rep stosd

; mark kernel memory as allocated (unavailable)

	   mov ecx, [tmp_page_tabs]

	   mov edx, [pg_data.pages_count-OS_BASE]

	   shr ecx, 12

	   add ecx, [pg_data.kernel_tables-OS_BASE]

	   sub edx, ecx

	   mov [pg_data.pages_free-OS_BASE], edx

	   mov edi, sys_pgmap-OS_BASE

	   mov ebx, ecx

	   shr ecx, 5

	   xor eax, eax

	   rep stosd

	   not eax

	   mov ecx, ebx

	   and ecx, 31

	   shl eax, cl

	   and [edi], eax

	   add edi, OS_BASE

	   mov [page_start-OS_BASE], edi;

	   mov ebx, sys_pgmap

	   add ebx, [pg_data.pagemap_size-OS_BASE]

	   mov [page_end-OS_BASE], ebx

	   mov [pg_data.pg_mutex-OS_BASE], 0

	   ret

align 4

init_BIOS32:

	   mov edi, 0xE0000

.pcibios_nxt:

	   cmp dword[edi], '_32_' ; "magic" word

	   je .BIOS32_found

.pcibios_nxt2:

	   add edi, 0x10

	   cmp edi, 0xFFFF0

	   je .BIOS32_not_found

	   jmp .pcibios_nxt

.BIOS32_found:			; magic word found, check control summ

	   movzx ecx, byte[edi + 9]

	   shl ecx, 4

	   mov esi, edi

	   xor eax, eax

	   cld	 ; paranoia

@@:	lodsb

	   add ah, al

	   loop @b

	   jnz .pcibios_nxt2 ; control summ must be zero

    ; BIOS32 service found !

	   mov ebp, [edi + 4]

	   mov [bios32_entry], ebp

    ; check PCI BIOS present

	   mov eax, '$PCI'

	   xor ebx, ebx

	   push cs  ; special for 'ret far' from  BIOS

	   call ebp

	   test al, al

	   jnz .PCI_BIOS32_not_found

 ; çäåñü ñîçäàþòñÿ äèñêðèïòîðû äëÿ PCI BIOS

	   add ebx, OS_BASE

	   dec ecx

	   mov [(pci_code_32-OS_BASE)], cx    ;limit 0-15

	   mov [(pci_data_32-OS_BASE)], cx    ;limit 0-15

	   mov [(pci_code_32-OS_BASE)+2], bx  ;base  0-15

	   mov [(pci_data_32-OS_BASE)+2], bx  ;base  0-15

	   shr ebx, 16

	   mov [(pci_code_32-OS_BASE)+4], bl  ;base  16-23

	   mov [(pci_data_32-OS_BASE)+4], bl  ;base  16-23

	   shr ecx, 16

	   and cl, 0x0F

	   mov ch, bh

	   add cx, D32

	   mov [(pci_code_32-OS_BASE)+6], cx  ;lim   16-19 &

	   mov [(pci_data_32-OS_BASE)+6], cx  ;base  24-31

	   mov [(pci_bios_entry-OS_BASE)], edx

	 ; jmp .end

.PCI_BIOS32_not_found:

	; çäåñü äîëæíà çàïîëíÿòñÿ pci_emu_dat

.BIOS32_not_found:

.end:

	   ret

align 4

test_cpu:	; only AMD machines supported

	   xor eax, eax

	   mov [cpu_caps-OS_BASE], eax

	   mov [cpu_caps+4-OS_BASE], eax

	   pushfd

	   pop eax

	   mov ecx, eax

	   xor eax, 0x40000

	   push eax

	   popfd

	   pushfd

	   pop eax

	   xor eax, ecx

	   jz $ 		; 386

	   push ecx

	   popfd

	   mov eax, ecx

	   xor eax, 0x200000

	   push eax

	   popfd

	   pushfd

	   pop eax

	   xor eax, ecx

	   je $ 		; 486

	   xor eax, eax

	   cpuid

	   mov [cpu_vendor-OS_BASE],   ebx

	   mov [cpu_vendor+4-OS_BASE], edx

	   mov [cpu_vendor+8-OS_BASE], ecx

	   cmp ebx, dword [AMD_str-OS_BASE]

	   jne $

	   cmp edx, dword [AMD_str+4-OS_BASE]

	   jne $

	   cmp ecx, dword [AMD_str+8-OS_BASE]

	   jne $

	   cmp eax, 1

	   jl $

	   mov eax, 1

	   cpuid

	   mov [cpu_sign-OS_BASE],  eax

	   mov [cpu_info-OS_BASE],  ebx

	   mov [cpu_caps-OS_BASE],  edx

	   mov [cpu_caps+4-OS_BASE],ecx

	   shr eax, 8

	   and eax, 0x0f

	   ret