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kolibrios/kernel/branches/Kolibri-A/trunk/init.inc
Artem Jerdev (art_zh) 2a927db105 direct detection of available memory 
git-svn-id: svn://kolibrios.org@2047 a494cfbc-eb01-0410-851d-a64ba20cac60
2011-08-14 09:08:02 +00:00

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2008. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
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 <sys_pgdir> table
mov edi, sys_pgdir-OS_BASE
mov ecx, 4096/4
rep stosd
ret
; ======================================================================
align 4
proc 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
mov edx, esi ; edx will hold maximum allocatable address
shr esi, 12
mov [pg_data.pages_count-OS_BASE], esi ; max number of PTEs ?
shr edx, 12
add edx, 31
and edx, not 31
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
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
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
ret
endp
align 4
proc init_page_map
; mark all memory as unavailable
mov edi, sys_pgmap-OS_BASE
mov ecx, [pg_data.pagemap_size-OS_BASE]
shr ecx, 2
xor eax, eax
cld
rep stosd
; scan through memory map and mark free areas as available
mov ebx, BOOT_VAR-OS_BASE + 0x9104
mov edx, [ebx-4]
.scanmap:
mov ecx, [ebx+8]
shr ecx, 12 ; ecx = number of pages
jz .next
mov edi, [ebx]
shr edi, 12 ; edi = first page
mov eax, edi
shr edi, 5
shl edi, 2
add edi, sys_pgmap-OS_BASE
and eax, 31
jz .startok
add ecx, eax
sub ecx, 32
jbe .onedword
push ecx
mov ecx, eax
or eax, -1
shl eax, cl
or [edi], eax
add edi, 4
pop ecx
.startok:
push ecx
shr ecx, 5
or eax, -1
rep stosd
pop ecx
and ecx, 31
neg eax
shl eax, cl
dec eax
or [edi], eax
jmp .next
.onedword:
add ecx, 32
sub ecx, eax
@@:
bts [edi], eax
inc eax
loop @b
.next:
add ebx, 20
dec edx
jnz .scanmap
; 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
endp
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
; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> 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:
; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 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
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