forked from KolibriOS/kolibrios
use fn E820 of int 15h to query memory map (if available)
git-svn-id: svn://kolibrios.org@1103 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Evgeny Grechnikov (Diamond)
parent
f705611d81
commit
7931378fda
@ -815,9 +815,12 @@ end if
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dec al
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mov [boot_dev], al
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; GET MEMORY MAP
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include 'detect/biosmem.inc'
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; READ DISKETTE TO MEMORY
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; cmp [boot_dev],0
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cmp [boot_dev],0
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jne no_sys_on_floppy
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mov si,diskload
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call print
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@ -453,7 +453,7 @@ proc new_mem_resize stdcall, new_size:dword
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@@:
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call alloc_page
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test eax, eax
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jz .exit
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jz .exit_pop
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stdcall map_page_table, edi, eax
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@ -491,6 +491,9 @@ proc new_mem_resize stdcall, new_size:dword
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jb @B
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jmp .update_size
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.exit_pop:
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pop edi
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pop esi
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.exit:
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xor eax, eax
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inc eax
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@ -14,6 +14,9 @@ MEM_UC equ 0 ;uncached memory
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align 4
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proc mem_test
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; if we have BIOS with fn E820, skip the test
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cmp dword [BOOT_VAR-OS_BASE + 0x9100], 0
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jnz .ret
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mov eax, cr0
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and eax, not (CR0_CD+CR0_NW)
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@ -29,27 +32,80 @@ proc mem_test
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cmp dword [edi], 'TEST'
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xchg ebx, dword [edi]
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je @b
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mov [MEM_AMOUNT-OS_BASE], edi
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and eax, not (CR0_CD+CR0_NW) ;enable caching
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mov cr0, eax
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mov eax, edi
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inc dword [BOOT_VAR-OS_BASE + 0x9100]
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xor eax, eax
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mov [BOOT_VAR-OS_BASE + 0x9104], eax
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mov [BOOT_VAR-OS_BASE + 0x9108], eax
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mov [BOOT_VAR-OS_BASE + 0x910C], edi
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mov [BOOT_VAR-OS_BASE + 0x9110], eax
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.ret:
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ret
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endp
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align 4
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proc init_mem
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mov eax, [MEM_AMOUNT-OS_BASE]
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mov [pg_data.mem_amount-OS_BASE], eax
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; calculate maximum allocatable address and number of allocatable pages
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mov edi, BOOT_VAR-OS_BASE + 0x9104
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mov ecx, [edi-4]
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xor esi, esi ; esi will hold total amount of memory
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xor edx, edx ; edx will hold maximum allocatable address
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.calcmax:
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; round all to pages
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mov eax, [edi]
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test eax, 0xFFF
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jz @f
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neg eax
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and eax, 0xFFF
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add [edi], eax
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adc dword [edi+4], 0
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sub [edi+8], eax
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sbb dword [edi+12], 0
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jc .unusable
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@@:
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and dword [edi+8], not 0xFFF
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jz .unusable
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; ignore memory after 4 Gb
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cmp dword [edi+4], 0
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jnz .unusable
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mov eax, [edi]
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cmp dword [edi+12], 0
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jnz .overflow
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add eax, [edi+8]
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jnc @f
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.overflow:
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mov eax, 0xFFFFF000
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@@:
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cmp edx, eax
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jae @f
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mov edx, eax
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@@:
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sub eax, [edi]
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mov [edi+8], eax
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add esi, eax
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jmp .usable
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.unusable:
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and dword [edi+8], 0
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.usable:
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add edi, 20
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loop .calcmax
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.calculated:
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mov [MEM_AMOUNT-OS_BASE], esi
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mov [pg_data.mem_amount-OS_BASE], esi
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shr esi, 12
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mov [pg_data.pages_count-OS_BASE], esi
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shr eax, 12
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mov [pg_data.pages_count-OS_BASE], eax
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shr eax, 3
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mov [pg_data.pagemap_size-OS_BASE], eax
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shr edx, 12
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add edx, 31
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and edx, not 31
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shr edx, 3
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mov [pg_data.pagemap_size-OS_BASE], edx
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add eax, (sys_pgmap-OS_BASE)+4095
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and eax, not 4095
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mov [tmp_page_tabs], eax
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add edx, (sys_pgmap-OS_BASE)+4095
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and edx, not 4095
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mov [tmp_page_tabs], edx
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mov edx, (((sys_pgmap-OS_BASE) + 0xFFFFFF) and not 0xFFFFFF) shr 12
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mov [pg_data.kernel_pages-OS_BASE], edx
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@ -121,14 +177,63 @@ endp
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align 4
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proc init_page_map
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; mark all memory as unavailable
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mov edi, sys_pgmap-OS_BASE
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mov ecx, [pg_data.pagemap_size-OS_BASE]
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shr ecx, 2
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or eax, -1
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xor eax, eax
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cld
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rep stosd
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; scan through memory map and mark free areas as available
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mov ebx, BOOT_VAR-OS_BASE + 0x9104
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mov edx, [ebx-4]
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.scanmap:
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mov ecx, [ebx+8]
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shr ecx, 12 ; ecx = number of pages
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jz .next
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mov edi, [ebx]
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shr edi, 12 ; edi = first page
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mov eax, edi
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neg eax
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shr edi, 5
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add edi, sys_pgmap-OS_BASE
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and eax, 31
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jz .startok
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sub ecx, eax
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jbe .onedword
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push ecx
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mov ecx, eax
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xor eax, eax
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inc eax
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shl eax, cl
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dec eax
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or [edi], eax
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add edi, 4
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pop ecx
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.startok:
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push ecx
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shr ecx, 5
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or eax, -1
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rep stosd
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pop ecx
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and ecx, 31
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not eax
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shl eax, cl
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or [edi], eax
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jmp .next
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.onedword:
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add ecx, eax
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@@:
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dec eax
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bts [edi], eax
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loop @b
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.next:
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add ebx, 20
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dec edx
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jnz .scanmap
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; mark kernel memory as allocated (unavailable)
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mov ecx, [tmp_page_tabs]
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mov edx, [pg_data.pages_count-OS_BASE]
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shr ecx, 12
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@ -146,7 +251,7 @@ proc init_page_map
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mov ecx, ebx
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and ecx, 31
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shl eax, cl
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mov [edi], eax
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and [edi], eax
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add edi, OS_BASE
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mov [page_start-OS_BASE], edi;
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@ -23,6 +23,8 @@
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; 0x9046 - word - flags
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; 0:907F byte number of BIOS hard disks
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; 0:9080 Nbytes BIOS hard disks
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; 0:9100 word available physical memory map: number of blocks
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; 0:9104 available physical memory map: blocks
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;
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; Runtime:
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;
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