KolibriOS/kolibrios
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Use e820entry macro instead of hardcoded values.

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git-svn-id: svn://kolibrios.org@8217 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Ivan B
2020-11-17 21:47:10 +00:00
parent efa84a263d
commit fe0d0438ff
2 changed files with 28 additions and 32 deletions
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52
kernel/trunk/init.inc
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@@ -10,7 +10,7 @@ $Revision$
align 4
proc mem_test
; if we have BIOS with fn E820, skip the test
cmp dword [BOOT_LO.memmap_block_cnt], 0
cmp [BOOT_LO.memmap_block_cnt], 0
jnz .ret
mov eax, cr0
@@ -32,12 +32,12 @@ proc mem_test
mov cr0, eax
inc dword [BOOT_LO.memmap_block_cnt]
xor eax, eax
mov [BOOT_LO.memmap_blocks + e820entry.addr.lo], eax
mov [BOOT_LO.memmap_blocks + e820entry.addr.hi], eax
mov [BOOT_LO.memmap_blocks + e820entry.size.lo], edi
mov [BOOT_LO.memmap_blocks + e820entry.size.hi], eax
mov [BOOT_LO.memmap_blocks+e820entry.addr.lo], eax
mov [BOOT_LO.memmap_blocks+e820entry.addr.hi], eax
mov [BOOT_LO.memmap_blocks+e820entry.size.lo], edi
mov [BOOT_LO.memmap_blocks+e820entry.size.hi], eax
inc eax
mov [BOOT_LO.memmap_blocks + e820entry.type], eax
mov [BOOT_LO.memmap_blocks+e820entry.type], eax
.ret:
ret
endp
@@ -46,34 +46,34 @@ align 4
proc init_mem
; calculate maximum allocatable address and number of allocatable pages
mov edi, BOOT_LO.memmap_blocks
mov ecx, [edi-4]
mov ecx, [edi-4] ; memmap_block_cnt
xor esi, esi; esi will hold total amount of memory
xor edx, edx; edx will hold maximum allocatable address
.calcmax:
; round all to pages
mov eax, [edi]
cmp [edi+16], byte 1
mov eax, [edi+e820entry.addr.lo]
cmp byte [edi+e820entry.type], 1
jne .unusable
test eax, 0xFFF
jz @f
neg eax
and eax, 0xFFF
add [edi], eax
adc dword [edi+4], 0
sub [edi+8], eax
sbb dword [edi+12], 0
add [edi+e820entry.addr.lo], eax
adc [edi+e820entry.addr.hi], 0
sub [edi+e820entry.size.lo], eax
sbb [edi+e820entry.size.hi], 0
jc .unusable
@@:
and dword [edi+8], not 0xFFF
and [edi+e820entry.size.lo], not 0xFFF
jz .unusable
; ignore memory after 4 Gb
cmp dword [edi+4], 0
; ignore memory after 4 GiB
cmp [edi+e820entry.addr.hi], 0
jnz .unusable
mov eax, [edi]
cmp dword [edi+12], 0
cmp [edi+e820entry.size.hi], 0
jnz .overflow
add eax, [edi+8]
add eax, [edi+e820entry.size.lo]
jnc @f
.overflow:
mov eax, 0xFFFFF000
@@ -82,14 +82,14 @@ proc init_mem
jae @f
mov edx, eax
@@:
sub eax, [edi]
mov [edi+8], eax
sub eax, [edi+e820entry.addr.lo]
mov [edi+e820entry.size.lo], eax
add esi, eax
jmp .usable
.unusable:
; and dword [edi+8], 0
; and dword [edi+e820entry.size.lo], 0
.usable:
add edi, 20
add edi, sizeof.e820entry
loop .calcmax
.calculated:
mov [MEM_AMOUNT-OS_BASE], esi
@@ -195,13 +195,13 @@ proc init_page_map
mov ebx, BOOT_LO.memmap_blocks
mov edx, [ebx-4]
.scanmap:
cmp [ebx+16], byte 1
cmp byte [ebx+e820entry.type], 1
jne .next
mov ecx, [ebx+8]
mov ecx, [ebx+e820entry.size.lo]
shr ecx, 12; ecx = number of pages
jz .next
mov edi, [ebx]
mov edi, [ebx+e820entry.addr.lo]
shr edi, 12; edi = first page
mov eax, edi
shr edi, 5
@@ -239,7 +239,7 @@ proc init_page_map
inc eax
loop @b
.next:
add ebx, 20
add ebx, sizeof.e820entry
dec edx
jnz .scanmap