1168,41 → 1168,52 |
|
mov ecx, 0x2FF |
rdmsr ; |
; has BIOS already initialized MTRRs? |
test ah, 8 |
jnz .skip_init |
; rarely needed, so mainly placeholder |
; main memory - cached |
push eax |
|
xor edx, edx |
xor eax, eax |
mov ecx, 0x2FF |
wrmsr ;disable all MTRR |
|
mov eax, [MEM_AMOUNT] |
; round eax up to next power of 2 |
dec eax |
bsr ecx, eax |
mov eax, 2 |
shl eax, cl |
stdcall set_mtrr, edx,edx,eax,MEM_WB |
stdcall set_mtrr, 1,[LFBAddress],[LFBSize],MEM_WC |
mov ebx, 2 |
shl ebx, cl |
dec ebx |
; base of memory range = 0, type of memory range = MEM_WB |
xor edx, edx |
mov eax, MEM_WB |
mov ecx, 0x200 |
wrmsr |
; mask of memory range = 0xFFFFFFFFF - (size - 1), ebx = size - 1 |
mov eax, 0xFFFFFFFF |
mov edx, 0x0000000F |
sub eax, ebx |
sbb edx, 0 |
or eax, 0x800 |
inc ecx |
wrmsr |
; clear unused MTRRs |
xor eax, eax |
mov ecx, 0x204 |
mov ebx, 6 |
xor edx, edx |
@@: |
wrmsr ;disable unused MTRR |
wrmsr |
inc ecx |
cmp ecx, 0x210 |
jb @b |
; enable MTRRs |
pop eax |
or ah, 8 |
and al, 0xF0 ; default memtype = UC |
mov ecx, 0x2FF |
wrmsr |
inc ecx |
dec ebx |
jnz @b |
.skip_init: |
stdcall set_mtrr, [LFBAddress],[LFBSize],MEM_WC |
|
wbinvd ;again invalidate |
|
pop eax |
or eax, 0x800 ;set default memtype to UC |
and al, 0xF0 |
mov ecx, 0x2FF |
wrmsr ;and enable MTRR |
|
mov eax, cr0 |
and eax, not 0x60000000 |
mov cr0, eax ; enable caching |
1211,13 → 1222,29 |
endp |
|
align 4 |
proc set_mtrr stdcall, reg:dword,base:dword,size:dword,mem_type:dword |
|
proc set_mtrr stdcall, base:dword,size:dword,mem_type:dword |
; find unused register |
mov ecx, 0x201 |
@@: |
rdmsr |
dec ecx |
test ah, 8 |
jz .found |
rdmsr |
mov al, 0 ; clear memory type field |
cmp eax, [base] |
jz .ret |
add ecx, 3 |
cmp ecx, 0x210 |
jb @b |
; no free registers, ignore the call |
.ret: |
ret |
.found: |
; found, write values |
xor edx, edx |
mov eax, [base] |
or eax, [mem_type] |
mov ecx, [reg] |
lea ecx, [0x200+ecx*2] |
wrmsr |
|
mov ebx, [size] |