MEM_WB equ 6 ;write-back memory
MEM_WC equ 1 ;write combined memory
MEM_UC equ 0 ;uncached memory
align 4
proc mem_test
mov eax, cr0
and eax, not (CR0_CD+CR0_NW)
or eax, CR0_CD ;disable caching
mov cr0, eax
wbinvd ;invalidate cache
xor edi, edi
mov ebx, 'TEST'
@@:
add edi, 0x400000
xchg ebx, dword [edi]
cmp dword [edi], 'TEST'
xchg ebx, dword [edi]
je @b
mov [MEM_AMOUNT-OS_BASE], edi
and eax, not (CR0_CD+CR0_NW) ;enable caching
mov cr0, eax
mov eax, edi
ret
endp
align 4
proc init_mem
mov eax, [MEM_AMOUNT-OS_BASE]
mov [pg_data.mem_amount-OS_BASE], eax
mov [pg_data.kernel_max-OS_BASE], eax
shr eax, 12
mov edx, eax
mov [pg_data.pages_count-OS_BASE], eax
mov [pg_data.kernel_pages-OS_BASE], eax
shr eax, 3
mov [pg_data.pagemap_size-OS_BASE], eax
shr edx, 10
cmp edx, 3
ja @f
inc edx ;at least 4Mb for kernel heap
@@:
mov [pg_data.kernel_tables-OS_BASE], edx
xor eax, eax
mov edi, sys_pgdir-OS_BASE
mov ecx, 4096/4
cld
rep stosd
mov edx, (sys_pgdir-OS_BASE)+ 0x800; (OS_BASE shr 20)
bt [cpu_caps-OS_BASE], CAPS_PSE
jnc .no_PSE
mov ebx, cr4
or ebx, CR4_PSE
mov eax, PG_LARGE+PG_SW
bt [cpu_caps-OS_BASE], CAPS_PGE
jnc @F
or eax, PG_GLOBAL
or ebx, CR4_PGE
@@:
mov cr4, ebx
sub [pg_data.kernel_tables-OS_BASE], 2
mov [edx], eax
add eax, 0x00400000
mov [edx+4], eax
add edx, 8
mov eax, 0x800000+PG_SW
mov ecx, (tmp_page_tab-0x800000)/4096
jmp .map_low
.no_PSE:
mov eax, PG_SW
mov ecx, tmp_page_tab/4096
.map_low:
mov edi, tmp_page_tab
@@: ;
stosd
add eax, 0x1000
dec ecx
jnz @B
mov ecx, [pg_data.kernel_tables-OS_BASE]
shl ecx, 10
xor eax, eax
rep stosd
mov ecx, [pg_data.kernel_tables-OS_BASE]
mov eax, tmp_page_tab+PG_SW
mov edi, edx
.map_kernel_tabs:
stosd
add eax, 0x1000
dec ecx
jnz .map_kernel_tabs
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
movsd
ret
endp
align 4
proc init_page_map
mov edi, sys_pgmap-OS_BASE
mov ecx, ((HEAP_BASE-OS_BASE)/4096)/32 ;384/4
mov ebx, ecx
xor eax,eax
cld
rep stosd
not eax
mov ecx, [pg_data.pagemap_size-OS_BASE]
sub ecx, ebx
shr ecx, 2
rep stosd
lea edi, [sys_pgmap-OS_BASE+ebx*4] ;+384
mov edx, [pg_data.pages_count-OS_BASE]
mov ecx, [pg_data.kernel_tables-OS_BASE]
add ecx, ((HEAP_BASE-OS_BASE)/4096) and 31
sub edx, (HEAP_BASE-OS_BASE)/4096
sub edx, ecx
mov [pg_data.pages_free-OS_BASE], edx
xor eax, eax
mov ebx, ecx
shr ecx, 5
rep stosd
not eax
mov ecx, ebx
and ecx, 31
shl eax, cl
mov [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
proc test_cpu
locals
cpu_type dd ?
cpu_id dd ?
cpu_Intel dd ?
cpu_AMD dd ?
endl
mov [cpu_type], 0
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
mov [cpu_type], CPU_386
jz .end_cpuid
push ecx
popfd
mov [cpu_type], CPU_486
mov eax, ecx
xor eax, 0x200000
push eax
popfd
pushfd
pop eax
xor eax, ecx
je .end_cpuid
mov [cpu_id], 1
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 [intel_str-OS_BASE]
jne .check_AMD
cmp edx, dword [intel_str+4-OS_BASE]
jne .check_AMD
cmp ecx, dword [intel_str+8-OS_BASE]
jne .check_AMD
mov [cpu_Intel], 1
cmp eax, 1
jl .end_cpuid
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
.end_cpuid:
mov eax, [cpu_type]
ret
.check_AMD:
cmp ebx, dword [AMD_str-OS_BASE]
jne .unknown
cmp edx, dword [AMD_str+4-OS_BASE]
jne .unknown
cmp ecx, dword [AMD_str+8-OS_BASE]
jne .unknown
mov [cpu_AMD], 1
cmp eax, 1
jl .unknown
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
.unknown:
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
endp