diff --git a/kernel/trunk/core/memory.inc b/kernel/trunk/core/memory.inc
index 01f9aedd4c..9cd24427e5 100644
--- a/kernel/trunk/core/memory.inc
+++ b/kernel/trunk/core/memory.inc
@@ -171,9 +171,14 @@ proc map_io_mem stdcall, base:dword, size:dword, flags:dword
            push ebx
            push edi
            mov eax, [size]
+           add eax, [base]
            add eax, 4095
            and eax, -4096
+           mov ecx, [base]
+           and ecx, -4096
+           sub eax, ecx
            mov [size], eax
+
            stdcall alloc_kernel_space, eax
            test eax, eax
            jz .fail
@@ -189,9 +194,7 @@ proc map_io_mem stdcall, base:dword, size:dword, flags:dword
            or edx, [flags]
 @@:
            mov [page_tabs+eax*4], edx
-          ; push eax
            invlpg [ebx]
-          ; pop eax
            inc eax
            add ebx, edi
            add edx, edi
diff --git a/kernel/trunk/init.inc b/kernel/trunk/init.inc
index bff3c0f049..992e4adff3 100644
--- a/kernel/trunk/init.inc
+++ b/kernel/trunk/init.inc
@@ -431,4 +431,120 @@ proc test_cpu
            ret
 endp
 
+uglobal
+align 4
+acpi_rsdp         rd 1
+acpi_rsdt         rd 1
+acpi_madt         rd 1
 
+acpi_rsdt_base    rd 1
+acpi_madt_base    rd 1
+acpi_lapic_base   rd 1
+acpi_ioapic_base  rd 1
+endg
+
+ACPI_HI_RSDP_WINDOW_START  equ 0x000E0000
+ACPI_HI_RSDP_WINDOW_END    equ 0x00100000
+ACPI_RSDP_CHECKSUM_LENGTH  equ 20
+ACPI_MADT_SIGN             equ 0x43495041
+
+
+acpi_locate:
+        push ebx
+        mov ebx, ACPI_HI_RSDP_WINDOW_START
+.check:
+        cmp [ebx], dword 0x20445352
+        jne .next
+        cmp [ebx+4], dword 0x20525450
+        jne .next
+
+        mov edx, ebx
+        mov ecx, ACPI_RSDP_CHECKSUM_LENGTH
+        xor eax, eax
+.sum:
+        add al, [edx]
+        inc edx
+        loop .sum
+
+        test al, al
+        jnz .next
+
+        mov eax, ebx
+        pop ebx
+        ret
+.next:
+        add ebx, 16
+        cmp ebx, ACPI_HI_RSDP_WINDOW_END
+        jb .check
+
+        pop ebx
+        xor eax, eax
+        ret
+
+align 4
+rsdt_find:           ;ecx= rsdt edx= SIG
+        push ebx
+        push esi
+
+        lea ebx, [ecx+36]
+        mov esi, [ecx+4]
+        add esi, ecx
+.next:
+        mov eax, [ebx]
+        cmp [eax], edx
+        je .done
+
+        add ebx, 4
+        cmp ebx, esi
+        jb .next
+
+        xor eax, eax
+        pop esi
+        pop ebx
+        ret
+
+.done:
+        mov eax, [ebx]
+        pop esi
+        pop ebx
+        ret
+
+
+align 4
+
+check_acpi:
+
+        call acpi_locate
+        test eax, eax
+        jz .done
+
+        mov ecx, [eax+16]
+        mov edx, ACPI_MADT_SIGN
+        mov [acpi_rsdt_base-OS_BASE], ecx
+        call rsdt_find
+        test eax, eax
+        jz .done
+
+        mov [acpi_madt_base-OS_BASE], eax
+        mov ecx, [eax+36]
+        mov [acpi_lapic_base-OS_BASE], ecx
+
+        lea edx, [eax+44]
+        mov ecx, [eax+4]
+        add ecx, eax
+.check:
+        mov eax, [edx]
+        cmp al, 1
+        je .ioapic
+
+.next:
+        movzx eax, ah
+        add edx, eax
+        cmp edx, ecx
+        jb .check
+.done:
+        ret
+.ioapic:
+        mov eax, [edx+4]
+        mov [acpi_ioapic_base-OS_BASE], eax
+        ret
diff --git a/kernel/trunk/kernel.asm b/kernel/trunk/kernel.asm
index 5eb6dc103a..fe29ea838e 100644
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@@ -258,6 +258,7 @@ B32:
            call test_cpu
            bts [cpu_caps-OS_BASE], CAPS_TSC     ;force use rdtsc
 
+           call check_acpi
            call init_BIOS32
 ; MEMORY MODEL
            call mem_test