diff --git a/kernel/trunk/acpi/acpi.inc b/kernel/trunk/acpi/acpi.inc
index da86817925..a91fa09b80 100644
--- a/kernel/trunk/acpi/acpi.inc
+++ b/kernel/trunk/acpi/acpi.inc
@@ -229,6 +229,11 @@ check_acpi:
 
         mov     ecx, [eax+ACPI_MADT.Local_IC_Addr]
         mov     [acpi_lapic_base], ecx
+        push    eax
+        stdcall map_io_mem, ecx, 0x1000, PG_GLOBAL+PG_NOCACHE+PG_SWR
+        mov     [LAPIC_BASE], eax
+        mov     ecx, eax
+        pop     eax
 
         mov     edi, smpt
         mov     ebx, [ecx+APIC_ID]
diff --git a/kernel/trunk/kernel.asm b/kernel/trunk/kernel.asm
index 8d9e96f610..140a16ff50 100644
--- a/kernel/trunk/kernel.asm
+++ b/kernel/trunk/kernel.asm
@@ -646,9 +646,13 @@ endg
         mov     edi, OS_BASE + 8000h
         mov     ecx, (ap_init16_size + 3) / 4
         rep movsd
+        mov     eax, [LAPIC_BASE]
+        test    eax, eax
+        jnz     @f
         stdcall map_io_mem, [acpi_lapic_base], 0x1000, PG_GLOBAL+PG_NOCACHE+PG_SWR
         mov     [LAPIC_BASE], eax
-        lea     edi, [eax+300h]
+@@:
+        lea     edi, [eax+APIC_ICRL]
         mov     esi, smpt+4
         dec     ebx
 .wake_cpus_loop: