diff --git a/hypervisor/arch/x86/cpu_secondary.S b/hypervisor/arch/x86/cpu_secondary.S
index 74a9562b1..55a2a1627 100644
--- a/hypervisor/arch/x86/cpu_secondary.S
+++ b/hypervisor/arch/x86/cpu_secondary.S
@@ -46,6 +46,7 @@
    .align   4
    .code16
    .global      cpu_secondary_reset
+   .org 0
 cpu_secondary_reset:
 
     /* Disable local interrupts */
@@ -61,8 +62,9 @@ cpu_secondary_reset:
 
     /* Set CR3 to PML4 table address */
 
-    movl    $CPU_Boot_Page_Tables_Start, %edi
-    mov     %edi, %cr3
+    movl    $CPU_Boot_Page_Tables_ptr, %ebx
+    mov     (%ebx), %eax
+    mov     %eax, %cr3
 
     /* Set LME bit in EFER */
 
@@ -83,7 +85,14 @@ cpu_secondary_reset:
 
     /* Perform a long jump based to start executing in 64-bit mode */
 
-    data32 ljmp $HOST_GDT_RING0_CODE_SEL, $cpu_secondary_long_mode
+    movl    $ap_long_mode_jump_ref, %ebx
+    ljmpl   *(%ebx)
+
+    .align 8
+    .global ap_long_mode_jump_ref
+ap_long_mode_jump_ref:
+    .long   cpu_secondary_long_mode
+    .word   HOST_GDT_RING0_CODE_SEL
 
     .code64
 cpu_secondary_long_mode:
@@ -100,7 +109,8 @@ cpu_secondary_long_mode:
     /* Obtain secondary CPU spin-lock to serialize
        booting of secondary cores for a bit */
 
-    spinlock_obtain(cpu_secondary_spinlock)
+    mov     $cpu_secondary_spinlock, %rdi
+    spinlock_obtain(%rdi)
 
     /* Initialize temporary stack pointer
        NOTE:  Using the PML4 memory (PDPT address is top of memory
@@ -110,21 +120,15 @@ cpu_secondary_long_mode:
               the top of this page.  This stack is only
               used for a VERY short period of time, so
               this reuse of PML4 memory should be acceptable. */
-
-    movq    $cpu_secondary_pdpt_addr, %rsp
+    lea     cpu_secondary_pdpt_addr(%rip), %rsp
 
     /* Push sp magic to top of stack for call trace */
     pushq   $SP_BOTTOM_MAGIC
 
     /* Jump to C entry for the AP */
 
-    call    cpu_secondary_init
-
-cpu_secondary_error:
-
-    /* Error condition trap */
-
-    jmp     cpu_secondary_error
+    mov     $cpu_secondary_init, %rax
+    jmp     *%rax
 
 /* GDT table */
     .align  4
@@ -136,17 +140,23 @@ cpu_secondary_gdt_end:
 
 /* GDT pointer */
     .align  2
+    .global cpu_secondary_gdt_ptr
 cpu_secondary_gdt_ptr:
     .short  (cpu_secondary_gdt_end - cpu_secondary_gdt) - 1
     .quad   cpu_secondary_gdt
 
 /* PML4, PDPT, and PD tables initialized to map first 4 GBytes of memory */
+    .align  4
+    .global CPU_Boot_Page_Tables_ptr
+CPU_Boot_Page_Tables_ptr:
+    .long CPU_Boot_Page_Tables_Start
 
     .align  CPU_PAGE_SIZE
     .global CPU_Boot_Page_Tables_Start
 CPU_Boot_Page_Tables_Start:
     .quad   cpu_secondary_pdpt_addr + (IA32E_COMM_P_BIT | IA32E_COMM_RW_BIT)
     .align  CPU_PAGE_SIZE
+    .global cpu_secondary_pdpt_addr
 cpu_secondary_pdpt_addr:
     address = 0
     .rept   4
diff --git a/hypervisor/bsp/ld/link_ram.ld.in b/hypervisor/bsp/ld/link_ram.ld.in
index 551f1eeec..b1136c0cc 100644
--- a/hypervisor/bsp/ld/link_ram.ld.in
+++ b/hypervisor/bsp/ld/link_ram.ld.in
@@ -5,7 +5,7 @@ ENTRY(cpu_primary_start_32)
 MEMORY
 {
     /* Low 1MB of memory for secondary processor start-up */
-    lowram  :   ORIGIN = CONFIG_LOW_RAM_START, LENGTH = CONFIG_LOW_RAM_SIZE
+    lowram  :   ORIGIN = 0, LENGTH = CONFIG_LOW_RAM_SIZE
 
     /* 32 MBytes of RAM for HV */
     ram     :   ORIGIN = CONFIG_RAM_START, LENGTH = CONFIG_RAM_SIZE
@@ -43,6 +43,7 @@ SECTIONS
 
     .cpu_secondary : AT (_ld_cpu_secondary_reset_load)
     {
+		/* entry point of AP wakeup, must be at the beginning of this section*/
         _ld_cpu_secondary_reset_start = .;
         *(.cpu_secondary_reset);
         . = ALIGN(4);
diff --git a/hypervisor/bsp/sbl/include/bsp/bsp_cfg.h b/hypervisor/bsp/sbl/include/bsp/bsp_cfg.h
index 47f8cd2d7..b39dd7d2f 100644
--- a/hypervisor/bsp/sbl/include/bsp/bsp_cfg.h
+++ b/hypervisor/bsp/sbl/include/bsp/bsp_cfg.h
@@ -41,7 +41,6 @@
 #define HEAP_SIZE	0x100000
 #define CONSOLE_LOGLEVEL_DEFAULT	2
 #define MEM_LOGLEVEL_DEFAULT		4
-#define	CONFIG_LOW_RAM_START	0x00001000
 #define	CONFIG_LOW_RAM_SIZE	0x000CF000
 #define	CONFIG_RAM_START	0x6E000000
 #define	CONFIG_RAM_SIZE		0x02000000	/* 32M */
diff --git a/hypervisor/bsp/uefi/include/bsp/bsp_cfg.h b/hypervisor/bsp/uefi/include/bsp/bsp_cfg.h
index 53b145c7d..0f483867d 100644
--- a/hypervisor/bsp/uefi/include/bsp/bsp_cfg.h
+++ b/hypervisor/bsp/uefi/include/bsp/bsp_cfg.h
@@ -41,7 +41,6 @@
 #define HEAP_SIZE	0x100000
 #define CONSOLE_LOGLEVEL_DEFAULT	2
 #define MEM_LOGLEVEL_DEFAULT		4
-#define	CONFIG_LOW_RAM_START	0x00008000
 #define	CONFIG_LOW_RAM_SIZE	0x00010000
 #define	CONFIG_RAM_START	0x20000000
 #define	CONFIG_RAM_SIZE		0x02000000	/* 32M */