Squash commits for public release

boot/arm32/entry.s

@@ -0,0 +1,30 @@
+.extern _start
+.extern _start_secondary_cpu
+
+.section ".xos_boot_text"
+xos_loader:
+    ldr     sp, =STACK_PHYZ_TOP
+
+    mrc     p15, #0, r0, c0, c0, #5 // Read CPU ID register.
+    and     r0, r0, #3
+    cmp     r0, #0
+    bne     secondary_cpu_loader
+
+    ldr     r0, =_start
+    mov     pc, r0
+
+secondary_cpu_loader:
+    ldr     sp, =STACK_SECONDARY_PHYZ_TOP
+    mov     r9, #512
+    mrc     p15, #0, r8, c0, c0, #5 // Read CPU ID register.
+    and     r8, r8, #3
+1:
+    sub     r8, r8, #1
+    cmp     r8, #0
+    beq     secondary_cpu_loader_exit
+    add     r9, r9, #512
+    b       1b
+secondary_cpu_loader_exit:
+    subs    sp, r9
+    ldr     r0, =_start_secondary_cpu
+    mov     pc, r0