Kernel/armv7 - Hack to prevent two multiple running _start

- Fixes qemu causing corruption

diff --git a/KernelLand/Kernel/arch/armv7/start.S b/KernelLand/Kernel/arch/armv7/start.S
index 8193b31..1fe0fd8 100644 (file)
--- a/KernelLand/Kernel/arch/armv7/start.S
+++ b/KernelLand/Kernel/arch/armv7/start.S
@@ -16,8 +16,17 @@ ivt_unused:  b .             @ 0x14 Not Used
 ivt_irq:       b IRQHandler    @ 0x18 IRQ
 ivt_fiq:       b .             @ 0x1C FIQ (Fast interrupt)
 
+init_lock:     .long 0
+
+.extern SHORTLOCK
 .globl _start
 _start:
+       ldr r1, =init_lock
+       mov r0, #1
+       swp r0, r0, [r1]
+       tst r0,r0
+       bne .smp_halt
+       
        ldr r2, =UART0_PADDR
        mov r1, #'A'
        str r1, [r2]    
@@ -116,6 +125,8 @@ _start:
        ldr r0, =kmain
        mov pc, r0
 1:     b 1b    @ Infinite loop
+.smp_halt:
+1:     b 1b
 
 .comm irqstack, 0x1000 @ ; 4KiB Stack
 .comm abortstack, 0x1000       @ ; 4KiB Stack