Kernel: Replace i386 with i686

I don't really want to be working with i386 since it doesn't support
compare exchange instruction

kernel/include/kernel/Arch.h

@@ -1,11 +1,11 @@
 #pragma once
 
 #define x86_64 1
-#define i386   2
+#define i686   2
 
 #define ARCH(arch) (__arch == arch)
 
-#if !defined(__arch) || (__arch != x86_64 && __arch != i386)
+#if !defined(__arch) || (__arch != x86_64 && __arch != i686)
 	#error "Unsupported architecture"
 #endif
 
@@ -13,10 +13,12 @@
 	#define read_rsp(rsp) asm volatile("movq %%rsp, %0" : "=r"(rsp))
 	#define push_callee_saved() asm volatile("pushq %rbx; pushq %rbp; pushq %r12; pushq %r13; pushq %r14; pushq %r15")
 	#define pop_callee_saved()  asm volatile("popq %r15; popq %r14; popq %r13; popq %r12; popq %rbp; popq %rbx")
-#else
+#elif ARCH(i686)
 	#define read_rsp(rsp) asm volatile("movl %%esp, %0" : "=r"(rsp))
 	#define push_callee_saved() asm volatile("pushal")
 	#define pop_callee_saved() asm volatile("popal")
+#else
+	#error
 #endif
 
 #include <stdint.h>

kernel/include/kernel/FS/TmpFS/Definitions.h

@@ -28,7 +28,7 @@ namespace Kernel
 		// 1x triply indirect
 		BAN::Array<paddr_t, 5> block;
 		static constexpr size_t direct_block_count = 2;
-#elif ARCH(i386)
+#elif ARCH(i686)
 		// 14x direct blocks
 		// 1x singly indirect
 		// 1x doubly indirect

kernel/include/kernel/Memory/Types.h

@@ -4,7 +4,7 @@
 
 #if ARCH(x86_64)
 	#define KERNEL_OFFSET 0xFFFFFFFF80000000
-#elif ARCH(i386)
+#elif ARCH(i686)
 	#define KERNEL_OFFSET 0xC0000000
 #else
 	#error

kernel/include/kernel/Processor.h

@@ -19,7 +19,7 @@ namespace Kernel
 	using ProcessorID = uint32_t;
 	constexpr ProcessorID PROCESSOR_NONE = 0xFFFFFFFF;
 
-#if ARCH(x86_64) || ARCH(i386)
+#if ARCH(x86_64) || ARCH(i686)
 	class Processor
 	{
 		BAN_NON_COPYABLE(Processor);