arch/x86: reorganize core source files

Create source directory for IA32-subarch specific files, and move
qualifying files to that subdirectory.

Signed-off-by: Charles E. Youse <charles.youse@intel.com>

CODEOWNERS

@@ -43,7 +43,7 @@
 /soc/riscv32/openisa*/                    @MaureenHelm
 /arch/x86/                                @andrewboie @wentongwu
 /arch/x86/core/                           @andrewboie
-/arch/x86/core/crt0.S                     @wentongwu @nashif
+/arch/x86/core/ia32/crt0.S                @wentongwu @nashif
 /arch/x86/core/pcie.c                     @gnuless
 /arch/x86/core/multiboot.c                @gnuless
 /soc/x86/                                 @andrewboie @wentongwu

arch/x86/core/ia32.cmake

@@ -9,23 +9,23 @@ elseif(CMAKE_C_COMPILER_ID STREQUAL "GNU")
 endif()
 
 zephyr_library_sources(
-  cache.c
-  cache_s.S
-  cpuhalt.c
-  crt0.S
-  excstub.S
-  intstub.S
-  irq_manage.c
-  swap.S
-  sys_fatal_error_handler.c
-  thread.c
-  spec_ctrl.c
+  ia32/cache.c
+  ia32/cache_s.S
+  ia32/cpuhalt.c
+  ia32/crt0.S
+  ia32/excstub.S
+  ia32/intstub.S
+  ia32/irq_manage.c
+  ia32/swap.S
+  ia32/sys_fatal_error_handler.c
+  ia32/thread.c
+  ia32/spec_ctrl.c
   )
 
-zephyr_library_sources_if_kconfig(			irq_offload.c)
-zephyr_library_sources_if_kconfig(			x86_mmu.c)
-zephyr_library_sources_ifdef(CONFIG_X86_USERSPACE	userspace.S)
-zephyr_library_sources_ifdef(CONFIG_LAZY_FP_SHARING	float.c)
+zephyr_library_sources_ifdef(CONFIG_IRQ_OFFLOAD		ia32/irq_offload.c)
+zephyr_library_sources_ifdef(CONFIG_X86_MMU		ia32/x86_mmu.c)
+zephyr_library_sources_ifdef(CONFIG_X86_USERSPACE	ia32/userspace.S)
+zephyr_library_sources_ifdef(CONFIG_LAZY_FP_SHARING	ia32/float.c)
 
 # Last since we declare default exception handlers here
-zephyr_library_sources(fatal.c)
+zephyr_library_sources(ia32/fatal.c)