efi/arm: Begin stubbing out the essentials, add fdt library

* We *might* no longer need FDT knowledge in the bootloader?
* For now though, arm sources reference gFDT, so we need it.
* Need to move away from lazy gFDT and store in arch_kernel_args.
  (which is next and will be a larger commit)

Change-Id: I77cce0fc645143b78a7fd9f50ac8b96c97b5c862
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2268
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

src/system/boot/platform/efi/Jamfile

@@ -8,7 +8,7 @@ UsePrivateHeaders [ FDirName kernel arch $(TARGET_KERNEL_ARCH) ] ;
 SubDirHdrs $(HAIKU_TOP) src add-ons kernel partitioning_systems gpt ;
 
 {
-	local defines = _BOOT_MODE GNU_EFI_USE_MS_ABI _BOOT_PLATFORM_EFI ;
+	local defines = _BOOT_MODE _BOOT_PLATFORM_EFI ;
 	defines = [ FDefines $(defines) ] ;
 	SubDirCcFlags $(defines) ;
 	SubDirC++Flags $(defines) -fno-rtti ;
@@ -31,14 +31,21 @@ local platform_src =
 	serial.cpp
 	;
 
+local support_libs ;
+
+if $(TARGET_KERNEL_ARCH) in arm arm64 {
+	support_libs += boot_fdt.a ;
+}
+
 local platform ;
 for platform in [ MultiBootSubDirSetup efi ] {
 	on $(platform) {
 
 		BootMergeObject boot_platform_efi_common.o :
 			$(platform_src)
-			:
-			: boot_platform_generic_efi.a
+			: :
+			$(support_libs)
+			boot_platform_generic_efi.a
 		;
 
 		BootMergeObject boot_platform_efi.o :

src/system/boot/platform/efi/arch/arm/Jamfile

@@ -6,10 +6,11 @@ UsePrivateHeaders [ FDirName kernel platform ] ;
 UsePrivateHeaders [ FDirName kernel boot platform efi ] ;
 
 local arch_src =
+	crt0-efi-$(TARGET_ARCH).S
 	#entry.S
 	relocation_func.cpp
-	#arch_smp.cpp
-	#arch_mmu.cpp
+	arch_smp.cpp
+	arch_mmu.cpp
 	arch_timer.cpp
 	;
 

src/system/boot/platform/efi/arch/arm/arch_mmu.cpp

@@ -0,0 +1,10 @@
+/*
+ * Copyright 2019-2020 Haiku, Inc. All rights reserved.
+ * Released under the terms of the MIT License.
+ */
+
+void
+arch_mmu_init()
+{
+	// Stub
+}

src/system/boot/platform/efi/arch/arm/arch_smp.cpp

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2019-2020, Haiku, Inc. All rights reserved.
+ * Released under the terms of the MIT License.
+*/
+
+
+#include "arch_smp.h"
+
+#include <string.h>
+
+#include <KernelExport.h>
+
+#include <kernel.h>
+#include <safemode.h>
+#include <boot/platform.h>
+#include <boot/stage2.h>
+#include <boot/menu.h>
+
+
+//#define TRACE_SMP
+#ifdef TRACE_SMP
+#	define TRACE(x) dprintf x
+#else
+#	define TRACE(x) ;
+#endif
+
+
+int
+arch_smp_get_current_cpu(void)
+{
+	// One cpu for now.
+	return 0;
+}
+
+
+void
+arch_smp_init_other_cpus(void)
+{
+	// One cpu for now.
+	gKernelArgs.num_cpus = 1;
+	return;
+}
+
+
+void
+arch_smp_boot_other_cpus(uint32 pml4, uint64 kernel_entry)
+{
+	// One cpu for now.
+}
+
+
+void
+arch_smp_add_safemode_menus(Menu *menu)
+{
+	MenuItem *item;
+
+	if (gKernelArgs.num_cpus < 2)
+		return;
+
+	item = new(nothrow) MenuItem("Disable SMP");
+	menu->AddItem(item);
+	item->SetData(B_SAFEMODE_DISABLE_SMP);
+	item->SetType(MENU_ITEM_MARKABLE);
+	item->SetHelpText("Disables all but one CPU core.");
+}
+
+
+void
+arch_smp_init(void)
+{
+	// One cpu for now.
+}

src/system/boot/platform/efi/arch/arm/arch_start.cpp

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2019-2020 Haiku, Inc. All rights reserved.
+ * Released under the terms of the MIT License.
+ */
+
+
+#include <boot/platform.h>
+#include <boot/stage2.h>
+#include <boot/stdio.h>
+
+
+void
+arch_start_kernel(addr_t kernelEntry)
+{
+	// Kernel Entry!
+}