Cleaned up ELF64 address handling.

* platform_allocate_elf_region() is removed, it is implemented in platform-
  independent code now (ELF*Class::AllocateRegion). For ELF64 it is now
  assumed that 64-bit addresses are mapped in the loader's 32-bit address space
  as (address - KERNEL_BASE_64BIT + KERNEL_BASE).
* mapped_delta field from preloaded_*_image removed, now handled compile-time
  using the ELF*Class::Map method.
* Also link the kernel with -z max-page-size=0x1000, removes the need for
  2MB alignment on the data segment (not going to map the kernel with large
  pages for the time being).

headers/private/kernel/boot/elf.h

@@ -47,7 +47,6 @@ struct preloaded_elf32_image : public preloaded_image {
 	Elf32_Ehdr	elf_header;
 	elf32_region text_region;
 	elf32_region data_region;
-	uint32		mapped_delta;
 
 	FixedWidthPointer<Elf32_Sym> syms;
 	FixedWidthPointer<Elf32_Rel> rel;
@@ -65,7 +64,6 @@ struct preloaded_elf64_image : public preloaded_image {
 	Elf64_Ehdr	elf_header;
 	elf64_region text_region;
 	elf64_region data_region;
-	uint64		mapped_delta;
 
 	FixedWidthPointer<Elf64_Sym> syms;
 	FixedWidthPointer<Elf64_Rel> rel;
@@ -84,18 +82,8 @@ extern status_t boot_elf_resolve_symbol(preloaded_elf32_image* image,
 	struct Elf32_Sym* symbol, Elf32_Addr* symbolAddress);
 extern status_t boot_elf_resolve_symbol(preloaded_elf64_image* image,
 	struct Elf64_Sym* symbol, Elf64_Addr* symbolAddress);
-
-
-// Helper method to set a relocation at the mapped address in the loader's
-// address space.
-template<typename ImageType, typename AddrType>
-inline void
-boot_elf_set_relocation(ImageType* image, AddrType resolveAddress,
-	AddrType finalAddress)
-{
-	AddrType* dest = (AddrType*)(addr_t)(resolveAddress + image->mapped_delta);
-	*dest = finalAddress;
-}
+extern void boot_elf64_set_relocation(Elf64_Addr resolveAddress,
+	Elf64_Addr finalAddress);
 #endif
 
 #endif	/* KERNEL_BOOT_ELF_H */

headers/private/kernel/boot/platform.h

@@ -72,13 +72,6 @@ extern size_t platform_get_user_input_text(Menu *menu, MenuItem *item,
 	char *buffer, size_t bufferSize);
 extern char* platform_debug_get_log_buffer(size_t* _size);
 
-/* ELF functions */
-
-extern status_t platform_allocate_elf_region(uint32 *_address, uint32 size,
-	uint8 protection, void **_mappedAddress);
-extern status_t platform_allocate_elf_region(uint64 *_address, uint64 size,
-	uint8 protection, void **_mappedAddress);
-
 #endif
 
 #endif	/* KERNEL_BOOT_PLATFORM_H */