arm64: Build infrastructure

This patch adds Makefile and Kconfig files required for building an
AArch64 kernel.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 126 insertions, 0 deletions

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
new file mode 100644
index 000000000000..3fae2be8b016
--- /dev/null
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -0,0 +1,126 @@
+/*
+ * ld script to make ARM Linux kernel
+ * taken from the i386 version by Russell King
+ * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+ */
+
+#include <asm-generic/vmlinux.lds.h>
+#include <asm/thread_info.h>
+#include <asm/memory.h>
+#include <asm/page.h>
+
+#define ARM_EXIT_KEEP(x)
+#define ARM_EXIT_DISCARD(x)     x
+
+OUTPUT_ARCH(aarch64)
+ENTRY(stext)
+
+jiffies = jiffies_64;
+
+SECTIONS
+{
+        /*
+         * XXX: The linker does not define how output sections are
+         * assigned to input sections when there are multiple statements
+         * matching the same input section name.  There is no documented
+         * order of matching.
+         */
+        /DISCARD/ : {
+                ARM_EXIT_DISCARD(EXIT_TEXT)
+                ARM_EXIT_DISCARD(EXIT_DATA)
+                EXIT_CALL
+                *(.discard)
+                *(.discard.*)
+        }
+
+        . = PAGE_OFFSET + TEXT_OFFSET;
+
+        .head.text : {
+                _text = .;
+                HEAD_TEXT
+        }
+        .text : {                       /* Real text segment            */
+                _stext = .;             /* Text and read-only data      */
+                        *(.smp.pen.text)
+                        __exception_text_start = .;
+                        *(.exception.text)
+                        __exception_text_end = .;
+                        IRQENTRY_TEXT
+                        TEXT_TEXT
+                        SCHED_TEXT
+                        LOCK_TEXT
+                        *(.fixup)
+                        *(.gnu.warning)
+                . = ALIGN(16);
+                *(.got)                 /* Global offset table          */
+        }
+
+        RO_DATA(PAGE_SIZE)
+
+        _etext = .;                     /* End of text and rodata section */
+
+        . = ALIGN(PAGE_SIZE);
+        __init_begin = .;
+
+        INIT_TEXT_SECTION(8)
+        .exit.text : {
+                ARM_EXIT_KEEP(EXIT_TEXT)
+        }
+        . = ALIGN(16);
+        .init.data : {
+                INIT_DATA
+                INIT_SETUP(16)
+                INIT_CALLS
+                CON_INITCALL
+                SECURITY_INITCALL
+                INIT_RAM_FS
+        }
+        .exit.data : {
+                ARM_EXIT_KEEP(EXIT_DATA)
+        }
+
+        PERCPU_SECTION(64)
+
+        __init_end = .;
+        . = ALIGN(THREAD_SIZE);
+        __data_loc = .;
+
+        .data : AT(__data_loc) {
+                _data = .;              /* address in memory */
+                _sdata = .;
+
+                /*
+                 * first, the init task union, aligned
+                 * to an 8192 byte boundary.
+                 */
+                INIT_TASK_DATA(THREAD_SIZE)
+                NOSAVE_DATA
+                CACHELINE_ALIGNED_DATA(64)
+                READ_MOSTLY_DATA(64)
+
+                /*
+                 * The exception fixup table (might need resorting at runtime)
+                 */
+                . = ALIGN(32);
+                __start___ex_table = .;
+                *(__ex_table)
+                __stop___ex_table = .;
+
+                /*
+                 * and the usual data section
+                 */
+                DATA_DATA
+                CONSTRUCTORS
+
+                _edata = .;
+        }
+        _edata_loc = __data_loc + SIZEOF(.data);
+
+        NOTES
+
+        BSS_SECTION(0, 0, 0)
+        _end = .;
+
+        STABS_DEBUG
+        .comment 0 : { *(.comment) }
+}