The patch adds the kernel booting and the initial setup code.
Documentation/arm64/booting.txt describes the booting protocol on the
AArch64 Linux kernel. This is subject to change following the work on
boot standardisation, ACPI.
Signed-off-by: Will Deacon<will.deacon@xxxxxxx>
Signed-off-by: Catalin Marinas<catalin.marinas@xxxxxxx>
---
Documentation/arm64/booting.txt | 141 +++++++++++
arch/arm64/include/asm/setup.h | 26 ++
arch/arm64/kernel/head.S | 521 +++++++++++++++++++++++++++++++++++++++
arch/arm64/kernel/setup.c | 357 +++++++++++++++++++++++++++
4 files changed, 1045 insertions(+), 0 deletions(-)
create mode 100644 Documentation/arm64/booting.txt
create mode 100644 arch/arm64/include/asm/setup.h
create mode 100644 arch/arm64/kernel/head.S
create mode 100644 arch/arm64/kernel/setup.c
diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
new file mode 100644
index 0000000..3197820
--- /dev/null
+++ b/Documentation/arm64/booting.txt
+
+The boot loader is expected to enter the kernel on each CPU in the
+following manner:
+
+- The primary CPU must jump directly to the first instruction of the
+ kernel image. The device tree blob passed by this CPU must contain
+ for each CPU node:
+
+ 1. An 'enable-method' property. Currently, the only supported value
+ for this field is the string "spin-table".
+
+ 2. A 'cpu-release-addr' property identifying a 64-bit,
+ zero-initialised memory location.
+
+ It is expected that the bootloader will generate these device tree
+ properties and insert them into the blob prior to kernel entry.
+
+- Any secondary CPUs must spin outside of the kernel in a reserved area
+ of memory (communicated to the kernel by a /memreserve/ region in the
+ device tree) polling their cpu-release-addr location, which must be
+ contained in the reserved region. A wfe instruction may be inserted
+ to reduce the overhead of the busy-loop and a sev will be issued by
+ the primary CPU. When a read of the location pointed to by the
+ cpu-release-addr returns a non-zero value, the CPU must jump directly
+ to this value.
diff --git a/arch/arm64/include/asm/setup.h b/arch/arm64/include/asm/setup.h
new file mode 100644
index 0000000..d766493
--- /dev/null
+++ b/arch/arm64/include/asm/setup.h
@@ -0,0 +1,26 @@
+/*
+ * Based on arch/arm/include/asm/setup.h
+ *
+ * Copyright (C) 1997-1999 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see<http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_SETUP_H
+#define __ASM_SETUP_H
+
+#include<linux/types.h>
+
+#define COMMAND_LINE_SIZE 1024
+
+#endif
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
new file mode 100644
index 0000000..34ccdc0
--- /dev/null
+++ b/arch/arm64/kernel/head.S
@@ -0,0 +1,521 @@
+/*
+ * Low-level CPU initialisation
+ * Based on arch/arm/kernel/head.S
+ *
+ * Copyright (C) 1994-2002 Russell King
+ * Copyright (C) 2003-2012 ARM Ltd.
+ * Authors: Catalin Marinas<catalin.marinas@xxxxxxx>
+ * Will Deacon<will.deacon@xxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see<http://www.gnu.org/licenses/>.
+ */
+
+
+ /*
+ * DO NOT MODIFY. Image header expected by Linux boot-loaders.
+ */
+ b stext // branch to kernel start, magic
+ .long 0 // reserved
+ .quad TEXT_OFFSET // Image load offset from start of RAM
+ .quad 0 // reserved
+ .quad 0 // reserved
+