asus-tf101: add initial support (#1103)

aports/device/device-asus-tf101/APKBUILD

+# Reference: <https://postmarketos.org/devicepkg>
+pkgname="device-asus-tf101"
+pkgdesc="Asus Eee Pad Transformer"
+pkgver=0.1
+pkgrel=0
+url="https://postmarketos.org"
+license="MIT"
+arch="noarch"
+options="!check"
+depends="linux-asus-tf101 mkbootimg"
+makedepends="devicepkg-dev"
+source="deviceinfo"
+
+build() {
+	devicepkg_build $startdir $pkgname
+}
+
+package() {
+	devicepkg_package $startdir $pkgname
+}
+
+sha512sums="707e1540c3f124a374f3b7b25cbf7a5e2b929fc1ed0e0570db92fb6c42c071acb4609762cb90e197a1266159325a016d35ed4007fb8ec51b2d9ce88c3b9e8794  deviceinfo"

aports/device/device-asus-tf101/deviceinfo

+# Reference: <https://postmarketos.org/deviceinfo>
+# Please use double quotes only. You can source this file in shell scripts.
+
+deviceinfo_format_version="0"
+deviceinfo_name="Asus Eee Pad Transformer"
+deviceinfo_manufacturer="Asus"
+deviceinfo_date=""
+deviceinfo_dtb=""
+deviceinfo_modules_initfs=""
+deviceinfo_external_disk_install="false"
+deviceinfo_arch="armhf"
+
+# Device related
+deviceinfo_keyboard="false"
+deviceinfo_external_disk="true"
+deviceinfo_screen_width="1280"
+deviceinfo_screen_height="800"
+deviceinfo_dev_touchscreen=""
+deviceinfo_dev_touchscreen_calibration=""
+deviceinfo_dev_keyboard=""
+
+# Bootloader related
+deviceinfo_flash_method="adb"
+
+deviceinfo_kernel_cmdline="nvmem=128M@384M mem=1024M@0M vmalloc=128M gpt video=tegrafb console=tty0 usbcore.oldscheme_first=1 lp0_vec=8192@0x1fbed000 root=/dev/mmcblk0p7 ro quiet splash"
+deviceinfo_generate_bootimg="true"
+deviceinfo_bootimg_qcdt="false"
+deviceinfo_flash_offset_base="0x10000000"
+deviceinfo_flash_offset_kernel="0x00008000"
+deviceinfo_flash_offset_ramdisk="0x01000000"
+deviceinfo_flash_offset_second="0x00f00000"
+deviceinfo_flash_offset_tags="0x00000100"
+deviceinfo_flash_pagesize="2048"

aports/device/linux-asus-tf101/00_fix_return_address.patch

+From aeea3592a13bf12861943e44fc48f1f270941f8d Mon Sep 17 00:00:00 2001
+From: Behan Webster <behanw@converseincode.com>
+Date: Wed, 24 Sep 2014 01:06:46 +0100
+Subject: [PATCH] ARM: 8158/1: LLVMLinux: use static inline in ARM ftrace.h
+
+With compilers which follow the C99 standard (like modern versions of gcc and
+clang), "extern inline" does the wrong thing (emits code for an externally
+linkable version of the inline function). In this case using static inline
+and removing the NULL version of return_address in return_address.c does
+the right thing.
+
+Signed-off-by: Behan Webster <behanw@converseincode.com>
+Reviewed-by: Mark Charlebois <charlebm@gmail.com>
+Acked-by: Steven Rostedt <rostedt@goodmis.org>
+Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
+---
+ arch/arm/include/asm/ftrace.h    | 2 +-
+ arch/arm/kernel/return_address.c | 5 -----
+ 2 files changed, 1 insertion(+), 6 deletions(-)
+
+diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h
+index 39eb16b0066f2..bfe2a2f5a644e 100644
+--- a/arch/arm/include/asm/ftrace.h
++++ b/arch/arm/include/asm/ftrace.h
+@@ -45,7 +45,7 @@ void *return_address(unsigned int);
+ 
+ #else
+ 
+-extern inline void *return_address(unsigned int level)
++static inline void *return_address(unsigned int level)
+ {
+ 	return NULL;
+ }
+diff --git a/arch/arm/kernel/return_address.c b/arch/arm/kernel/return_address.c
+index fafedd86885dd..f6aa84d5b93c9 100644
+--- a/arch/arm/kernel/return_address.c
++++ b/arch/arm/kernel/return_address.c
+@@ -63,11 +63,6 @@ void *return_address(unsigned int level)
+ #warning "TODO: return_address should use unwind tables"
+ #endif
+ 
+-void *return_address(unsigned int level)
+-{
+-	return NULL;
+-}
+-
+ #endif /* if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND) / else */
+ 
+ EXPORT_SYMBOL_GPL(return_address);

aports/device/linux-asus-tf101/01-fix-alignment.patch

+diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c
+index cfbcf8b9559..54587d394d3 100644
+--- a/arch/arm/mm/alignment.c
++++ b/arch/arm/mm/alignment.c
+@@ -698,7 +698,6 @@ do_alignment_t32_to_handler(unsigned long *pinstr, struct pt_regs *regs,
+ 	unsigned long instr = *pinstr;
+ 	u16 tinst1 = (instr >> 16) & 0xffff;
+ 	u16 tinst2 = instr & 0xffff;
+-	poffset->un = 0;
+ 
+ 	switch (tinst1 & 0xffe0) {
+ 	/* A6.3.5 Load/Store multiple */
+@@ -795,6 +794,8 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
+ 
+ 	regs->ARM_pc += isize;
+ 
++	offset.un = 0;
++
+ 	switch (CODING_BITS(instr)) {
+ 	case 0x00000000:	/* 3.13.4 load/store instruction extensions */
+ 		if (LDSTHD_I_BIT(instr))

aports/device/linux-asus-tf101/02_fix_static_vma_address.patch

+diff --git a/mm/rmap.c b/mm/rmap.c
+index 8005080fb9e..13b34598b00 100644
+--- a/mm/rmap.c
++++ b/mm/rmap.c
+@@ -521,7 +521,7 @@ void page_unlock_anon_vma(struct anon_vma *anon_vma)
+  * Returns virtual address or -EFAULT if page's index/offset is not
+  * within the range mapped the @vma.
+  */
+-inline unsigned long
++static inline unsigned long
+ vma_address(struct page *page, struct vm_area_struct *vma)
+ {
+ 	pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);

aports/device/linux-asus-tf101/03_remove_deprecated_perl.patch

+diff --git a/kernel/timeconst.pl b/kernel/timeconst.pl
+index eb51d76e058..04612394c53 100644
+--- a/kernel/timeconst.pl
++++ b/kernel/timeconst.pl
+@@ -370,7 +370,7 @@ if ($hz eq '--can') {
+ 	}
+ 
+ 	@val = @{$canned_values{$hz}};
+-	if (!defined(@val)) {
++	if (!@val) {
+ 		@val = compute_values($hz);
+ 	}
+ 	output($hz, @val);

aports/device/linux-asus-tf101/APKBUILD

+# Kernel config based on: arch/arm/configs/tf101-linux_defconfig
+
+pkgname="linux-asus-tf101"
+pkgver=3.1.10
+pkgrel=0
+pkgdesc="Asus Eee Pad Transformer kernel fork"
+arch="armhf"
+_carch="arm"
+_flavor="asus-tf101"
+url="https://kernel.org"
+license="GPL2"
+options="!strip !check !tracedeps"
+makedepends="perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev xz"
+HOSTCC="${CC:-gcc}"
+HOSTCC="${HOSTCC#${CROSS_COMPILE}}"
+
+# Source
+_repository="TF101-GNU-kernel"
+_commit="5ddd9654ec52599fbef71657ad2e03b3cdacee31"
+_config="config-${_flavor}.${arch}"
+source="
+	$pkgname-$_commit.tar.gz::https://github.com/jmrohwer/${_repository}/archive/${_commit}.tar.gz
+	$_config
+	compiler-gcc6.h
+	00_fix_return_address.patch
+	01-fix-alignment.patch
+	02_fix_static_vma_address.patch
+	03_remove_deprecated_perl.patch
+"
+builddir="$srcdir/${_repository}-${_commit}"
+
+prepare() {
+	default_prepare
+
+	# gcc6 support
+	cp -v "$srcdir/compiler-gcc6.h" "$builddir/include/linux/"
+
+	# Remove -Werror from all makefiles
+	find . -type f -name Makefile -print0 | \
+		xargs -0 sed -i 's/-Werror-/-W/g'
+	find . -type f -name Makefile -print0 | \
+		xargs -0 sed -i 's/-Werror//g'
+
+	# Prepare kernel config ('yes ""' for kernels lacking olddefconfig)
+	cp "$srcdir"/$_config "$builddir"/.config
+	yes "" | make ARCH="$_carch" HOSTCC="$HOSTCC" oldconfig
+}
+
+menuconfig() {
+	cd "$builddir"
+	make ARCH="$_carch" menuconfig
+	cp .config "$startdir"/$_config
+}
+
+build() {
+	unset LDFLAGS
+	make ARCH="$_carch" CC="${CC:-gcc}" \
+		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS"
+	make ARCH="$_carch" CC="${CC:-gcc}" \
+		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS" modules
+}
+
+package() {
+	# kernel.release
+	install -D "$builddir/include/config/kernel.release" \
+		"$pkgdir/usr/share/kernel/$_flavor/kernel.release"
+
+	# zImage (find the right one)
+	cd "$builddir/arch/$_carch/boot"
+	_target="$pkgdir/boot/vmlinuz-$_flavor"
+	for _zimg in zImage-dtb Image.gz-dtb *zImage Image; do
+		[ -e "$_zimg" ] || continue
+		msg "zImage found: $_zimg"
+		install -Dm644 "$_zimg" "$_target"
+		break
+	done
+	if ! [ -e "$_target" ]; then
+		error "Could not find zImage in $PWD!"
+		return 1
+	fi
+
+	# Modules
+	cd "$builddir"
+	unset LDFLAGS
+	make ARCH="$_carch" CC="${CC:-gcc}" \
+		CONFIG_NO_ERROR_ON_MISMATCH=y \
+		KBUILD_BUILD_VERSION="$((pkgrel + 1))-postmarketOS" \
+		INSTALL_MOD_PATH="$pkgdir" INSTALL_MOD_STRIP=1 \
+		modules_install
+}
+
+sha512sums="44a2bccef4f5d9258aee8d7c8cdb2572f7136cf1a3487e6290457a21de28ecc4201951f5ea89d9392a44d0980f66a590cf23696209639b63dafefd4d39662902  linux-asus-tf101-5ddd9654ec52599fbef71657ad2e03b3cdacee31.tar.gz
+533575b9b66d99eb4237325ed7972f68adb01c0d3948f58e8c014f7f26338c3e224dea738d76e3ebdd35816f16bacb1ee46abcaeeeee52adec1aee2b43d8b805  config-asus-tf101.armhf
+d80980e9474c82ba0ef1a6903b434d8bd1b092c40367ba543e72d2c119301c8b2d05265740e4104ca1ac5d15f6c4aa49e8776cb44264a9a28dc551e0d1850dcc  compiler-gcc6.h
+ea1d3b5a234fa565e3c1a792de48f4fc4e6023d281d303c8e319c7ef28edc5739ab0e4dea0139a41f0a5c7d03e27921ccaa214fd0ac5c72245a094ce60128864  00_fix_return_address.patch
+cdddc37d3c173c931631037d7c337e45589420eba956231436b8d3b857b942db7fd33e4800d0badaa6f09d33a5373a9f0bf173748e8e72b237bd7d699e7fe4a8  01-fix-alignment.patch
+59231af0dee68fc424d1ad78f62c491ace795d4cc4af4c26e59b08da5c10cfc406dfc980305f851254bbfa7f03b1bc75f8072f4b4d0f06629ebdbb9ca5a6fea9  02_fix_static_vma_address.patch
+cd0bc463eae0372554d09dac7914ae391f999ca4a77238f761dee636a398eb45e6c02280b7035c8d162ce539f646f3e4170f180ba2e78262c22e308f094d2cd2  03_remove_deprecated_perl.patch"

aports/device/linux-asus-tf101/compiler-gcc6.h

+// SOURCE:
+// https://github.com/NextThingCo/CHIP-u-boot/issues/10#issuecomment-287515505
+
+#ifndef __LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-gcc6.h> directly, include <linux/compiler.h> instead."
+#endif
+
+#define __used				__attribute__((__used__))
+#define __must_check			__attribute__((warn_unused_result))
+#define __compiler_offsetof(a, b)	__builtin_offsetof(a, b)
+
+/* Mark functions as cold. gcc will assume any path leading to a call
+   to them will be unlikely.  This means a lot of manual unlikely()s
+   are unnecessary now for any paths leading to the usual suspects
+   like BUG(), printk(), panic() etc. [but let's keep them for now for
+   older compilers]
+
+   Early snapshots of gcc 4.3 don't support this and we can't detect this
+   in the preprocessor, but we can live with this because they're unreleased.
+   Maketime probing would be overkill here.
+
+   gcc also has a __attribute__((__hot__)) to move hot functions into
+   a special section, but I don't see any sense in this right now in
+   the kernel context */
+#define __cold			__attribute__((__cold__))
+
+#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
+
+#ifndef __CHECKER__
+# define __compiletime_warning(message) __attribute__((warning(message)))
+# define __compiletime_error(message) __attribute__((error(message)))
+#endif /* __CHECKER__ */
+
+/*
+ * Mark a position in code as unreachable.  This can be used to
+ * suppress control flow warnings after asm blocks that transfer
+ * control elsewhere.
+ *
+ * Early snapshots of gcc 4.5 don't support this and we can't detect
+ * this in the preprocessor, but we can live with this because they're
+ * unreleased.  Really, we need to have autoconf for the kernel.
+ */
+#define unreachable() __builtin_unreachable()
+
+/* Mark a function definition as prohibited from being cloned. */
+#define __noclone	__attribute__((__noclone__))
+
+/*
+ * Tell the optimizer that something else uses this function or variable.
+ */
+#define __visible __attribute__((externally_visible))
+
+/*
+ * GCC 'asm goto' miscompiles certain code sequences:
+ *
+ *   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
+ *
+ * Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
+ *
+ * (asm goto is automatically volatile - the naming reflects this.)
+ */
+#define asm_volatile_goto(x...)	do { asm goto(x); asm (""); } while (0)
+
+#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP
+#define __HAVE_BUILTIN_BSWAP32__
+#define __HAVE_BUILTIN_BSWAP64__
+#define __HAVE_BUILTIN_BSWAP16__
+#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
+