Merge tag 'xtensa-20190715' of git://github.com/jcmvbkbc/linux-xtensa

Pull Xtensa updates from Max Filippov:

 - clean up PCI support code

 - add defconfig and DTS for the 'virt' board

 - abstract 'entry' and 'retw' uses in xtensa assembly in preparation
   for XEA3/NX pipeline support

 - random small cleanups

* tag 'xtensa-20190715' of git://github.com/jcmvbkbc/linux-xtensa:
  xtensa: virt: add defconfig and DTS
  xtensa: abstract 'entry' and 'retw' in assembly code
  xtensa: One function call less in bootmem_init()
  xtensa: remove arch/xtensa/include/asm/types.h
  xtensa: use generic pcibios_set_master and pcibios_enable_device
  xtensa: drop dead PCI support code
  xtensa/PCI: Remove unused variable

19 files changed, 339 insertions, 269 deletions

diff --git a/arch/xtensa/boot/dts/virt.dts b/arch/xtensa/boot/dts/virt.dts
new file mode 100644
index 000000000000..6aecbc0f3549
--- /dev/null
+++ b/arch/xtensa/boot/dts/virt.dts
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+/ {
+	compatible = "cdns,xtensa-iss";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	interrupt-parent = <&pic>;
+
+	chosen {
+		bootargs = "console=ttyS0,115200n8 debug";
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x00000000 0x80000000>;
+	};
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		cpu@0 {
+			compatible = "cdns,xtensa-cpu";
+			reg = <0>;
+			clocks = <&osc>;
+		};
+	};
+
+	clocks {
+		osc: osc {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <40000000>;
+		};
+	};
+
+	pic: pic {
+		compatible = "cdns,xtensa-pic";
+		/* one cell: internal irq number,
+		 * two cells: second cell == 0: internal irq number
+		 *            second cell == 1: external irq number
+		 */
+		#address-cells = <0>;
+		#interrupt-cells = <2>;
+		interrupt-controller;
+	};
+
+	pci {
+		compatible = "pci-host-ecam-generic";
+		device_type = "pci";
+		#address-cells = <3>;
+		#size-cells = <2>;
+		#interrupt-cells = <0x1>;
+
+		bus-range = <0x0 0x3f>;
+		reg = <0xc0000000 0x04000000>;
+
+		     // BUS_ADDRESS(3)  CPU_PHYSICAL(1)  SIZE(2)
+		ranges = <0x01000000 0x0 0xc4000000  0xc4000000  0x0 0x04000000>,
+			 <0x02000000 0x0 0xc8000000  0xc8000000  0x0 0x18000000>;
+
+		     // PCI_DEVICE(3)  INT#(1)  CONTROLLER(PHANDLE)  CONTROLLER_DATA(2)
+		interrupt-map = <
+			0x0000 0x0 0x0  0x1  &pic  0x0 0x1
+			0x0800 0x0 0x0  0x1  &pic  0x1 0x1
+			0x1000 0x0 0x0  0x1  &pic  0x2 0x1
+			0x1800 0x0 0x0  0x1  &pic  0x3 0x1
+			>;
+
+		interrupt-map-mask = <0x1800 0x0 0x0  0x7>;
+	};
+};
diff --git a/arch/xtensa/configs/virt_defconfig b/arch/xtensa/configs/virt_defconfig
new file mode 100644
index 000000000000..bfc45a138e72
--- /dev/null
+++ b/arch/xtensa/configs/virt_defconfig
@@ -0,0 +1,113 @@
+CONFIG_SYSVIPC=y
+CONFIG_POSIX_MQUEUE=y
+CONFIG_NO_HZ_IDLE=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_PREEMPT=y
+CONFIG_IRQ_TIME_ACCOUNTING=y
+CONFIG_BSD_PROCESS_ACCT=y
+CONFIG_MEMCG=y
+CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_CGROUP_DEBUG=y
+CONFIG_NAMESPACES=y
+CONFIG_SCHED_AUTOGROUP=y
+CONFIG_RELAY=y
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_EXPERT=y
+CONFIG_SYSCTL_SYSCALL=y
+CONFIG_KALLSYMS_ALL=y
+CONFIG_PERF_EVENTS=y
+CONFIG_XTENSA_VARIANT_DC233C=y
+CONFIG_XTENSA_UNALIGNED_USER=y
+CONFIG_VECTORS_OFFSET=0x00002000
+CONFIG_XTENSA_KSEG_512M=y
+CONFIG_HIGHMEM=y
+CONFIG_CMDLINE_BOOL=y
+CONFIG_CMDLINE="console=ttyS0,115200n8 ip=dhcp root=/dev/nfs rw debug memmap=0x80000000@0"
+CONFIG_USE_OF=y
+CONFIG_BUILTIN_DTB_SOURCE="virt"
+# CONFIG_PARSE_BOOTPARAM is not set
+CONFIG_JUMP_LABEL=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
+# CONFIG_COMPACTION is not set
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_IP_MULTICAST=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
+CONFIG_IP_PNP_BOOTP=y
+CONFIG_IP_PNP_RARP=y
+# CONFIG_IPV6 is not set
+CONFIG_NETFILTER=y
+# CONFIG_WIRELESS is not set
+CONFIG_PCI=y
+CONFIG_PCI_HOST_GENERIC=y
+CONFIG_UEVENT_HELPER=y
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+# CONFIG_STANDALONE is not set
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_RAM=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_SCSI=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_NETDEVICES=y
+CONFIG_VIRTIO_NET=y
+# CONFIG_ETHERNET is not set
+# CONFIG_WLAN is not set
+CONFIG_INPUT_MOUSEDEV=y
+CONFIG_INPUT_EVDEV=y
+# CONFIG_INPUT_KEYBOARD is not set
+# CONFIG_LEGACY_PTYS is not set
+CONFIG_HW_RANDOM=y
+CONFIG_HW_RANDOM_VIRTIO=y
+# CONFIG_HWMON is not set
+CONFIG_DRM=y
+CONFIG_DRM_VGEM=y
+CONFIG_DRM_VIRTIO_GPU=y
+CONFIG_FB_MODE_HELPERS=y
+# CONFIG_VGA_CONSOLE is not set
+CONFIG_FRAMEBUFFER_CONSOLE=y
+CONFIG_LOGO=y
+# CONFIG_USB_SUPPORT is not set
+CONFIG_VIRTIO_PCI=y
+CONFIG_VIRTIO_INPUT=y
+# CONFIG_IOMMU_SUPPORT is not set
+CONFIG_EXT3_FS=y
+CONFIG_FANOTIFY=y
+CONFIG_VFAT_FS=y
+CONFIG_PROC_KCORE=y
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_NFS_FS=y
+CONFIG_NFS_V4=y
+CONFIG_NFS_SWAP=y
+CONFIG_ROOT_NFS=y
+CONFIG_SUNRPC_DEBUG=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ISO8859_1=y
+CONFIG_CRYPTO_ECHAINIV=y
+CONFIG_CRYPTO_DEFLATE=y
+CONFIG_CRYPTO_LZO=y
+CONFIG_CRYPTO_ANSI_CPRNG=y
+CONFIG_CRYPTO_DEV_VIRTIO=y
+CONFIG_FONTS=y
+CONFIG_PRINTK_TIME=y
+CONFIG_DYNAMIC_DEBUG=y
+CONFIG_DEBUG_INFO=y
+CONFIG_MAGIC_SYSRQ=y
+# CONFIG_SCHED_DEBUG is not set
+CONFIG_SCHEDSTATS=y
+CONFIG_DEBUG_RT_MUTEXES=y
+CONFIG_DEBUG_SPINLOCK=y
+CONFIG_DEBUG_MUTEXES=y
+CONFIG_DEBUG_ATOMIC_SLEEP=y
+CONFIG_STACKTRACE=y
+CONFIG_RCU_TRACE=y
+# CONFIG_FTRACE is not set
+# CONFIG_S32C1I_SELFTEST is not set
diff --git a/arch/xtensa/include/asm/asmmacro.h b/arch/xtensa/include/asm/asmmacro.h
index 8308a9c3abb2..71a7e846bc1f 100644
--- a/arch/xtensa/include/asm/asmmacro.h
+++ b/arch/xtensa/include/asm/asmmacro.h
@@ -191,4 +191,50 @@
 #endif
 	.endm
 
+#define XTENSA_STACK_ALIGNMENT		16
+
+#if defined(__XTENSA_WINDOWED_ABI__)
+#define XTENSA_FRAME_SIZE_RESERVE	16
+#define XTENSA_SPILL_STACK_RESERVE	32
+
+#define abi_entry(frame_size) \
+	entry sp, (XTENSA_FRAME_SIZE_RESERVE + \
+		   (((frame_size) + XTENSA_STACK_ALIGNMENT - 1) & \
+		    -XTENSA_STACK_ALIGNMENT))
+#define abi_entry_default abi_entry(0)
+
+#define abi_ret(frame_size) retw
+#define abi_ret_default retw
+
+#elif defined(__XTENSA_CALL0_ABI__)
+
+#define XTENSA_SPILL_STACK_RESERVE	0
+
+#define abi_entry(frame_size) __abi_entry (frame_size)
+
+	.macro	__abi_entry frame_size
+	.ifgt \frame_size
+	addi sp, sp, -(((\frame_size) + XTENSA_STACK_ALIGNMENT - 1) & \
+		       -XTENSA_STACK_ALIGNMENT)
+	.endif
+	.endm
+
+#define abi_entry_default
+
+#define abi_ret(frame_size) __abi_ret (frame_size)
+
+	.macro	__abi_ret frame_size
+	.ifgt \frame_size
+	addi sp, sp, (((\frame_size) + XTENSA_STACK_ALIGNMENT - 1) & \
+		      -XTENSA_STACK_ALIGNMENT)
+	.endif
+	ret
+	.endm
+
+#define abi_ret_default ret
+
+#else
+#error Unsupported Xtensa ABI
+#endif
+
 #endif /* _XTENSA_ASMMACRO_H */
diff --git a/arch/xtensa/include/asm/platform.h b/arch/xtensa/include/asm/platform.h
index 560483356a06..913826dfa838 100644
--- a/arch/xtensa/include/asm/platform.h
+++ b/arch/xtensa/include/asm/platform.h
@@ -55,16 +55,6 @@ extern void platform_idle (void);
 extern void platform_heartbeat (void);
 
 /*
- * platform_pcibios_init is called to allow the platform to setup the pci bus.
- */
-extern void platform_pcibios_init (void);
-
-/*
- * platform_pcibios_fixup allows to modify the PCI configuration.
- */
-extern int platform_pcibios_fixup (void);
-
-/*
  * platform_calibrate_ccount calibrates cpu clock freq (CONFIG_XTENSA_CALIBRATE)
  */
 extern void platform_calibrate_ccount (void);
diff --git a/arch/xtensa/include/asm/types.h b/arch/xtensa/include/asm/types.h
deleted file mode 100644
index 2b410b8c7f79..000000000000
--- a/arch/xtensa/include/asm/types.h
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * include/asm-xtensa/types.h
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
- */
-#ifndef _XTENSA_TYPES_H
-#define _XTENSA_TYPES_H
-
-#include <uapi/asm/types.h>
-
-#ifndef __ASSEMBLY__
-/*
- * These aren't exported outside the kernel to avoid name space clashes
- */
-
-#define BITS_PER_LONG 32
-
-#endif
-#endif	/* _XTENSA_TYPES_H */
diff --git a/arch/xtensa/kernel/coprocessor.S b/arch/xtensa/kernel/coprocessor.S
index 92bf24a9da92..60c220020054 100644
--- a/arch/xtensa/kernel/coprocessor.S
+++ b/arch/xtensa/kernel/coprocessor.S
@@ -121,7 +121,9 @@
 
 ENTRY(coprocessor_flush)
 
-	entry	a1, 32
+	/* reserve 4 bytes on stack to save a0 */
+	abi_entry(4)
+
 	s32i	a0, a1, 0
 	movi	a0, .Lsave_cp_regs_jump_table
 	addx8	a3, a3, a0
@@ -131,7 +133,8 @@ ENTRY(coprocessor_flush)
 	beqz	a3, 1f
 	callx0	a3
 1:	l32i	a0, a1, 0
-	retw
+
+	abi_ret(4)
 
 ENDPROC(coprocessor_flush)
 
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index e54af8b7e0f8..183fa8e0bb5b 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -1842,7 +1842,8 @@ ENDPROC(fast_store_prohibited)
 
 ENTRY(system_call)
 
-	entry	a1, 32
+	/* reserve 4 bytes on stack for function parameter */
+	abi_entry(4)
 
 	/* regs->syscall = regs->areg[2] */
 
@@ -1892,7 +1893,7 @@ ENTRY(system_call)
 
 	s32i	a6, a2, PT_AREG2
 	bnez	a3, 1f
-	retw
+	abi_ret(4)
 
 1:
 	l32i	a4, a1, 4
@@ -1901,7 +1902,7 @@ ENTRY(system_call)
 	mov	a6, a2
 	call4	do_syscall_trace_leave
 	s32i	a3, a2, PT_SYSCALL
-	retw
+	abi_ret(4)
 
 ENDPROC(system_call)
 
@@ -1952,7 +1953,7 @@ ENDPROC(system_call)
 
 ENTRY(_switch_to)
 
-	entry	a1, 48
+	abi_entry(XTENSA_SPILL_STACK_RESERVE)
 
 	mov	a11, a3			# and 'next' (a3)
 
@@ -2013,7 +2014,7 @@ ENTRY(_switch_to)
 	wsr	a14, ps
 	rsync
 
-	retw
+	abi_ret(XTENSA_SPILL_STACK_RESERVE)
 
 ENDPROC(_switch_to)
 
diff --git a/arch/xtensa/kernel/mcount.S b/arch/xtensa/kernel/mcount.S
index 0eeda2e4a25e..5e4619f52858 100644
--- a/arch/xtensa/kernel/mcount.S
+++ b/arch/xtensa/kernel/mcount.S
@@ -11,6 +11,7 @@
  */
 
 #include <linux/linkage.h>
+#include <asm/asmmacro.h>
 #include <asm/ftrace.h>
 
 /*
@@ -21,13 +22,13 @@
 
 ENTRY(_mcount)
 
-	entry	a1, 16
+	abi_entry_default
 
 	movi	a4, ftrace_trace_function
 	l32i	a4, a4, 0
 	movi	a3, ftrace_stub
 	bne	a3, a4, 1f
-	retw
+	abi_ret_default
 
 1: 	xor	a7, a2, a1
 	movi	a3, 0x3fffffff
@@ -40,11 +41,11 @@ ENTRY(_mcount)
 	addi	a6, a6, -MCOUNT_INSN_SIZE
 	callx4	a4
 
-	retw
+	abi_ret_default
 
 ENDPROC(_mcount)
 
 ENTRY(ftrace_stub)
-	entry	a1, 16
-	retw
+	abi_entry_default
+	abi_ret_default
 ENDPROC(ftrace_stub)
diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c
index 8b823f94e568..3f32e275997a 100644
--- a/arch/xtensa/kernel/pci.c
+++ b/arch/xtensa/kernel/pci.c
@@ -24,23 +24,6 @@
 #include <asm/pci-bridge.h>
 #include <asm/platform.h>
 
-/* PCI Controller */
-
-
-/*
- * pcibios_alloc_controller
- * pcibios_enable_device
- * pcibios_fixups
- * pcibios_align_resource
- * pcibios_fixup_bus
- * pci_bus_add_device
- */
-
-static struct pci_controller *pci_ctrl_head;
-static struct pci_controller **pci_ctrl_tail = &pci_ctrl_head;
-
-static int pci_bus_count;
-
 /*
  * We need to avoid collisions with `mirrored' VGA ports
  * and other strange ISA hardware, so we always want the
@@ -75,81 +58,6 @@ pcibios_align_resource(void *data, const struct resource *res,
 	return start;
 }
 
-static void __init pci_controller_apertures(struct pci_controller *pci_ctrl,
-					    struct list_head *resources)
-{
-	struct resource *res;
-	unsigned long io_offset;
-	int i;
-
-	io_offset = (unsigned long)pci_ctrl->io_space.base;
-	res = &pci_ctrl->io_resource;
-	if (!res->flags) {
-		if (io_offset)
-			pr_err("I/O resource not set for host bridge %d\n",
-			       pci_ctrl->index);
-		res->start = 0;
-		res->end = IO_SPACE_LIMIT;
-		res->flags = IORESOURCE_IO;
-	}
-	res->start += io_offset;
-	res->end += io_offset;
-	pci_add_resource_offset(resources, res, io_offset);
-
-	for (i = 0; i < 3; i++) {
-		res = &pci_ctrl->mem_resources[i];
-		if (!res->flags) {
-			if (i > 0)
-				continue;
-			pr_err("Memory resource not set for host bridge %d\n",
-			       pci_ctrl->index);
-			res->start = 0;
-			res->end = ~0U;
-			res->flags = IORESOURCE_MEM;
-		}
-		pci_add_resource(resources, res);
-	}
-}
-
-static int __init pcibios_init(void)
-{
-	struct pci_controller *pci_ctrl;
-	struct list_head resources;
-	struct pci_bus *bus;
-	int next_busno = 0, ret;
-
-	pr_info("PCI: Probing PCI hardware\n");
-
-	/* Scan all of the recorded PCI controllers.  */
-	for (pci_ctrl = pci_ctrl_head; pci_ctrl; pci_ctrl = pci_ctrl->next) {
-		pci_ctrl->last_busno = 0xff;
-		INIT_LIST_HEAD(&resources);
-		pci_controller_apertures(pci_ctrl, &resources);
-		bus = pci_scan_root_bus(NULL, pci_ctrl->first_busno,
-					pci_ctrl->ops, pci_ctrl, &resources);
-		if (!bus)
-			continue;
-
-		pci_ctrl->bus = bus;
-		pci_ctrl->last_busno = bus->busn_res.end;
-		if (next_busno <= pci_ctrl->last_busno)
-			next_busno = pci_ctrl->last_busno+1;
-	}
-	pci_bus_count = next_busno;
-	ret = platform_pcibios_fixup();
-	if (ret)
-		return ret;
-
-	for (pci_ctrl = pci_ctrl_head; pci_ctrl; pci_ctrl = pci_ctrl->next) {
-		if (pci_ctrl->bus)
-			pci_bus_add_devices(pci_ctrl->bus);
-	}
-
-	return 0;
-}
-
-subsys_initcall(pcibios_init);
-
 void pcibios_fixup_bus(struct pci_bus *bus)
 {
 	if (bus->parent) {
@@ -158,38 +66,6 @@ void pcibios_fixup_bus(struct pci_bus *bus)
 	}
 }
 
-void pcibios_set_master(struct pci_dev *dev)
-{
-	/* No special bus mastering setup handling */
-}
-
-int pcibios_enable_device(struct pci_dev *dev, int mask)
-{
-	u16 cmd, old_cmd;
-	int idx;
-	struct resource *r;
-
-	pci_read_config_word(dev, PCI_COMMAND, &cmd);
-	old_cmd = cmd;
-	for (idx=0; idx<6; idx++) {
-		r = &dev->resource[idx];
-		if (!r->start && r->end) {
-			pci_err(dev, "can't enable device: resource collisions\n");
-			return -EINVAL;
-		}
-		if (r->flags & IORESOURCE_IO)
-			cmd |= PCI_COMMAND_IO;
-		if (r->flags & IORESOURCE_MEM)
-			cmd |= PCI_COMMAND_MEMORY;
-	}
-	if (cmd != old_cmd) {
-		pci_info(dev, "enabling device (%04x -> %04x)\n", old_cmd, cmd);
-		pci_write_config_word(dev, PCI_COMMAND, cmd);
-	}
-
-	return 0;
-}
-
 /*
  * Platform support for /proc/bus/pci/X/Y mmap()s.
  *  -- paulus.
diff --git a/arch/xtensa/kernel/platform.c b/arch/xtensa/kernel/platform.c
index 1cf008284dd2..a95ba05b0abe 100644
--- a/arch/xtensa/kernel/platform.c
+++ b/arch/xtensa/kernel/platform.c
@@ -34,8 +34,6 @@ _F(void, halt, (void), { while(1); });
 _F(void, power_off, (void), { while(1); });
 _F(void, idle, (void), { __asm__ __volatile__ ("waiti 0" ::: "memory"); });
 _F(void, heartbeat, (void), { });
-_F(int,  pcibios_fixup, (void), { return 0; });
-_F(void, pcibios_init, (void), { });
 
 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
 _F(void, calibrate_ccount, (void),
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 176cb46bcf12..5cb8a62e091c 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -405,10 +405,6 @@ void __init setup_arch(char **cmdline_p)
 	conswitchp = &dummy_con;
 # endif
 #endif
-
-#ifdef CONFIG_PCI
-	platform_pcibios_init();
-#endif
 }
 
 static DEFINE_PER_CPU(struct cpu, cpu_data);
diff --git a/arch/xtensa/lib/checksum.S b/arch/xtensa/lib/checksum.S
index c6e73b12e519..4cb9ca58d9ad 100644
--- a/arch/xtensa/lib/checksum.S
+++ b/arch/xtensa/lib/checksum.S
@@ -43,7 +43,7 @@ ENTRY(csum_partial)
 	 * Experiments with Ethernet and SLIP connections show that buf
 	 * is aligned on either a 2-byte or 4-byte boundary.
 	 */
-	entry	sp, 32
+	abi_entry_default
 	extui	a5, a2, 0, 2
 	bnez	a5, 8f		/* branch if 2-byte aligned */
 	/* Fall-through on common case, 4-byte alignment */
@@ -107,7 +107,7 @@ ENTRY(csum_partial)
 	ONES_ADD(a4, a6)
 7:
 	mov	a2, a4
-	retw
+	abi_ret_default
 
 	/* uncommon case, buf is 2-byte aligned */
 8:
@@ -195,7 +195,7 @@ unsigned int csum_partial_copy_generic (const char *src, char *dst, int len,
 
 ENTRY(csum_partial_copy_generic)
 
-	entry	sp, 32
+	abi_entry_default
 	mov	a12, a3
 	mov	a11, a4
 	or	a10, a2, a3
@@ -316,7 +316,7 @@ EX(11f)	s8i	a9, a3, 0
 	ONES_ADD(a5, a9)
 8:
 	mov	a2, a5
-	retw
+	abi_ret_default
 
 5:
 	/* Control branch to here when either src or dst is odd.  We
@@ -383,12 +383,12 @@ ENDPROC(csum_partial_copy_generic)
 	blt	a12, a11, .Leloop
 #endif
 2:
-	retw
+	abi_ret_default
 
 11:
 	movi	a2, -EFAULT
 	s32i	a2, a7, 0	/* dst_err_ptr */
 	movi	a2, 0
-	retw
+	abi_ret_default
 
 .previous
diff --git a/arch/xtensa/lib/memcopy.S b/arch/xtensa/lib/memcopy.S
index efecfd7ed8cc..582d817979ed 100644
--- a/arch/xtensa/lib/memcopy.S
+++ b/arch/xtensa/lib/memcopy.S
@@ -79,7 +79,7 @@
 	bne	a3, a7, .Lnextbyte # continue loop if $a3:src != $a7:src_end
 #endif /* !XCHAL_HAVE_LOOPS */
 .Lbytecopydone:
-	retw
+	abi_ret_default
 
 /*
  * Destination is unaligned
@@ -112,7 +112,7 @@
 ENTRY(__memcpy)
 WEAK(memcpy)
 
-	entry	sp, 16		# minimal stack frame
+	abi_entry_default
 	# a2/ dst, a3/ src, a4/ len
 	mov	a5, a2		# copy dst so that a2 is return value
 .Lcommon:
@@ -161,7 +161,7 @@ WEAK(memcpy)
 	bbsi.l	a4, 2, .L3
 	bbsi.l	a4, 1, .L4
 	bbsi.l	a4, 0, .L5
-	retw
+	abi_ret_default
 .L3:
 	# copy 4 bytes
 	l32i	a6, a3,  0
@@ -170,7 +170,7 @@ WEAK(memcpy)
 	addi	a5, a5,  4
 	bbsi.l	a4, 1, .L4
 	bbsi.l	a4, 0, .L5
-	retw
+	abi_ret_default
 .L4:
 	# copy 2 bytes
 	l16ui	a6, a3,  0
@@ -178,12 +178,12 @@ WEAK(memcpy)
 	s16i	a6, a5,  0
 	addi	a5, a5,  2
 	bbsi.l	a4, 0, .L5
-	retw
+	abi_ret_default
 .L5:
 	# copy 1 byte
 	l8ui	a6, a3,  0
 	s8i	a6, a5,  0
-	retw
+	abi_ret_default
 
 /*
  * Destination is aligned, Source is unaligned
@@ -255,7 +255,7 @@ WEAK(memcpy)
 #endif
 	bbsi.l	a4, 1, .L14
 	bbsi.l	a4, 0, .L15
-.Ldone:	retw
+.Ldone:	abi_ret_default
 .L14:
 	# copy 2 bytes
 	l8ui	a6, a3,  0
@@ -265,12 +265,12 @@ WEAK(memcpy)
 	s8i	a7, a5,  1
 	addi	a5, a5,  2
 	bbsi.l	a4, 0, .L15
-	retw
+	abi_ret_default
 .L15:
 	# copy 1 byte
 	l8ui	a6, a3,  0
 	s8i	a6, a5,  0
-	retw
+	abi_ret_default
 
 ENDPROC(__memcpy)
 
@@ -280,7 +280,7 @@ ENDPROC(__memcpy)
 
 ENTRY(bcopy)
 
-	entry	sp, 16		# minimal stack frame
+	abi_entry_default
 	# a2=src, a3=dst, a4=len
 	mov	a5, a3
 	mov	a3, a2
@@ -346,7 +346,7 @@ ENDPROC(bcopy)
 				       # $a3:src != $a7:src_start
 #endif /* !XCHAL_HAVE_LOOPS */
 .Lbackbytecopydone:
-	retw
+	abi_ret_default
 
 /*
  * Destination is unaligned
@@ -380,7 +380,7 @@ ENDPROC(bcopy)
 ENTRY(__memmove)
 WEAK(memmove)
 
-	entry	sp, 16		# minimal stack frame
+	abi_entry_default
 	# a2/ dst, a3/ src, a4/ len
 	mov	a5, a2		# copy dst so that a2 is return value
 .Lmovecommon:
@@ -435,7 +435,7 @@ WEAK(memmove)
 	bbsi.l	a4, 2, .Lback3
 	bbsi.l	a4, 1, .Lback4
 	bbsi.l	a4, 0, .Lback5
-	retw
+	abi_ret_default
 .Lback3:
 	# copy 4 bytes
 	addi	a3, a3, -4
@@ -444,7 +444,7 @@ WEAK(memmove)
 	s32i	a6, a5,  0
 	bbsi.l	a4, 1, .Lback4
 	bbsi.l	a4, 0, .Lback5
-	retw
+	abi_ret_default
 .Lback4:
 	# copy 2 bytes
 	addi	a3, a3, -2
@@ -452,14 +452,14 @@ WEAK(memmove)
 	addi	a5, a5, -2
 	s16i	a6, a5,  0
 	bbsi.l	a4, 0, .Lback5
-	retw
+	abi_ret_default
 .Lback5:
 	# copy 1 byte
 	addi	a3, a3, -1
 	l8ui	a6, a3,  0
 	addi	a5, a5, -1
 	s8i	a6, a5,  0
-	retw
+	abi_ret_default
 
 /*
  * Destination is aligned, Source is unaligned
@@ -531,7 +531,7 @@ WEAK(memmove)
 	bbsi.l	a4, 1, .Lback14
 	bbsi.l	a4, 0, .Lback15
 .Lbackdone:
-	retw
+	abi_ret_default
 .Lback14:
 	# copy 2 bytes
 	addi	a3, a3, -2
@@ -541,13 +541,13 @@ WEAK(memmove)
 	s8i	a6, a5,  0
 	s8i	a7, a5,  1
 	bbsi.l	a4, 0, .Lback15
-	retw
+	abi_ret_default
 .Lback15:
 	# copy 1 byte
 	addi	a3, a3, -1
 	addi	a5, a5, -1
 	l8ui	a6, a3,  0
 	s8i	a6, a5,  0
-	retw
+	abi_ret_default
 
 ENDPROC(__memmove)
diff --git a/arch/xtensa/lib/memset.S b/arch/xtensa/lib/memset.S
index 8632eacbdc80..59b1524fd601 100644
--- a/arch/xtensa/lib/memset.S
+++ b/arch/xtensa/lib/memset.S
@@ -34,7 +34,7 @@
 ENTRY(__memset)
 WEAK(memset)
 
-	entry	sp, 16		# minimal stack frame
+	abi_entry_default
 	# a2/ dst, a3/ c, a4/ length
 	extui	a3, a3, 0, 8	# mask to just 8 bits
 	slli	a7, a3, 8	# duplicate character in all bytes of word
@@ -48,7 +48,7 @@ WEAK(memset)
 	srli	a7, a4, 4	# number of loop iterations with 16B
 				# per iteration
 	bnez	a4, .Laligned
-	retw
+	abi_ret_default
 
 /*
  * Destination is word-aligned.
@@ -95,7 +95,7 @@ EX(10f) s16i	a3, a5,  0
 EX(10f) s8i	a3, a5,  0
 .L5:
 .Lret1:
-	retw
+	abi_ret_default
 
 /*
  * Destination is unaligned
@@ -139,7 +139,7 @@ EX(10f) s8i	a3, a5, 0
 	blt	a5, a6, .Lbyteloop
 #endif /* !XCHAL_HAVE_LOOPS */
 .Lbytesetdone:
-	retw
+	abi_ret_default
 
 ENDPROC(__memset)
 
@@ -150,4 +150,4 @@ ENDPROC(__memset)
 
 10:
 	movi	a2, 0
-	retw
+	abi_ret_default
diff --git a/arch/xtensa/lib/strncpy_user.S b/arch/xtensa/lib/strncpy_user.S
index c4c6c8578d59..4faf46fe3f38 100644
--- a/arch/xtensa/lib/strncpy_user.S
+++ b/arch/xtensa/lib/strncpy_user.S
@@ -50,7 +50,7 @@
 .text
 ENTRY(__strncpy_user)
 
-	entry	sp, 16		# minimal stack frame
+	abi_entry_default
 	# a2/ dst, a3/ src, a4/ len
 	mov	a11, a2		# leave dst in return value register
 	beqz	a4, .Lret	# if len is zero
@@ -93,7 +93,7 @@ EX(10f)	s8i	a9, a11, 0		# store byte 0
 	bnez	a4, .Lsrcaligned	# if len is nonzero
 .Lret:
 	sub	a2, a11, a2		# compute strlen
-	retw
+	abi_ret_default
 
 /*
  * dst is word-aligned, src is word-aligned
@@ -148,14 +148,14 @@ EX(10f)	s8i	a9, a11, 0
 .Lz3:	# byte 3 is zero
 	addi	a11, a11, 3		# advance dst pointer
 	sub	a2, a11, a2		# compute strlen
-	retw
+	abi_ret_default
 .Lz0:	# byte 0 is zero
 #ifdef __XTENSA_EB__
 	movi	a9, 0
 #endif /* __XTENSA_EB__ */
 EX(10f)	s8i	a9, a11, 0
 	sub	a2, a11, a2		# compute strlen
-	retw
+	abi_ret_default
 .Lz1:	# byte 1 is zero
 #ifdef __XTENSA_EB__
 	extui   a9, a9, 16, 16
@@ -163,7 +163,7 @@ EX(10f)	s8i	a9, a11, 0
 EX(10f)	s16i	a9, a11, 0
 	addi	a11, a11, 1		# advance dst pointer
 	sub	a2, a11, a2		# compute strlen
-	retw
+	abi_ret_default
 .Lz2:	# byte 2 is zero
 #ifdef __XTENSA_EB__
 	extui   a9, a9, 16, 16
@@ -173,7 +173,7 @@ EX(10f)	s16i	a9, a11, 0
 EX(10f)	s8i	a9, a11, 2
 	addi	a11, a11, 2		# advance dst pointer
 	sub	a2, a11, a2		# compute strlen
-	retw
+	abi_ret_default
 
 	.align	4		# 1 mod 4 alignment for LOOPNEZ
 	.byte	0		# (0 mod 4 alignment for LBEG)
@@ -199,7 +199,7 @@ EX(10f)	s8i	a9, a11, 0
 
 .Lunalignedend:
 	sub	a2, a11, a2		# compute strlen
-	retw
+	abi_ret_default
 
 ENDPROC(__strncpy_user)
 
@@ -214,4 +214,4 @@ ENDPROC(__strncpy_user)
 10:
 11:
 	movi	a2, -EFAULT
-	retw
+	abi_ret_default
diff --git a/arch/xtensa/lib/strnlen_user.S b/arch/xtensa/lib/strnlen_user.S
index 1f2ca2bb2ab3..3d391dca3efb 100644
--- a/arch/xtensa/lib/strnlen_user.S
+++ b/arch/xtensa/lib/strnlen_user.S
@@ -45,7 +45,7 @@
 .text
 ENTRY(__strnlen_user)
 
-	entry	sp, 16		# minimal stack frame
+	abi_entry_default
 	# a2/ s, a3/ len
 	addi	a4, a2, -4	# because we overincrement at the end;
 				# we compensate with load offsets of 4
@@ -96,7 +96,7 @@ EX(10f)	l32i	a9, a4, 4	# load 4 bytes for remaining checks
 	addi	a4, a4, 1	# advance string pointer
 .L101:
 	sub	a2, a4, a2	# compute length
-	retw
+	abi_ret_default
 
 # NOTE that in several places below, we point to the byte just after
 # the zero byte in order to include the NULL terminator in the count.
@@ -106,15 +106,15 @@ EX(10f)	l32i	a9, a4, 4	# load 4 bytes for remaining checks
 .Lz0:	# byte 0 is zero
 	addi	a4, a4, 1	# point just beyond zero byte
 	sub	a2, a4, a2	# subtract to get length
-	retw
+	abi_ret_default
 .Lz1:	# byte 1 is zero
 	addi	a4, a4, 1+1	# point just beyond zero byte
 	sub	a2, a4, a2	# subtract to get length
-	retw
+	abi_ret_default
 .Lz2:	# byte 2 is zero
 	addi	a4, a4, 2+1	# point just beyond zero byte
 	sub	a2, a4, a2	# subtract to get length
-	retw
+	abi_ret_default
 
 .L1mod2:	# address is odd
 EX(10f)	l8ui	a9, a4, 4		# get byte 0
@@ -130,7 +130,7 @@ EX(10f)	l32i	a9, a4, 0	# get word with first two bytes of string
 	# byte 3 is zero
 	addi	a4, a4, 3+1	# point just beyond zero byte
 	sub	a2, a4, a2	# subtract to get length
-	retw
+	abi_ret_default
 
 ENDPROC(__strnlen_user)
 
@@ -138,4 +138,4 @@ ENDPROC(__strnlen_user)
 	.align	4
 10:
 	movi	a2, 0
-	retw
+	abi_ret_default
diff --git a/arch/xtensa/lib/usercopy.S b/arch/xtensa/lib/usercopy.S
index 228607e30bc2..a0aa4047f94a 100644
--- a/arch/xtensa/lib/usercopy.S
+++ b/arch/xtensa/lib/usercopy.S
@@ -60,7 +60,7 @@
 	.text
 ENTRY(__xtensa_copy_user)
 
-	entry	sp, 16		# minimal stack frame
+	abi_entry_default
 	# a2/ dst, a3/ src, a4/ len
 	mov	a5, a2		# copy dst so that a2 is return value
 	mov	a11, a4		# preserve original len for error case
@@ -75,7 +75,7 @@ ENTRY(__xtensa_copy_user)
 	__ssa8	a3		# set shift amount from byte offset
 	bnez	a4, .Lsrcunaligned
 	movi	a2, 0		# return success for len==0
-	retw
+	abi_ret_default
 
 /*
  * Destination is unaligned
@@ -127,7 +127,7 @@ EX(10f)	s8i	a6, a5, 0
 #endif /* !XCHAL_HAVE_LOOPS */
 .Lbytecopydone:
 	movi	a2, 0		# return success for len bytes copied
-	retw
+	abi_ret_default
 
 /*
  * Destination and source are word-aligned.
@@ -187,7 +187,7 @@ EX(10f)	l8ui	a6, a3,  0
 EX(10f)	s8i	a6, a5,  0
 .L5:
 	movi	a2, 0		# return success for len bytes copied
-	retw
+	abi_ret_default
 
 /*
  * Destination is aligned, Source is unaligned
@@ -264,7 +264,7 @@ EX(10f)	l8ui	a6, a3,  0
 EX(10f)	s8i	a6, a5,  0
 .L15:
 	movi	a2, 0		# return success for len bytes copied
-	retw
+	abi_ret_default
 
 ENDPROC(__xtensa_copy_user)
 
@@ -281,4 +281,4 @@ ENDPROC(__xtensa_copy_user)
 10:
 	sub	a2, a5, a2	/* a2 <-- bytes copied */
 	sub	a2, a11, a2	/* a2 <-- bytes not copied */
-	retw
+	abi_ret_default
diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index b51746f2b80b..79467c749416 100644
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -45,10 +45,7 @@ void __init bootmem_init(void)
 	 * If PHYS_OFFSET is zero reserve page at address 0:
 	 * successfull allocations should never return NULL.
 	 */
-	if (PHYS_OFFSET)
-		memblock_reserve(0, PHYS_OFFSET);
-	else
-		memblock_reserve(0, 1);
+	memblock_reserve(0, PHYS_OFFSET ? PHYS_OFFSET : 1);
 
 	early_init_fdt_scan_reserved_mem();
 
diff --git a/arch/xtensa/mm/misc.S b/arch/xtensa/mm/misc.S
index 11a01c3e9cea..6aa036c427c3 100644
--- a/arch/xtensa/mm/misc.S
+++ b/arch/xtensa/mm/misc.S
@@ -30,7 +30,7 @@
 
 ENTRY(clear_page)
 
-	entry	a1, 16
+	abi_entry_default
 
 	movi	a3, 0
 	__loopi	a2, a7, PAGE_SIZE, 32
@@ -44,7 +44,7 @@ ENTRY(clear_page)
 	s32i	a3, a2, 28
 	__endla	a2, a7, 32
 
-	retw
+	abi_ret_default
 
 ENDPROC(clear_page)
 
@@ -57,7 +57,7 @@ ENDPROC(clear_page)
 
 ENTRY(copy_page)
 
-	entry	a1, 16
+	abi_entry_default
 
 	__loopi a2, a4, PAGE_SIZE, 32
 
@@ -86,7 +86,7 @@ ENTRY(copy_page)
 
 	__endl  a2, a4
 
-	retw
+	abi_ret_default
 
 ENDPROC(copy_page)
 
@@ -116,7 +116,7 @@ ENTRY(__tlbtemp_mapping_start)
 
 ENTRY(clear_page_alias)
 
-	entry	a1, 32
+	abi_entry_default
 
 	/* Skip setting up a temporary DTLB if not aliased low page. */
 
@@ -144,14 +144,14 @@ ENTRY(clear_page_alias)
 	__endla	a2, a7, 32
 
 	bnez	a6, 1f
-	retw
+	abi_ret_default
 
 	/* We need to invalidate the temporary idtlb entry, if any. */
 
 1:	idtlb	a4
 	dsync
 
-	retw
+	abi_ret_default
 
 ENDPROC(clear_page_alias)
 
@@ -164,7 +164,7 @@ ENDPROC(clear_page_alias)
 
 ENTRY(copy_page_alias)
 
-	entry	a1, 32
+	abi_entry_default
 
 	/* Skip setting up a temporary DTLB for destination if not aliased. */
 
@@ -221,19 +221,19 @@ ENTRY(copy_page_alias)
 
 	bnez	a6, 1f
 	bnez	a7, 2f
-	retw
+	abi_ret_default
 
 1:	addi	a2, a2, -PAGE_SIZE
 	idtlb	a2
 	dsync
 	bnez	a7, 2f
-	retw
+	abi_ret_default
 
 2:	addi	a3, a3, -PAGE_SIZE+1
 	idtlb	a3
 	dsync
 
-	retw
+	abi_ret_default
 
 ENDPROC(copy_page_alias)
 
@@ -248,7 +248,7 @@ ENDPROC(copy_page_alias)
 
 ENTRY(__flush_invalidate_dcache_page_alias)
 
-	entry	sp, 16
+	abi_entry_default
 
 	movi	a7, 0			# required for exception handler
 	addi	a6, a3, (PAGE_KERNEL | _PAGE_HW_WRITE)
@@ -261,7 +261,7 @@ ENTRY(__flush_invalidate_dcache_page_alias)
 	idtlb	a4
 	dsync
 
-	retw
+	abi_ret_default
 
 ENDPROC(__flush_invalidate_dcache_page_alias)
 
@@ -272,7 +272,7 @@ ENDPROC(__flush_invalidate_dcache_page_alias)
 
 ENTRY(__invalidate_dcache_page_alias)
 
-	entry	sp, 16
+	abi_entry_default
 
 	movi	a7, 0			# required for exception handler
 	addi	a6, a3, (PAGE_KERNEL | _PAGE_HW_WRITE)
@@ -285,7 +285,7 @@ ENTRY(__invalidate_dcache_page_alias)
 	idtlb	a4
 	dsync
 
-	retw
+	abi_ret_default
 
 ENDPROC(__invalidate_dcache_page_alias)
 #endif
@@ -296,7 +296,7 @@ ENTRY(__tlbtemp_mapping_itlb)
 	
 ENTRY(__invalidate_icache_page_alias)
 
-	entry	sp, 16
+	abi_entry_default
 
 	addi	a6, a3, (PAGE_KERNEL_EXEC | _PAGE_HW_WRITE)
 	mov	a4, a2
@@ -307,7 +307,7 @@ ENTRY(__invalidate_icache_page_alias)
 
 	iitlb	a4
 	isync
-	retw
+	abi_ret_default
 
 ENDPROC(__invalidate_icache_page_alias)
 
@@ -325,12 +325,12 @@ ENTRY(__tlbtemp_mapping_end)
 
 ENTRY(__invalidate_icache_page)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___invalidate_icache_page a2 a3
 	isync
 
-	retw
+	abi_ret_default
 
 ENDPROC(__invalidate_icache_page)
 
@@ -340,12 +340,12 @@ ENDPROC(__invalidate_icache_page)
 
 ENTRY(__invalidate_dcache_page)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___invalidate_dcache_page a2 a3
 	dsync
 
-	retw
+	abi_ret_default
 
 ENDPROC(__invalidate_dcache_page)
 
@@ -355,12 +355,12 @@ ENDPROC(__invalidate_dcache_page)
 
 ENTRY(__flush_invalidate_dcache_page)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___flush_invalidate_dcache_page a2 a3
 
 	dsync
-	retw
+	abi_ret_default
 
 ENDPROC(__flush_invalidate_dcache_page)
 
@@ -370,12 +370,12 @@ ENDPROC(__flush_invalidate_dcache_page)
 
 ENTRY(__flush_dcache_page)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___flush_dcache_page a2 a3
 
 	dsync
-	retw
+	abi_ret_default
 
 ENDPROC(__flush_dcache_page)
 
@@ -385,12 +385,12 @@ ENDPROC(__flush_dcache_page)
 
 ENTRY(__invalidate_icache_range)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___invalidate_icache_range a2 a3 a4
 	isync
 
-	retw
+	abi_ret_default
 
 ENDPROC(__invalidate_icache_range)
 
@@ -400,12 +400,12 @@ ENDPROC(__invalidate_icache_range)
 
 ENTRY(__flush_invalidate_dcache_range)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___flush_invalidate_dcache_range a2 a3 a4
 	dsync
 
-	retw
+	abi_ret_default
 
 ENDPROC(__flush_invalidate_dcache_range)
 
@@ -415,12 +415,12 @@ ENDPROC(__flush_invalidate_dcache_range)
 
 ENTRY(__flush_dcache_range)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___flush_dcache_range a2 a3 a4
 	dsync
 
-	retw
+	abi_ret_default
 
 ENDPROC(__flush_dcache_range)
 
@@ -430,11 +430,11 @@ ENDPROC(__flush_dcache_range)
 
 ENTRY(__invalidate_dcache_range)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___invalidate_dcache_range a2 a3 a4
 
-	retw
+	abi_ret_default
 
 ENDPROC(__invalidate_dcache_range)
 
@@ -444,12 +444,12 @@ ENDPROC(__invalidate_dcache_range)
 
 ENTRY(__invalidate_icache_all)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___invalidate_icache_all a2 a3
 	isync
 
-	retw
+	abi_ret_default
 
 ENDPROC(__invalidate_icache_all)
 
@@ -459,12 +459,12 @@ ENDPROC(__invalidate_icache_all)
 
 ENTRY(__flush_invalidate_dcache_all)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___flush_invalidate_dcache_all a2 a3
 	dsync
 
-	retw
+	abi_ret_default
 
 ENDPROC(__flush_invalidate_dcache_all)
 
@@ -474,11 +474,11 @@ ENDPROC(__flush_invalidate_dcache_all)
 
 ENTRY(__invalidate_dcache_all)
 
-	entry	sp, 16
+	abi_entry_default
 
 	___invalidate_dcache_all a2 a3
 	dsync
 
-	retw
+	abi_ret_default
 
 ENDPROC(__invalidate_dcache_all)