Merge tag 'xtensa-next-20130225' of git://github.com/czankel/xtensa-l…

…inux

Pull xtensa update from Chris Zankel:
 "Added features:
   - add support for thread local storage (TLS)

   - add accept4 and finit_module syscalls

   - support medium-priority interrupts

   - add support for dc232c processor variant

   - support file-base simulated disk for ISS simulator

  Bug fixes:

   - fix return values returned by the str[n]cmp functions

   - avoid mmap cache aliasing

   - fix handling of 'windowed registers' in ptrace"

* tag 'xtensa-next-20130225' of git://github.com/czankel/xtensa-linux:
  xtensa: add accept4 syscall
  xtensa: add support for TLS
  xtensa: add missing include asm/uaccess.h to checksum.h
  xtensa: do not enable GENERIC_GPIO by default
  xtensa: complete ptrace handling of register windows
  xtensa: add support for oprofile
  xtensa: move spill_registers to traps.h
  xtensa: ISS: add host file-based simulated disk
  xtensa: fix str[n]cmp return value
  xtensa: avoid mmap cache aliasing
  xtensa: add finit_module syscall
  xtensa: pull signal definitions from signal-defs.h
  xtensa: fix ipc_parse_version selection
  xtensa: dispatch medium-priority interrupts
  xtensa: Add config files for Diamond 233L - Rev C processor variant
  xtensa: use new common dtc rule
  xtensa: rename prom_update_property to of_update_property

arch/xtensa/Kconfig

@@ -13,9 +13,11 @@ config XTENSA
 	select GENERIC_CPU_DEVICES
 	select MODULES_USE_ELF_RELA
 	select GENERIC_PCI_IOMAP
+	select ARCH_WANT_IPC_PARSE_VERSION
 	select ARCH_WANT_OPTIONAL_GPIOLIB
 	select CLONE_BACKWARDS
 	select IRQ_DOMAIN
+	select HAVE_OPROFILE
 	help
 	  Xtensa processors are 32-bit RISC machines designed by Tensilica
 	  primarily for embedded systems.  These processors are both
@@ -31,7 +33,7 @@ config GENERIC_HWEIGHT
 	def_bool y
 
 config GENERIC_GPIO
-	def_bool y
+	bool
 
 config ARCH_HAS_ILOG2_U32
 	def_bool n
@@ -71,6 +73,12 @@ config XTENSA_VARIANT_DC232B
 	help
 	  This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
 
+config XTENSA_VARIANT_DC233C
+	bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
+	select MMU
+	help
+	  This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
+
 config XTENSA_VARIANT_S6000
 	bool "s6000 - Stretch software configurable processor"
 	select VARIANT_IRQ_SWITCH
@@ -197,6 +205,42 @@ config BUILTIN_DTB
 	string "DTB to build into the kernel image"
 	depends on OF
 
+config BLK_DEV_SIMDISK
+	tristate "Host file-based simulated block device support"
+	default n
+	depends on XTENSA_PLATFORM_ISS
+	help
+	  Create block devices that map to files in the host file system.
+	  Device binding to host file may be changed at runtime via proc
+	  interface provided the device is not in use.
+
+config BLK_DEV_SIMDISK_COUNT
+	int "Number of host file-based simulated block devices"
+	range 1 10
+	depends on BLK_DEV_SIMDISK
+	default 2
+	help
+	  This is the default minimal number of created block devices.
+	  Kernel/module parameter 'simdisk_count' may be used to change this
+	  value at runtime. More file names (but no more than 10) may be
+	  specified as parameters, simdisk_count grows accordingly.
+
+config SIMDISK0_FILENAME
+	string "Host filename for the first simulated device"
+	depends on BLK_DEV_SIMDISK = y
+	default ""
+	help
+	  Attach a first simdisk to a host file. Conventionally, this file
+	  contains a root file system.
+
+config SIMDISK1_FILENAME
+	string "Host filename for the second simulated device"
+	depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
+	default ""
+	help
+	  Another simulated disk in a host file for a buildroot-independent
+	  storage.
+
 source "mm/Kconfig"
 
 source "drivers/pcmcia/Kconfig"

arch/xtensa/Makefile

@@ -15,6 +15,7 @@
 
 variant-$(CONFIG_XTENSA_VARIANT_FSF)		:= fsf
 variant-$(CONFIG_XTENSA_VARIANT_DC232B)		:= dc232b
+variant-$(CONFIG_XTENSA_VARIANT_DC233C)		:= dc233c
 variant-$(CONFIG_XTENSA_VARIANT_S6000)		:= s6000
 variant-$(CONFIG_XTENSA_VARIANT_LINUX_CUSTOM)	:= custom
 
@@ -86,9 +87,10 @@ core-y		+= arch/xtensa/kernel/ arch/xtensa/mm/
 core-y		+= $(buildvar) $(buildplf)
 
 libs-y		+= arch/xtensa/lib/ $(LIBGCC)
+drivers-$(CONFIG_OPROFILE)	+= arch/xtensa/oprofile/
 
 ifneq ($(CONFIG_BUILTIN_DTB),"")
-core-$(CONFIG_OF) += arch/xtensa/boot/
+core-$(CONFIG_OF) += arch/xtensa/boot/dts/
 endif
 
 boot		:= arch/xtensa/boot
@@ -101,7 +103,7 @@ zImage: vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $@
 
 %.dtb:
-	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
+	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 
 define archhelp
   @echo '* zImage      - Compressed kernel image (arch/xtensa/boot/images/zImage.*)'

arch/xtensa/boot/Makefile

@@ -25,18 +25,6 @@ bootdir-$(CONFIG_XTENSA_PLATFORM_ISS)	 += boot-elf
 bootdir-$(CONFIG_XTENSA_PLATFORM_XT2000) += boot-redboot boot-elf boot-uboot
 bootdir-$(CONFIG_XTENSA_PLATFORM_XTFPGA) += boot-redboot boot-elf boot-uboot
 
-
-BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB)).dtb.o
-ifneq ($(CONFIG_BUILTIN_DTB),"")
-obj-$(CONFIG_OF) += $(BUILTIN_DTB)
-endif
-
-# Rule to build device tree blobs
-$(obj)/%.dtb: $(src)/dts/%.dts FORCE
-	$(call if_changed_dep,dtc)
-
-clean-files := *.dtb.S
-
 zImage Image: $(bootdir-y)
 
 $(bootdir-y): $(addprefix $(obj)/,$(subdir-y)) \

arch/xtensa/boot/dts/Makefile

@@ -0,0 +1,15 @@
+#
+# arch/xtensa/boot/dts/Makefile
+#
+# 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.
+#
+#
+
+BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_BUILTIN_DTB)).dtb.o
+ifneq ($(CONFIG_BUILTIN_DTB),"")
+obj-$(CONFIG_OF) += $(BUILTIN_DTB)
+endif
+
+clean-files := *.dtb.S

arch/xtensa/include/asm/atomic.h

@@ -7,7 +7,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2001 - 2008 Tensilica Inc.
  */
 
 #ifndef _XTENSA_ATOMIC_H
@@ -24,11 +24,11 @@
 
 /*
  * This Xtensa implementation assumes that the right mechanism
- * for exclusion is for locking interrupts to level 1.
+ * for exclusion is for locking interrupts to level EXCM_LEVEL.
  *
  * Locking interrupts looks like this:
  *
- *    rsil a15, 1
+ *    rsil a15, LOCKLEVEL
  *    <code>
  *    wsr  a15, PS
  *    rsync

arch/xtensa/include/asm/checksum.h

@@ -12,6 +12,7 @@
 #define _XTENSA_CHECKSUM_H
 
 #include <linux/in6.h>
+#include <asm/uaccess.h>
 #include <variant/core.h>
 
 /*

arch/xtensa/include/asm/elf.h

@@ -84,7 +84,8 @@ typedef struct {
 	elf_greg_t sar;
 	elf_greg_t windowstart;
 	elf_greg_t windowbase;
-	elf_greg_t reserved[8+48];
+	elf_greg_t threadptr;
+	elf_greg_t reserved[7+48];
 	elf_greg_t a[64];
 } xtensa_gregset_t;
 

arch/xtensa/include/asm/pgtable.h

@@ -410,6 +410,10 @@ typedef pte_t *pte_addr_t;
 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 #define __HAVE_ARCH_PTEP_MKDIRTY
 #define __HAVE_ARCH_PTE_SAME
+/* We provide our own get_unmapped_area to cope with
+ * SHM area cache aliasing for userland.
+ */
+#define HAVE_ARCH_UNMAPPED_AREA
 
 #include <asm-generic/pgtable.h>
 

arch/xtensa/include/asm/processor.h

@@ -5,7 +5,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2001 - 2008 Tensilica Inc.
  */
 
 #ifndef _XTENSA_PROCESSOR_H
@@ -68,7 +68,7 @@
 /* LOCKLEVEL defines the interrupt level that masks all
  * general-purpose interrupts.
  */
-#define LOCKLEVEL 1
+#define LOCKLEVEL XCHAL_EXCM_LEVEL
 
 /* WSBITS and WBBITS are the width of the WINDOWSTART and WINDOWBASE
  * registers

arch/xtensa/include/asm/ptrace.h

@@ -38,6 +38,7 @@ struct pt_regs {
 	unsigned long syscall;		/*  56 */
 	unsigned long icountlevel;	/*  60 */
 	unsigned long scompare1;	/*  64 */
+	unsigned long threadptr;	/*  68 */
 
 	/* Additional configurable registers that are used by the compiler. */
 	xtregs_opt_t xtregs_opt;
@@ -48,7 +49,7 @@ struct pt_regs {
 	/* current register frame.
 	 * Note: The ESF for kernel exceptions ends after 16 registers!
 	 */
-	unsigned long areg[16];		/* 128 (64) */
+	unsigned long areg[16];
 };
 
 #include <variant/core.h>

arch/xtensa/include/asm/regs.h

@@ -88,6 +88,7 @@
 #define PS_UM_BIT		5
 #define PS_EXCM_BIT		4
 #define PS_INTLEVEL_SHIFT	0
+#define PS_INTLEVEL_WIDTH	4
 #define PS_INTLEVEL_MASK	0x0000000F
 
 /*  DBREAKCn register fields.  */

arch/xtensa/include/asm/string.h

@@ -74,7 +74,7 @@ static inline int strcmp(const char *__cs, const char *__ct)
 		"beqz	%2, 2f\n\t"
 		"beq	%2, %3, 1b\n"
 		"2:\n\t"
-		"sub	%2, %3, %2"
+		"sub	%2, %2, %3"
 		: "=r" (__cs), "=r" (__ct), "=&r" (__res), "=&r" (__dummy)
 		: "0" (__cs), "1" (__ct));
 
@@ -99,7 +99,7 @@ static inline int strncmp(const char *__cs, const char *__ct, size_t __n)
 		"beqz	%3, 2f\n\t"
 		"beq	%2, %3, 1b\n"
 		"2:\n\t"
-		"sub	%2, %3, %2"
+		"sub	%2, %2, %3"
 		: "=r" (__cs), "=r" (__ct), "=&r" (__res), "=&r" (__dummy)
 		: "0" (__cs), "1" (__ct), "r" (__cs+__n));
 

arch/xtensa/include/asm/timex.h

@@ -5,7 +5,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2001 - 2008 Tensilica Inc.
  */
 
 #ifndef _XTENSA_TIMEX_H
@@ -19,13 +19,13 @@
 #define _INTLEVEL(x)	XCHAL_INT ## x ## _LEVEL
 #define INTLEVEL(x)	_INTLEVEL(x)
 
-#if INTLEVEL(XCHAL_TIMER0_INTERRUPT) == 1
+#if INTLEVEL(XCHAL_TIMER0_INTERRUPT) <= XCHAL_EXCM_LEVEL
 # define LINUX_TIMER     0
 # define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
-#elif INTLEVEL(XCHAL_TIMER1_INTERRUPT) == 1
+#elif INTLEVEL(XCHAL_TIMER1_INTERRUPT) <= XCHAL_EXCM_LEVEL
 # define LINUX_TIMER     1
 # define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
-#elif INTLEVEL(XCHAL_TIMER2_INTERRUPT) == 1
+#elif INTLEVEL(XCHAL_TIMER2_INTERRUPT) <= XCHAL_EXCM_LEVEL
 # define LINUX_TIMER     2
 # define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
 #else

arch/xtensa/include/asm/traps.h

@@ -20,4 +20,28 @@
 extern void * __init trap_set_handler(int cause, void *handler);
 extern void do_unhandled(struct pt_regs *regs, unsigned long exccause);
 
+static inline void spill_registers(void)
+{
+	unsigned int a0, ps;
+
+	__asm__ __volatile__ (
+		"movi	a14, " __stringify(PS_EXCM_BIT | LOCKLEVEL) "\n\t"
+		"mov	a12, a0\n\t"
+		"rsr	a13, sar\n\t"
+		"xsr	a14, ps\n\t"
+		"movi	a0, _spill_registers\n\t"
+		"rsync\n\t"
+		"callx0 a0\n\t"
+		"mov	a0, a12\n\t"
+		"wsr	a13, sar\n\t"
+		"wsr	a14, ps\n\t"
+		: : "a" (&a0), "a" (&ps)
+#if defined(CONFIG_FRAME_POINTER)
+		: "a2", "a3", "a4",       "a11", "a12", "a13", "a14", "a15",
+#else
+		: "a2", "a3", "a4", "a7", "a11", "a12", "a13", "a14", "a15",
+#endif
+		  "memory");
+}
+
 #endif /* _XTENSA_TRAPS_H */

arch/xtensa/include/uapi/asm/signal.h

@@ -102,16 +102,7 @@ typedef struct {
 
 #ifndef __ASSEMBLY__
 
-#define SIG_BLOCK          0	/* for blocking signals */
-#define SIG_UNBLOCK        1	/* for unblocking signals */
-#define SIG_SETMASK        2	/* for setting the signal mask */
-
-/* Type of a signal handler.  */
-typedef void (*__sighandler_t)(int);
-
-#define SIG_DFL	((__sighandler_t)0)	/* default signal handling */
-#define SIG_IGN	((__sighandler_t)1)	/* ignore signal */
-#define SIG_ERR	((__sighandler_t)-1)	/* error return from signal */
+#include <asm-generic/signal-defs.h>
 
 #ifndef __KERNEL__
 

arch/xtensa/include/uapi/asm/unistd.h

@@ -728,8 +728,13 @@ __SYSCALL(330, sys_prlimit64, 4)
 #define __NR_kcmp				331
 __SYSCALL(331, sys_kcmp, 5)
 
+#define __NR_finit_module			332
+__SYSCALL(332, sys_finit_module, 3)
 
-#define __NR_syscall_count			332
+#define __NR_accept4				333
+__SYSCALL(333, sys_accept4, 4)
+
+#define __NR_syscall_count			334
 
 /*
  * sysxtensa syscall handler

arch/xtensa/kernel/asm-offsets.c

@@ -42,6 +42,7 @@ int main(void)
 	DEFINE(PT_ICOUNTLEVEL, offsetof (struct pt_regs, icountlevel));
 	DEFINE(PT_SYSCALL, offsetof (struct pt_regs, syscall));
 	DEFINE(PT_SCOMPARE1, offsetof(struct pt_regs, scompare1));
+	DEFINE(PT_THREADPTR, offsetof(struct pt_regs, threadptr));
 	DEFINE(PT_AREG, offsetof (struct pt_regs, areg[0]));
 	DEFINE(PT_AREG0, offsetof (struct pt_regs, areg[0]));
 	DEFINE(PT_AREG1, offsetof (struct pt_regs, areg[1]));