Merge Qualcom Hexagon architecture

This is the fifth version of the patchset (with one tiny whitespace fix)
to the Linux kernel to support the Qualcomm Hexagon architecture.

Between now and the next pull requests, Richard Kuo should have his key
signed, etc., and should be back on kernel.org.  In the meantime, this
got merged as a emailed patch-series.

* Hexagon: (36 commits)
  Add extra arch overrides to asm-generic/checksum.h
  Hexagon: Add self to MAINTAINERS
  Hexagon: Add basic stacktrace functionality for Hexagon architecture.
  Hexagon: Add configuration and makefiles for the Hexagon architecture.
  Hexagon: Comet platform support
  Hexagon: kgdb support files
  Hexagon: Add page-fault support.
  Hexagon: Add page table header files & etc.
  Hexagon: Add ioremap support
  Hexagon: Provide DMA implementation
  Hexagon: Implement basic TLB management routines for Hexagon.
  Hexagon: Implement basic cache-flush support
  Hexagon: Provide basic implementation and/or stubs for I/O routines.
  Hexagon: Add user access functions
  Hexagon: Add locking types and functions
  Hexagon: Add SMP support
  Hexagon: Provide basic debugging and system trap support.
  Hexagon: Add ptrace support
  Hexagon: Add time and timer functions
  Hexagon: Add interrupts
  ...

1 files changed, 101 insertions, 0 deletions

diff --git a/arch/hexagon/kernel/vm_events.c b/arch/hexagon/kernel/vm_events.c
new file mode 100644
index 0000000..986a081
--- /dev/null
+++ b/arch/hexagon/kernel/vm_events.c
@@ -0,0 +1,101 @@
+/*
+ * Mostly IRQ support for Hexagon
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <asm/registers.h>
+#include <linux/irq.h>
+#include <linux/hardirq.h>
+#include <asm/system.h>
+
+/*
+ * show_regs - print pt_regs structure
+ * @regs: pointer to pt_regs
+ *
+ * To-do:  add all the accessor definitions to registers.h
+ *
+ * Will make this routine a lot easier to write.
+ */
+void show_regs(struct pt_regs *regs)
+{
+	printk(KERN_EMERG "restart_r0: \t0x%08lx   syscall_nr: %ld\n",
+	       regs->restart_r0, regs->syscall_nr);
+	printk(KERN_EMERG "preds: \t\t0x%08lx\n", regs->preds);
+	printk(KERN_EMERG "lc0: \t0x%08lx   sa0: 0x%08lx   m0:  0x%08lx\n",
+	       regs->lc0, regs->sa0, regs->m0);
+	printk(KERN_EMERG "lc1: \t0x%08lx   sa1: 0x%08lx   m1:  0x%08lx\n",
+	       regs->lc1, regs->sa1, regs->m1);
+	printk(KERN_EMERG "gp: \t0x%08lx   ugp: 0x%08lx   usr: 0x%08lx\n",
+	       regs->gp, regs->ugp, regs->usr);
+	printk(KERN_EMERG "r0: \t0x%08lx %08lx %08lx %08lx\n", regs->r00,
+		regs->r01,
+		regs->r02,
+		regs->r03);
+	printk(KERN_EMERG "r4:  \t0x%08lx %08lx %08lx %08lx\n", regs->r04,
+		regs->r05,
+		regs->r06,
+		regs->r07);
+	printk(KERN_EMERG "r8:  \t0x%08lx %08lx %08lx %08lx\n", regs->r08,
+		regs->r09,
+		regs->r10,
+		regs->r11);
+	printk(KERN_EMERG "r12: \t0x%08lx %08lx %08lx %08lx\n", regs->r12,
+		regs->r13,
+		regs->r14,
+		regs->r15);
+	printk(KERN_EMERG "r16: \t0x%08lx %08lx %08lx %08lx\n", regs->r16,
+		regs->r17,
+		regs->r18,
+		regs->r19);
+	printk(KERN_EMERG "r20: \t0x%08lx %08lx %08lx %08lx\n", regs->r20,
+		regs->r21,
+		regs->r22,
+		regs->r23);
+	printk(KERN_EMERG "r24: \t0x%08lx %08lx %08lx %08lx\n", regs->r24,
+		regs->r25,
+		regs->r26,
+		regs->r27);
+	printk(KERN_EMERG "r28: \t0x%08lx %08lx %08lx %08lx\n", regs->r28,
+		regs->r29,
+		regs->r30,
+		regs->r31);
+
+	printk(KERN_EMERG "elr: \t0x%08lx   cause: 0x%08lx   user_mode: %d\n",
+		pt_elr(regs), pt_cause(regs), user_mode(regs));
+	printk(KERN_EMERG "psp: \t0x%08lx   badva: 0x%08lx   int_enabled: %d\n",
+		pt_psp(regs), pt_badva(regs), ints_enabled(regs));
+}
+
+void dummy_handler(struct pt_regs *regs)
+{
+	unsigned int elr = pt_elr(regs);
+	printk(KERN_ERR "Unimplemented handler; ELR=0x%08x\n", elr);
+}
+
+
+void arch_do_IRQ(struct pt_regs *regs)
+{
+	int irq = pt_cause(regs);
+	struct pt_regs *old_regs = set_irq_regs(regs);
+
+	irq_enter();
+	generic_handle_irq(irq);
+	irq_exit();
+	set_irq_regs(old_regs);
+}