2 files changed, 616 insertions, 0 deletions

diff --git a/arch/metag/include/asm/thread_info.h b/arch/metag/include/asm/thread_info.h
new file mode 100644
index 000000000000..0ecd34d8b5f6
--- /dev/null
+++ b/arch/metag/include/asm/thread_info.h
@@ -0,0 +1,155 @@
+/* thread_info.h: Meta low-level thread information
+ *
+ * Copyright (C) 2002  David Howells (dhowells@redhat.com)
+ * - Incorporating suggestions made by Linus Torvalds and Dave Miller
+ *
+ * Meta port by Imagination Technologies
+ */
+
+#ifndef _ASM_THREAD_INFO_H
+#define _ASM_THREAD_INFO_H
+
+#include <linux/compiler.h>
+#include <asm/page.h>
+
+#ifndef __ASSEMBLY__
+#include <asm/processor.h>
+#endif
+
+/*
+ * low level task data that entry.S needs immediate access to
+ * - this struct should fit entirely inside of one cache line
+ * - this struct shares the supervisor stack pages
+ * - if the contents of this structure are changed, the assembly constants must
+ *   also be changed
+ */
+#ifndef __ASSEMBLY__
+
+/* This must be 8 byte aligned so we can ensure stack alignment. */
+struct thread_info {
+        struct task_struct *task;       /* main task structure */
+        struct exec_domain *exec_domain;        /* execution domain */
+        unsigned long flags;    /* low level flags */
+        unsigned long status;   /* thread-synchronous flags */
+        u32 cpu;                /* current CPU */
+        int preempt_count;      /* 0 => preemptable, <0 => BUG */
+
+        mm_segment_t addr_limit;        /* thread address space */
+        struct restart_block restart_block;
+
+        u8 supervisor_stack[0];
+};
+
+#else /* !__ASSEMBLY__ */
+
+#include <generated/asm-offsets.h>
+
+#endif
+
+#define PREEMPT_ACTIVE          0x10000000
+
+#ifdef CONFIG_4KSTACKS
+#define THREAD_SHIFT            12
+#else
+#define THREAD_SHIFT            13
+#endif
+
+#if THREAD_SHIFT >= PAGE_SHIFT
+#define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
+#else
+#define THREAD_SIZE_ORDER       0
+#endif
+
+#define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
+
+#define STACK_WARN              (THREAD_SIZE/8)
+/*
+ * macros/functions for gaining access to the thread information structure
+ */
+#ifndef __ASSEMBLY__
+
+#define INIT_THREAD_INFO(tsk)                   \
+{                                               \
+        .task           = &tsk,                 \
+        .exec_domain    = &default_exec_domain, \
+        .flags          = 0,                    \
+        .cpu            = 0,                    \
+        .preempt_count  = INIT_PREEMPT_COUNT,   \
+        .addr_limit     = KERNEL_DS,            \
+        .restart_block = {                      \
+                .fn = do_no_restart_syscall,    \
+        },                                      \
+}
+
+#define init_thread_info        (init_thread_union.thread_info)
+#define init_stack              (init_thread_union.stack)
+
+/* how to get the current stack pointer from C */
+register unsigned long current_stack_pointer asm("A0StP") __used;
+
+/* how to get the thread information struct from C */
+static inline struct thread_info *current_thread_info(void)
+{
+        return (struct thread_info *)(current_stack_pointer &
+                                      ~(THREAD_SIZE - 1));
+}
+
+#define __HAVE_ARCH_KSTACK_END
+static inline int kstack_end(void *addr)
+{
+        return addr == (void *) (((unsigned long) addr & ~(THREAD_SIZE - 1))
+                                 + sizeof(struct thread_info));
+}
+
+#endif
+
+/*
+ * thread information flags
+ * - these are process state flags that various assembly files may need to
+ *   access
+ * - pending work-to-be-done flags are in LSW
+ * - other flags in MSW
+ */
+#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
+#define TIF_SIGPENDING          1       /* signal pending */
+#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
+#define TIF_SINGLESTEP          3       /* restore singlestep on return to user
+                                           mode */
+#define TIF_SYSCALL_AUDIT       4       /* syscall auditing active */
+#define TIF_SECCOMP             5       /* secure computing */
+#define TIF_RESTORE_SIGMASK     6       /* restore signal mask in do_signal() */
+#define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
+#define TIF_POLLING_NRFLAG      8       /* true if poll_idle() is polling
+                                           TIF_NEED_RESCHED */
+#define TIF_MEMDIE              9       /* is terminating due to OOM killer */
+#define TIF_SYSCALL_TRACEPOINT  10      /* syscall tracepoint instrumentation */
+
+
+#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
+#define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
+#define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
+#define _TIF_SECCOMP            (1<<TIF_SECCOMP)
+#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
+#define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
+#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
+
+/* work to do in syscall trace */
+#define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
+                                 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
+                                 _TIF_SYSCALL_TRACEPOINT)
+
+/* work to do on any return to u-space */
+#define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
+                                 _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
+                                 _TIF_SINGLESTEP    | _TIF_RESTORE_SIGMASK | \
+                                 _TIF_NOTIFY_RESUME)
+
+/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
+                                 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
+
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+
+#endif /* _ASM_THREAD_INFO_H */
diff --git a/arch/metag/kernel/process.c b/arch/metag/kernel/process.c
new file mode 100644
index 000000000000..c6efe62e5b76
--- /dev/null
+++ b/arch/metag/kernel/process.c
@@ -0,0 +1,461 @@
+/*
+ * Copyright (C) 2005,2006,2007,2008,2009,2010,2011 Imagination Technologies
+ *
+ * This file contains the architecture-dependent parts of process handling.
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/reboot.h>
+#include <linux/elfcore.h>
+#include <linux/fs.h>
+#include <linux/tick.h>
+#include <linux/slab.h>
+#include <linux/mman.h>
+#include <linux/pm.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+#include <asm/core_reg.h>
+#include <asm/user_gateway.h>
+#include <asm/tcm.h>
+#include <asm/traps.h>
+#include <asm/switch_to.h>
+
+/*
+ * Wait for the next interrupt and enable local interrupts
+ */
+static inline void arch_idle(void)
+{
+        int tmp;
+
+        /*
+         * Quickly jump straight into the interrupt entry point without actually