1 files changed, 280 insertions, 0 deletions

diff --git a/arch/cris/kernel/process.c b/arch/cris/kernel/process.c
new file mode 100644
index 000000000000..9f7cad7c7849
--- /dev/null
+++ b/arch/cris/kernel/process.c
@@ -0,0 +1,280 @@
+/* $Id: process.c,v 1.17 2004/04/05 13:53:48 starvik Exp $
+ * 
+ *  linux/arch/cris/kernel/process.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ *  Copyright (C) 2000-2002  Axis Communications AB
+ *
+ *  Authors:   Bjorn Wesen (bjornw@axis.com)
+ *
+ *  $Log: process.c,v $
+ *  Revision 1.17  2004/04/05 13:53:48  starvik
+ *  Merge of Linux 2.6.5
+ *
+ *  Revision 1.16  2003/10/27 08:04:33  starvik
+ *  Merge of Linux 2.6.0-test9
+ *
+ *  Revision 1.15  2003/09/11 07:29:52  starvik
+ *  Merge of Linux 2.6.0-test5
+ *
+ *  Revision 1.14  2003/06/10 10:21:12  johana
+ *  Moved thread_saved_pc() from arch/cris/kernel/process.c to
+ *  subarch specific process.c. arch-v32 has an erp, no irp.
+ *
+ *  Revision 1.13  2003/04/09 05:20:47  starvik
+ *  Merge of Linux 2.5.67
+ *
+ *  Revision 1.12  2002/12/11 15:41:11  starvik
+ *  Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/kernel
+ *
+ *  Revision 1.11  2002/12/10 09:00:10  starvik
+ *  Merge of Linux 2.5.51
+ *
+ *  Revision 1.10  2002/11/27 08:42:34  starvik
+ *  Argument to user_regs() is thread_info*
+ *
+ *  Revision 1.9  2002/11/26 09:44:21  starvik
+ *  New threads exits through ret_from_fork (necessary for preemptive scheduling)
+ *
+ *  Revision 1.8  2002/11/19 14:35:24  starvik
+ *  Changes from linux 2.4
+ *  Changed struct initializer syntax to the currently prefered notation
+ *
+ *  Revision 1.7  2002/11/18 07:39:42  starvik
+ *  thread_saved_pc moved here from processor.h
+ *
+ *  Revision 1.6  2002/11/14 06:51:27  starvik
+ *  Made cpu_idle more similar with other archs
+ *  init_task_union -> init_thread_union
+ *  Updated for new interrupt macros
+ *  sys_clone and do_fork have a new argument, user_tid
+ *
+ *  Revision 1.5  2002/11/05 06:45:11  starvik
+ *  Merge of Linux 2.5.45
+ *
+ *  Revision 1.4  2002/02/05 15:37:44  bjornw
+ *  Need init_task.h
+ *
+ *  Revision 1.3  2002/01/21 15:22:49  bjornw
+ *  current->counter is gone
+ *
+ *  Revision 1.22  2001/11/13 09:40:43  orjanf
+ *  Added dump_fpu (needed for core dumps).
+ *
+ *  Revision 1.21  2001/11/12 18:26:21  pkj
+ *  Fixed compiler warnings.
+ *
+ *  Revision 1.20  2001/10/03 08:21:39  jonashg
+ *  cause_of_death does not exist if CONFIG_SVINTO_SIM is defined.
+ *
+ *  Revision 1.19  2001/09/26 11:52:54  bjornw
+ *  INIT_MMAP is gone in 2.4.10
+ *
+ *  Revision 1.18  2001/08/21 21:43:51  hp
+ *  Move last watchdog fix inside #ifdef CONFIG_ETRAX_WATCHDOG
+ *
+ *  Revision 1.17  2001/08/21 13:48:01  jonashg
+ *  Added fix by HP to avoid oops when doing a hard_reset_now.
+ *
+ *  Revision 1.16  2001/06/21 02:00:40  hp
+ *      * entry.S: Include asm/unistd.h.
+ *      (_sys_call_table): Use section .rodata, not .data.
+ *      (_kernel_thread): Move from...
+ *      * process.c: ... here.
+ *      * entryoffsets.c (VAL): Break out from...
+ *      (OF): Use VAL.
+ *      (LCLONE_VM): New asmified value from CLONE_VM.
+ *
+ *  Revision 1.15  2001/06/20 16:31:57  hp
+ *  Add comments to describe empty functions according to review.
+ *
+ *  Revision 1.14  2001/05/29 11:27:59  markusl
+ *  Fixed so that hard_reset_now will do reset even if watchdog wasn't enabled
+ *
+ *  Revision 1.13  2001/03/20 19:44:06  bjornw
+ *  Use the 7th syscall argument for regs instead of current_regs
+ *
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#include <asm/atomic.h>
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/irq.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/fs_struct.h>
+#include <linux/init_task.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/user.h>
+#include <linux/elfcore.h>
+#include <linux/mqueue.h>
+
+//#define DEBUG
+
+/*
+ * Initial task structure. Make this a per-architecture thing,
+ * because different architectures tend to have different
+ * alignment requirements and potentially different initial
+ * setup.
+ */
+
+static struct fs_struct init_fs = INIT_FS;
+static struct files_struct init_files = INIT_FILES;
+static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
+static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
+struct mm_struct init_mm = INIT_MM(init_mm);
+
+EXPORT_SYMBOL(init_mm);
+
+/*
+ * Initial thread structure.
+ *
+ * We need to make sure that this is 8192-byte aligned due to the
+ * way process stacks are handled. This is done by having a special
+ * "init_task" linker map entry..
+ */
+union thread_union init_thread_union 
+        __attribute__((__section__(".data.init_task"))) =
+                { INIT_THREAD_INFO(init_task) };
+
+/*
+ * Initial task structure.
+ *
+ * All other task structs will be allocated on slabs in fork.c
+ */
+struct task_struct init_task = INIT_TASK(init_task);
+
+EXPORT_SYMBOL(init_task);
+
+/*
+ * The hlt_counter, disable_hlt and enable_hlt is just here as a hook if
+ * there would ever be a halt sequence (for power save when idle) with
+ * some largish delay when halting or resuming *and* a driver that can't
+ * afford that delay.  The hlt_counter would then be checked before
+ * executing the halt sequence, and the driver marks the unhaltable
+ * region by enable_hlt/disable_hlt.
+ */
+
+static int hlt_counter=0;
+
+void disable_hlt(void)
+{
+        hlt_counter++;
+}
+
+EXPORT_SYMBOL(disable_hlt);
+
+void enable_hlt(void)
+{
+        hlt_counter--;
+}
+
+EXPORT_SYMBOL(enable_hlt);
+ 
+/*
+ * The following aren't currently used.
+ */
+void (*pm_idle)(void);
+
+extern void default_idle(void);
+
+/*
+ * The idle thread. There's no useful work to be
+ * done, so just try to conserve power and have a
+ * low exit latency (ie sit in a loop waiting for
+ * somebody to say that they'd like to reschedule)
+ */
+void cpu_idle (void)
+{
+        /* endless idle loop with no priority at all */
+        while (1) {
+                while (!need_resched()) {
+                        void (*idle)(void) = pm_idle;
+
+                        if (!idle)
+                                idle = default_idle;
+
+                        idle();
+                }
+                schedule();
+        }
+
+}
+
+void hard_reset_now (void);
+
+void machine_restart(void)
+{
+        hard_reset_now();
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+/*
+ * Similar to machine_power_off, but don't shut off power.  Add code
+ * here to freeze the system for e.g. post-mortem debug purpose when
+ * possible.  This halt has nothing to do with the idle halt.
+ */
+
+void machine_halt(void)
+{
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+/* If or when software power-off is implemented, add code here.  */
+
+void machine_power_off(void)
+{
+}
+
+EXPORT_SYMBOL(machine_power_off);
+
+/*
+ * When a process does an "exec", machine state like FPU and debug
+ * registers need to be reset.  This is a hook function for that.
+ * Currently we don't have any such state to reset, so this is empty.
+ */
+
+void flush_thread(void)
+{
+}
+
+/*
+ * fill in the user structure for a core dump..
+ */
+void dump_thread(struct pt_regs * regs, struct user * dump)
+{
+#if 0
+        int i;
+
+        /* changed the size calculations - should hopefully work better. lbt */
+        dump->magic = CMAGIC;
+        dump->start_code = 0;
+        dump->start_stack = regs->esp & ~(PAGE_SIZE - 1);
+        dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
+        dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
+        dump->u_dsize -= dump->u_tsize;
+        dump->u_ssize = 0;
+        for (i = 0; i < 8; i++)
+                dump->u_debugreg[i] = current->debugreg[i];  
+
+        if (dump->start_stack < TASK_SIZE)
+                dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
+
+        dump->regs = *regs;
+
+        dump->u_fpvalid = dump_fpu (regs, &dump->i387);
+#endif 
+}
+
+/* Fill in the fpu structure for a core dump. */
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
+{
+        return 0;
+}