1 files changed, 396 insertions, 0 deletions

diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
new file mode 100644
index 000000000000..46e4a6881f11
--- /dev/null
+++ b/arch/parisc/kernel/process.c
@@ -0,0 +1,396 @@
+/*
+ *    PARISC Architecture-dependent parts of process handling
+ *    based on the work for i386
+ *
+ *    Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
+ *    Copyright (C) 2000 Martin K Petersen <mkp at mkp.net>
+ *    Copyright (C) 2000 John Marvin <jsm at parisc-linux.org>
+ *    Copyright (C) 2000 David Huggins-Daines <dhd with pobox.org>
+ *    Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
+ *    Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org>
+ *    Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com>
+ *    Copyright (C) 2000 Richard Hirst <rhirst with parisc-lixux.org>
+ *    Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org>
+ *    Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org>
+ *    Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
+ *    Copyright (C) 2001-2002 Helge Deller <deller at parisc-linux.org>
+ *    Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
+ *
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <stdarg.h>
+
+#include <linux/elf.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/personality.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/kallsyms.h>
+
+#include <asm/io.h>
+#include <asm/offsets.h>
+#include <asm/pdc.h>
+#include <asm/pdc_chassis.h>
+#include <asm/pgalloc.h>
+#include <asm/uaccess.h>
+#include <asm/unwind.h>
+
+static int hlt_counter;
+
+/*
+ * Power off function, if any
+ */ 
+void (*pm_power_off)(void);
+
+void disable_hlt(void)
+{
+        hlt_counter++;
+}
+
+EXPORT_SYMBOL(disable_hlt);
+
+void enable_hlt(void)
+{
+        hlt_counter--;
+}
+
+EXPORT_SYMBOL(enable_hlt);
+
+void default_idle(void)
+{
+        barrier();
+}
+
+/*
+ * 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())
+                        barrier();
+                schedule();
+                check_pgt_cache();
+        }
+}
+
+
+#ifdef __LP64__
+#define COMMAND_GLOBAL  0xfffffffffffe0030UL
+#else
+#define COMMAND_GLOBAL  0xfffe0030
+#endif
+
+#define CMD_RESET       5       /* reset any module */
+
+/*
+** The Wright Brothers and Gecko systems have a H/W problem
+** (Lasi...'nuf said) may cause a broadcast reset to lockup
+** the system. An HVERSION dependent PDC call was developed
+** to perform a "safe", platform specific broadcast reset instead
+** of kludging up all the code.
+**
+** Older machines which do not implement PDC_BROADCAST_RESET will
+** return (with an error) and the regular broadcast reset can be
+** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET
+** the PDC call will not return (the system will be reset).
+*/
+void machine_restart(char *cmd)
+{
+#ifdef FASTBOOT_SELFTEST_SUPPORT
+        /*
+         ** If user has modified the Firmware Selftest Bitmap,
+         ** run the tests specified in the bitmap after the
+         ** system is rebooted w/PDC_DO_RESET.
+         **
+         ** ftc_bitmap = 0x1AUL "Skip destructive memory tests"
+         **
+         ** Using "directed resets" at each processor with the MEM_TOC
+         ** vector cleared will also avoid running destructive
+         ** memory self tests. (Not implemented yet)
+         */
+        if (ftc_bitmap) {
+                pdc_do_firm_test_reset(ftc_bitmap);
+        }
+#endif
+        /* set up a new led state on systems shipped with a LED State panel */
+        pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
+        
+        /* "Normal" system reset */
+        pdc_do_reset();
+
+        /* Nope...box should reset with just CMD_RESET now */
+        gsc_writel(CMD_RESET, COMMAND_GLOBAL);
+
+        /* Wait for RESET to lay us to rest. */
+        while (1) ;
+
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+void machine_halt(void)
+{
+        /*
+        ** The LED/ChassisCodes are updated by the led_halt()
+        ** function, called by the reboot notifier chain.
+        */
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+
+/*
+ * This routine is called from sys_reboot to actually turn off the
+ * machine 
+ */
+void machine_power_off(void)
+{
+        /* If there is a registered power off handler, call it. */
+        if(pm_power_off)
+                pm_power_off();
+
+        /* Put the soft power button back under hardware control.
+         * If the user had already pressed the power button, the
+         * following call will immediately power off. */
+        pdc_soft_power_button(0);
+        
+        pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN);
+                
+        /* It seems we have no way to power the system off via
+         * software. The user has to press the button himself. */
+
+        printk(KERN_EMERG "System shut down completed.\n"
+               KERN_EMERG "Please power this system off now.");
+}
+
+EXPORT_SYMBOL(machine_power_off);
+
+
+/*
+ * Create a kernel thread
+ */
+
+extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
+pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
+{
+
+        /*
+         * FIXME: Once we are sure we don't need any debug here,
+         *        kernel_thread can become a #define.
+         */
+
+        return __kernel_thread(fn, arg, flags);
+}
+EXPORT_SYMBOL(kernel_thread);
+
+/*
+ * Free current thread data structures etc..
+ */
+void exit_thread(void)
+{
+}
+
+void flush_thread(void)
+{
+        /* Only needs to handle fpu stuff or perf monitors.
+        ** REVISIT: several arches implement a "lazy fpu state".
+        */
+        set_fs(USER_DS);
+}
+
+void release_thread(struct task_struct *dead_task)
+{
+}
+
+/*
+ * Fill in the FPU structure for a core dump.
+ */
+
+int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r)
+{
+        if (regs == NULL)
+                return 0;
+
+        memcpy(r, regs->fr, sizeof *r);
+        return 1;
+}
+
+int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r)
+{
+        memcpy(r, tsk->thread.regs.fr, sizeof(*r));
+        return 1;
+}
+
+/* Note that "fork()" is implemented in terms of clone, with
+   parameters (SIGCHLD, regs->gr[30], regs). */
+int
+sys_clone(unsigned long clone_flags, unsigned long usp,
+          struct pt_regs *regs)
+{
+        int __user *user_tid = (int __user *)regs->gr[26];
+
+        /* usp must be word aligned.  This also prevents users from
+         * passing in the value 1 (which is the signal for a special
+         * return for a kernel thread) */
+        usp = ALIGN(usp, 4);
+
+        /* A zero value for usp means use the current stack */
+        if(usp == 0)
+                usp = regs->gr[30];
+
+        return do_fork(clone_flags, usp, regs, 0, user_tid, NULL);
+}
+
+int
+sys_vfork(struct pt_regs *regs)
+{
+        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gr[30], regs, 0, NULL, NULL);
+}
+
+int
+copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
+            unsigned long unused,       /* in ia64 this is "user_stack_size" */
+            struct task_struct * p, struct pt_regs * pregs)
+{
+        struct pt_regs * cregs = &(p->thread.regs);
+        struct thread_info *ti = p->thread_info;
+        
+        /* We have to use void * instead of a function pointer, because
+         * function pointers aren't a pointer to the function on 64-bit.
+         * Make them const so the compiler knows they live in .text */
+        extern void * const ret_from_kernel_thread;
+        extern void * const child_return;
+#ifdef CONFIG_HPUX
+        extern void * const hpux_child_return;
+#endif
+
+        *cregs = *pregs;
+
+        /* Set the return value for the child.  Note that this is not
+           actually restored by the syscall exit path, but we put it
+           here for consistency in case of signals. */
+        cregs->gr[28] = 0; /* child */
+
+        /*
+         * We need to differentiate between a user fork and a
+         * kernel fork. We can't use user_mode, because the
+         * the syscall path doesn't save iaoq. Right now
+         * We rely on the fact that kernel_thread passes
+         * in zero for usp.
+         */
+        if (usp == 1) {
+                /* kernel thread */
+                cregs->ksp = (((unsigned long)(ti)) + THREAD_SZ_ALGN);
+                /* Must exit via ret_from_kernel_thread in order
+                 * to call schedule_tail()
+                 */
+                cregs->kpc = (unsigned long) &ret_from_kernel_thread;
+                /*
+                 * Copy function and argument to be called from
+                 * ret_from_kernel_thread.
+                 */
+#ifdef __LP64__
+                cregs->gr[27] = pregs->gr[27];
+#endif
+                cregs->gr[26] = pregs->gr[26];
+                cregs->gr[25] = pregs->gr[25];
+        } else {
+                /* user thread */
+                /*
+                 * Note that the fork wrappers are responsible
+                 * for setting gr[21].
+                 */
+
+                /* Use same stack depth as parent */
+                cregs->ksp = ((unsigned long)(ti))
+                        + (pregs->gr[21] & (THREAD_SIZE - 1));
+                cregs->gr[30] = usp;
+                if (p->personality == PER_HPUX) {
+#ifdef CONFIG_HPUX
+                        cregs->kpc = (unsigned long) &hpux_child_return;
+#else
+                        BUG();
+#endif
+                } else {
+                        cregs->kpc = (unsigned long) &child_return;
+                }
+        }
+
+        return 0;
+}
+
+unsigned long thread_saved_pc(struct task_struct *t)
+{
+        return t->thread.regs.kpc;
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+
+asmlinkage int sys_execve(struct pt_regs *regs)
+{
+        int error;
+        char *filename;
+
+        filename = getname((const char __user *) regs->gr[26]);
+        error = PTR_ERR(filename);
+        if (IS_ERR(filename))
+                goto out;
+        error = do_execve(filename, (char __user **) regs->gr[25],
+                (char __user **) regs->gr[24], regs);
+        if (error == 0) {
+                task_lock(current);
+                current->ptrace &= ~PT_DTRACE;
+                task_unlock(current);
+        }
+        putname(filename);
+out:
+
+        return error;
+}
+
+unsigned long 
+get_wchan(struct task_struct *p)
+{
+        struct unwind_frame_info info;
+        unsigned long ip;
+        int count = 0;
+        /*
+         * These bracket the sleeping functions..
+         */
+
+        unwind_frame_init_from_blocked_task(&info, p);
+        do {
+                if (unwind_once(&info) < 0)
+                        return 0;
+                ip = info.ip;
+                if (!in_sched_functions(ip))
+                        return ip;
+        } while (count++ < 16);
+        return 0;
+}