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Diffstat (limited to 'arch/s390/kernel/process.c')
-rw-r--r--arch/s390/kernel/process.c73
1 files changed, 35 insertions, 38 deletions
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 5cd38a90e64d..b48e961a38f6 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -1,18 +1,10 @@
/*
- * arch/s390/kernel/process.c
+ * This file handles the architecture dependent parts of process handling.
*
- * S390 version
- * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
- * Hartmut Penner (hp@de.ibm.com),
- * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
- *
- * Derived from "arch/i386/kernel/process.c"
- * Copyright (C) 1995, Linus Torvalds
- */
-
-/*
- * This file handles the architecture-dependent parts of process handling..
+ * Copyright IBM Corp. 1999,2009
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
+ * Hartmut Penner <hp@de.ibm.com>,
+ * Denis Joseph Barrow,
*/
#include <linux/compiler.h>
@@ -47,6 +39,7 @@
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/timer.h>
+#include <asm/nmi.h>
#include "entry.h"
asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
@@ -76,7 +69,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
return sf->gprs[8];
}
-extern void s390_handle_mcck(void);
/*
* The idle loop on a S390...
*/
@@ -149,6 +141,7 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
return do_fork(flags | CLONE_VM | CLONE_UNTRACED,
0, &regs, 0, NULL, NULL);
}
+EXPORT_SYMBOL(kernel_thread);
/*
* Free current thread data structures etc..
@@ -168,34 +161,35 @@ void release_thread(struct task_struct *dead_task)
}
int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
- unsigned long unused,
- struct task_struct * p, struct pt_regs * regs)
+ unsigned long unused,
+ struct task_struct *p, struct pt_regs *regs)
{
- struct fake_frame
- {
- struct stack_frame sf;
- struct pt_regs childregs;
- } *frame;
-
- frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
- p->thread.ksp = (unsigned long) frame;
+ struct thread_info *ti;
+ struct fake_frame
+ {
+ struct stack_frame sf;
+ struct pt_regs childregs;
+ } *frame;
+
+ frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
+ p->thread.ksp = (unsigned long) frame;
/* Store access registers to kernel stack of new process. */
- frame->childregs = *regs;
+ frame->childregs = *regs;
frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
- frame->childregs.gprs[15] = new_stackp;
- frame->sf.back_chain = 0;
+ frame->childregs.gprs[15] = new_stackp;
+ frame->sf.back_chain = 0;
- /* new return point is ret_from_fork */
- frame->sf.gprs[8] = (unsigned long) ret_from_fork;
+ /* new return point is ret_from_fork */
+ frame->sf.gprs[8] = (unsigned long) ret_from_fork;
- /* fake return stack for resume(), don't go back to schedule */
- frame->sf.gprs[9] = (unsigned long) frame;
+ /* fake return stack for resume(), don't go back to schedule */
+ frame->sf.gprs[9] = (unsigned long) frame;
/* Save access registers to new thread structure. */
save_access_regs(&p->thread.acrs[0]);
#ifndef CONFIG_64BIT
- /*
+ /*
* save fprs to current->thread.fp_regs to merge them with
* the emulated registers and then copy the result to the child.
*/
@@ -220,10 +214,13 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
#endif /* CONFIG_64BIT */
/* start new process with ar4 pointing to the correct address space */
p->thread.mm_segment = get_fs();
- /* Don't copy debug registers */
- memset(&p->thread.per_info,0,sizeof(p->thread.per_info));
-
- return 0;
+ /* Don't copy debug registers */
+ memset(&p->thread.per_info, 0, sizeof(p->thread.per_info));
+ /* Initialize per thread user and system timer values */
+ ti = task_thread_info(p);
+ ti->user_timer = 0;
+ ti->system_timer = 0;
+ return 0;
}
SYSCALL_DEFINE0(fork)
@@ -311,7 +308,7 @@ out:
int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
{
#ifndef CONFIG_64BIT
- /*
+ /*
* save fprs to current->thread.fp_regs to merge them with
* the emulated registers and then copy the result to the dump.
*/
@@ -322,6 +319,7 @@ int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
#endif /* CONFIG_64BIT */
return 1;
}
+EXPORT_SYMBOL(dump_fpu);
unsigned long get_wchan(struct task_struct *p)
{
@@ -346,4 +344,3 @@ unsigned long get_wchan(struct task_struct *p)
}
return 0;
}
-