4 files changed, 163 insertions, 0 deletions

diff --git a/arch/s390/kernel/crash.c b/arch/s390/kernel/crash.c
new file mode 100644
index 00000000000..8cc7c9fa64f
--- /dev/null
+++ b/arch/s390/kernel/crash.c
@@ -0,0 +1,16 @@
+/*
+ * arch/s390/kernel/crash.c
+ *
+ * (C) Copyright IBM Corp. 2005
+ *
+ * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
+ *
+ */
+
+#include <linux/threads.h>
+#include <linux/kexec.h>
+#include <linux/reboot.h>
+
+void machine_crash_shutdown(struct pt_regs *regs)
+{
+}
diff --git a/arch/s390/kernel/init_task.c b/arch/s390/kernel/init_task.c
new file mode 100644
index 00000000000..4d1c9fb0b54
--- /dev/null
+++ b/arch/s390/kernel/init_task.c
@@ -0,0 +1,38 @@
+/*
+ *  arch/s390/kernel/init_task.c
+ *
+ *  S390 version
+ *
+ *  Derived from "arch/i386/kernel/init_task.c"
+ */
+
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init_task.h>
+#include <linux/mqueue.h>
+
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+
+static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
+static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
+/*
+ * Initial thread structure.
+ *
+ * We need to make sure that this is THREAD_SIZE 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 __init_task_data =
+        { 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);
diff --git a/arch/s390/kernel/switch_cpu.S b/arch/s390/kernel/switch_cpu.S
new file mode 100644
index 00000000000..bfe070bc765
--- /dev/null
+++ b/arch/s390/kernel/switch_cpu.S
@@ -0,0 +1,58 @@
+/*
+ * 31-bit switch cpu code
+ *
+ * Copyright IBM Corp. 2009
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/ptrace.h>
+
+# smp_switch_to_cpu switches to destination cpu and executes the passed function
+# Parameter: %r2 - function to call
+#            %r3 - function parameter
+#            %r4 - stack poiner
+#            %r5 - current cpu
+#            %r6 - destination cpu
+
+        .section .text
+ENTRY(smp_switch_to_cpu)
+        stm     %r6,%r15,__SF_GPRS(%r15)
+        lr      %r1,%r15
+        ahi     %r15,-STACK_FRAME_OVERHEAD
+        st      %r1,__SF_BACKCHAIN(%r15)
+        basr    %r13,0
+0:      la      %r1,.gprregs_addr-0b(%r13)
+        l       %r1,0(%r1)
+        stm     %r0,%r15,0(%r1)
+1:      sigp    %r0,%r6,__SIGP_RESTART  /* start destination CPU */
+        brc     2,1b                    /* busy, try again */
+2:      sigp    %r0,%r5,__SIGP_STOP     /* stop current CPU */
+        brc     2,2b                    /* busy, try again */
+3:      j       3b
+
+ENTRY(smp_restart_cpu)
+        basr    %r13,0
+0:      la      %r1,.gprregs_addr-0b(%r13)
+        l       %r1,0(%r1)
+        lm      %r0,%r15,0(%r1)
+1:      sigp    %r0,%r5,__SIGP_SENSE    /* Wait for calling CPU */
+        brc     10,1b                   /* busy, accepted (status 0), running */
+        tmll    %r0,0x40                /* Test if calling CPU is stopped */
+        jz      1b
+        ltr     %r4,%r4                 /* New stack ? */
+        jz      1f
+        lr      %r15,%r4
+1:      lr      %r14,%r2                /* r14: Function to call */
+        lr      %r2,%r3                 /* r2 : Parameter for function*/
+        basr    %r14,%r14               /* Call function */
+
+.gprregs_addr:
+        .long   .gprregs
+
+        .section .data,"aw",@progbits
+.gprregs:
+        .rept   16
+        .long   0
+        .endr
diff --git a/arch/s390/kernel/switch_cpu64.S b/arch/s390/kernel/switch_cpu64.S
new file mode 100644
index 00000000000..fcc42d799e4
--- /dev/null
+++ b/arch/s390/kernel/switch_cpu64.S
@@ -0,0 +1,51 @@
+/*
+ * 64-bit switch cpu code
+ *
+ * Copyright IBM Corp. 2009
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/ptrace.h>
+
+# smp_switch_to_cpu switches to destination cpu and executes the passed function
+# Parameter: %r2 - function to call
+#            %r3 - function parameter
+#            %r4 - stack poiner
+#            %r5 - current cpu
+#            %r6 - destination cpu
+
+        .section .text
+ENTRY(smp_switch_to_cpu)
+        stmg    %r6,%r15,__SF_GPRS(%r15)
+        lgr     %r1,%r15
+        aghi    %r15,-STACK_FRAME_OVERHEAD
+        stg     %r1,__SF_BACKCHAIN(%r15)
+        larl    %r1,.gprregs
+        stmg    %r0,%r15,0(%r1)
+1:      sigp    %r0,%r6,__SIGP_RESTART  /* start destination CPU */
+        brc     2,1b                    /* busy, try again */
+2:      sigp    %r0,%r5,__SIGP_STOP     /* stop current CPU */
+        brc     2,2b                    /* busy, try again */
+3:      j       3b
+
+ENTRY(smp_restart_cpu)
+        larl    %r1,.gprregs
+        lmg     %r0,%r15,0(%r1)
+1:      sigp    %r0,%r5,__SIGP_SENSE    /* Wait for calling CPU */
+        brc     10,1b                   /* busy, accepted (status 0), running */
+        tmll    %r0,0x40                /* Test if calling CPU is stopped */
+        jz      1b
+        ltgr    %r4,%r4                 /* New stack ? */
+        jz      1f
+        lgr     %r15,%r4
+1:      lgr     %r14,%r2                /* r14: Function to call */
+        lgr     %r2,%r3                 /* r2 : Parameter for function*/
+        basr    %r14,%r14               /* Call function */
+
+        .section .data,"aw",@progbits
+.gprregs:
+        .rept   16
+        .quad   0
+        .endr