This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / s390 / kernel / machine_kexec.c

diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
new file mode 100644 (file)
index 0000000..bad81b5
--- /dev/null
+++ b/arch/s390/kernel/machine_kexec.c
@@ -0,0 +1,106 @@
+/*
+ * arch/s390/kernel/machine_kexec.c
+ *
+ * (C) Copyright IBM Corp. 2005
+ *
+ * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
+ *
+ */
+
+/*
+ * s390_machine_kexec.c - handle the transition of Linux booting another kernel
+ * on the S390 architecture.
+ */
+
+#include <linux/device.h>
+#include <linux/mm.h>
+#include <linux/kexec.h>
+#include <linux/delay.h>
+#include <asm/cio.h>
+#include <asm/setup.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/system.h>
+#include <asm/smp.h>
+
+static void kexec_halt_all_cpus(void *);
+
+typedef void (*relocate_kernel_t) (kimage_entry_t *, unsigned long);
+
+const extern unsigned char relocate_kernel[];
+const extern unsigned long long relocate_kernel_len;
+
+int
+machine_kexec_prepare(struct kimage *image)
+{
+       unsigned long reboot_code_buffer;
+
+       /* We don't support anything but the default image type for now. */
+       if (image->type != KEXEC_TYPE_DEFAULT)
+               return -EINVAL;
+
+       /* Get the destination where the assembler code should be copied to.*/
+       reboot_code_buffer = page_to_pfn(image->control_code_page)<<PAGE_SHIFT;
+
+       /* Then copy it */
+       memcpy((void *) reboot_code_buffer, relocate_kernel,
+              relocate_kernel_len);
+       return 0;
+}
+
+void
+machine_kexec_cleanup(struct kimage *image)
+{
+}
+
+void
+machine_shutdown(void)
+{
+       printk(KERN_INFO "kexec: machine_shutdown called\n");
+}
+
+NORET_TYPE void
+machine_kexec(struct kimage *image)
+{
+       clear_all_subchannels();
+
+       /* Disable lowcore protection */
+       ctl_clear_bit(0,28);
+
+       on_each_cpu(kexec_halt_all_cpus, image, 0, 0);
+       for (;;);
+}
+
+extern void pfault_fini(void);
+
+static void
+kexec_halt_all_cpus(void *kernel_image)
+{
+       static atomic_t cpuid = ATOMIC_INIT(-1);
+       int cpu;
+       struct kimage *image;
+       relocate_kernel_t data_mover;
+
+#ifdef CONFIG_PFAULT
+       if (MACHINE_IS_VM)
+               pfault_fini();
+#endif
+
+       if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1)
+               signal_processor(smp_processor_id(), sigp_stop);
+
+       /* Wait for all other cpus to enter stopped state */
+       for_each_online_cpu(cpu) {
+               if (cpu == smp_processor_id())
+                       continue;
+               while (!smp_cpu_not_running(cpu))
+                       cpu_relax();
+       }
+
+       image = (struct kimage *) kernel_image;
+       data_mover = (relocate_kernel_t)
+               (page_to_pfn(image->control_code_page) << PAGE_SHIFT);
+
+       /* Call the moving routine */
+       (*data_mover) (&image->head, image->start);
+}