1 files changed, 122 insertions, 0 deletions

diff --git a/arch/ppc/kernel/machine_kexec.c b/arch/ppc/kernel/machine_kexec.c
new file mode 100644
index 000000000000..435ad9ea0a83
--- /dev/null
+++ b/arch/ppc/kernel/machine_kexec.c
@@ -0,0 +1,122 @@
+/*
+ * machine_kexec.c - handle transition of Linux booting another kernel
+ * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
+ *
+ * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ */
+
+#include <linux/mm.h>
+#include <linux/kexec.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/hw_irq.h>
+#include <asm/cacheflush.h>
+#include <asm/machdep.h>
+
+typedef NORET_TYPE void (*relocate_new_kernel_t)(
+        unsigned long indirection_page, unsigned long reboot_code_buffer,
+        unsigned long start_address) ATTRIB_NORET;
+
+const extern unsigned char relocate_new_kernel[];
+const extern unsigned int relocate_new_kernel_size;
+
+void machine_shutdown(void)
+{
+        if (ppc_md.machine_shutdown) {
+                ppc_md.machine_shutdown();
+        }
+}
+
+void machine_crash_shutdown(void)
+{
+        if (ppc_md.machine_crash_shutdown) {
+                ppc_md.machine_crash_shutdown();
+        }
+}
+
+/*
+ * Do what every setup is needed on image and the
+ * reboot code buffer to allow us to avoid allocations
+ * later.
+ */
+int machine_kexec_prepare(struct kimage *image)
+{
+        if (ppc_md.machine_kexec_prepare) {
+                return ppc_md.machine_kexec_prepare(image);
+        }
+        /*
+         * Fail if platform doesn't provide its own machine_kexec_prepare
+         * implementation.
+         */
+        return -ENOSYS;
+}
+
+void machine_kexec_cleanup(struct kimage *image)
+{
+        if (ppc_md.machine_kexec_cleanup) {
+                ppc_md.machine_kexec_cleanup(image);
+        }
+}
+
+/*
+ * Do not allocate memory (or fail in any way) in machine_kexec().
+ * We are past the point of no return, committed to rebooting now.
+ */
+NORET_TYPE void machine_kexec(struct kimage *image)
+{
+        if (ppc_md.machine_kexec) {
+                ppc_md.machine_kexec(image);
+        } else {
+                /*
+                 * Fall back to normal restart if platform doesn't provide
+                 * its own kexec function, and user insist to kexec...
+                 */
+                machine_restart(NULL);
+        }
+        for(;;);
+}
+
+
+/*
+ * This is a generic machine_kexec function suitable at least for
+ * non-OpenFirmware embedded platforms.
+ * It merely copies the image relocation code to the control page and
+ * jumps to it.
+ * A platform specific function may just call this one.
+ */
+void machine_kexec_simple(struct kimage *image)
+{
+        unsigned long page_list;
+        unsigned long reboot_code_buffer, reboot_code_buffer_phys;
+        relocate_new_kernel_t rnk;
+
+        /* Interrupts aren't acceptable while we reboot */
+        local_irq_disable();
+
+        page_list = image->head;
+
+        /* we need both effective and real address here */
+        reboot_code_buffer =
+                (unsigned long)page_address(image->control_code_page);
+        reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);
+
+        /* copy our kernel relocation code to the control code page */
+        memcpy((void *)reboot_code_buffer,
+                relocate_new_kernel, relocate_new_kernel_size);
+
+        flush_icache_range(reboot_code_buffer,
+                reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
+        printk(KERN_INFO "Bye!\n");
+
+        /* now call it */
+        rnk = (relocate_new_kernel_t) reboot_code_buffer;
+        (*rnk)(page_list, reboot_code_buffer_phys, image->start);
+}
+