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authorGeert Uytterhoeven <geert@linux-m68k.org>2013-08-20 22:51:47 +0200
committerGeert Uytterhoeven <geert@linux-m68k.org>2013-12-08 11:01:47 +0100
commit7d5f5fa276efbbe45f0ed270b3f4e4a2816398c2 (patch)
tree34e7ba2d35c238bd80bfdbacbc03f209da587942 /arch/m68k/kernel/machine_kexec.c
parent6cf30b35475435f453d87838fb14ad3483955a19 (diff)
m68k: Add kexec support
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/kernel/machine_kexec.c')
-rw-r--r--arch/m68k/kernel/machine_kexec.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/m68k/kernel/machine_kexec.c b/arch/m68k/kernel/machine_kexec.c
new file mode 100644
index 000000000000..d4affc917d9d
--- /dev/null
+++ b/arch/m68k/kernel/machine_kexec.c
@@ -0,0 +1,58 @@
+/*
+ * machine_kexec.c - handle transition of Linux booting another kernel
+ */
+#include <linux/compiler.h>
+#include <linux/kexec.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+
+#include <asm/cacheflush.h>
+#include <asm/page.h>
+#include <asm/setup.h>
+
+extern const unsigned char relocate_new_kernel[];
+extern const size_t relocate_new_kernel_size;
+
+int machine_kexec_prepare(struct kimage *kimage)
+{
+ return 0;
+}
+
+void machine_kexec_cleanup(struct kimage *kimage)
+{
+}
+
+void machine_shutdown(void)
+{
+}
+
+void machine_crash_shutdown(struct pt_regs *regs)
+{
+}
+
+typedef void (*relocate_kernel_t)(unsigned long ptr,
+ unsigned long start,
+ unsigned long cpu_mmu_flags) __noreturn;
+
+void machine_kexec(struct kimage *image)
+{
+ void *reboot_code_buffer;
+ unsigned long cpu_mmu_flags;
+
+ reboot_code_buffer = page_address(image->control_code_page);
+
+ memcpy(reboot_code_buffer, relocate_new_kernel,
+ relocate_new_kernel_size);
+
+ /*
+ * we do not want to be bothered.
+ */
+ local_irq_disable();
+
+ pr_info("Will call new kernel at 0x%08lx. Bye...\n", image->start);
+ __flush_cache_all();
+ cpu_mmu_flags = m68k_cputype | m68k_mmutype << 8;
+ ((relocate_kernel_t) reboot_code_buffer)(image->head & PAGE_MASK,
+ image->start,
+ cpu_mmu_flags);
+}