sh: kdump support.

This adds support for kexec based crash dumps.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 25 insertions, 4 deletions

diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
index 08587cdb64d6..790ed69b8666 100644
--- a/arch/sh/kernel/machine_kexec.c
+++ b/arch/sh/kernel/machine_kexec.c
@@ -59,13 +59,13 @@ static void kexec_info(struct kimage *image)
                 printk("  segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
                        i,
                        (unsigned int)image->segment[i].mem,
-                       (unsigned int)image->segment[i].mem + image->segment[i].memsz,
+                       (unsigned int)image->segment[i].mem +
+                                     image->segment[i].memsz,
                        (unsigned int)image->segment[i].memsz);
-        }
+        }
         printk("  start     : 0x%08x\n\n", (unsigned int)image->start);
 }
 
-
 /*
  * Do not allocate memory (or fail in any way) in machine_kexec().
  * We are past the point of no return, committed to rebooting now.
@@ -101,6 +101,27 @@ NORET_TYPE void machine_kexec(struct kimage *image)
 
         /* now call it */
         rnk = (relocate_new_kernel_t) reboot_code_buffer;
-        (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg);
+        (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg);
 }
 
+/* crashkernel=size@addr specifies the location to reserve for
+ * a crash kernel.  By reserving this memory we guarantee
+ * that linux never sets it up as a DMA target.
+ * Useful for holding code to do something appropriate
+ * after a kernel panic.
+ */
+static int __init parse_crashkernel(char *arg)
+{
+        unsigned long size, base;
+        size = memparse(arg, &arg);
+        if (*arg == '@') {
+                base = memparse(arg+1, &arg);
+                /* FIXME: Do I want a sanity check
+                 * to validate the memory range?
+                 */
+                crashk_res.start = base;
+                crashk_res.end   = base + size - 1;
+        }
+        return 0;
+}
+early_param("crashkernel", parse_crashkernel);