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path: root/arch/sh/kernel/machine_kexec.c
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Diffstat (limited to 'arch/sh/kernel/machine_kexec.c')
-rw-r--r--arch/sh/kernel/machine_kexec.c74
1 files changed, 61 insertions, 13 deletions
diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
index 94df56b0d1f..7ea2704ea03 100644
--- a/arch/sh/kernel/machine_kexec.c
+++ b/arch/sh/kernel/machine_kexec.c
@@ -14,21 +14,22 @@
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/numa.h>
+#include <linux/ftrace.h>
+#include <linux/suspend.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/cacheflush.h>
-typedef NORET_TYPE void (*relocate_new_kernel_t)(
- unsigned long indirection_page,
- unsigned long reboot_code_buffer,
- unsigned long start_address,
- unsigned long vbr_reg) ATTRIB_NORET;
+typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
+ unsigned long reboot_code_buffer,
+ unsigned long start_address);
extern const unsigned char relocate_new_kernel[];
extern const unsigned int relocate_new_kernel_size;
extern void *gdb_vbr_vector;
+extern void *vbr_base;
void machine_shutdown(void)
{
@@ -45,6 +46,12 @@ void machine_crash_shutdown(struct pt_regs *regs)
*/
int machine_kexec_prepare(struct kimage *image)
{
+ /* older versions of kexec-tools are passing
+ * the zImage entry point as a virtual address.
+ */
+ if (image->start != PHYSADDR(image->start))
+ return -EINVAL; /* upgrade your kexec-tools */
+
return 0;
}
@@ -73,17 +80,33 @@ static void kexec_info(struct kimage *image)
*/
void machine_kexec(struct kimage *image)
{
-
unsigned long page_list;
unsigned long reboot_code_buffer;
- unsigned long vbr_reg;
relocate_new_kernel_t rnk;
+ unsigned long entry;
+ unsigned long *ptr;
+ int save_ftrace_enabled;
+
+ /*
+ * Nicked from the mips version of machine_kexec():
+ * The generic kexec code builds a page list with physical
+ * addresses. Use phys_to_virt() to convert them to virtual.
+ */
+ for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
+ ptr = (entry & IND_INDIRECTION) ?
+ phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
+ if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
+ *ptr & IND_DESTINATION)
+ *ptr = (unsigned long) phys_to_virt(*ptr);
+ }
-#if defined(CONFIG_SH_STANDARD_BIOS)
- vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100;
-#else
- vbr_reg = 0x80000000; // dummy
+#ifdef CONFIG_KEXEC_JUMP
+ if (image->preserve_context)
+ save_processor_state();
#endif
+
+ save_ftrace_enabled = __ftrace_enabled_save();
+
/* Interrupts aren't acceptable while we reboot */
local_irq_disable();
@@ -97,12 +120,37 @@ void machine_kexec(struct kimage *image)
memcpy((void *)reboot_code_buffer, relocate_new_kernel,
relocate_new_kernel_size);
- kexec_info(image);
+ kexec_info(image);
flush_cache_all();
+#if defined(CONFIG_SH_STANDARD_BIOS)
+ asm volatile("ldc %0, vbr" :
+ : "r" (((unsigned long) gdb_vbr_vector) - 0x100)
+ : "memory");
+#endif
+
/* now call it */
rnk = (relocate_new_kernel_t) reboot_code_buffer;
- (*rnk)(page_list, reboot_code_buffer, P2SEGADDR(image->start), vbr_reg);
+ (*rnk)(page_list, reboot_code_buffer,
+ (unsigned long)phys_to_virt(image->start));
+
+#ifdef CONFIG_KEXEC_JUMP
+ asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
+
+ if (image->preserve_context)
+ restore_processor_state();
+
+ /* Convert page list back to physical addresses, what a mess. */
+ for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
+ ptr = (*ptr & IND_INDIRECTION) ?
+ phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
+ if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
+ *ptr & IND_DESTINATION)
+ *ptr = virt_to_phys(*ptr);
+ }
+#endif
+
+ __ftrace_enabled_restore(save_ftrace_enabled);
}
void arch_crash_save_vmcoreinfo(void)