Initial import

1 files changed, 207 insertions, 0 deletions

diff --git a/arch/sh/kernel/machine_kexec.c b/arch/sh/kernel/machine_kexec.c
new file mode 100644
index 000000000..9fea49f6e
--- /dev/null
+++ b/arch/sh/kernel/machine_kexec.c
@@ -0,0 +1,207 @@
+/*
+ * 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
+ * LANDISK/sh4 supported by kogiidena
+ *
+ * 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 <linux/numa.h>
+#include <linux/ftrace.h>
+#include <linux/suspend.h>
+#include <linux/memblock.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/cacheflush.h>
+#include <asm/sh_bios.h>
+#include <asm/reboot.h>
+
+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 *vbr_base;
+
+void native_machine_crash_shutdown(struct pt_regs *regs)
+{
+	/* Nothing to do for UP, but definitely broken for SMP.. */
+}
+
+/*
+ * 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)
+{
+	return 0;
+}
+
+void machine_kexec_cleanup(struct kimage *image)
+{
+}
+
+static void kexec_info(struct kimage *image)
+{
+        int i;
+	printk("kexec information\n");
+	for (i = 0; i < image->nr_segments; i++) {
+	        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].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.
+ */
+void machine_kexec(struct kimage *image)
+{
+	unsigned long page_list;
+	unsigned long reboot_code_buffer;
+	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);
+	}
+
+#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();
+
+	page_list = image->head;
+
+	/* we need both effective and real address here */
+	reboot_code_buffer =
+			(unsigned long)page_address(image->control_code_page);
+
+	/* copy our kernel relocation code to the control code page */
+	memcpy((void *)reboot_code_buffer, relocate_new_kernel,
+						relocate_new_kernel_size);
+
+	kexec_info(image);
+	flush_cache_all();
+
+	sh_bios_vbr_reload();
+
+	/* now call it */
+	rnk = (relocate_new_kernel_t) reboot_code_buffer;
+	(*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)
+{
+#ifdef CONFIG_NUMA
+	VMCOREINFO_SYMBOL(node_data);
+	VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
+#endif
+#ifdef CONFIG_X2TLB
+	VMCOREINFO_CONFIG(X2TLB);
+#endif
+}
+
+void __init reserve_crashkernel(void)
+{
+	unsigned long long crash_size, crash_base;
+	int ret;
+
+	ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
+			&crash_size, &crash_base);
+	if (ret == 0 && crash_size > 0) {
+		crashk_res.start = crash_base;
+		crashk_res.end = crash_base + crash_size - 1;
+	}
+
+	if (crashk_res.end == crashk_res.start)
+		goto disable;
+
+	crash_size = PAGE_ALIGN(resource_size(&crashk_res));
+	if (!crashk_res.start) {
+		unsigned long max = memblock_end_of_DRAM() - memory_limit;
+		crashk_res.start = __memblock_alloc_base(crash_size, PAGE_SIZE, max);
+		if (!crashk_res.start) {
+			pr_err("crashkernel allocation failed\n");
+			goto disable;
+		}
+	} else {
+		ret = memblock_reserve(crashk_res.start, crash_size);
+		if (unlikely(ret < 0)) {
+			pr_err("crashkernel reservation failed - "
+			       "memory is in use\n");
+			goto disable;
+		}
+	}
+
+	crashk_res.end = crashk_res.start + crash_size - 1;
+
+	/*
+	 * Crash kernel trumps memory limit
+	 */
+	if ((memblock_end_of_DRAM() - memory_limit) <= crashk_res.end) {
+		memory_limit = 0;
+		pr_info("Disabled memory limit for crashkernel\n");
+	}
+
+	pr_info("Reserving %ldMB of memory at 0x%08lx "
+		"for crashkernel (System RAM: %ldMB)\n",
+		(unsigned long)(crash_size >> 20),
+		(unsigned long)(crashk_res.start),
+		(unsigned long)(memblock_phys_mem_size() >> 20));
+
+	return;
+
+disable:
+	crashk_res.start = crashk_res.end = 0;
+}