1 files changed, 113 insertions, 0 deletions

diff --git a/arch/mips/loongson64/reset.c b/arch/mips/loongson64/reset.c
index 3bb8a1ed9348..c97bfdc8c922 100644
--- a/arch/mips/loongson64/reset.c
+++ b/arch/mips/loongson64/reset.c
@@ -6,9 +6,14 @@
  * Copyright (C) 2009 Lemote, Inc.
  * Author: Zhangjin Wu, wuzhangjin@gmail.com
  */
+#include <linux/cpu.h>
+#include <linux/delay.h>
 #include <linux/init.h>
+#include <linux/kexec.h>
 #include <linux/pm.h>
+#include <linux/slab.h>
 
+#include <asm/bootinfo.h>
 #include <asm/idle.h>
 #include <asm/reboot.h>
 
@@ -47,12 +52,120 @@ static void loongson_halt(void)
 	}
 }
 
+#ifdef CONFIG_KEXEC
+
+/* 0X80000000~0X80200000 is safe */
+#define MAX_ARGS	64
+#define KEXEC_CTRL_CODE	0xFFFFFFFF80100000UL
+#define KEXEC_ARGV_ADDR	0xFFFFFFFF80108000UL
+#define KEXEC_ARGV_SIZE	COMMAND_LINE_SIZE
+#define KEXEC_ENVP_SIZE	4800
+
+static int kexec_argc;
+static int kdump_argc;
+static void *kexec_argv;
+static void *kdump_argv;
+static void *kexec_envp;
+
+static int loongson_kexec_prepare(struct kimage *image)
+{
+	int i, argc = 0;
+	unsigned int *argv;
+	char *str, *ptr, *bootloader = "kexec";
+
+	/* argv at offset 0, argv[] at offset KEXEC_ARGV_SIZE/2 */
+	if (image->type == KEXEC_TYPE_DEFAULT)
+		argv = (unsigned int *)kexec_argv;
+	else
+		argv = (unsigned int *)kdump_argv;
+
+	argv[argc++] = (unsigned int)(KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2);
+
+	for (i = 0; i < image->nr_segments; i++) {
+		if (!strncmp(bootloader, (char *)image->segment[i].buf,
+				strlen(bootloader))) {
+			/*
+			 * convert command line string to array
+			 * of parameters (as bootloader does).
+			 */
+			int offt;
+			str = (char *)argv + KEXEC_ARGV_SIZE/2;
+			memcpy(str, image->segment[i].buf, KEXEC_ARGV_SIZE/2);
+			ptr = strchr(str, ' ');
+
+			while (ptr && (argc < MAX_ARGS)) {
+				*ptr = '\0';
+				if (ptr[1] != ' ') {
+					offt = (int)(ptr - str + 1);
+					argv[argc] = KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2 + offt;
+					argc++;
+				}
+				ptr = strchr(ptr + 1, ' ');
+			}
+			break;
+		}
+	}
+
+	if (image->type == KEXEC_TYPE_DEFAULT)
+		kexec_argc = argc;
+	else
+		kdump_argc = argc;
+
+	/* kexec/kdump need a safe page to save reboot_code_buffer */
+	image->control_code_page = virt_to_page((void *)KEXEC_CTRL_CODE);
+
+	return 0;
+}
+
+static void loongson_kexec_shutdown(void)
+{
+#ifdef CONFIG_SMP
+	int cpu;
+
+	/* All CPUs go to reboot_code_buffer */
+	for_each_possible_cpu(cpu)
+		if (!cpu_online(cpu))
+			cpu_device_up(get_cpu_device(cpu));
+#endif
+	kexec_args[0] = kexec_argc;
+	kexec_args[1] = fw_arg1;
+	kexec_args[2] = fw_arg2;
+	secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
+	memcpy((void *)fw_arg1, kexec_argv, KEXEC_ARGV_SIZE);
+	memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
+}
+
+static void loongson_crash_shutdown(struct pt_regs *regs)
+{
+	default_machine_crash_shutdown(regs);
+	kexec_args[0] = kdump_argc;
+	kexec_args[1] = fw_arg1;
+	kexec_args[2] = fw_arg2;
+	secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
+	memcpy((void *)fw_arg1, kdump_argv, KEXEC_ARGV_SIZE);
+	memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
+}
+
+#endif
+
 static int __init mips_reboot_setup(void)
 {
 	_machine_restart = loongson_restart;
 	_machine_halt = loongson_halt;
 	pm_power_off = loongson_poweroff;
 
+#ifdef CONFIG_KEXEC
+	kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
+	kdump_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
+	kexec_envp = kmalloc(KEXEC_ENVP_SIZE, GFP_KERNEL);
+	fw_arg1 = KEXEC_ARGV_ADDR;
+	memcpy(kexec_envp, (void *)fw_arg2, KEXEC_ENVP_SIZE);
+
+	_machine_kexec_prepare = loongson_kexec_prepare;
+	_machine_kexec_shutdown = loongson_kexec_shutdown;
+	_machine_crash_shutdown = loongson_crash_shutdown;
+#endif
+
 	return 0;
 }