2 * machine_kexec.c - handle transition of Linux booting another kernel
3 * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
5 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
6 * LANDISK/sh4 supported by kogiidena
8 * This source code is licensed under the GNU General Public License,
9 * Version 2. See the file COPYING for more details.
13 #include <linux/kexec.h>
14 #include <linux/delay.h>
15 #include <linux/reboot.h>
16 #include <asm/pgtable.h>
17 #include <asm/pgalloc.h>
18 #include <asm/mmu_context.h>
20 #include <asm/cacheflush.h>
22 typedef NORET_TYPE
void (*relocate_new_kernel_t
)(
23 unsigned long indirection_page
,
24 unsigned long reboot_code_buffer
,
25 unsigned long start_address
,
26 unsigned long vbr_reg
) ATTRIB_NORET
;
28 extern const unsigned char relocate_new_kernel
[];
29 extern const unsigned int relocate_new_kernel_size
;
30 extern void *gdb_vbr_vector
;
32 void machine_shutdown(void)
36 void machine_crash_shutdown(struct pt_regs
*regs
)
41 * Do what every setup is needed on image and the
42 * reboot code buffer to allow us to avoid allocations
45 int machine_kexec_prepare(struct kimage
*image
)
50 void machine_kexec_cleanup(struct kimage
*image
)
54 static void kexec_info(struct kimage
*image
)
57 printk("kexec information\n");
58 for (i
= 0; i
< image
->nr_segments
; i
++) {
59 printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n",
61 (unsigned int)image
->segment
[i
].mem
,
62 (unsigned int)image
->segment
[i
].mem
+
63 image
->segment
[i
].memsz
,
64 (unsigned int)image
->segment
[i
].memsz
);
66 printk(" start : 0x%08x\n\n", (unsigned int)image
->start
);
70 * Do not allocate memory (or fail in any way) in machine_kexec().
71 * We are past the point of no return, committed to rebooting now.
73 NORET_TYPE
void machine_kexec(struct kimage
*image
)
76 unsigned long page_list
;
77 unsigned long reboot_code_buffer
;
78 unsigned long vbr_reg
;
79 relocate_new_kernel_t rnk
;
81 #if defined(CONFIG_SH_STANDARD_BIOS)
82 vbr_reg
= ((unsigned long )gdb_vbr_vector
) - 0x100;
84 vbr_reg
= 0x80000000; // dummy
86 /* Interrupts aren't acceptable while we reboot */
89 page_list
= image
->head
;
91 /* we need both effective and real address here */
93 (unsigned long)page_address(image
->control_code_page
);
95 /* copy our kernel relocation code to the control code page */
96 memcpy((void *)reboot_code_buffer
, relocate_new_kernel
,
97 relocate_new_kernel_size
);
103 rnk
= (relocate_new_kernel_t
) reboot_code_buffer
;
104 (*rnk
)(page_list
, reboot_code_buffer
, image
->start
, vbr_reg
);
107 /* crashkernel=size@addr specifies the location to reserve for
108 * a crash kernel. By reserving this memory we guarantee
109 * that linux never sets it up as a DMA target.
110 * Useful for holding code to do something appropriate
111 * after a kernel panic.
113 static int __init
parse_crashkernel(char *arg
)
115 unsigned long size
, base
;
116 size
= memparse(arg
, &arg
);
118 base
= memparse(arg
+1, &arg
);
119 /* FIXME: Do I want a sanity check
120 * to validate the memory range?
122 crashk_res
.start
= base
;
123 crashk_res
.end
= base
+ size
- 1;
127 early_param("crashkernel", parse_crashkernel
);