allow coexistance of N build and AC build.
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / arch / sh / kernel / machine_kexec.c
blob790ed69b866670de9f5ac6d63890f740e694ff8e
1 /*
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.
12 #include <linux/mm.h>
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>
19 #include <asm/io.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
43 * later.
45 int machine_kexec_prepare(struct kimage *image)
47 return 0;
50 void machine_kexec_cleanup(struct kimage *image)
54 static void kexec_info(struct kimage *image)
56 int i;
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;
83 #else
84 vbr_reg = 0x80000000; // dummy
85 #endif
86 /* Interrupts aren't acceptable while we reboot */
87 local_irq_disable();
89 page_list = image->head;
91 /* we need both effective and real address here */
92 reboot_code_buffer =
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);
99 kexec_info(image);
100 flush_cache_all();
102 /* now call it */
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);
117 if (*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;
125 return 0;
127 early_param("crashkernel", parse_crashkernel);