1 /* 2 * machine_kexec.c - handle transition of Linux booting another kernel 3 * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> 4 * 5 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz 6 * LANDISK/sh4 supported by kogiidena 7 * 8 * This source code is licensed under the GNU General Public License, 9 * Version 2. See the file COPYING for more details. 10 */ 11 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> 21 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; 27 28 extern const unsigned char relocate_new_kernel[]; 29 extern const unsigned int relocate_new_kernel_size; 30 extern void *gdb_vbr_vector; 31 32 void machine_shutdown(void) 33 { 34 } 35 36 void machine_crash_shutdown(struct pt_regs *regs) 37 { 38 } 39 40 /* 41 * Do what every setup is needed on image and the 42 * reboot code buffer to allow us to avoid allocations 43 * later. 44 */ 45 int machine_kexec_prepare(struct kimage *image) 46 { 47 return 0; 48 } 49 50 void machine_kexec_cleanup(struct kimage *image) 51 { 52 } 53 54 static void kexec_info(struct kimage *image) 55 { 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", 60 i, 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); 65 } 66 printk(" start : 0x%08x\n\n", (unsigned int)image->start); 67 } 68 69 /* 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. 72 */ 73 void machine_kexec(struct kimage *image) 74 { 75 76 unsigned long page_list; 77 unsigned long reboot_code_buffer; 78 unsigned long vbr_reg; 79 relocate_new_kernel_t rnk; 80 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(); 88 89 page_list = image->head; 90 91 /* we need both effective and real address here */ 92 reboot_code_buffer = 93 (unsigned long)page_address(image->control_code_page); 94 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); 98 99 kexec_info(image); 100 flush_cache_all(); 101 102 /* now call it */ 103 rnk = (relocate_new_kernel_t) reboot_code_buffer; 104 (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg); 105 } 106 107