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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | /* * 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 * * 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 <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/mmu_context.h> #include <asm/io.h> #include <asm/hw_irq.h> #include <asm/cacheflush.h> #include <asm/machdep.h> typedef NORET_TYPE void (*relocate_new_kernel_t)( unsigned long indirection_page, unsigned long reboot_code_buffer, unsigned long start_address) ATTRIB_NORET; extern const unsigned char relocate_new_kernel[]; extern const unsigned int relocate_new_kernel_size; void machine_shutdown(void) { if (ppc_md.machine_shutdown) ppc_md.machine_shutdown(); } void machine_crash_shutdown(struct pt_regs *regs) { if (ppc_md.machine_crash_shutdown) ppc_md.machine_crash_shutdown(); } /* * 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) { if (ppc_md.machine_kexec_prepare) return ppc_md.machine_kexec_prepare(image); /* * Fail if platform doesn't provide its own machine_kexec_prepare * implementation. */ return -ENOSYS; } void machine_kexec_cleanup(struct kimage *image) { if (ppc_md.machine_kexec_cleanup) ppc_md.machine_kexec_cleanup(image); } /* * Do not allocate memory (or fail in any way) in machine_kexec(). * We are past the point of no return, committed to rebooting now. */ NORET_TYPE void machine_kexec(struct kimage *image) { if (ppc_md.machine_kexec) ppc_md.machine_kexec(image); else { /* * Fall back to normal restart if platform doesn't provide * its own kexec function, and user insist to kexec... */ machine_restart(NULL); } for(;;); } /* * This is a generic machine_kexec function suitable at least for * non-OpenFirmware embedded platforms. * It merely copies the image relocation code to the control page and * jumps to it. * A platform specific function may just call this one. */ void machine_kexec_simple(struct kimage *image) { unsigned long page_list; unsigned long reboot_code_buffer, reboot_code_buffer_phys; relocate_new_kernel_t rnk; /* 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); reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer); /* copy our kernel relocation code to the control code page */ memcpy((void *)reboot_code_buffer, relocate_new_kernel, relocate_new_kernel_size); flush_icache_range(reboot_code_buffer, reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE); printk(KERN_INFO "Bye!\n"); /* now call it */ rnk = (relocate_new_kernel_t) reboot_code_buffer; (*rnk)(page_list, reboot_code_buffer_phys, image->start); } |