/* * machine_kexec.c - handle transition of Linux booting another kernel * Copyright (C) 2002-2003 Eric Biederman * * 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 #include #include #include #include #include #include #include #include #include #include typedef NORET_TYPE void (*relocate_new_kernel_t)( unsigned long indirection_page, unsigned long reboot_code_buffer, unsigned long start_address) ATTRIB_NORET; const extern unsigned char relocate_new_kernel[]; const extern 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); }