/* * 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 * LANDISK/sh4 supported by kogiidena * * 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/cacheflush.h> typedef NORET_TYPE void (*relocate_new_kernel_t)( unsigned long indirection_page, unsigned long reboot_code_buffer, unsigned long start_address, unsigned long vbr_reg) ATTRIB_NORET; extern const unsigned char relocate_new_kernel[]; extern const unsigned int relocate_new_kernel_size; extern void *gdb_vbr_vector; void machine_shutdown(void) { } void machine_crash_shutdown(struct pt_regs *regs) { } /* * 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) { return 0; } void machine_kexec_cleanup(struct kimage *image) { } static void kexec_info(struct kimage *image) { int i; printk("kexec information\n"); for (i = 0; i < image->nr_segments; i++) { printk(" segment[%d]: 0x%08x - 0x%08x (0x%08x)\n", i, (unsigned int)image->segment[i].mem, (unsigned int)image->segment[i].mem + image->segment[i].memsz, (unsigned int)image->segment[i].memsz); } printk(" start : 0x%08x\n\n", (unsigned int)image->start); } /* * 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) { unsigned long page_list; unsigned long reboot_code_buffer; unsigned long vbr_reg; relocate_new_kernel_t rnk; #if defined(CONFIG_SH_STANDARD_BIOS) vbr_reg = ((unsigned long )gdb_vbr_vector) - 0x100; #else vbr_reg = 0x80000000; // dummy #endif /* 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); /* copy our kernel relocation code to the control code page */ memcpy((void *)reboot_code_buffer, relocate_new_kernel, relocate_new_kernel_size); kexec_info(image); flush_cache_all(); /* now call it */ rnk = (relocate_new_kernel_t) reboot_code_buffer; (*rnk)(page_list, reboot_code_buffer, image->start, vbr_reg); }