bc75a24582
The following patch prevents the crash dump helper code found within kexec from breaking ppc which still lacks crash dump functionality. ksysfs crash_notes attribute handling was left under CONFIG_KEXEC for simplicity although it is not strictly kexec related. We provide here a dummy definition for crash_notes on ppc. Signed-off-by: Albert Herranz <albert_herranz@yahoo.es> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/*
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* machine_kexec.c - handle transition of Linux booting another kernel
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* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
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*
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* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <linux/mm.h>
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#include <linux/kexec.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/hw_irq.h>
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#include <asm/cacheflush.h>
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#include <asm/machdep.h>
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typedef NORET_TYPE void (*relocate_new_kernel_t)(
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unsigned long indirection_page,
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unsigned long reboot_code_buffer,
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unsigned long start_address) ATTRIB_NORET;
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const extern unsigned char relocate_new_kernel[];
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const extern unsigned int relocate_new_kernel_size;
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/*
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* Provide a dummy crash_notes definition while crash dump arrives to ppc.
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* This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
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*/
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void *crash_notes = NULL;
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void machine_shutdown(void)
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{
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if (ppc_md.machine_shutdown)
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ppc_md.machine_shutdown();
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}
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void machine_crash_shutdown(struct pt_regs *regs)
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{
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if (ppc_md.machine_crash_shutdown)
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ppc_md.machine_crash_shutdown();
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}
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/*
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* Do what every setup is needed on image and the
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* reboot code buffer to allow us to avoid allocations
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* later.
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*/
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int machine_kexec_prepare(struct kimage *image)
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{
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if (ppc_md.machine_kexec_prepare)
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return ppc_md.machine_kexec_prepare(image);
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/*
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* Fail if platform doesn't provide its own machine_kexec_prepare
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* implementation.
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*/
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return -ENOSYS;
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}
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void machine_kexec_cleanup(struct kimage *image)
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{
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if (ppc_md.machine_kexec_cleanup)
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ppc_md.machine_kexec_cleanup(image);
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}
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/*
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* Do not allocate memory (or fail in any way) in machine_kexec().
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* We are past the point of no return, committed to rebooting now.
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*/
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NORET_TYPE void machine_kexec(struct kimage *image)
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{
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if (ppc_md.machine_kexec)
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ppc_md.machine_kexec(image);
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else {
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/*
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* Fall back to normal restart if platform doesn't provide
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* its own kexec function, and user insist to kexec...
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*/
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machine_restart(NULL);
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}
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for(;;);
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}
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/*
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* This is a generic machine_kexec function suitable at least for
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* non-OpenFirmware embedded platforms.
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* It merely copies the image relocation code to the control page and
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* jumps to it.
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* A platform specific function may just call this one.
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*/
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void machine_kexec_simple(struct kimage *image)
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{
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unsigned long page_list;
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unsigned long reboot_code_buffer, reboot_code_buffer_phys;
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relocate_new_kernel_t rnk;
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/* Interrupts aren't acceptable while we reboot */
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local_irq_disable();
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page_list = image->head;
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/* we need both effective and real address here */
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reboot_code_buffer =
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(unsigned long)page_address(image->control_code_page);
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reboot_code_buffer_phys = virt_to_phys((void *)reboot_code_buffer);
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/* copy our kernel relocation code to the control code page */
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memcpy((void *)reboot_code_buffer, relocate_new_kernel,
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relocate_new_kernel_size);
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flush_icache_range(reboot_code_buffer,
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reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
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printk(KERN_INFO "Bye!\n");
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/* now call it */
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rnk = (relocate_new_kernel_t) reboot_code_buffer;
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(*rnk)(page_list, reboot_code_buffer_phys, image->start);
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}
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