118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
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* Code to handle transition of Linux booting another kernel.
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*
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* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
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* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
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* Copyright (C) 2005 IBM Corporation.
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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/kexec.h>
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#include <linux/reboot.h>
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#include <linux/threads.h>
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#include <asm/machdep.h>
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#include <asm/lmb.h>
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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(regs);
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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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static int __init early_parse_crashk(char *p)
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{
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unsigned long size;
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if (!p)
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return 1;
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size = memparse(p, &p);
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if (*p == '@')
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crashk_res.start = memparse(p + 1, &p);
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else
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crashk_res.start = KDUMP_KERNELBASE;
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crashk_res.end = crashk_res.start + size - 1;
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return 0;
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}
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early_param("crashkernel", early_parse_crashk);
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void __init reserve_crashkernel(void)
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{
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unsigned long size;
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if (crashk_res.start == 0)
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return;
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/* We might have got these values via the command line or the
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* device tree, either way sanitise them now. */
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size = crashk_res.end - crashk_res.start + 1;
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if (crashk_res.start != KDUMP_KERNELBASE)
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printk("Crash kernel location must be 0x%x\n",
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KDUMP_KERNELBASE);
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crashk_res.start = KDUMP_KERNELBASE;
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size = PAGE_ALIGN(size);
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crashk_res.end = crashk_res.start + size - 1;
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/* Crash kernel trumps memory limit */
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if (memory_limit && memory_limit <= crashk_res.end) {
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memory_limit = crashk_res.end + 1;
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printk("Adjusted memory limit for crashkernel, now 0x%lx\n",
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memory_limit);
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}
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lmb_reserve(crashk_res.start, size);
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}
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int overlaps_crashkernel(unsigned long start, unsigned long size)
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{
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return (start + size) > crashk_res.start && start <= crashk_res.end;
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}
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