87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
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/*
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* include/asm-x86_64/crashdump.h
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*
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* Copyright (C) Hitachi, Ltd. 2004
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* Written by Satoshi Oshima (oshima@sdl.hitachi.co.jp)
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*
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* Derived from include/asm-i386/diskdump.h
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* Copyright (c) 2004 FUJITSU LIMITED
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* Copyright (c) 2003 Red Hat, Inc. All rights reserved.
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*
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*/
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#ifndef _ASM_X86_64_CRASHDUMP_H
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#define _ASM_X86_64_CRASHDUMP_H
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#ifdef __KERNEL__
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#include <linux/elf.h>
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extern int page_is_ram(unsigned long);
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extern unsigned long next_ram_page(unsigned long);
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#define platform_fix_regs() \
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{ \
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unsigned long rsp; \
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unsigned short ss; \
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rsp = (unsigned long) ((char *)regs + sizeof (struct pt_regs)); \
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ss = __KERNEL_DS; \
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if (regs->cs & 3) { \
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rsp = regs->rsp; \
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ss = regs->ss & 0xffff; \
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} \
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myregs = *regs; \
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myregs.rsp = rsp; \
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myregs.ss = (myregs.ss & (~0xffff)) | ss; \
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}
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#define platform_timestamp(x) rdtscll(x)
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#define platform_freeze_cpu() \
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{ \
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for (;;) local_irq_disable(); \
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}
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static inline void platform_init_stack(void **stackptr)
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{
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struct page *page;
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if ((page = alloc_page(GFP_KERNEL)))
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*stackptr = (void *)page_address(page);
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if (*stackptr)
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memset(*stackptr, 0, PAGE_SIZE);
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else
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printk(KERN_WARNING
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"crashdump: unable to allocate separate stack\n");
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}
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#define platform_cleanup_stack(stackptr) \
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do { \
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if (stackptr) \
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free_page((unsigned long)stackptr); \
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} while (0)
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typedef asmlinkage void (*crashdump_func_t)(struct pt_regs *, void *);
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static inline void platform_start_crashdump(void *stackptr,
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crashdump_func_t dumpfunc,
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struct pt_regs *regs)
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{
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static unsigned long old_rsp;
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unsigned long new_rsp;
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if (stackptr) {
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asm volatile("movq %%rsp,%0" : "=r" (old_rsp));
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new_rsp = (unsigned long)stackptr + PAGE_SIZE;
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asm volatile("movq %0,%%rsp" :: "r" (new_rsp));
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dumpfunc(regs, NULL);
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asm volatile("movq %0,%%rsp" :: "r" (old_rsp));
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} else
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dumpfunc(regs, NULL);
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}
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_64_CRASHDUMP_H */
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