2ec5e3a867
While testing kexec and kdump we hit problems where the new kernel would freeze or instantly reboot. The easiest way to trigger it was to kexec a kernel compiled for CONFIG_M586 on an athlon cpu. Compiling for CONFIG_MK7 instead would work fine. The patch fixes a few problems with the kexec inline asm. Signed-off-by: Chris Mason <mason@suse.com> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
#ifndef _ASM_POWERPC_KEXEC_H
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#define _ASM_POWERPC_KEXEC_H
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#ifdef __KERNEL__
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/*
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* Maximum page that is mapped directly into kernel memory.
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* XXX: Since we copy virt we can use any page we allocate
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*/
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#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
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/*
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* Maximum address we can reach in physical address mode.
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* XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
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*/
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#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
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/* Maximum address we can use for the control code buffer */
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#ifdef __powerpc64__
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#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
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#else
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/* TASK_SIZE, probably left over from use_mm ?? */
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#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
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#endif
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#define KEXEC_CONTROL_CODE_SIZE 4096
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/* The native architecture */
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#ifdef __powerpc64__
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#define KEXEC_ARCH KEXEC_ARCH_PPC64
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#else
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#define KEXEC_ARCH KEXEC_ARCH_PPC
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#endif
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#ifdef CONFIG_KEXEC
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#ifndef __ASSEMBLY__
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#ifdef __powerpc64__
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/*
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* This function is responsible for capturing register states if coming
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* via panic or invoking dump using sysrq-trigger.
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*/
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs)
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{
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if (oldregs)
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memcpy(newregs, oldregs, sizeof(*newregs));
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else {
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/* FIXME Merge this with xmon_save_regs ?? */
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unsigned long tmp1, tmp2;
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__asm__ __volatile__ (
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"std 0,0(%2)\n"
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"std 1,8(%2)\n"
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"std 2,16(%2)\n"
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"std 3,24(%2)\n"
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"std 4,32(%2)\n"
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"std 5,40(%2)\n"
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"std 6,48(%2)\n"
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"std 7,56(%2)\n"
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"std 8,64(%2)\n"
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"std 9,72(%2)\n"
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"std 10,80(%2)\n"
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"std 11,88(%2)\n"
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"std 12,96(%2)\n"
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"std 13,104(%2)\n"
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"std 14,112(%2)\n"
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"std 15,120(%2)\n"
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"std 16,128(%2)\n"
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"std 17,136(%2)\n"
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"std 18,144(%2)\n"
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"std 19,152(%2)\n"
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"std 20,160(%2)\n"
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"std 21,168(%2)\n"
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"std 22,176(%2)\n"
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"std 23,184(%2)\n"
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"std 24,192(%2)\n"
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"std 25,200(%2)\n"
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"std 26,208(%2)\n"
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"std 27,216(%2)\n"
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"std 28,224(%2)\n"
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"std 29,232(%2)\n"
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"std 30,240(%2)\n"
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"std 31,248(%2)\n"
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"mfmsr %0\n"
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"std %0, 264(%2)\n"
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"mfctr %0\n"
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"std %0, 280(%2)\n"
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"mflr %0\n"
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"std %0, 288(%2)\n"
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"bl 1f\n"
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"1: mflr %1\n"
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"std %1, 256(%2)\n"
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"mtlr %0\n"
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"mfxer %0\n"
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"std %0, 296(%2)\n"
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: "=&r" (tmp1), "=&r" (tmp2)
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: "b" (newregs)
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: "memory");
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}
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}
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#else
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/*
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* Provide a dummy definition to avoid build failures. Will remain
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* empty till crash dump support is enabled.
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*/
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs) { }
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#endif /* !__powerpc64 __ */
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#define MAX_NOTE_BYTES 1024
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#ifdef __powerpc64__
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extern void kexec_smp_wait(void); /* get and clear naca physid, wait for
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master to copy new code to 0 */
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extern void __init kexec_setup(void);
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extern int crashing_cpu;
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extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
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#endif /* __powerpc64 __ */
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struct kimage;
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struct pt_regs;
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extern void default_machine_kexec(struct kimage *image);
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extern int default_machine_kexec_prepare(struct kimage *image);
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extern void default_machine_crash_shutdown(struct pt_regs *regs);
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extern void machine_kexec_simple(struct kimage *image);
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#endif /* ! __ASSEMBLY__ */
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#endif /* CONFIG_KEXEC */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_KEXEC_H */
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