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c1caae3de4
In LE kernel, we currently have a hack for kexec that resets the exception endian before starting a new kernel as the kernel that is loaded could be a big endian or a little endian kernel. In kdump case, resetting exception endian fails when one or more cpus is disabled. But we can ignore the failure and still go ahead, as in most cases crashkernel will be of same endianess as primary kernel and reseting endianess is not even needed in those cases. This patch adds a new inline function to say if this is kdump path. This function is used at places where such a check is needed. Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com> [mpe: Rename to kdump_in_progress(), use bool, and edit comment] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
123 lines
3.1 KiB
C
123 lines
3.1 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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#if defined(CONFIG_FSL_BOOKE) || defined(CONFIG_44x)
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/*
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* On FSL-BookE we setup a 1:1 mapping which covers the first 2GiB of memory
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* and therefore we can only deal with memory within this range
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*/
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#define KEXEC_SOURCE_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL - 1)
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#define KEXEC_DESTINATION_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL - 1)
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#define KEXEC_CONTROL_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL - 1)
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#else
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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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#endif
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#define KEXEC_CONTROL_PAGE_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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#define KEXEC_STATE_NONE 0
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#define KEXEC_STATE_IRQS_OFF 1
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#define KEXEC_STATE_REAL_MODE 2
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#ifndef __ASSEMBLY__
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#include <asm/reg.h>
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typedef void (*crash_shutdown_t)(void);
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#ifdef CONFIG_KEXEC
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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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ppc_save_regs(newregs);
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}
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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 int crashing_cpu;
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extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
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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 int crash_shutdown_register(crash_shutdown_t handler);
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extern int crash_shutdown_unregister(crash_shutdown_t handler);
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extern void crash_kexec_secondary(struct pt_regs *regs);
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extern int overlaps_crashkernel(unsigned long start, unsigned long size);
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extern void reserve_crashkernel(void);
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extern void machine_kexec_mask_interrupts(void);
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static inline bool kdump_in_progress(void)
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{
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return crashing_cpu >= 0;
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}
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#else /* !CONFIG_KEXEC */
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static inline void crash_kexec_secondary(struct pt_regs *regs) { }
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static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
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{
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return 0;
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}
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static inline void reserve_crashkernel(void) { ; }
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static inline int crash_shutdown_register(crash_shutdown_t handler)
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{
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return 0;
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}
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static inline int crash_shutdown_unregister(crash_shutdown_t handler)
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{
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return 0;
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}
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static inline bool kdump_in_progress(void)
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{
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return false;
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}
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#endif /* CONFIG_KEXEC */
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#endif /* ! __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_KEXEC_H */
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