linux/arch/powerpc/include/asm/kexec.h
Anton Vorontsov 02af87a742 powerpc/kdump: Use ppc_save_regs() in crash_setup_regs()
The patch replaces internal registers dump implementation with
ppc_save_regs(). From now on PPC64 and PPC32 are using the same
code for crash_setup_regs().

NOTE: The old regs dump implementation was capturing SP (r1) directly
as is, so you could see crash_kexec() function on top of the back-trace.
But ppc_save_regs() goes up one stack frame, so you'll not see it
anymore, at the top-level you'll see who actually triggered the crash
dump instead.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-08 16:25:17 +11:00

103 lines
2.7 KiB
C

#ifndef _ASM_POWERPC_KEXEC_H
#define _ASM_POWERPC_KEXEC_H
#ifdef __KERNEL__
/*
* Maximum page that is mapped directly into kernel memory.
* XXX: Since we copy virt we can use any page we allocate
*/
#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
/*
* Maximum address we can reach in physical address mode.
* XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
*/
#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
/* Maximum address we can use for the control code buffer */
#ifdef __powerpc64__
#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
#else
/* TASK_SIZE, probably left over from use_mm ?? */
#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
#endif
#define KEXEC_CONTROL_PAGE_SIZE 4096
/* The native architecture */
#ifdef __powerpc64__
#define KEXEC_ARCH KEXEC_ARCH_PPC64
#else
#define KEXEC_ARCH KEXEC_ARCH_PPC
#endif
#ifndef __ASSEMBLY__
#include <linux/cpumask.h>
#include <asm/reg.h>
typedef void (*crash_shutdown_t)(void);
#ifdef CONFIG_KEXEC
/*
* This function is responsible for capturing register states if coming
* via panic or invoking dump using sysrq-trigger.
*/
static inline void crash_setup_regs(struct pt_regs *newregs,
struct pt_regs *oldregs)
{
if (oldregs)
memcpy(newregs, oldregs, sizeof(*newregs));
else
ppc_save_regs(newregs);
}
extern void kexec_smp_wait(void); /* get and clear naca physid, wait for
master to copy new code to 0 */
extern int crashing_cpu;
extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
extern cpumask_t cpus_in_sr;
static inline int kexec_sr_activated(int cpu)
{
return cpu_isset(cpu,cpus_in_sr);
}
struct kimage;
struct pt_regs;
extern void default_machine_kexec(struct kimage *image);
extern int default_machine_kexec_prepare(struct kimage *image);
extern void default_machine_crash_shutdown(struct pt_regs *regs);
extern int crash_shutdown_register(crash_shutdown_t handler);
extern int crash_shutdown_unregister(crash_shutdown_t handler);
extern void machine_kexec_simple(struct kimage *image);
extern void crash_kexec_secondary(struct pt_regs *regs);
extern int overlaps_crashkernel(unsigned long start, unsigned long size);
extern void reserve_crashkernel(void);
#else /* !CONFIG_KEXEC */
static inline int kexec_sr_activated(int cpu) { return 0; }
static inline void crash_kexec_secondary(struct pt_regs *regs) { }
static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
{
return 0;
}
static inline void reserve_crashkernel(void) { ; }
static inline int crash_shutdown_register(crash_shutdown_t handler)
{
return 0;
}
static inline int crash_shutdown_unregister(crash_shutdown_t handler)
{
return 0;
}
#endif /* CONFIG_KEXEC */
#endif /* ! __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_KEXEC_H */