LXR linux/arch/powerpc/include/asm/kexec.h

   1#ifndef _ASM_POWERPC_KEXEC_H
   2#define _ASM_POWERPC_KEXEC_H
   3#ifdef __KERNEL__
   4
   5/*
   6 * Maximum page that is mapped directly into kernel memory.
   7 * XXX: Since we copy virt we can use any page we allocate
   8 */
   9#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  10
  11/*
  12 * Maximum address we can reach in physical address mode.
  13 * XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
  14 */
  15#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  16
  17/* Maximum address we can use for the control code buffer */
  18#ifdef __powerpc64__
  19#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
  20#else
  21/* TASK_SIZE, probably left over from use_mm ?? */
  22#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
  23#endif
  24
  25#define KEXEC_CONTROL_PAGE_SIZE 4096
  26
  27/* The native architecture */
  28#ifdef __powerpc64__
  29#define KEXEC_ARCH KEXEC_ARCH_PPC64
  30#else
  31#define KEXEC_ARCH KEXEC_ARCH_PPC
  32#endif
  33
  34#ifndef __ASSEMBLY__
  35#include <linux/cpumask.h>
  36
  37typedef void (*crash_shutdown_t)(void);
  38
  39#ifdef CONFIG_KEXEC
  40
  41#ifdef __powerpc64__
  42/*
  43 * This function is responsible for capturing register states if coming
  44 * via panic or invoking dump using sysrq-trigger.
  45 */
  46static inline void crash_setup_regs(struct pt_regs *newregs,
  47                                        struct pt_regs *oldregs)
  48{
  49        if (oldregs)
  50                memcpy(newregs, oldregs, sizeof(*newregs));
  51        else {
  52                /* FIXME Merge this with xmon_save_regs ?? */
  53                unsigned long tmp1, tmp2;
  54                __asm__ __volatile__ (
  55                        "std    0,0(%2)\n"
  56                        "std    1,8(%2)\n"
  57                        "std    2,16(%2)\n"
  58                        "std    3,24(%2)\n"
  59                        "std    4,32(%2)\n"
  60                        "std    5,40(%2)\n"
  61                        "std    6,48(%2)\n"
  62                        "std    7,56(%2)\n"
  63                        "std    8,64(%2)\n"
  64                        "std    9,72(%2)\n"
  65                        "std    10,80(%2)\n"
  66                        "std    11,88(%2)\n"
  67                        "std    12,96(%2)\n"
  68                        "std    13,104(%2)\n"
  69                        "std    14,112(%2)\n"
  70                        "std    15,120(%2)\n"
  71                        "std    16,128(%2)\n"
  72                        "std    17,136(%2)\n"
  73                        "std    18,144(%2)\n"
  74                        "std    19,152(%2)\n"
  75                        "std    20,160(%2)\n"
  76                        "std    21,168(%2)\n"
  77                        "std    22,176(%2)\n"
  78                        "std    23,184(%2)\n"
  79                        "std    24,192(%2)\n"
  80                        "std    25,200(%2)\n"
  81                        "std    26,208(%2)\n"
  82                        "std    27,216(%2)\n"
  83                        "std    28,224(%2)\n"
  84                        "std    29,232(%2)\n"
  85                        "std    30,240(%2)\n"
  86                        "std    31,248(%2)\n"
  87                        "mfmsr  %0\n"
  88                        "std    %0, 264(%2)\n"
  89                        "mfctr  %0\n"
  90                        "std    %0, 280(%2)\n"
  91                        "mflr   %0\n"
  92                        "std    %0, 288(%2)\n"
  93                        "bl     1f\n"
  94                "1:     mflr   %1\n"
  95                        "std    %1, 256(%2)\n"
  96                        "mtlr   %0\n"
  97                        "mfxer  %0\n"
  98                        "std    %0, 296(%2)\n"
  99                        : "=&r" (tmp1), "=&r" (tmp2)
 100                        : "b" (newregs)
 101                        : "memory");
 102        }
 103}
 104#else
 105/*
 106 * Provide a dummy definition to avoid build failures. Will remain
 107 * empty till crash dump support is enabled.
 108 */
 109static inline void crash_setup_regs(struct pt_regs *newregs,
 110                                        struct pt_regs *oldregs) { }
 111#endif /* !__powerpc64 __ */
 112
 113extern void kexec_smp_wait(void);       /* get and clear naca physid, wait for
 114                                          master to copy new code to 0 */
 115extern int crashing_cpu;
 116extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
 117extern cpumask_t cpus_in_sr;
 118static inline int kexec_sr_activated(int cpu)
 119{
 120        return cpu_isset(cpu,cpus_in_sr);
 121}
 122
 123struct kimage;
 124struct pt_regs;
 125extern void default_machine_kexec(struct kimage *image);
 126extern int default_machine_kexec_prepare(struct kimage *image);
 127extern void default_machine_crash_shutdown(struct pt_regs *regs);
 128extern int crash_shutdown_register(crash_shutdown_t handler);
 129extern int crash_shutdown_unregister(crash_shutdown_t handler);
 130
 131extern void machine_kexec_simple(struct kimage *image);
 132extern void crash_kexec_secondary(struct pt_regs *regs);
 133extern int overlaps_crashkernel(unsigned long start, unsigned long size);
 134extern void reserve_crashkernel(void);
 135
 136#else /* !CONFIG_KEXEC */
 137static inline int kexec_sr_activated(int cpu) { return 0; }
 138static inline void crash_kexec_secondary(struct pt_regs *regs) { }
 139
 140static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
 141{
 142        return 0;
 143}
 144
 145static inline void reserve_crashkernel(void) { ; }
 146
 147static inline int crash_shutdown_register(crash_shutdown_t handler)
 148{
 149        return 0;
 150}
 151
 152static inline int crash_shutdown_unregister(crash_shutdown_t handler)
 153{
 154        return 0;
 155}
 156
 157#endif /* CONFIG_KEXEC */
 158#endif /* ! __ASSEMBLY__ */
 159#endif /* __KERNEL__ */
 160#endif /* _ASM_POWERPC_KEXEC_H */
 161