include/asm-powerpc/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_CODE_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
  37 typedef 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  */
  46 static 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  */
 109 static inline void crash_setup_regs(struct pt_regs *newregs,
 110                                         struct pt_regs *oldregs) { }
 111 #endif /* !__powerpc64 __ */
 112
 113 extern void kexec_smp_wait(void);       /* get and clear naca physid, wait for
 114                                           master to copy new code to 0 */
 115 extern int crashing_cpu;
 116 extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
 117 extern cpumask_t cpus_in_sr;
 118 static inline int kexec_sr_activated(int cpu)
 119 {
 120         return cpu_isset(cpu,cpus_in_sr);
 121 }
 122
 123 struct kimage;
 124 struct pt_regs;
 125 extern void default_machine_kexec(struct kimage *image);
 126 extern int default_machine_kexec_prepare(struct kimage *image);
 127 extern void default_machine_crash_shutdown(struct pt_regs *regs);
 128 extern int crash_shutdown_register(crash_shutdown_t handler);
 129 extern int crash_shutdown_unregister(crash_shutdown_t handler);
 130
 131 extern void machine_kexec_simple(struct kimage *image);
 132 extern void crash_kexec_secondary(struct pt_regs *regs);
 133 extern int overlaps_crashkernel(unsigned long start, unsigned long size);
 134 extern void reserve_crashkernel(void);
 135
 136 #else /* !CONFIG_KEXEC */
 137 static inline int kexec_sr_activated(int cpu) { return 0; }
 138 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
 139
 140 static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
 141 {
 142         return 0;
 143 }
 144
 145 static inline void reserve_crashkernel(void) { ; }
 146
 147 static inline int crash_shutdown_register(crash_shutdown_t handler)
 148 {
 149         return 0;
 150 }
 151
 152 static 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 */