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 #include <asm/reg.h>
  37
  38 typedef void (*crash_shutdown_t)(void);
  39
  40 #ifdef CONFIG_KEXEC
  41
  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                 ppc_save_regs(newregs);
  53 }
  54
  55 extern void kexec_smp_wait(void);       /* get and clear naca physid, wait for
  56                                           master to copy new code to 0 */
  57 extern int crashing_cpu;
  58 extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
  59 extern cpumask_t cpus_in_sr;
  60 static inline int kexec_sr_activated(int cpu)
  61 {
  62         return cpu_isset(cpu,cpus_in_sr);
  63 }
  64
  65 struct kimage;
  66 struct pt_regs;
  67 extern void default_machine_kexec(struct kimage *image);
  68 extern int default_machine_kexec_prepare(struct kimage *image);
  69 extern void default_machine_crash_shutdown(struct pt_regs *regs);
  70 extern int crash_shutdown_register(crash_shutdown_t handler);
  71 extern int crash_shutdown_unregister(crash_shutdown_t handler);
  72
  73 extern void machine_kexec_simple(struct kimage *image);
  74 extern void crash_kexec_secondary(struct pt_regs *regs);
  75 extern int overlaps_crashkernel(unsigned long start, unsigned long size);
  76 extern void reserve_crashkernel(void);
  77
  78 #else /* !CONFIG_KEXEC */
  79 static inline int kexec_sr_activated(int cpu) { return 0; }
  80 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
  81
  82 static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
  83 {
  84         return 0;
  85 }
  86
  87 static inline void reserve_crashkernel(void) { ; }
  88
  89 static inline int crash_shutdown_register(crash_shutdown_t handler)
  90 {
  91         return 0;
  92 }
  93
  94 static inline int crash_shutdown_unregister(crash_shutdown_t handler)
  95 {
  96         return 0;
  97 }
  98
  99 #endif /* CONFIG_KEXEC */
 100 #endif /* ! __ASSEMBLY__ */
 101 #endif /* __KERNEL__ */
 102 #endif /* _ASM_POWERPC_KEXEC_H */