arch/powerpc/include/asm/kexec.h

   1 #ifndef _ASM_POWERPC_KEXEC_H
   2 #define _ASM_POWERPC_KEXEC_H
   3 #ifdef __KERNEL__
   4
   5 #if defined(CONFIG_FSL_BOOKE) || defined(CONFIG_44x)
   6
   7 /*
   8  * On FSL-BookE we setup a 1:1 mapping which covers the first 2GiB of memory
   9  * and therefore we can only deal with memory within this range
  10  */
  11 #define KEXEC_SOURCE_MEMORY_LIMIT       (2 * 1024 * 1024 * 1024UL - 1)
  12 #define KEXEC_DESTINATION_MEMORY_LIMIT  (2 * 1024 * 1024 * 1024UL - 1)
  13 #define KEXEC_CONTROL_MEMORY_LIMIT      (2 * 1024 * 1024 * 1024UL - 1)
  14
  15 #else
  16
  17 /*
  18  * Maximum page that is mapped directly into kernel memory.
  19  * XXX: Since we copy virt we can use any page we allocate
  20  */
  21 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  22
  23 /*
  24  * Maximum address we can reach in physical address mode.
  25  * XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
  26  */
  27 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  28
  29 /* Maximum address we can use for the control code buffer */
  30 #ifdef __powerpc64__
  31 #define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
  32 #else
  33 /* TASK_SIZE, probably left over from use_mm ?? */
  34 #define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
  35 #endif
  36 #endif
  37
  38 #define KEXEC_CONTROL_PAGE_SIZE 4096
  39
  40 /* The native architecture */
  41 #ifdef __powerpc64__
  42 #define KEXEC_ARCH KEXEC_ARCH_PPC64
  43 #else
  44 #define KEXEC_ARCH KEXEC_ARCH_PPC
  45 #endif
  46
  47 #define KEXEC_STATE_NONE 0
  48 #define KEXEC_STATE_IRQS_OFF 1
  49 #define KEXEC_STATE_REAL_MODE 2
  50
  51 #ifndef __ASSEMBLY__
  52 #include <asm/reg.h>
  53
  54 typedef void (*crash_shutdown_t)(void);
  55
  56 #ifdef CONFIG_KEXEC
  57
  58 /*
  59  * This function is responsible for capturing register states if coming
  60  * via panic or invoking dump using sysrq-trigger.
  61  */
  62 static inline void crash_setup_regs(struct pt_regs *newregs,
  63                                         struct pt_regs *oldregs)
  64 {
  65         if (oldregs)
  66                 memcpy(newregs, oldregs, sizeof(*newregs));
  67         else
  68                 ppc_save_regs(newregs);
  69 }
  70
  71 extern void kexec_smp_wait(void);       /* get and clear naca physid, wait for
  72                                           master to copy new code to 0 */
  73 extern int crashing_cpu;
  74 extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
  75
  76 struct kimage;
  77 struct pt_regs;
  78 extern void default_machine_kexec(struct kimage *image);
  79 extern int default_machine_kexec_prepare(struct kimage *image);
  80 extern void default_machine_crash_shutdown(struct pt_regs *regs);
  81 extern int crash_shutdown_register(crash_shutdown_t handler);
  82 extern int crash_shutdown_unregister(crash_shutdown_t handler);
  83
  84 extern void crash_kexec_secondary(struct pt_regs *regs);
  85 extern int overlaps_crashkernel(unsigned long start, unsigned long size);
  86 extern void reserve_crashkernel(void);
  87 extern void machine_kexec_mask_interrupts(void);
  88
  89 static inline bool kdump_in_progress(void)
  90 {
  91         return crashing_cpu >= 0;
  92 }
  93
  94 #else /* !CONFIG_KEXEC */
  95 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
  96
  97 static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
  98 {
  99         return 0;
 100 }
 101
 102 static inline void reserve_crashkernel(void) { ; }
 103
 104 static inline int crash_shutdown_register(crash_shutdown_t handler)
 105 {
 106         return 0;
 107 }
 108
 109 static inline int crash_shutdown_unregister(crash_shutdown_t handler)
 110 {
 111         return 0;
 112 }
 113
 114 static inline bool kdump_in_progress(void)
 115 {
 116         return false;
 117 }
 118
 119 #endif /* CONFIG_KEXEC */
 120 #endif /* ! __ASSEMBLY__ */
 121 #endif /* __KERNEL__ */
 122 #endif /* _ASM_POWERPC_KEXEC_H */