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_CORE
  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 #ifdef CONFIG_KEXEC_FILE
  95 extern struct kexec_file_ops kexec_elf64_ops;
  96
  97 #ifdef CONFIG_IMA_KEXEC
  98 #define ARCH_HAS_KIMAGE_ARCH
  99
 100 struct kimage_arch {
 101         phys_addr_t ima_buffer_addr;
 102         size_t ima_buffer_size;
 103 };
 104 #endif
 105
 106 int setup_purgatory(struct kimage *image, const void *slave_code,
 107                     const void *fdt, unsigned long kernel_load_addr,
 108                     unsigned long fdt_load_addr);
 109 int setup_new_fdt(const struct kimage *image, void *fdt,
 110                   unsigned long initrd_load_addr, unsigned long initrd_len,
 111                   const char *cmdline);
 112 int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 113 #endif /* CONFIG_KEXEC_FILE */
 114
 115 #else /* !CONFIG_KEXEC_CORE */
 116 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
 117
 118 static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
 119 {
 120         return 0;
 121 }
 122
 123 static inline void reserve_crashkernel(void) { ; }
 124
 125 static inline int crash_shutdown_register(crash_shutdown_t handler)
 126 {
 127         return 0;
 128 }
 129
 130 static inline int crash_shutdown_unregister(crash_shutdown_t handler)
 131 {
 132         return 0;
 133 }
 134
 135 static inline bool kdump_in_progress(void)
 136 {
 137         return false;
 138 }
 139
 140 #endif /* CONFIG_KEXEC_CORE */
 141 #endif /* ! __ASSEMBLY__ */
 142 #endif /* __KERNEL__ */
 143 #endif /* _ASM_POWERPC_KEXEC_H */