arch/powerpc/include/asm/kexec.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_KEXEC_H
   3 #define _ASM_POWERPC_KEXEC_H
   4 #ifdef __KERNEL__
   5
   6 #if defined(CONFIG_FSL_BOOKE) || defined(CONFIG_44x)
   7
   8 /*
   9  * On FSL-BookE we setup a 1:1 mapping which covers the first 2GiB of memory
  10  * and therefore we can only deal with memory within this range
  11  */
  12 #define KEXEC_SOURCE_MEMORY_LIMIT       (2 * 1024 * 1024 * 1024UL - 1)
  13 #define KEXEC_DESTINATION_MEMORY_LIMIT  (2 * 1024 * 1024 * 1024UL - 1)
  14 #define KEXEC_CONTROL_MEMORY_LIMIT      (2 * 1024 * 1024 * 1024UL - 1)
  15
  16 #else
  17
  18 /*
  19  * Maximum page that is mapped directly into kernel memory.
  20  * XXX: Since we copy virt we can use any page we allocate
  21  */
  22 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  23
  24 /*
  25  * Maximum address we can reach in physical address mode.
  26  * XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
  27  */
  28 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  29
  30 /* Maximum address we can use for the control code buffer */
  31 #ifdef __powerpc64__
  32 #define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
  33 #else
  34 /* TASK_SIZE, probably left over from use_mm ?? */
  35 #define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
  36 #endif
  37 #endif
  38
  39 #define KEXEC_CONTROL_PAGE_SIZE 4096
  40
  41 /* The native architecture */
  42 #ifdef __powerpc64__
  43 #define KEXEC_ARCH KEXEC_ARCH_PPC64
  44 #else
  45 #define KEXEC_ARCH KEXEC_ARCH_PPC
  46 #endif
  47
  48 #define KEXEC_STATE_NONE 0
  49 #define KEXEC_STATE_IRQS_OFF 1
  50 #define KEXEC_STATE_REAL_MODE 2
  51
  52 #ifndef __ASSEMBLY__
  53 #include <asm/reg.h>
  54
  55 typedef void (*crash_shutdown_t)(void);
  56
  57 #ifdef CONFIG_KEXEC_CORE
  58
  59 /*
  60  * This function is responsible for capturing register states if coming
  61  * via panic or invoking dump using sysrq-trigger.
  62  */
  63 static inline void crash_setup_regs(struct pt_regs *newregs,
  64                                         struct pt_regs *oldregs)
  65 {
  66         if (oldregs)
  67                 memcpy(newregs, oldregs, sizeof(*newregs));
  68         else
  69                 ppc_save_regs(newregs);
  70 }
  71
  72 extern void kexec_smp_wait(void);       /* get and clear naca physid, wait for
  73                                           master to copy new code to 0 */
  74 extern int crashing_cpu;
  75 extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
  76 extern void crash_ipi_callback(struct pt_regs *);
  77 extern int crash_wake_offline;
  78
  79 struct kimage;
  80 struct pt_regs;
  81 extern void default_machine_kexec(struct kimage *image);
  82 extern int default_machine_kexec_prepare(struct kimage *image);
  83 extern void default_machine_crash_shutdown(struct pt_regs *regs);
  84 extern int crash_shutdown_register(crash_shutdown_t handler);
  85 extern int crash_shutdown_unregister(crash_shutdown_t handler);
  86
  87 extern void crash_kexec_secondary(struct pt_regs *regs);
  88 extern int overlaps_crashkernel(unsigned long start, unsigned long size);
  89 extern void reserve_crashkernel(void);
  90 extern void machine_kexec_mask_interrupts(void);
  91
  92 static inline bool kdump_in_progress(void)
  93 {
  94         return crashing_cpu >= 0;
  95 }
  96
  97 void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
  98                          unsigned long start_address) __noreturn;
  99
 100 #ifdef CONFIG_KEXEC_FILE
 101 extern const struct kexec_file_ops kexec_elf64_ops;
 102
 103 #ifdef CONFIG_IMA_KEXEC
 104 #define ARCH_HAS_KIMAGE_ARCH
 105
 106 struct kimage_arch {
 107         phys_addr_t ima_buffer_addr;
 108         size_t ima_buffer_size;
 109 };
 110 #endif
 111
 112 int setup_purgatory(struct kimage *image, const void *slave_code,
 113                     const void *fdt, unsigned long kernel_load_addr,
 114                     unsigned long fdt_load_addr);
 115 int setup_new_fdt(const struct kimage *image, void *fdt,
 116                   unsigned long initrd_load_addr, unsigned long initrd_len,
 117                   const char *cmdline);
 118 int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 119 #endif /* CONFIG_KEXEC_FILE */
 120
 121 #else /* !CONFIG_KEXEC_CORE */
 122 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
 123
 124 static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
 125 {
 126         return 0;
 127 }
 128
 129 static inline void reserve_crashkernel(void) { ; }
 130
 131 static inline int crash_shutdown_register(crash_shutdown_t handler)
 132 {
 133         return 0;
 134 }
 135
 136 static inline int crash_shutdown_unregister(crash_shutdown_t handler)
 137 {
 138         return 0;
 139 }
 140
 141 static inline bool kdump_in_progress(void)
 142 {
 143         return false;
 144 }
 145
 146 static inline void crash_ipi_callback(struct pt_regs *regs) { }
 147
 148 static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
 149 {
 150 }
 151
 152 #endif /* CONFIG_KEXEC_CORE */
 153 #endif /* ! __ASSEMBLY__ */
 154 #endif /* __KERNEL__ */
 155 #endif /* _ASM_POWERPC_KEXEC_H */