arch/s390/include/asm/kexec.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright IBM Corp. 2005
   4  *
   5  * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
   6  *
   7  */
   8
   9 #ifndef _S390_KEXEC_H
  10 #define _S390_KEXEC_H
  11
  12 #include <asm/processor.h>
  13 #include <asm/page.h>
  14 #include <asm/setup.h>
  15 /*
  16  * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
  17  * I.e. Maximum page that is mapped directly into kernel memory,
  18  * and kmap is not required.
  19  */
  20
  21 /* Maximum physical address we can use pages from */
  22 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  23
  24 /* Maximum address we can reach in physical address mode */
  25 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  26
  27 /* Maximum address we can use for the control pages */
  28 /* Not more than 2GB */
  29 #define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
  30
  31 /* Allocate control page with GFP_DMA */
  32 #define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
  33
  34 /* Maximum address we can use for the crash control pages */
  35 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
  36
  37 /* Allocate one page for the pdp and the second for the code */
  38 #define KEXEC_CONTROL_PAGE_SIZE 4096
  39
  40 /* Alignment of crashkernel memory */
  41 #define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
  42
  43 /* The native architecture */
  44 #define KEXEC_ARCH KEXEC_ARCH_S390
  45
  46 /* Allow kexec_file to load a segment to 0 */
  47 #define KEXEC_BUF_MEM_UNKNOWN -1
  48
  49 /* Provide a dummy definition to avoid build failures. */
  50 static inline void crash_setup_regs(struct pt_regs *newregs,
  51                                         struct pt_regs *oldregs) { }
  52
  53 struct kimage;
  54 struct s390_load_data {
  55         /* Pointer to the kernel buffer. Used to register cmdline etc.. */
  56         void *kernel_buf;
  57
  58         /* Load address of the kernel_buf. */
  59         unsigned long kernel_mem;
  60
  61         /* Parmarea in the kernel buffer. */
  62         struct parmarea *parm;
  63
  64         /* Total size of loaded segments in memory. Used as an offset. */
  65         size_t memsz;
  66
  67         struct ipl_report *report;
  68 };
  69
  70 int s390_verify_sig(const char *kernel, unsigned long kernel_len);
  71 void *kexec_file_add_components(struct kimage *image,
  72                                 int (*add_kernel)(struct kimage *image,
  73                                                   struct s390_load_data *data));
  74 int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,
  75                          unsigned long addr);
  76
  77 extern const struct kexec_file_ops s390_kexec_image_ops;
  78 extern const struct kexec_file_ops s390_kexec_elf_ops;
  79
  80 #endif /*_S390_KEXEC_H */