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 /*
  15  * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
  16  * I.e. Maximum page that is mapped directly into kernel memory,
  17  * and kmap is not required.
  18  */
  19
  20 /* Maximum physical address we can use pages from */
  21 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  22
  23 /* Maximum address we can reach in physical address mode */
  24 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  25
  26 /* Maximum address we can use for the control pages */
  27 /* Not more than 2GB */
  28 #define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
  29
  30 /* Allocate control page with GFP_DMA */
  31 #define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
  32
  33 /* Maximum address we can use for the crash control pages */
  34 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
  35
  36 /* Allocate one page for the pdp and the second for the code */
  37 #define KEXEC_CONTROL_PAGE_SIZE 4096
  38
  39 /* Alignment of crashkernel memory */
  40 #define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
  41
  42 /* The native architecture */
  43 #define KEXEC_ARCH KEXEC_ARCH_S390
  44
  45 /* Provide a dummy definition to avoid build failures. */
  46 static inline void crash_setup_regs(struct pt_regs *newregs,
  47                                         struct pt_regs *oldregs) { }
  48
  49 #endif /*_S390_KEXEC_H */