arch/tile/include/asm/kexec.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  *
  14  * based on kexec.h from other architectures in linux-2.6.18
  15  */
  16
  17 #ifndef _ASM_TILE_KEXEC_H
  18 #define _ASM_TILE_KEXEC_H
  19
  20 #include <asm/page.h>
  21
  22 #ifndef __tilegx__
  23 /* Maximum physical address we can use pages from. */
  24 #define KEXEC_SOURCE_MEMORY_LIMIT TASK_SIZE
  25 /* Maximum address we can reach in physical address mode. */
  26 #define KEXEC_DESTINATION_MEMORY_LIMIT TASK_SIZE
  27 /* Maximum address we can use for the control code buffer. */
  28 #define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
  29 #else
  30 /* We need to limit the memory below PGDIR_SIZE since
  31  * we only setup page table for [0, PGDIR_SIZE) before final kexec.
  32  */
  33 /* Maximum physical address we can use pages from. */
  34 #define KEXEC_SOURCE_MEMORY_LIMIT PGDIR_SIZE
  35 /* Maximum address we can reach in physical address mode. */
  36 #define KEXEC_DESTINATION_MEMORY_LIMIT PGDIR_SIZE
  37 /* Maximum address we can use for the control code buffer. */
  38 #define KEXEC_CONTROL_MEMORY_LIMIT PGDIR_SIZE
  39 #endif
  40
  41 #define KEXEC_CONTROL_PAGE_SIZE PAGE_SIZE
  42
  43 /*
  44  * We don't bother to provide a unique identifier, since we can only
  45  * reboot with a single type of kernel image anyway.
  46  */
  47 #define KEXEC_ARCH KEXEC_ARCH_DEFAULT
  48
  49 /* Use the tile override for the page allocator. */
  50 struct page *kimage_alloc_pages_arch(gfp_t gfp_mask, unsigned int order);
  51 #define kimage_alloc_pages_arch kimage_alloc_pages_arch
  52
  53 #define MAX_NOTE_BYTES 1024
  54
  55 /* Defined in arch/tile/kernel/relocate_kernel.S */
  56 extern const unsigned char relocate_new_kernel[];
  57 extern const unsigned long relocate_new_kernel_size;
  58 extern void relocate_new_kernel_end(void);
  59
  60 /* Provide a dummy definition to avoid build failures. */
  61 static inline void crash_setup_regs(struct pt_regs *n, struct pt_regs *o)
  62 {
  63 }
  64
  65 #endif /* _ASM_TILE_KEXEC_H */