arch/x86/include/asm/olpc_ofw.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_OLPC_OFW_H
   3 #define _ASM_X86_OLPC_OFW_H
   4
   5 /* index into the page table containing the entry OFW occupies */
   6 #define OLPC_OFW_PDE_NR 1022
   7
   8 #define OLPC_OFW_SIG 0x2057464F /* aka "OFW " */
   9
  10 #ifdef CONFIG_OLPC
  11
  12 extern bool olpc_ofw_is_installed(void);
  13
  14 /* run an OFW command by calling into the firmware */
  15 #define olpc_ofw(name, args, res) \
  16         __olpc_ofw((name), ARRAY_SIZE(args), args, ARRAY_SIZE(res), res)
  17
  18 extern int __olpc_ofw(const char *name, int nr_args, const void **args, int nr_res,
  19                 void **res);
  20
  21 /* determine whether OFW is available and lives in the proper memory */
  22 extern void olpc_ofw_detect(void);
  23
  24 /* install OFW's pde permanently into the kernel's pgtable */
  25 extern void setup_olpc_ofw_pgd(void);
  26
  27 /* check if OFW was detected during boot */
  28 extern bool olpc_ofw_present(void);
  29
  30 extern void olpc_dt_build_devicetree(void);
  31
  32 #else /* !CONFIG_OLPC */
  33 static inline void olpc_ofw_detect(void) { }
  34 static inline void setup_olpc_ofw_pgd(void) { }
  35 static inline void olpc_dt_build_devicetree(void) { }
  36 #endif /* !CONFIG_OLPC */
  37
  38 #endif /* _ASM_X86_OLPC_OFW_H */