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 */ 39