olpc_ofw.h (1128B)
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 12extern 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 18extern 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 */ 22extern void olpc_ofw_detect(void); 23 24/* install OFW's pde permanently into the kernel's pgtable */ 25extern void setup_olpc_ofw_pgd(void); 26 27/* check if OFW was detected during boot */ 28extern bool olpc_ofw_present(void); 29 30extern void olpc_dt_build_devicetree(void); 31 32#else /* !CONFIG_OLPC */ 33static inline void olpc_ofw_detect(void) { } 34static inline void setup_olpc_ofw_pgd(void) { } 35static inline void olpc_dt_build_devicetree(void) { } 36#endif /* !CONFIG_OLPC */ 37 38#endif /* _ASM_X86_OLPC_OFW_H */