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 */
39