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
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