xref: /openbmc/linux/arch/x86/include/asm/olpc_ofw.h (revision b2441318)
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 */
olpc_ofw_detect(void)33 static inline void olpc_ofw_detect(void) { }
setup_olpc_ofw_pgd(void)34 static inline void setup_olpc_ofw_pgd(void) { }
olpc_dt_build_devicetree(void)35 static inline void olpc_dt_build_devicetree(void) { }
36 #endif /* !CONFIG_OLPC */
37 
38 #endif /* _ASM_X86_OLPC_OFW_H */
39