| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _ASM_X86_OLPC_OFW_H |
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| 3 | #define _ASM_X86_OLPC_OFW_H |
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| 4 | |
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| 5 | /* index into the page table containing the entry OFW occupies */ |
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| 6 | #define OLPC_OFW_PDE_NR 1022 |
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| 7 | |
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| 8 | #define OLPC_OFW_SIG 0x2057464F /* aka "OFW " */ |
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| 9 | |
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| 10 | #ifdef CONFIG_OLPC |
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| 11 | |
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| 12 | extern bool olpc_ofw_is_installed(void); |
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| 13 | |
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| 14 | /* run an OFW command by calling into the firmware */ |
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| 15 | #define olpc_ofw(name, args, res) \ |
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| 16 | __olpc_ofw((name), ARRAY_SIZE(args), args, ARRAY_SIZE(res), res) |
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| 17 | |
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| 18 | extern int __olpc_ofw(const char *name, int nr_args, const void **args, int nr_res, |
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| 19 | void **res); |
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| 20 | |
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| 21 | /* determine whether OFW is available and lives in the proper memory */ |
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| 22 | extern void olpc_ofw_detect(void); |
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| 23 | |
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| 24 | /* install OFW's pde permanently into the kernel's pgtable */ |
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| 25 | extern void setup_olpc_ofw_pgd(void); |
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| 26 | |
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| 27 | /* check if OFW was detected during boot */ |
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| 28 | extern bool olpc_ofw_present(void); |
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| 29 | |
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| 30 | extern void olpc_dt_build_devicetree(void); |
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| 31 | |
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| 32 | #else /* !CONFIG_OLPC */ |
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| 33 | static inline void olpc_ofw_detect(void) { } |
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| 34 | static inline void setup_olpc_ofw_pgd(void) { } |
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| 35 | static inline void olpc_dt_build_devicetree(void) { } |
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| 36 | #endif /* !CONFIG_OLPC */ |
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| 37 | |
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| 38 | #endif /* _ASM_X86_OLPC_OFW_H */ |
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| 39 | |
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