mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c10d1e260f
Make use of PROC_DEVICETREE to export the tree, and sparc's PROMTREE code to
call into OLPC's Open Firmware to build the tree.
v5: fix buglet with root node check (introduced in v4)
v4: address some minor style issues pointed out by Grant, and explicitly cast
negative phandle checks to s32.
v3: rename olpc_prom to olpc_dt
- rework Kconfig entries
- drop devtree build hook from proc, instead adding a call to x86's
paging_init (similarly to how sparc64 does it)
- switch allocation from using slab to alloc_bootmem. this allows
the DT to be built earlier during boot (during setup_arch); the
downside is that there are some 1200 bootmem reservations that are
done during boot. Not ideal..
- add a helper olpc_ofw_is_installed function to test for the
existence and successful detection of OLPC's OFW.
Signed-off-by: Andres Salomon <dilinger@queued.net>
LKML-Reference: <20101116220952.26526a80@queued.net>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
#ifndef _ASM_X86_OLPC_OFW_H
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#define _ASM_X86_OLPC_OFW_H
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/* index into the page table containing the entry OFW occupies */
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#define OLPC_OFW_PDE_NR 1022
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#define OLPC_OFW_SIG 0x2057464F /* aka "OFW " */
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#ifdef CONFIG_OLPC_OPENFIRMWARE
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extern bool olpc_ofw_is_installed(void);
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/* run an OFW command by calling into the firmware */
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#define olpc_ofw(name, args, res) \
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__olpc_ofw((name), ARRAY_SIZE(args), args, ARRAY_SIZE(res), res)
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extern int __olpc_ofw(const char *name, int nr_args, const void **args, int nr_res,
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void **res);
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/* determine whether OFW is available and lives in the proper memory */
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extern void olpc_ofw_detect(void);
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/* install OFW's pde permanently into the kernel's pgtable */
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extern void setup_olpc_ofw_pgd(void);
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/* check if OFW was detected during boot */
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extern bool olpc_ofw_present(void);
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#else /* !CONFIG_OLPC_OPENFIRMWARE */
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static inline bool olpc_ofw_is_installed(void) { return false; }
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static inline void olpc_ofw_detect(void) { }
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static inline void setup_olpc_ofw_pgd(void) { }
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static inline bool olpc_ofw_present(void) { return false; }
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#endif /* !CONFIG_OLPC_OPENFIRMWARE */
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#ifdef CONFIG_OLPC_OPENFIRMWARE_DT
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extern void olpc_dt_build_devicetree(void);
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#else
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static inline void olpc_dt_build_devicetree(void) { }
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#endif /* CONFIG_OLPC_OPENFIRMWARE_DT */
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#endif /* _ASM_X86_OLPC_OFW_H */
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