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In preparation for the following patch which will fix an issue on the 8xx by re-using the 'slices', this patch enhances the 'slices' implementation to support 32 bits CPUs. On PPC32, the address space is limited to 4Gbytes, hence only the low slices will be used. The high slices use bitmaps. As bitmap functions are not prepared to handle bitmaps of size 0, this patch ensures that bitmap functions are called only when SLICE_NUM_HIGH is not nul. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_SLICE_H
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#define _ASM_POWERPC_SLICE_H
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#ifdef CONFIG_PPC_BOOK3S_64
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#include <asm/book3s/64/slice.h>
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#elif defined(CONFIG_PPC64)
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#include <asm/nohash/64/slice.h>
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#elif defined(CONFIG_PPC_MMU_NOHASH)
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#include <asm/nohash/32/slice.h>
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#endif
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#ifdef CONFIG_PPC_MM_SLICES
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#ifdef CONFIG_HUGETLB_PAGE
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#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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#endif
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#define HAVE_ARCH_UNMAPPED_AREA
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#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
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#ifndef __ASSEMBLY__
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struct mm_struct;
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unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
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unsigned long flags, unsigned int psize,
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int topdown);
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unsigned int get_slice_psize(struct mm_struct *mm, unsigned long addr);
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void slice_set_user_psize(struct mm_struct *mm, unsigned int psize);
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void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
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unsigned long len, unsigned int psize);
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#endif /* __ASSEMBLY__ */
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#else /* CONFIG_PPC_MM_SLICES */
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#define slice_set_range_psize(mm, start, len, psize) \
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slice_set_user_psize((mm), (psize))
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#endif /* CONFIG_PPC_MM_SLICES */
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#endif /* _ASM_POWERPC_SLICE_H */
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