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f23eab0bfa
Add hook for arm64's special operation when ioremap(), then ioremap_wc/np/cache is converted to use ioremap_prot() from GENERIC_IOREMAP, update the Copyright and kill the unused inclusions. Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Link: https://lore.kernel.org/r/20220607125027.44946-6-wangkefeng.wang@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
35 lines
716 B
C
35 lines
716 B
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/mm.h>
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#include <linux/io.h>
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bool ioremap_allowed(phys_addr_t phys_addr, size_t size, unsigned long prot)
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{
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unsigned long last_addr = phys_addr + size - 1;
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/* Don't allow outside PHYS_MASK */
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if (last_addr & ~PHYS_MASK)
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return false;
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/* Don't allow RAM to be mapped. */
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if (WARN_ON(pfn_is_map_memory(__phys_to_pfn(phys_addr))))
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return false;
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return true;
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}
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/*
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* Must be called after early_fixmap_init
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*/
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void __init early_ioremap_init(void)
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{
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early_ioremap_setup();
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}
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bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size,
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unsigned long flags)
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{
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unsigned long pfn = PHYS_PFN(offset);
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return pfn_is_map_memory(pfn);
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}
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