58 lines
1.2 KiB
C
58 lines
1.2 KiB
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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static ioremap_prot_hook_t ioremap_prot_hook;
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int arm64_ioremap_prot_hook_register(ioremap_prot_hook_t hook)
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{
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if (WARN_ON(ioremap_prot_hook))
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return -EBUSY;
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ioremap_prot_hook = hook;
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return 0;
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}
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void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
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unsigned long prot)
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{
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unsigned long last_addr = phys_addr + size - 1;
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pgprot_t pgprot = __pgprot(prot);
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/* Don't allow outside PHYS_MASK */
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if (last_addr & ~PHYS_MASK)
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return NULL;
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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 NULL;
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/*
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* If a hook is registered (e.g. for confidential computing
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* purposes), call that now and barf if it fails.
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*/
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if (unlikely(ioremap_prot_hook) &&
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WARN_ON(ioremap_prot_hook(phys_addr, size, &pgprot))) {
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return NULL;
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}
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return generic_ioremap_prot(phys_addr, size, pgprot);
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}
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EXPORT_SYMBOL(ioremap_prot);
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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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