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44 lines
1.2 KiB
44 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/sizes.h> |
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#include <asm/page.h> |
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#include <asm/addrspace.h> |
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/* |
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* This is the offset of the uncached section from its cached alias. |
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* |
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* Legacy platforms handle trivial transitions between cached and |
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* uncached segments by making use of the 1:1 mapping relationship in |
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* 512MB lowmem, others via a special uncached mapping. |
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* |
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* Default value only valid in 29 bit mode, in 32bit mode this will be |
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* updated by the early PMB initialization code. |
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*/ |
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unsigned long cached_to_uncached = SZ_512M; |
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unsigned long uncached_size = SZ_512M; |
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unsigned long uncached_start, uncached_end; |
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EXPORT_SYMBOL(uncached_start); |
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EXPORT_SYMBOL(uncached_end); |
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int virt_addr_uncached(unsigned long kaddr) |
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{ |
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return (kaddr >= uncached_start) && (kaddr < uncached_end); |
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} |
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EXPORT_SYMBOL(virt_addr_uncached); |
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void __init uncached_init(void) |
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{ |
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#if defined(CONFIG_29BIT) || !defined(CONFIG_MMU) |
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uncached_start = P2SEG; |
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#else |
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uncached_start = memory_end; |
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#endif |
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uncached_end = uncached_start + uncached_size; |
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} |
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void __init uncached_resize(unsigned long size) |
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{ |
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uncached_size = size; |
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uncached_end = uncached_start + uncached_size; |
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}
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