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Linux/arch/sh/mm/uncached.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/init.h>
  3 #include <linux/module.h>
  4 #include <linux/sizes.h>
  5 #include <asm/page.h>
  6 #include <asm/addrspace.h>
  7 
  8 /*
  9  * This is the offset of the uncached section from its cached alias.
 10  *
 11  * Legacy platforms handle trivial transitions between cached and
 12  * uncached segments by making use of the 1:1 mapping relationship in
 13  * 512MB lowmem, others via a special uncached mapping.
 14  *
 15  * Default value only valid in 29 bit mode, in 32bit mode this will be
 16  * updated by the early PMB initialization code.
 17  */
 18 unsigned long cached_to_uncached = SZ_512M;
 19 unsigned long uncached_size = SZ_512M;
 20 unsigned long uncached_start, uncached_end;
 21 EXPORT_SYMBOL(uncached_start);
 22 EXPORT_SYMBOL(uncached_end);
 23 
 24 int virt_addr_uncached(unsigned long kaddr)
 25 {
 26         return (kaddr >= uncached_start) && (kaddr < uncached_end);
 27 }
 28 EXPORT_SYMBOL(virt_addr_uncached);
 29 
 30 void __init uncached_init(void)
 31 {
 32 #if defined(CONFIG_29BIT) || !defined(CONFIG_MMU)
 33         uncached_start = P2SEG;
 34 #else
 35         uncached_start = memory_end;
 36 #endif
 37         uncached_end = uncached_start + uncached_size;
 38 }
 39 
 40 void __init uncached_resize(unsigned long size)
 41 {
 42         uncached_size = size;
 43         uncached_end = uncached_start + uncached_size;
 44 }
 45 

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