1 // SPDX-License-Identifier: GPL-2.0 1
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
10 *
11 * Legacy platforms handle trivial transitions
12 * uncached segments by making use of the 1:1
13 * 512MB lowmem, others via a special uncached
14 *
15 * Default value only valid in 29 bit mode, in
16 * updated by the early PMB initialization cod
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) && (k
27 }
28 EXPORT_SYMBOL(virt_addr_uncached);
29
30 void __init uncached_init(void)
31 {
32 #if defined(CONFIG_29BIT) || !defined(CONFIG_M
33 uncached_start = P2SEG;
34 #else
35 uncached_start = memory_end;
36 #endif
37 uncached_end = uncached_start + uncach
38 }
39
40 void __init uncached_resize(unsigned long size
41 {
42 uncached_size = size;
43 uncached_end = uncached_start + uncach
44 }
45
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