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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
9edef286 | 2 | #include <linux/init.h> |
5b34d1ee | 3 | #include <linux/module.h> |
9edef286 PM |
4 | #include <asm/sizes.h> |
5 | #include <asm/page.h> | |
40d1f004 | 6 | #include <asm/addrspace.h> |
9edef286 PM |
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; | |
5b34d1ee PM |
21 | EXPORT_SYMBOL(uncached_start); |
22 | EXPORT_SYMBOL(uncached_end); | |
9edef286 PM |
23 | |
24 | int virt_addr_uncached(unsigned long kaddr) | |
25 | { | |
26 | return (kaddr >= uncached_start) && (kaddr < uncached_end); | |
27 | } | |
5b34d1ee | 28 | EXPORT_SYMBOL(virt_addr_uncached); |
9edef286 PM |
29 | |
30 | void __init uncached_init(void) | |
31 | { | |
e2fcf74f | 32 | #if defined(CONFIG_29BIT) || !defined(CONFIG_MMU) |
40d1f004 PM |
33 | uncached_start = P2SEG; |
34 | #else | |
9edef286 | 35 | uncached_start = memory_end; |
40d1f004 | 36 | #endif |
9edef286 PM |
37 | uncached_end = uncached_start + uncached_size; |
38 | } | |
d01447b3 PM |
39 | |
40 | void __init uncached_resize(unsigned long size) | |
41 | { | |
42 | uncached_size = size; | |
43 | uncached_end = uncached_start + uncached_size; | |
44 | } |