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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/mips/lib/uncached.c
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2005 Thiemo Seufer
7 * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
8 * Author: Maciej W. Rozycki <macro@mips.com>
12 #include <asm/addrspace.h>
14 #include <asm/cacheflush.h>
20 #define TO_PHYS_MASK -1
24 * FUNC is executed in one of the uncached segments, depending on its
25 * original address as follows:
27 * 1. If the original address is in CKSEG0 or CKSEG1, then the uncached
28 * segment used is CKSEG1.
29 * 2. If the original address is in XKPHYS, then the uncached segment
31 * 3. Otherwise it's a bug.
33 * The same remapping is done with the stack pointer. Stack handling
34 * works because we don't handle stack arguments or more complex return
35 * values, so we can avoid sharing the same stack area between a cached
36 * and the uncached mode.
38 unsigned long run_uncached(void *func
)
40 register long sp
__asm__("$sp");
41 register long ret
__asm__("$2");
42 long lfunc
= (long)func
, ufunc
;
45 if (sp
>= (long)CKSEG0
&& sp
< (long)CKSEG2
)
48 else if ((long long)sp
>= (long long)PHYS_TO_XKPHYS(0, 0) &&
49 (long long)sp
< (long long)PHYS_TO_XKPHYS(8, 0))
50 usp
= PHYS_TO_XKPHYS(K_CALG_UNCACHED
,
51 XKPHYS_TO_PHYS((long long)sp
));
57 if (lfunc
>= (long)CKSEG0
&& lfunc
< (long)CKSEG2
)
58 ufunc
= CKSEG1ADDR(lfunc
);
60 else if ((long long)lfunc
>= (long long)PHYS_TO_XKPHYS(0, 0) &&
61 (long long)lfunc
< (long long)PHYS_TO_XKPHYS(8, 0))
62 ufunc
= PHYS_TO_XKPHYS(K_CALG_UNCACHED
,
63 XKPHYS_TO_PHYS((long long)lfunc
));
70 __asm__
__volatile__ (
76 : "r" (usp
), "r" (ufunc
)