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>
11 #include <linux/init.h>
13 #include <asm/addrspace.h>
15 #include <asm/cacheflush.h>
21 #define TO_PHYS_MASK -1
25 * FUNC is executed in one of the uncached segments, depending on its
26 * original address as follows:
28 * 1. If the original address is in CKSEG0 or CKSEG1, then the uncached
29 * segment used is CKSEG1.
30 * 2. If the original address is in XKPHYS, then the uncached segment
32 * 3. Otherwise it's a bug.
34 * The same remapping is done with the stack pointer. Stack handling
35 * works because we don't handle stack arguments or more complex return
36 * values, so we can avoid sharing the same stack area between a cached
37 * and the uncached mode.
39 unsigned long __cpuinit
run_uncached(void *func
)
41 register long sp
__asm__("$sp");
42 register long ret
__asm__("$2");
43 long lfunc
= (long)func
, ufunc
;
46 if (sp
>= (long)CKSEG0
&& sp
< (long)CKSEG2
)
49 else if ((long long)sp
>= (long long)PHYS_TO_XKPHYS(0, 0) &&
50 (long long)sp
< (long long)PHYS_TO_XKPHYS(8, 0))
51 usp
= PHYS_TO_XKPHYS(K_CALG_UNCACHED
,
52 XKPHYS_TO_PHYS((long long)sp
));
58 if (lfunc
>= (long)CKSEG0
&& lfunc
< (long)CKSEG2
)
59 ufunc
= CKSEG1ADDR(lfunc
);
61 else if ((long long)lfunc
>= (long long)PHYS_TO_XKPHYS(0, 0) &&
62 (long long)lfunc
< (long long)PHYS_TO_XKPHYS(8, 0))
63 ufunc
= PHYS_TO_XKPHYS(K_CALG_UNCACHED
,
64 XKPHYS_TO_PHYS((long long)lfunc
));
71 __asm__
__volatile__ (
77 : "r" (usp
), "r" (ufunc
)
This page took 0.031146 seconds and 5 git commands to generate.