1 /* 1 /*
2 * This file is subject to the terms and condi 2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the mai 3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details. 4 * for more details.
5 * 5 *
6 * Copyright (C) 2005 Thiemo Seufer 6 * Copyright (C) 2005 Thiemo Seufer
7 * Copyright (C) 2005 MIPS Technologies, Inc. 7 * Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
8 * Author: Maciej W. Rozycki <macro@mips. 8 * Author: Maciej W. Rozycki <macro@mips.com>
9 */ 9 */
10 10
11 11
12 #include <asm/addrspace.h> 12 #include <asm/addrspace.h>
13 #include <asm/bug.h> 13 #include <asm/bug.h>
14 #include <asm/cacheflush.h> 14 #include <asm/cacheflush.h>
15 15
16 #ifndef CKSEG2 16 #ifndef CKSEG2
17 #define CKSEG2 CKSSEG 17 #define CKSEG2 CKSSEG
18 #endif 18 #endif
19 #ifndef TO_PHYS_MASK 19 #ifndef TO_PHYS_MASK
20 #define TO_PHYS_MASK -1 20 #define TO_PHYS_MASK -1
21 #endif 21 #endif
22 22
23 /* 23 /*
24 * FUNC is executed in one of the uncached seg 24 * FUNC is executed in one of the uncached segments, depending on its
25 * original address as follows: 25 * original address as follows:
26 * 26 *
27 * 1. If the original address is in CKSEG0 or 27 * 1. If the original address is in CKSEG0 or CKSEG1, then the uncached
28 * segment used is CKSEG1. 28 * segment used is CKSEG1.
29 * 2. If the original address is in XKPHYS, th 29 * 2. If the original address is in XKPHYS, then the uncached segment
30 * used is XKPHYS(2). 30 * used is XKPHYS(2).
31 * 3. Otherwise it's a bug. 31 * 3. Otherwise it's a bug.
32 * 32 *
33 * The same remapping is done with the stack p 33 * The same remapping is done with the stack pointer. Stack handling
34 * works because we don't handle stack argumen 34 * works because we don't handle stack arguments or more complex return
35 * values, so we can avoid sharing the same st 35 * values, so we can avoid sharing the same stack area between a cached
36 * and the uncached mode. 36 * and the uncached mode.
37 */ 37 */
38 unsigned long run_uncached(void *func) 38 unsigned long run_uncached(void *func)
39 { 39 {
40 register long ret __asm__("$2"); 40 register long ret __asm__("$2");
41 long lfunc = (long)func, ufunc; 41 long lfunc = (long)func, ufunc;
42 long usp; 42 long usp;
43 long sp; 43 long sp;
44 44
45 __asm__("move %0, $sp" : "=r" (sp)); 45 __asm__("move %0, $sp" : "=r" (sp));
46 46
47 if (sp >= (long)CKSEG0 && sp < (long)C 47 if (sp >= (long)CKSEG0 && sp < (long)CKSEG2)
48 usp = CKSEG1ADDR(sp); 48 usp = CKSEG1ADDR(sp);
49 #ifdef CONFIG_64BIT 49 #ifdef CONFIG_64BIT
50 else if ((long long)sp >= (long long)P 50 else if ((long long)sp >= (long long)PHYS_TO_XKPHYS(0, 0) &&
51 (long long)sp < (long long)PH 51 (long long)sp < (long long)PHYS_TO_XKPHYS(8, 0))
52 usp = PHYS_TO_XKPHYS(K_CALG_UN 52 usp = PHYS_TO_XKPHYS(K_CALG_UNCACHED,
53 XKPHYS_TO 53 XKPHYS_TO_PHYS((long long)sp));
54 #endif 54 #endif
55 else { 55 else {
56 BUG(); 56 BUG();
57 usp = sp; 57 usp = sp;
58 } 58 }
59 if (lfunc >= (long)CKSEG0 && lfunc < ( 59 if (lfunc >= (long)CKSEG0 && lfunc < (long)CKSEG2)
60 ufunc = CKSEG1ADDR(lfunc); 60 ufunc = CKSEG1ADDR(lfunc);
61 #ifdef CONFIG_64BIT 61 #ifdef CONFIG_64BIT
62 else if ((long long)lfunc >= (long lon 62 else if ((long long)lfunc >= (long long)PHYS_TO_XKPHYS(0, 0) &&
63 (long long)lfunc < (long long 63 (long long)lfunc < (long long)PHYS_TO_XKPHYS(8, 0))
64 ufunc = PHYS_TO_XKPHYS(K_CALG_ 64 ufunc = PHYS_TO_XKPHYS(K_CALG_UNCACHED,
65 XKPHYS_ 65 XKPHYS_TO_PHYS((long long)lfunc));
66 #endif 66 #endif
67 else { 67 else {
68 BUG(); 68 BUG();
69 ufunc = lfunc; 69 ufunc = lfunc;
70 } 70 }
71 71
72 __asm__ __volatile__ ( 72 __asm__ __volatile__ (
73 " move $16, $sp\n" 73 " move $16, $sp\n"
74 " move $sp, %1\n" 74 " move $sp, %1\n"
75 " jalr %2\n" 75 " jalr %2\n"
76 " move $sp, $16" 76 " move $sp, $16"
77 : "=r" (ret) 77 : "=r" (ret)
78 : "r" (usp), "r" (ufunc) 78 : "r" (usp), "r" (ufunc)
79 : "$16", "$31"); 79 : "$16", "$31");
80 80
81 return ret; 81 return ret;
82 } 82 }
83 83
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