1/*
 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
 4 * for more details.
 5 *
 6 * Copyright (C) 2005 Thiemo Seufer
 7 * Copyright (C) 2005  MIPS Technologies, Inc.  All rights reserved.
 8 *	Author: Maciej W. Rozycki <macro@mips.com>
 9 */
10
11#include <linux/init.h>
12
13#include <asm/addrspace.h>
14#include <asm/bug.h>
15#include <asm/cacheflush.h>
16
17#ifndef CKSEG2
18#define CKSEG2 CKSSEG
19#endif
20#ifndef TO_PHYS_MASK
21#define TO_PHYS_MASK -1
22#endif
23
24/*
25 * FUNC is executed in one of the uncached segments, depending on its
26 * original address as follows:
27 *
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
31 *    used is XKPHYS(2).
32 * 3. Otherwise it's a bug.
33 *
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.
38 */
39unsigned long __cpuinit run_uncached(void *func)
40{
41	register long sp __asm__("$sp");
42	register long ret __asm__("$2");
43	long lfunc = (long)func, ufunc;
44	long usp;
45
46	if (sp >= (long)CKSEG0 && sp < (long)CKSEG2)
47		usp = CKSEG1ADDR(sp);
48#ifdef CONFIG_64BIT
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));
53#endif
54	else {
55		BUG();
56		usp = sp;
57	}
58	if (lfunc >= (long)CKSEG0 && lfunc < (long)CKSEG2)
59		ufunc = CKSEG1ADDR(lfunc);
60#ifdef CONFIG_64BIT
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));
65#endif
66	else {
67		BUG();
68		ufunc = lfunc;
69	}
70
71	__asm__ __volatile__ (
72		"	move	$16, $sp\n"
73		"	move	$sp, %1\n"
74		"	jalr	%2\n"
75		"	move	$sp, $16"
76		: "=r" (ret)
77		: "r" (usp), "r" (ufunc)
78		: "$16", "$31");
79
80	return ret;
81}

 1/*
 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
 4 * for more details.
 5 *
 6 * Copyright (C) 2005 Thiemo Seufer
 7 * Copyright (C) 2005  MIPS Technologies, Inc.	All rights reserved.
 8 *	Author: Maciej W. Rozycki <macro@mips.com>
 9 */
10
 
11
12#include <asm/addrspace.h>
13#include <asm/bug.h>
14#include <asm/cacheflush.h>
15
16#ifndef CKSEG2
17#define CKSEG2 CKSSEG
18#endif
19#ifndef TO_PHYS_MASK
20#define TO_PHYS_MASK -1
21#endif
22
23/*
24 * FUNC is executed in one of the uncached segments, depending on its
25 * original address as follows:
26 *
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
30 *    used is XKPHYS(2).
31 * 3. Otherwise it's a bug.
32 *
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.
37 */
38unsigned long run_uncached(void *func)
39{
40	register long sp __asm__("$sp");
41	register long ret __asm__("$2");
42	long lfunc = (long)func, ufunc;
43	long usp;
44
45	if (sp >= (long)CKSEG0 && sp < (long)CKSEG2)
46		usp = CKSEG1ADDR(sp);
47#ifdef CONFIG_64BIT
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));
52#endif
53	else {
54		BUG();
55		usp = sp;
56	}
57	if (lfunc >= (long)CKSEG0 && lfunc < (long)CKSEG2)
58		ufunc = CKSEG1ADDR(lfunc);
59#ifdef CONFIG_64BIT
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));
64#endif
65	else {
66		BUG();
67		ufunc = lfunc;
68	}
69
70	__asm__ __volatile__ (
71		"	move	$16, $sp\n"
72		"	move	$sp, %1\n"
73		"	jalr	%2\n"
74		"	move	$sp, $16"
75		: "=r" (ret)
76		: "r" (usp), "r" (ufunc)
77		: "$16", "$31");
78
79	return ret;
80}