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Linux/arch/mips/lib/uncached.c

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  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  */
 38 unsigned 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 }
 81 

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