87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/* Copyright (c) 2010, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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/*
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mrcmcr.h
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DESCRIPTION: Convenience macros for access the cp registers in the arm.
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REV/DATE: Fri Mar 18 16:34:44 EST 2005
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*/
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#ifndef __mrcmcr__h_
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#define __mrcmcr__h_
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/*
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* Define some convenience macros to acccess the cp registers from c code
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* Lots of macro trickery here.
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*
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* Takes the same format as the asm instructions and unfortunatly you cannot
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* use variables to select the crn, crn or op fields...
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*
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* For those unfamiliar with the # and string stuff.
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* # creates a string from the value and any two strings that are beside
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* are concatenated...thus these create one big asm string for the
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* inline asm code.
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*
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* When compiled these compile to single asm instructions (fast) but
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* without all the hassel of __asm__ __volatile__ (...) =r
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*
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* Format is:
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*
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* unsigned long reg; // destination variable
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* MRC(reg, p15, 0, c1, c0, 0 );
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*
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* MRC read control register
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* MCR control register write
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*/
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/*
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* Some assembly macros so we can use the same macros as in the C version.
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* Turns the ASM code a little C-ish but keeps the code consistent and in
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* one location...
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*/
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#ifdef __ASSEMBLY__
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#define MRC(reg, processor, op1, crn, crm, op2) \
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(mrc processor , op1 , reg, crn , crm , op2)
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#define MCR(reg, processor, op1, crn, crm, op2) \
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(mcr processor , op1 , reg, crn , crm , op2)
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/*
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* C version of the macros.
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*/
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#else
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#define MRC(reg, processor, op1, crn, crm, op2) \
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__asm__ __volatile__ ( \
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" mrc " #processor "," #op1 ", %0," #crn "," #crm "," #op2 "\n" \
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: "=r" (reg))
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#define MCR(reg, processor, op1, crn, crm, op2) \
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__asm__ __volatile__ ( \
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" mcr " #processor "," #op1 ", %0," #crn "," #crm "," #op2 "\n" \
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: : "r" (reg))
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#endif
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/*
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* Easy access convenience function to read CP15 registers from c code
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*/
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#define MRC15(reg, op1, crn, crm, op2) MRC(reg, p15, op1, crn, crm, op2)
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#define MCR15(reg, op1, crn, crm, op2) MCR(reg, p15, op1, crn, crm, op2)
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#endif
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