413 lines
11 KiB
C
413 lines
11 KiB
C
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//*****************************************************************************
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//
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// cpu.c
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//
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// Instruction wrappers for special CPU instructions needed by the
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// drivers.
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//
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// Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
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//
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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//*****************************************************************************
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#include "cpu.h"
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//*****************************************************************************
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//
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// Wrapper function for the CPSID instruction. Returns the state of PRIMASK
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// on entry.
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//
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//*****************************************************************************
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#if defined(gcc)
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unsigned long __attribute__((naked))
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CPUcpsid(void)
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{
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unsigned long ulRet;
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//
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// Read PRIMASK and disable interrupts.
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//
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__asm(" mrs r0, PRIMASK\n"
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" cpsid i\n"
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" dsb \n"
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" isb \n"
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" bx lr\n"
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: "=r" (ulRet));
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//
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// The return is handled in the inline assembly, but the compiler will
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// still complain if there is not an explicit return here (despite the fact
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// that this does not result in any code being produced because of the
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// naked attribute).
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//
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return(ulRet);
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}
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#endif
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#if defined(ewarm)
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unsigned long
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CPUcpsid(void)
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{
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//
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// Read PRIMASK and disable interrupts.
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//
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__asm(" mrs r0, PRIMASK\n"
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" cpsid i\n"
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" dsb \n"
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" isb \n");
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//
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// "Warning[Pe940]: missing return statement at end of non-void function"
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// is suppressed here to avoid putting a "bx lr" in the inline assembly
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// above and a superfluous return statement here.
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//
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#pragma diag_suppress=Pe940
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}
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#pragma diag_default=Pe940
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#endif
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#if defined(ccs)
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unsigned long
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CPUcpsid(void)
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{
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//
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// Read PRIMASK and disable interrupts.
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//
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__asm(" mrs r0, PRIMASK\n"
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" cpsid i\n"
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" dsb \n"
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" isb \n"
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" bx lr\n");
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//
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// The following keeps the compiler happy, because it wants to see a
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// return value from this function. It will generate code to return
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// a zero. However, the real return is the "bx lr" above, so the
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// return(0) is never executed and the function returns with the value
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// you expect in R0.
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//
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return(0);
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}
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#endif
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//*****************************************************************************
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//
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// Wrapper function returning the state of PRIMASK (indicating whether
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// interrupts are enabled or disabled).
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//
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//*****************************************************************************
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#if defined(gcc)
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unsigned long __attribute__((naked))
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CPUprimask(void)
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{
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unsigned long ulRet;
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//
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// Read PRIMASK and disable interrupts.
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//
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__asm(" mrs r0, PRIMASK\n"
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" bx lr\n"
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: "=r" (ulRet));
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//
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// The return is handled in the inline assembly, but the compiler will
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// still complain if there is not an explicit return here (despite the fact
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// that this does not result in any code being produced because of the
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// naked attribute).
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//
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return(ulRet);
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}
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#endif
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#if defined(ewarm)
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unsigned long
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CPUprimask(void)
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{
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//
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// Read PRIMASK and disable interrupts.
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//
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__asm(" mrs r0, PRIMASK\n");
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//
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// "Warning[Pe940]: missing return statement at end of non-void function"
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// is suppressed here to avoid putting a "bx lr" in the inline assembly
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// above and a superfluous return statement here.
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//
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#pragma diag_suppress=Pe940
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}
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#pragma diag_default=Pe940
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#endif
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#if defined(ccs)
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unsigned long
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CPUprimask(void)
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{
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//
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// Read PRIMASK and disable interrupts.
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//
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__asm(" mrs r0, PRIMASK\n"
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" bx lr\n");
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//
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// The following keeps the compiler happy, because it wants to see a
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// return value from this function. It will generate code to return
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// a zero. However, the real return is the "bx lr" above, so the
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// return(0) is never executed and the function returns with the value
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// you expect in R0.
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//
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return(0);
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}
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#endif
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//*****************************************************************************
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//
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// Wrapper function for the CPSIE instruction. Returns the state of PRIMASK
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// on entry.
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//
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//*****************************************************************************
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#if defined(gcc)
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unsigned long __attribute__((naked))
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CPUcpsie(void)
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{
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unsigned long ulRet;
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//
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// Read PRIMASK and enable interrupts.
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//
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__asm(" mrs r0, PRIMASK\n"
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" cpsie i\n"
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" dsb \n"
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" isb \n"
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" bx lr\n"
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: "=r" (ulRet));
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//
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// The return is handled in the inline assembly, but the compiler will
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// still complain if there is not an explicit return here (despite the fact
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// that this does not result in any code being produced because of the
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// naked attribute).
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//
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return(ulRet);
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}
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#endif
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#if defined(ewarm)
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unsigned long
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CPUcpsie(void)
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{
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//
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// Read PRIMASK and enable interrupts.
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//
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__asm(" mrs r0, PRIMASK\n"
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" cpsie i\n"
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" dsb \n"
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" isb \n");
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//
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// "Warning[Pe940]: missing return statement at end of non-void function"
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// is suppressed here to avoid putting a "bx lr" in the inline assembly
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// above and a superfluous return statement here.
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//
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#pragma diag_suppress=Pe940
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}
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#pragma diag_default=Pe940
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#endif
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#if defined(ccs)
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unsigned long
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CPUcpsie(void)
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{
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//
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// Read PRIMASK and enable interrupts.
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//
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__asm(" mrs r0, PRIMASK\n"
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" cpsie i\n"
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" dsb \n"
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" isb \n"
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" bx lr\n");
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//
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// The following keeps the compiler happy, because it wants to see a
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// return value from this function. It will generate code to return
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// a zero. However, the real return is the "bx lr" above, so the
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// return(0) is never executed and the function returns with the value
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// you expect in R0.
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//
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return(0);
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}
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#endif
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//*****************************************************************************
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//
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// Wrapper function for the WFI instruction.
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//
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//*****************************************************************************
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#if defined(gcc)
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void __attribute__((naked))
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CPUwfi(void)
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{
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//
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// Wait for the next interrupt.
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//
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__asm(" dsb \n"
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" isb \n"
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" wfi \n"
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" bx lr\n");
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}
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#endif
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#if defined(ewarm)
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void
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CPUwfi(void)
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{
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//
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// Wait for the next interrupt.
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//
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__asm(" dsb \n"
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" isb \n"
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" wfi \n");
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}
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#endif
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#if defined(ccs)
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void
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CPUwfi(void)
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{
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//
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// Wait for the next interrupt.
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//
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__asm(" dsb \n"
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" isb \n"
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" wfi \n");
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}
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#endif
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//*****************************************************************************
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//
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// Wrapper function for writing the BASEPRI register.
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//
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//*****************************************************************************
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#if defined(gcc)
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void __attribute__((naked))
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CPUbasepriSet(unsigned long ulNewBasepri)
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{
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//
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// Set the BASEPRI register
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//
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__asm(" msr BASEPRI, r0\n"
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" dsb \n"
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" isb \n"
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" bx lr\n");
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}
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#endif
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#if defined(ewarm)
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void
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CPUbasepriSet(unsigned long ulNewBasepri)
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{
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//
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// Set the BASEPRI register
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//
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__asm(" msr BASEPRI, r0\n"
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" dsb \n"
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" isb \n");
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}
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#endif
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#if defined(ccs)
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void
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CPUbasepriSet(unsigned long ulNewBasepri)
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{
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//
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// Set the BASEPRI register
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//
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__asm(" msr BASEPRI, r0\n"
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" dsb \n"
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" isb \n");
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}
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#endif
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//*****************************************************************************
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//
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// Wrapper function for reading the BASEPRI register.
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//
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//*****************************************************************************
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#if defined(gcc)
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unsigned long __attribute__((naked))
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CPUbasepriGet(void)
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{
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unsigned long ulRet;
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//
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// Read BASEPRI
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//
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__asm(" mrs r0, BASEPRI\n"
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" bx lr\n"
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: "=r" (ulRet));
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//
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// The return is handled in the inline assembly, but the compiler will
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// still complain if there is not an explicit return here (despite the fact
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// that this does not result in any code being produced because of the
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// naked attribute).
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//
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return(ulRet);
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}
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#endif
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#if defined(ewarm)
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unsigned long
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CPUbasepriGet(void)
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{
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//
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// Read BASEPRI
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//
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__asm(" mrs r0, BASEPRI\n");
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//
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// "Warning[Pe940]: missing return statement at end of non-void function"
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// is suppressed here to avoid putting a "bx lr" in the inline assembly
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// above and a superfluous return statement here.
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//
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#pragma diag_suppress=Pe940
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}
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#pragma diag_default=Pe940
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#endif
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#if defined(ccs)
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unsigned long
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CPUbasepriGet(void)
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{
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//
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// Read BASEPRI
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//
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__asm(" mrs r0, BASEPRI\n"
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" bx lr\n");
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//
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||
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// The following keeps the compiler happy, because it wants to see a
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||
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// return value from this function. It will generate code to return
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||
|
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// a zero. However, the real return is the "bx lr" above, so the
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||
|
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// return(0) is never executed and the function returns with the value
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// you expect in R0.
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||
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//
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return(0);
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}
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#endif
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