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