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Diffstat (limited to 'cc3200/hal/cpu.c')
| -rw-r--r-- | cc3200/hal/cpu.c | 412 |
1 files changed, 412 insertions, 0 deletions
diff --git a/cc3200/hal/cpu.c b/cc3200/hal/cpu.c new file mode 100644 index 0000000000..29d10afb25 --- /dev/null +++ b/cc3200/hal/cpu.c @@ -0,0 +1,412 @@ +//***************************************************************************** +// +// 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 |