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nuttx/arch/hc/include/hcs12/irq.h

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/************************************************************************************
* arch/hc/include/hcs12/irq.h
*
* Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name NuttX 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.
*
************************************************************************************/
/* This file should never be included directed but, rather,
* only indirectly through nuttx/irq.h
*/
#ifndef __ARCH_HC_INCLUDE_HCS12_IRQ_H
#define __ARCH_HC_INCLUDE_HCS12_IRQ_H
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include <nuttx/irq.h>
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/* CCR bit definitions */
#define HCS12_CCR_C (1 << 0) /* Bit 0: Carry/Borrow status bit */
#define HCS12_CCR_V (1 << 1) /* Bit 1: Two<77>s complement overflow status bit */
#define HCS12_CCR_Z (1 << 2) /* Bit 2: Zero status bit */
#define HCS12_CCR_N (1 << 3) /* Bit 3: Negative status bit */
#define HCS12_CCR_I (1 << 4) /* Bit 4: Maskable interrupt control bit */
#define HCS12_CCR_H (1 << 5) /* Bit 5: Half-carry status bit */
#define HCS12_CCR_X (1 << 6) /* Bit 6: Non-maskable interrupt control bit */
#define HCS12_CCR_S (1 << 7) /* Bit 7: STOP instruction control bit */
/************************************************************************************
* Register state save strucure
* Low Address <-- SP after state save
* [PPAGE]
* [soft regisers]
* XYH
* XYL
* ZH
* ZL
* TMPH
* TMPL
* FRAMEH
* FRAMEL
* SP <-- SP after interrupt
* CCR
* B
* A
* XH
* XL
* YH
* YL
* PCH
* High Address PCL <-- SP before interrupt
*
************************************************************************************/
/* Byte offsets */
/* PPAGE register (only in banked mode) */
#ifndef CONFIG_HCS12_NONBANKED
# define REG_PPAGE 0
# define REG_FIRST_SOFTREG 1
#else
# define REG_FIRST_SOFTREG 0
#endif
/* Soft registers (as configured) */
#if CONFIG_HCS12_MSOFTREGS > 2
# error "Need to save more registers"
#elif CONFIG_HCS12_MSOFTREGS == 2
# define REG_SOFTREG1 REG_FIRST_SOFTREG
# define REG_SOFTREG2 (REG_FIRST_SOFTREG+2)
# define REG_FIRST_HARDREG (REG_FIRST_SOFTREG+4)
#elif CONFIG_HCS12_MSOFTREGS == 1
# define REG_SOFTREG1 REG_FIRST_SOFTREG
# define REG_FIRST_HARDREG (REG_FIRST_SOFTREG+2)
#else
# define REG_FIRST_HARDREG REG_FIRST_SOFTREG
#endif
#define REG_XY REG_FIRST_HARDREG
#define REG_Z (REG_FIRST_HARDREG+2)
# define REG_ZH (REG_FIRST_HARDREG+2)
# define REG_ZL (REG_FIRST_HARDREG+3)
#define REG_TMP (REG_FIRST_HARDREG+4)
# define REG_TMPH (REG_FIRST_HARDREG+4)
# define REG_TMPL (REG_FIRST_HARDREG+5)
#define REG_FRAME (REG_FIRST_HARDREG+6)
# define REG_FRAMEH (REG_FIRST_HARDREG+6)
# define REG_FRAMEL (REG_FIRST_HARDREG+7)
/* Stack pointer before the interrupt */
#define REG_SP (REG_FIRST_HARDREG+8)
# define REG_SPH (REG_FIRST_HARDREG+8)
# define REG_SPL (REG_FIRST_HARDREG+9)
/* On entry into an I- or X-interrupt, into an SWI, or into an undefined instruction
* interrupt, the stack frame created by hardware looks like:
*
* Low Address <-- SP after interrupt
* CCR
* B
* A
* XH
* XL
* YH
* YL
* PCH
* High Address PCL <-- SP before interrupt
*/
#define REG_CCR (REG_FIRST_HARDREG+10)
#define REG_BA (REG_FIRST_HARDREG+11)
# define REG_B (REG_FIRST_HARDREG+11)
# define REG_A (REG_FIRST_HARDREG+12)
#define REG_X (REG_FIRST_HARDREG+13)
# define REG_XH (REG_FIRST_HARDREG+13)
# define REG_XL (REG_FIRST_HARDREG+14)
#define REG_Y (REG_FIRST_HARDREG+15)
# define REG_YH (REG_FIRST_HARDREG+15)
# define REG_YL (REG_FIRST_HARDREG+16)
#define REG_PC (REG_FIRST_HARDREG+17)
# define REG_PCH (REG_FIRST_HARDREG+17)
# define REG_PCL (REG_FIRST_HARDREG+18)
#define TOTALFRAME_SIZE (REG_FIRST_HARDREG+17)
#define INTFRAME_SIZE 9
#define XCPTCONTEXT_REGS TOTALFRAME_SIZE
/************************************************************************************
* Public Types
************************************************************************************/
/* This structure defines the way the registers are stored. */
#ifndef __ASSEMBLY__
struct xcptcontext
{
uint8_t regs[XCPTCONTEXT_REGS];
};
/****************************************************************************
* Inline functions
****************************************************************************/
/* Name: up_irq_save, up_irq_restore, and friends.
*
* NOTE: This function should never be called from application code and,
* as a general rule unless you really know what you are doing, this
* function should not be called directly from operation system code either:
* Typically, the wrapper functions, enter_critical_section() and
* leave_critical section(), are probably what you really want.
*/
/* Enable/Disable interrupts */
#define ienable() __asm("cli");
#define idisable() __asm("orcc #0x10")
#define xenable() __asm("andcc #0xbf")
#define xdisable() __asm("orcc #0x40")
/* Get the current value of the stack pointer */
static inline uint16_t up_getsp(void)
{
uint16_t ret;
__asm__
(
"\tsts %0\n"
: "=m"(ret) :
);
return ret;
}
/* Get the current value of the CCR */
static inline irqstate_t up_getccr(void)
{
irqstate_t ccr;
__asm__
(
"\ttpa\n"
"\tstaa %0\n"
: "=m"(ccr) :
);
return ccr;
}
/* Save the current interrupt enable state & disable IRQs */
static inline irqstate_t up_irq_save(void)
{
irqstate_t ccr;
__asm__
(
"\ttpa\n"
"\tstaa %0\n"
"\torcc #0x50\n"
: "=m"(ccr) :
);
return ccr;
}
/* Restore saved interrupt state */
static inline void up_irq_restore(irqstate_t flags)
{
/* Should interrupts be enabled? */
if ((flags & HCS12_CCR_I) == 0)
{
/* Yes.. unmask I- and Z-interrupts */
__asm("andcc #0xaf");
}
}
/* System call */
static inline void system_call3(unsigned int nbr, uintptr_t parm1,
uintptr_t parm2, uintptr_t parm3)
{
/* To be provided */
/* __asm("swi") */
}
/************************************************************************************
* Public Data
************************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/************************************************************************************
* Public Functions
************************************************************************************/
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_HC_INCLUDE_HCS12_IRQ_H */
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