* <!--
* Copyright 2004 Develer S.r.l. (http://www.develer.com/)
* Copyright 2004 Giovanni Bajo
- * All Rights Reserved.
+ * This file is part of DevLib - See devlib/README for information.
* -->
*
* \brief CPU-specific definitions
* \version $Id$
*
* \author Giovanni Bajo <rasky@develer.com>
+ * \author Bernardo Innocenti <bernie@develer.com>
+ * \author Stefano Fedrigo <aleph@develer.com>
*/
/*
* $Log$
+ * Revision 1.8 2004/07/30 14:15:53 rasky
+ * Nuovo supporto unificato per detect della CPU
+ *
+ * Revision 1.7 2004/07/20 23:26:48 bernie
+ * Fix two errors introduced by previous commit.
+ *
+ * Revision 1.6 2004/07/20 23:12:16 bernie
+ * Rationalize and document SCHEDULER_IDLE.
+ *
+ * Revision 1.5 2004/07/20 16:20:35 bernie
+ * Move byte-order macros to mware/byteorder.h; Add missing author names.
+ *
+ * Revision 1.4 2004/07/20 16:06:04 bernie
+ * Add macros to handle endianess issues.
+ *
+ * Revision 1.3 2004/07/18 21:49:51 bernie
+ * Fixes for GCC 3.5.
+ *
+ * Revision 1.2 2004/06/03 11:27:09 bernie
+ * Add dual-license information.
+ *
* Revision 1.1 2004/05/23 17:48:35 bernie
* Add top-level files.
*
#include "compiler.h"
+
//! Initialization value for registers in stack frame
#define CPU_REG_INIT_VALUE(reg) 0
-#if defined(__IAR_SYSTEMS_ICC) || defined(__IAR_SYSTEMS_ICC__) /* 80C196 */
+// Macros for determining CPU endianess
+#define CPU_BIG_ENDIAN 0x1234
+#define CPU_LITTLE_ENDIAN 0x3412
+
+// Macros to include cpu-specific version of the headers
+#define CPU_HEADER(module) PP_STRINGIZE(PP_CAT4(module, _, CPU_ID, .h))
+
+
+#if CPU_I196
#define DISABLE_INTS disable_interrupt()
#define ENABLE_INTS enable_interrupt()
#define NOP nop_instruction()
- #define SCHEDULER_IDLE /* Hmmm... could we go in STOP mode? */
typedef uint16_t cpuflags_t; // FIXME
typedef unsigned int cpustack_t;
#define CPU_REGS_CNT 16
#define CPU_STACK_GROWS_UPWARD 0
#define CPU_SP_ON_EMPTY_SLOT 0
+ #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN
-#elif defined(__i386__) || defined(_MSC_VER) /* x86 */
+#elif CPU_X86
#define NOP asm volatile ("nop")
#define DISABLE_INTS /* nothing */
#define ENABLE_INTS /* nothing */
- #define SCHEDULER_IDLE SchedulerIdle()
typedef uint32_t cpuflags_t; // FIXME
typedef uint32_t cpustack_t;
#define CPU_REGS_CNT 7
#define CPU_STACK_GROWS_UPWARD 0
#define CPU_SP_ON_EMPTY_SLOT 0
+ #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN
-#elif defined(__m56800E__) || defined(__m56800__) /* DSP56K */
+#elif CPU_DSP56K
#define NOP asm(nop)
#define DISABLE_INTS do { asm(bfset #0x0200,SR); asm(nop); } while (0)
#define ENABLE_INTS do { asm(bfclr #0x0200,SR); asm(nop); } while (0)
- #define SCHEDULER_IDLE /* nothing */
#define DISABLE_IRQSAVE(x) \
do { asm(move SR,x); asm(bfset #0x0200,SR); } while (0)
#define CPU_SAVED_REGS_CNT 28
#define CPU_STACK_GROWS_UPWARD 1
#define CPU_SP_ON_EMPTY_SLOT 0
+ #define CPU_BYTE_ORDER CPU_BIG_ENDIAN
#undef CPU_REG_INIT_VALUE
INLINE uint16_t CPU_REG_INIT_VALUE(int reg)
#elif defined (__AVR__)
- #define NOP asm volatile ("nop")
- #define DISABLE_INTS cli()
- #define ENABLE_INTS sei()
- #define SCHEDULER_IDLE /* nothing */
+ #define NOP asm volatile ("nop" ::)
+ #define DISABLE_INTS asm volatile ("cli" ::)
+ #define ENABLE_INTS asm volatile ("sei" ::)
#define DISABLE_IRQSAVE(x) \
do { \
#define CPU_SAVED_REGS_CNT 18
#define CPU_STACK_GROWS_UPWARD 0
#define CPU_SP_ON_EMPTY_SLOT 1
-
-#else
- #error Unknown CPU
+ #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN
#endif
#endif
-#if defined(__m56800E__) || defined(__m56800__)
+#if CPU_DSP56K
/* DSP56k pushes both PC and SR to the stack in the JSR instruction, but
* RTS discards SR while returning (it does not restore it). So we push
* 0 to fake the same context.
CPU_PUSH_WORD((sp), (func))
#endif
+
+/*!
+ * \name SCHEDULER_IDLE
+ *
+ * \brief Invoked by the scheduler to stop the CPU when idle.
+ *
+ * This hook can be redefined to put the CPU in low-power mode, or to
+ * profile system load with an external strobe, or to save CPU cycles
+ * in hosted environments such as emulators.
+ */
+#ifndef SCHEDULER_IDLE
+ #if defined(ARCH_EMUL) && (ARCH & ARCH_EMUL)
+ /* This emulator hook should yeld the CPU to the host. */
+ EXTERN_C_BEGIN
+ void SchedulerIdle(void);
+ EXTERN_C_END
+ #else /* !ARCH_EMUL */
+ #define SCHEDULER_IDLE /* nothing */
+ #endif /* !ARCH_EMUL */
+#endif /* !SCHEDULER_IDLE */
+
#endif /* CPU_H */