/*!
* \file
* <!--
- * Copyright 2004 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2004, 2005 Develer S.r.l. (http://www.develer.com/)
* Copyright 2004 Giovanni Bajo
- * This file is part of DevLib - See devlib/README for information.
+ * This file is part of DevLib - See README.devlib 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 1.3 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.
- *
+/*#*
+ *#* $Log$
+ *#* Revision 1.30 2005/03/15 00:20:09 bernie
+ *#* BREAKPOINT, IRQ_RUNNING(), IRQ_GETSTATE(): New DSP56K macros.
+ *#*
+ *#* Revision 1.29 2005/02/16 20:33:24 bernie
+ *#* Preliminary PPC support.
+ *#*
+ *#* Revision 1.28 2004/12/31 17:39:41 bernie
+ *#* Fix documentation.
+ *#*
+ *#* Revision 1.27 2004/12/31 17:02:47 bernie
+ *#* IRQ_SAVE_DISABLE(), IRQ_RESTORE(): Add null stubs for x86.
+ *#*
+ *#* Revision 1.26 2004/12/13 12:08:12 bernie
+ *#* DISABLE_IRQSAVE, ENABLE_IRQRESTORE, DISABLE_INTS, ENABLE_INTS: Remove obsolete macros.
+ *#*
+ *#* Revision 1.25 2004/12/08 08:31:02 bernie
+ *#* CPU_HARVARD: Define to 1 for AVR and DSP56K.
+ *#*/
+#ifndef DEVLIB_CPU_H
+#define DEVLIB_CPU_H
+
+#include "compiler.h" /* for uintXX_t */
+
+
+/*!
+ * \name Macros for determining CPU endianness.
+ * \{
*/
-#ifndef CPU_H
-#define CPU_H
+#define CPU_BIG_ENDIAN 0x1234
+#define CPU_LITTLE_ENDIAN 0x3412
+/*\}*/
-#include "compiler.h"
+/*! Macro to include cpu-specific versions of the headers. */
+#define CPU_HEADER(module) PP_STRINGIZE(PP_CAT3(module, _, CPU_ID).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 */
+#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? */
+ #define IRQ_DISABLE disable_interrupt()
+ #define IRQ_ENABLE enable_interrupt()
typedef uint16_t cpuflags_t; // FIXME
typedef unsigned int cpustack_t;
+ #define CPU_REG_BITS 16
#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
+ #define CPU_HARVARD 0
-#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()
+ #define IRQ_DISABLE /* nothing */
+ #define IRQ_ENABLE /* nothing */
+ #define IRQ_SAVE_DISABLE(x) /* nothing */
+ #define IRQ_RESTORE(x) /* nothing */
typedef uint32_t cpuflags_t; // FIXME
typedef uint32_t cpustack_t;
+ #define CPU_REG_BITS 32
#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
+ #define CPU_HARVARD 0
+
+#elif CPU_PPC
+ #define NOP asm volatile ("nop" ::)
+ #define IRQ_DISABLE FIXME
+ #define IRQ_ENABLE FIXME
+ #define IRQ_SAVE_DISABLE(x) FIXME
+ #define IRQ_RESTORE(x) FIXME
+ #define IRQ_GETSTATE() FIXME
+
+ typedef uint32_t cpuflags_t; // FIXME
+ typedef uint32_t cpustack_t; // FIXME
-#elif defined(__m56800E__) || defined(__m56800__) /* DSP56K */
+ /* Register counts include SREG too */
+ #define CPU_REG_BITS (CPU_PPC32 ? 32 : 64)
+ #define CPU_REGS_CNT FIXME
+ #define CPU_SAVED_REGS_CNT FIXME
+ #define CPU_STACK_GROWS_UPWARD 0 //FIXME
+ #define CPU_SP_ON_EMPTY_SLOT 0 //FIXME
+ #define CPU_BYTE_ORDER (__BIG_ENDIAN__ ? CPU_BIG_ENDIAN : CPU_LITTLE_ENDIAN)
+ #define CPU_HARVARD 0
+
+#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 BREAKPOINT asm(debug)
+ #define IRQ_DISABLE do { asm(bfset #0x0200,SR); asm(nop); } while (0)
+ #define IRQ_ENABLE do { asm(bfclr #0x0200,SR); asm(nop); } while (0)
+
+ #define IRQ_SAVE_DISABLE(x) \
+ do { (void)x; asm(move SR,x); asm(bfset #0x0200,SR); } while (0)
+ #define IRQ_RESTORE(x) \
+ do { (void)x; asm(move x,SR); } while (0)
+
+ static inline bool irq_running(void)
+ {
+ extern void *user_sp;
+ return !!user_sp;
+ }
+ #define IRQ_RUNNING() irq_running()
+
+ static inline bool irq_getstate(void)
+ {
+ uint16_t x;
+ asm(move SR,x);
+ return !(x & 0x0200);
+ }
+ #define IRQ_GETSTATE() irq_getstate()
+
- #define DISABLE_IRQSAVE(x) \
- do { asm(move SR,x); asm(bfset #0x0200,SR); } while (0)
- #define ENABLE_IRQRESTORE(x) \
- do { asm(move x,SR); } while (0)
typedef uint16_t cpuflags_t;
typedef unsigned int cpustack_t;
+ #define CPU_REG_BITS 16
#define CPU_REGS_CNT FIXME
- #define CPU_SAVED_REGS_CNT 28
+ #define CPU_SAVED_REGS_CNT 8
#define CPU_STACK_GROWS_UPWARD 1
#define CPU_SP_ON_EMPTY_SLOT 0
+ #define CPU_BYTE_ORDER CPU_BIG_ENDIAN
+ #define CPU_HARVARD 1
- #undef CPU_REG_INIT_VALUE
- INLINE uint16_t CPU_REG_INIT_VALUE(int reg)
- {
- if (reg == 14)
- {
- uint16_t omr_img;
- asm(move OMR, omr_img);
- return omr_img & (BV(3)/*EX*/ | BV(1)/*MB*/ | BV(0)/*MA*/);
- }
- else if (reg == 16)/*M01*/
- return 0xFFFF;
- return 0;
- }
+ /* Memory is word-addessed in the DSP56K */
+ #define CPU_BITS_PER_CHAR 16
+ #define SIZEOF_SHORT 1
+ #define SIZEOF_INT 1
+ #define SIZEOF_LONG 2
+ #define SIZEOF_PTR 1
-#elif defined (__AVR__)
+#elif CPU_AVR
- #define NOP asm volatile ("nop" ::)
- #define DISABLE_INTS asm volatile ("cli" ::)
- #define ENABLE_INTS asm volatile ("sei" ::)
- #define SCHEDULER_IDLE /* nothing */
+ #define NOP asm volatile ("nop" ::)
+ #define IRQ_DISABLE asm volatile ("cli" ::)
+ #define IRQ_ENABLE asm volatile ("sei" ::)
- #define DISABLE_IRQSAVE(x) \
+ #define IRQ_SAVE_DISABLE(x) \
do { \
__asm__ __volatile__( \
"in %0,__SREG__\n\t" \
); \
} while (0)
- #define ENABLE_IRQRESTORE(x) \
+ #define IRQ_RESTORE(x) \
do { \
__asm__ __volatile__( \
"out __SREG__,%0" : /* no outputs */ : "r" (x) : "cc" \
); \
} while (0)
+ #define IRQ_GETSTATE() \
+ ({ \
+ uint8_t sreg; \
+ __asm__ __volatile__( \
+ "in %0,__SREG__\n\t" \
+ : "=r" (sreg) /* no inputs & no clobbers */ \
+ ); \
+ (bool)(sreg & 0x80); \
+ })
+
typedef uint8_t cpuflags_t;
typedef uint8_t cpustack_t;
- #define CPU_REGS_CNT 32
- #define CPU_SAVED_REGS_CNT 18
+ /* Register counts include SREG too */
+ #define CPU_REG_BITS 8
+ #define CPU_REGS_CNT 33
+ #define CPU_SAVED_REGS_CNT 19
#define CPU_STACK_GROWS_UPWARD 0
- #define CPU_SP_ON_EMPTY_SLOT 1
+ #define CPU_SP_ON_EMPTY_SLOT 1
+ #define CPU_BYTE_ORDER CPU_LITTLE_ENDIAN
+ #define CPU_HARVARD 1
+
+ /*!
+ * Initialization value for registers in stack frame.
+ * The register index is not directly corrispondent to CPU
+ * register numbers. Index 0 is the SREG register: the initial
+ * value is all 0 but the interrupt bit (bit 7).
+ */
+ #define CPU_REG_INIT_VALUE(reg) (reg == 0 ? 0x80 : 0)
-#else
- #error Unknown CPU
+#endif
+
+/*!
+ * Execute \a CODE atomically with respect to interrupts.
+ *
+ * \see IRQ_SAVE_DISABLE IRQ_RESTORE
+ */
+#define ATOMIC(CODE) \
+ do { \
+ cpuflags_t __flags; \
+ IRQ_SAVE_DISABLE(__flags); \
+ CODE; \
+ IRQ_RESTORE(__flags); \
+ } while (0)
+
+
+//! Default for macro not defined in the right arch section
+#ifndef CPU_REG_INIT_VALUE
+ #define CPU_REG_INIT_VALUE(reg) 0
#endif
#endif
-#if defined(__m56800E__) || defined(__m56800__)
- /* DSP56k pushes both PC and SR to the stack in the JSR instruction, but
+#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.
*/
#define CPU_PUSH_CALL_CONTEXT(sp, func) \
do { \
CPU_PUSH_WORD((sp), (func)); \
- CPU_PUSH_WORD((sp), 0); \
+ CPU_PUSH_WORD((sp), 0x100); \
} while (0);
-#elif defined (__AVR__)
- /* In AVR, the addresses are pushed into the stack as little-endian, while
+#elif CPU_AVR
+ /*
+ * In AVR, the addresses are pushed into the stack as little-endian, while
* memory accesses are big-endian (actually, it's a 8-bit CPU, so there is
* no natural endianess).
*/
CPU_PUSH_WORD((sp), (func))
#endif
-#endif /* CPU_H */
+
+/*!
+ * \name Default type sizes.
+ *
+ * These defaults are reasonable for most 16/32bit machines.
+ * Some of these macros may be overridden by CPU-specific code above.
+ *
+ * ANSI C requires that the following equations be true:
+ * \code
+ * sizeof(char) <= sizeof(short) <= sizeof(int) <= sizeof(long)
+ * sizeof(float) <= sizeof(double)
+ * CPU_BITS_PER_CHAR >= 8
+ * CPU_BITS_PER_SHORT >= 8
+ * CPU_BITS_PER_INT >= 16
+ * CPU_BITS_PER_LONG >= 32
+ * \endcode
+ * \{
+ */
+#ifndef SIZEOF_CHAR
+#define SIZEOF_CHAR 1
+#endif
+
+#ifndef SIZEOF_SHORT
+#define SIZEOF_SHORT 2
+#endif
+
+#ifndef SIZEOF_INT
+#if CPU_REG_BITS < 32
+ #define SIZEOF_INT 2
+#else
+ #define SIZEOF_INT 4
+#endif
+#endif /* !SIZEOF_INT */
+
+#ifndef SIZEOF_LONG
+#if CPU_REG_BITS > 32
+ #define SIZEOF_LONG 8
+#else
+ #define SIZEOF_LONG 4
+#endif
+#endif
+
+#ifndef SIZEOF_PTR
+#define SIZEOF_PTR SIZEOF_INT
+#endif
+
+#ifndef CPU_BITS_PER_CHAR
+#define CPU_BITS_PER_CHAR (SIZEOF_CHAR * 8)
+#endif
+
+#ifndef CPU_BITS_PER_SHORT
+#define CPU_BITS_PER_SHORT (SIZEOF_SHORT * CPU_BITS_PER_CHAR)
+#endif
+
+#ifndef CPU_BITS_PER_INT
+#define CPU_BITS_PER_INT (SIZEOF_INT * CPU_BITS_PER_CHAR)
+#endif
+
+#ifndef CPU_BITS_PER_LONG
+#define CPU_BITS_PER_LONG (SIZEOF_LONG * CPU_BITS_PER_CHAR)
+#endif
+
+#ifndef CPU_BITS_PER_PTR
+#define CPU_BITS_PER_PTR (SIZEOF_PTR * CPU_BITS_PER_CHAR)
+#endif
+
+#ifndef BREAKPOINT
+#define BREAKPOINT /* nop */
+#endif
+
+/*\}*/
+
+/* Sanity checks for the above definitions */
+STATIC_ASSERT(sizeof(char) == SIZEOF_CHAR);
+STATIC_ASSERT(sizeof(short) == SIZEOF_SHORT);
+STATIC_ASSERT(sizeof(long) == SIZEOF_LONG);
+STATIC_ASSERT(sizeof(int) == SIZEOF_INT);
+
+
+/*!
+ * \def CPU_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 CPU_IDLE
+ #if defined(ARCH_EMUL) && (ARCH & ARCH_EMUL)
+ /* This emulator hook should yield the CPU to the host. */
+ EXTERN_C_BEGIN
+ void SchedulerIdle(void);
+ EXTERN_C_END
+ #define CPU_IDLE SchedulerIdle()
+ #else /* !ARCH_EMUL */
+ #define CPU_IDLE do { /* nothing */ } while (0)
+ #endif /* !ARCH_EMUL */
+#endif /* !CPU_IDLE */
+
+/* OBSOLETE */
+#define SCHEDULER_IDLE CPU_IDLE
+
+#endif /* DEVLIB_CPU_H */
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