/*!
* \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
* \author Stefano Fedrigo <aleph@develer.com>
*/
-/*
- * $Log$
- * Revision 1.12 2004/08/14 19:37:57 rasky
- * Merge da SC: macros.h, pool.h, BIT_CHANGE, nome dei processi, etc.
- *
- * Revision 1.11 2004/08/05 17:39:56 bernie
- * Fix a Doxygen tag.
- *
- * Revision 1.10 2004/08/02 20:20:29 aleph
- * Merge from project_ks
- *
- * Revision 1.9 2004/07/30 14:24:16 rasky
- * Task switching con salvataggio perfetto stato di interrupt (SR)
- * Kernel monitor per dump informazioni su stack dei processi
- *
- * 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.
- *
- */
-#ifndef CPU_H
-#define CPU_H
+/*#*
+ *#* $Log$
+ *#* 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 */
-#include "compiler.h"
-
-// Macros for determining CPU endianness
+/*!
+ * \name Macros for determining CPU endianness.
+ * \{
+ */
#define CPU_BIG_ENDIAN 0x1234
#define CPU_LITTLE_ENDIAN 0x3412
+/*\}*/
-// Macros to include cpu-specific version of the headers
+/*! Macro to include cpu-specific versions of the headers. */
#define CPU_HEADER(module) PP_STRINGIZE(PP_CAT3(module, _, CPU_ID).h)
#if CPU_I196
- #define DISABLE_INTS disable_interrupt()
- #define ENABLE_INTS enable_interrupt()
#define NOP nop_instruction()
+ #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 CPU_X86
#define NOP asm volatile ("nop")
- #define DISABLE_INTS /* nothing */
- #define ENABLE_INTS /* nothing */
+ #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
+
+ /* 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 IRQ_DISABLE do { asm(bfset #0x0200,SR); asm(nop); } while (0)
+ #define IRQ_ENABLE do { asm(bfclr #0x0200,SR); asm(nop); } while (0)
- #define DISABLE_IRQSAVE(x) \
+ #define IRQ_SAVE_DISABLE(x) \
do { (void)x; asm(move SR,x); asm(bfset #0x0200,SR); } while (0)
- #define ENABLE_IRQRESTORE(x) \
+ #define IRQ_RESTORE(x) \
do { (void)x; 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 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
+
+ /* 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 CPU_AVR
- #define NOP asm volatile ("nop" ::)
- #define DISABLE_INTS asm volatile ("cli" ::)
- #define ENABLE_INTS asm volatile ("sei" ::)
+ #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;
/* Register counts include SREG too */
- #define CPU_REGS_CNT 33
- #define CPU_SAVED_REGS_CNT 19
+ #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.
#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
#if CPU_DSP56K
- /* DSP56k pushes both PC and SR to the stack in the JSR instruction, but
+ /*
+ * 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.
*/
} while (0);
#elif CPU_AVR
- /* In AVR, the addresses are pushed into the stack as little-endian, while
+ /*
+ * 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).
*/
/*!
- * \def SCHEDULER_IDLE
+ * \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
+/*\}*/
+
+/* 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.
*
* profile system load with an external strobe, or to save CPU cycles
* in hosted environments such as emulators.
*/
-#ifndef SCHEDULER_IDLE
+#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 SCHEDULER_IDLE /* nothing */
+ #define CPU_IDLE do { /* nothing */ } while (0)
#endif /* !ARCH_EMUL */
-#endif /* !SCHEDULER_IDLE */
+#endif /* !CPU_IDLE */
+
+/* OBSOLETE */
+#define SCHEDULER_IDLE CPU_IDLE
-#endif /* CPU_H */
+#endif /* DEVLIB_CPU_H */