Nuovo supporto unificato per detect della CPU

[bertos.git] / cpu.h

diff --git a/cpu.h b/cpu.h
index 09240a0a68a7faeffe3bcd9f518847efa3fe2bee..c8a242f22645931af2252572d9ed3d8027a21d46 100755 (executable)
--- a/cpu.h
+++ b/cpu.h
@@ -11,10 +11,24 @@
  * \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.
  *
@@ -33,20 +47,23 @@
 
 #include "compiler.h"
 
+
 //! Initialization value for registers in stack frame
 #define CPU_REG_INIT_VALUE(reg)     0
 
-// Macros for determining CPU endianness
+// 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 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? */
 
        typedef uint16_t cpuflags_t; // FIXME
        typedef unsigned int cpustack_t;
@@ -56,12 +73,11 @@
        #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;
@@ -71,12 +87,11 @@
        #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)
@@ -111,7 +126,6 @@
        #define NOP                     asm volatile ("nop" ::)
        #define DISABLE_INTS            asm volatile ("cli" ::)
        #define ENABLE_INTS             asm volatile ("sei" ::)
-       #define SCHEDULER_IDLE          /* nothing */
 
        #define DISABLE_IRQSAVE(x) \
        do { \
@@ -137,8 +151,6 @@
        #define CPU_STACK_GROWS_UPWARD  0
        #define CPU_SP_ON_EMPTY_SLOT    1
        #define CPU_BYTE_ORDER          CPU_LITTLE_ENDIAN
-#else
-       #error Unknown CPU
 #endif
 
 
@@ -185,7 +197,7 @@
 #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.
@@ -214,22 +226,24 @@
 #endif
 
 
-INLINE uint16_t htobe16(uint16_t n);
-INLINE uint16_t htobe16(uint16_t n)
-{
-       if (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN)
-               n = n << 8 | n >> 8;
-
-       return n;
-}
-
-INLINE uint16_t htole16(uint16_t n);
-INLINE uint16_t htole16(uint16_t n)
-{
-       if (CPU_BYTE_ORDER == CPU_BIG_ENDIAN)
-               n = n << 8 | n >> 8;
-
-       return n;
-}
+/*!
+ * \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 */