Add basic context switching logic

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3682 42af7a65-404d-4744-a932-0658087f49c3

3 files changed, 47 insertions, 13 deletions

diff --git a/nuttx/arch/avr/include/at90usb/irq.h b/nuttx/arch/avr/include/at90usb/irq.h
index c2f9db4e6..8e6412125 100644
--- a/nuttx/arch/avr/include/at90usb/irq.h
+++ b/nuttx/arch/avr/include/at90usb/irq.h
@@ -63,7 +63,7 @@
 #define AT90USB_IRQ_INT5     5  /* 0x000c External Interrupt Request 5 */
 #define AT90USB_IRQ_INT6     6  /* 0x000e External Interrupt Request 6 */
 #define AT90USB_IRQ_INT7     7  /* 0x0010 External Interrupt Request 7 */
-#define AT90USB_IRQ_PCINT0   8  /* 0x0012 PCINT0 Pin Change Interrupt Request 0 */
+#define AT90USB_IRQ_PCINT0   8  /* 0x0012 Pin Change Interrupt Request 0 */
 #define AT90USB_IRQ_USBGEN   9  /* 0x0014 USB General USB General Interrupt request */
 #define AT90USB_IRQ_USBEP   10  /* 0x0016 USB Endpoint/Pipe USB ENdpoint/Pipe Interrupt request */
 #define AT90USB_IRQ_WDT     11  /* 0x0018 Watchdog Time-out Interrupt */
diff --git a/nuttx/arch/avr/include/avr/irq.h b/nuttx/arch/avr/include/avr/irq.h
index 07b875a0a..b387be671 100644
--- a/nuttx/arch/avr/include/avr/irq.h
+++ b/nuttx/arch/avr/include/avr/irq.h
@@ -52,12 +52,46 @@
  ****************************************************************************/
 
 /* Register state save array indices */
- 
-#define REG_Rx           0 /* Just a placeholder */
 
-/* Size of the register state save array (in bytes?) */
-
-#define XCPTCONTEXT_REGS 1
+#define REG_SPH           0 /* Stack pointer on exception entry */
+#define REG_SPL           1
+#define REG_R27           2 /* r26-r27 */
+#define REG_R26           3
+#define REG_R31           4 /* r18-r31 */
+#define REG_R30           5
+#define REG_R29           6
+#define REG_R28           7
+#define REG_R25           8 /* r25 */
+#define REG_R23           9 /* r2-r23 */
+#define REG_R22          10
+#define REG_R21          11
+#define REG_R20          12
+#define REG_R19          13
+#define REG_R18          14
+#define REG_R17          15
+#define REG_R16          16
+#define REG_R15          17
+#define REG_R14          18
+#define REG_R13          19
+#define REG_R12          20
+#define REG_R11          21
+#define REG_R10          22
+#define REG_R9           23
+#define REG_R8           24
+#define REG_R7           25
+#define REG_R6           26
+#define REG_R5           27
+#define REG_R4           28
+#define REG_R3           29
+#define REG_R2           30
+#define REG_R1           31 /* r1 - the "zero" register */
+#define REG_SREG         32 /* Status register */
+#define REG_R0           33 /* r0 */
+#define REG_R24          34 /* r24 */
+
+/* Size of the register state save array (in bytes) */
+
+#define XCPTCONTEXT_REGS 35
 
 /****************************************************************************
  * Public Types
diff --git a/nuttx/arch/avr/include/avr/types.h b/nuttx/arch/avr/include/avr/types.h
index 2e30414c4..0ff769576 100644
--- a/nuttx/arch/avr/include/avr/types.h
+++ b/nuttx/arch/avr/include/avr/types.h
@@ -63,20 +63,20 @@
  * files
  */
 
-typedef signed char        _int8_t;
+typedef signed char        _int8_t;    /* char is 8-bits */
 typedef unsigned char      _uint8_t;
 
-typedef signed short       _int16_t;
-typedef unsigned short     _uint16_t;
+typedef signed int         _int16_t;   /* int is 16-bits */
+typedef unsigned int       _uint16_t;
 
-typedef signed int         _int32_t;
-typedef unsigned int       _uint32_t;
+typedef signed long         _int32_t;  /* long is 32-bits */
+typedef unsigned long      _uint32_t;
 
-typedef signed long long   _int64_t;
+typedef signed long long   _int64_t;   /* long long is 64-bits */
 typedef unsigned long long _uint64_t;
 #define __INT64_DEFINED
 
-/* A pointer is 4 bytes */
+/* A pointer is 2 bytes */
 
 typedef signed int         _intptr_t;
 typedef unsigned int       _uintptr_t;