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Alfred Gedeon
alfred gedeon
parent
a5dbc2b1de
commit
718178c68a
406 changed files with 108795 additions and 106323 deletions
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@ -46,41 +46,40 @@ void portSWITCH_CONTEXT( void );
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void portFIRST_CONTEXT( void );
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/* There are slightly different versions depending on whether you are building
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to include debugger information. If debugger information is used then there
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are a couple of extra bytes left of the ISR stack (presumably for use by the
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debugger). The true stack pointer is then stored in the bp register. We add
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2 to the stack pointer to remove the extra bytes before we restore our context. */
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* to include debugger information. If debugger information is used then there
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* are a couple of extra bytes left of the ISR stack (presumably for use by the
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* debugger). The true stack pointer is then stored in the bp register. We add
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* 2 to the stack pointer to remove the extra bytes before we restore our context. */
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#define portSWITCH_CONTEXT() \
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asm { mov ax, seg pxCurrentTCB } \
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asm { mov ds, ax } \
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asm { les bx, pxCurrentTCB } /* Save the stack pointer into the TCB. */ \
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asm { mov es:0x2[ bx ], ss } \
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asm { mov es:[ bx ], sp } \
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asm { call far ptr vTaskSwitchContext } /* Perform the switch. */ \
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asm { mov ax, seg pxCurrentTCB } /* Restore the stack pointer from the TCB. */ \
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asm { mov ds, ax } \
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asm { les bx, dword ptr pxCurrentTCB } \
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asm { mov ss, es:[ bx + 2 ] } \
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asm { mov sp, es:[ bx ] }
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#define portSWITCH_CONTEXT() \
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asm { mov ax, seg pxCurrentTCB } \
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asm { mov ds, ax } \
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asm { les bx, pxCurrentTCB } /* Save the stack pointer into the TCB. */ \
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asm { mov es : 0x2[ bx ], ss } \
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asm { mov es:[ bx ], sp } \
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asm { call far ptr vTaskSwitchContext } /* Perform the switch. */ \
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asm { mov ax, seg pxCurrentTCB } /* Restore the stack pointer from the TCB. */ \
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asm { mov ds, ax } \
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asm { les bx, dword ptr pxCurrentTCB } \
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asm { mov ss, es:[ bx + 2 ] } \
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asm { mov sp, es:[ bx ] }
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#define portFIRST_CONTEXT() \
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__asm { mov ax, seg pxCurrentTCB } \
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__asm { mov ds, ax } \
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__asm { les bx, dword ptr pxCurrentTCB } \
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__asm { mov ss, es:[ bx + 2 ] } \
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__asm { mov sp, es:[ bx ] } \
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__asm { pop bp } \
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__asm { pop di } \
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__asm { pop si } \
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__asm { pop ds } \
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__asm { pop es } \
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__asm { pop dx } \
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__asm { pop cx } \
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__asm { pop bx } \
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__asm { pop ax } \
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__asm { iret }
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#define portFIRST_CONTEXT() \
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__asm { mov ax, seg pxCurrentTCB } \
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__asm { mov ds, ax } \
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__asm { les bx, dword ptr pxCurrentTCB } \
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__asm { mov ss, es:[ bx + 2 ] } \
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__asm { mov sp, es:[ bx ] } \
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__asm { pop bp } \
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__asm { pop di } \
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__asm { pop si } \
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__asm { pop ds } \
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__asm { pop es } \
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__asm { pop dx } \
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__asm { pop cx } \
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__asm { pop bx } \
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__asm { pop ax } \
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__asm { iret }
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#endif
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#endif /* ifndef PORT_ASM_H */
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@ -25,16 +25,16 @@
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*/
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/*
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Changes from V1.00:
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+ pxPortInitialiseStack() now initialises the stack of new tasks to the
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same format used by the compiler. This allows the compiler generated
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interrupt mechanism to be used for context switches.
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Changes from V2.6.1
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+ Move usPortCheckFreeStackSpace() to tasks.c.
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*/
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* Changes from V1.00:
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*
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+ pxPortInitialiseStack() now initialises the stack of new tasks to the
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+ same format used by the compiler. This allows the compiler generated
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+ interrupt mechanism to be used for context switches.
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+
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+ Changes from V2.6.1
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+
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+ Move usPortCheckFreeStackSpace() to tasks.c.
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*/
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#include <dos.h>
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@ -44,76 +44,79 @@ Changes from V2.6.1
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/*-----------------------------------------------------------*/
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/* See header file for description. */
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StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
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StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
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TaskFunction_t pxCode,
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void * pvParameters )
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{
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StackType_t DS_Reg = 0;
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StackType_t DS_Reg = 0;
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/* Place a few bytes of known values on the bottom of the stack.
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This is just useful for debugging. */
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/* Place a few bytes of known values on the bottom of the stack.
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* This is just useful for debugging. */
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*pxTopOfStack = 0x1111;
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pxTopOfStack--;
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*pxTopOfStack = 0x2222;
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pxTopOfStack--;
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*pxTopOfStack = 0x3333;
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pxTopOfStack--;
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*pxTopOfStack = 0x4444;
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pxTopOfStack--;
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*pxTopOfStack = 0x5555;
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pxTopOfStack--;
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*pxTopOfStack = 0x1111;
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pxTopOfStack--;
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*pxTopOfStack = 0x2222;
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pxTopOfStack--;
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*pxTopOfStack = 0x3333;
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pxTopOfStack--;
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*pxTopOfStack = 0x4444;
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pxTopOfStack--;
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*pxTopOfStack = 0x5555;
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pxTopOfStack--;
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/*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */
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/*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */
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/* We are going to start the scheduler using a return from interrupt
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instruction to load the program counter, so first there would be the
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function call with parameters preamble. */
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*pxTopOfStack = FP_SEG( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* We are going to start the scheduler using a return from interrupt
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* instruction to load the program counter, so first there would be the
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* function call with parameters preamble. */
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/* Next the status register and interrupt return address. */
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*pxTopOfStack = portINITIAL_SW;
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pvParameters );
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* The remaining registers would be pushed on the stack by our context
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switch function. These are loaded with values simply to make debugging
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easier. */
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*pxTopOfStack = ( StackType_t ) 0xAAAA; /* AX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xCCCC; /* CX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xEEEE; /* ES */
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pxTopOfStack--;
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/* Next the status register and interrupt return address. */
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*pxTopOfStack = portINITIAL_SW;
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pxTopOfStack--;
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*pxTopOfStack = FP_SEG( pxCode );
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pxTopOfStack--;
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*pxTopOfStack = FP_OFF( pxCode );
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pxTopOfStack--;
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/* We need the true data segment. */
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__asm{ MOV DS_Reg, DS };
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/* The remaining registers would be pushed on the stack by our context
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* switch function. These are loaded with values simply to make debugging
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* easier. */
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*pxTopOfStack = ( StackType_t ) 0xAAAA; /* AX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xCCCC; /* CX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DX */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xEEEE; /* ES */
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pxTopOfStack--;
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*pxTopOfStack = DS_Reg; /* DS */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x0123; /* SI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BP */
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/* We need the true data segment. */
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__asm {
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MOV DS_Reg, DS
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};
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/*lint +e950 +e611 +e923 */
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*pxTopOfStack = DS_Reg; /* DS */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0x0123; /* SI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xDDDD; /* DI */
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pxTopOfStack--;
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*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BP */
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return pxTopOfStack;
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/*lint +e950 +e611 +e923 */
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return pxTopOfStack;
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}
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/*-----------------------------------------------------------*/
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