Integrating z80
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@463 42af7a65-404d-4744-a932-0658087f49c3
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TODO
2
TODO
@ -231,7 +231,7 @@ o Build system
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Priority: Low
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Description: Dependencies do not work correctly under configs/<board>/src
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(same as arch/<arch>/src/board).
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(same as arch/<arch>/src/board) with SDCC.
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Status: Open
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Priority: Medium
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@ -51,7 +51,7 @@
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/* Z80 Interrupts */
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#define Z80_IRQ_SYSTIMER (1)
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#define Z80_IRQ_SYSTIMER (0)
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#define NR_IRQS (1)
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/* IRQ Stack Frame Format
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@ -111,15 +111,22 @@ forever:
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push af ; Offset 0: I with interrupt state in carry
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di
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; Call the interrupt decode logic. SP points to the beggining of the reg structure
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; Call the interrupt decode logic. SP points to the beggining of the reg structure
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ld hl, #0 ; Argument is the beginning of the reg structure
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add hl, sp ;
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push hl ;
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push hl ; Place argument at the top of thest
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call _up_decodeirq ; Decode the IRQ
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; On return, HL points to the beginning of the reg structure to restore
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; Note that (1) the argument pushed on the stack is not popped, and (2) the
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; original stack pointer is lost. In the normal case (no context switch),
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; HL will contain the value of the SP before the argument was pushed.
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ld sp, hl ; Use the new stack pointer
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; Restore registers. HL points to the beginning of the reg structure to restore
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ld sp, hl ; Use the temp stack pointer
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ex af, af' ; Select alternate AF
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pop af ; Offset 0: AF' = I with interrupt state in carry
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pop bc ; Offset 1: BC
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@ -92,13 +92,14 @@ irqstate_t irqsave(void) __naked
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void irqrestore(irqstate_t flags) __naked
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{
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_asm
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di ; Assume disabled
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pop hl ; HL = return address
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pop af ; AF Carry bit hold interrupt state
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jr nc, statedisable
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ei
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ret
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statedisable:
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di
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ret
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push af ; Restore stack
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push hl ;
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ret ; and return
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_endasm;
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}
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@ -45,6 +45,15 @@
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* Definitions
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************************************************************************************/
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/* Bits in the Z80 FLAGS register */
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#define Z80_C_FLAG 0x01 /* Bit 0: Carry flag */
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#define Z80_N_FLAG 0x02 /* Bit 1: Add/Subtract flag */
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#define Z80_PV_FLAG 0x04 /* Bit 2: Parity/Overflow flag */
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#define Z80_H_FLAG 0x10 /* Bit 4: Half carry flag */
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#define Z80_Z_FLAG 0x40 /* Bit 5: Zero flag */
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#define Z80_S_FLAG 0x80 /* Bit 7: Sign flag */
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/************************************************************************************
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* Public Function Prototypes
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************************************************************************************/
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@ -285,5 +285,5 @@ CONFIG_CUSTOM_STACK=n
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CONFIG_PROC_STACK_SIZE=1024
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CONFIG_PTHREAD_STACK_MIN=
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CONFIG_PTHREAD_STACK_DEFAULT=
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CONFIG_HEAP_SIZE=32768
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CONFIG_HEAP_BASE=CONFIG_DRAM_SIZE-CONFIG_HEAP_SIZE
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CONFIG_HEAP_SIZE=
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CONFIG_HEAP_BASE=
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@ -76,10 +76,21 @@ void up_irqinitialize(void)
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current_regs = NULL;
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/* And finally, enable interrupts */
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/* Attach the timer interrupt -- There is not special timer interrupt
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* enable in the simulation so it must be enabled here before interrupts
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* are enabled.
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*
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* NOTE: Normally, there are seperate enables for "global" interrupts
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* and specific device interrupts. In such a "normal" case, the timer
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* interrupt should be attached and enabled in the the function up_timerinit()
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*/
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irq_attach(Z80_IRQ_SYSTIMER, (xcpt_t)up_timerisr);
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/* And finally, enable interrupts (including the timer) */
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#ifndef CONFIG_SUPPRESS_INTERRUPTS
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irqrestore(TRUE);
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irqrestore(Z80_C_FLAG);
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#endif
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}
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@ -93,7 +104,7 @@ void up_irqinitialize(void)
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void up_disable_irq(int irq)
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{
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irqrestore(FALSE);
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irqrestore(0);
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}
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/****************************************************************************
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@ -91,5 +91,6 @@ int up_timerisr(int irq, FAR chipreg_t *regs)
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void up_timerinit(void)
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{
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/* The timer interrupt was attached in up_irqinitialize -- see comments there */
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}
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@ -268,7 +268,7 @@ typedef struct _TCB _TCB;
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/* This is the callback type used by sched_foreach() */
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typedef void (sched_foreach_t)(FAR _TCB *tcb, FAR void *arg);
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typedef void (*sched_foreach_t)(FAR _TCB *tcb, FAR void *arg);
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#endif /* __ASSEMBLY__ */
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@ -162,7 +162,7 @@ void mm_addregion(FAR void *heapstart, size_t heapsize)
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heapend = MM_ALIGN_DOWN((size_t)heapstart + (size_t)heapsize);
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heapsize = heapend - heapbase;
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mlldbg("Region %d: base=%p size=%d\n", IDX+1, heapstart, heapsize);
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mlldbg("Region %d: base=%p size=%u\n", IDX+1, heapstart, heapsize);
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/* Add the size of this region to the total size of the heap */
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