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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-12-30 21:08:23 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-12-30 21:08:23 +0000 |
commit | 9f740c40ba0aabdc4501452e93d0a22524cb4c7d (patch) | |
tree | dd5696bdff3cc00d9b4115380394549197922e8f /nuttx/arch/z80 | |
parent | 3eb484bd4d79de731b743d9dccf9a2535b82699f (diff) | |
download | px4-nuttx-9f740c40ba0aabdc4501452e93d0a22524cb4c7d.tar.gz px4-nuttx-9f740c40ba0aabdc4501452e93d0a22524cb4c7d.tar.bz2 px4-nuttx-9f740c40ba0aabdc4501452e93d0a22524cb4c7d.zip |
Add support of other resets
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@464 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/z80')
-rw-r--r-- | nuttx/arch/z80/include/z80/irq.h | 13 | ||||
-rw-r--r-- | nuttx/arch/z80/src/common/up_head.asm | 130 | ||||
-rw-r--r-- | nuttx/arch/z80/src/common/up_initialstate.c | 3 | ||||
-rw-r--r-- | nuttx/arch/z80/src/common/up_internal.h | 2 |
4 files changed, 121 insertions, 27 deletions
diff --git a/nuttx/arch/z80/include/z80/irq.h b/nuttx/arch/z80/include/z80/irq.h index 12dd502c1..dbf61fe3e 100644 --- a/nuttx/arch/z80/include/z80/irq.h +++ b/nuttx/arch/z80/include/z80/irq.h @@ -51,8 +51,17 @@ /* Z80 Interrupts */ -#define Z80_IRQ_SYSTIMER (0) -#define NR_IRQS (1) +#define Z80_RST0 (0) +#define Z80_RST1 (1) +#define Z80_RST2 (2) +#define Z80_RST3 (3) +#define Z80_RST4 (4) +#define Z80_RST5 (5) +#define Z80_RST6 (6) +#define Z80_RST7 (7) + +#define Z80_IRQ_SYSTIMER Z80_RST7 +#define NR_IRQS (8) /* IRQ Stack Frame Format * diff --git a/nuttx/arch/z80/src/common/up_head.asm b/nuttx/arch/z80/src/common/up_head.asm index fd3bf20a1..3ebecda38 100644 --- a/nuttx/arch/z80/src/common/up_head.asm +++ b/nuttx/arch/z80/src/common/up_head.asm @@ -70,16 +70,12 @@ .area START (ABS)
.org 0x0000
- .globl _os_start
di ; Disable interrupts
- ld SP, #UP_STACK_END ; Set stack pointer
im 1 ; Set interrupt mode 1
- jp _os_start ; jump to the OS entry point
-forever:
- jp forever
+ jr _up_reset ; And boot the system
;**************************************************************************
-; Interrupt handler
+; Other reset handlers
;
; Interrupt mode 1 behavior:
;
@@ -92,12 +88,99 @@ forever: ;
;**************************************************************************
- .org 0x0038 ; Int mode 1
+ .org 0x0008 ; RST 1
+
+ ; Save AF on the stack, set the interrupt number and jump to the
+ ; common reset handling logic.
+ ; Offset 8: Return PC is already on the stack
+ push af ; Offset 7: AF (retaining flags)
+ ld a, #1 ; 1 = Z80_RST1
+ jr _up_rstcommon ; Remaining RST handling is common
+
+ .org 0x0010 ; RST 2
- ; Create a register frame. SP points to top of frame + 2, pushes
- ; decrement the stack pointer.
+ ; Save AF on the stack, set the interrupt number and jump to the
+ ; common reset handling logic.
; Offset 8: Return PC is already on the stack
push af ; Offset 7: AF (retaining flags)
+ ld a, #2 ; 2 = Z80_RST2
+ jr _up_rstcommon ; Remaining RST handling is common
+
+ .org 0x0018 ; RST 3
+
+ ; Save AF on the stack, set the interrupt number and jump to the
+ ; common reset handling logic.
+ ; Offset 8: Return PC is already on the stack
+ push af ; Offset 7: AF (retaining flags)
+ ld a, #3 ; 1 = Z80_RST3
+ jr _up_rstcommon ; Remaining RST handling is common
+
+ .org 0x0020 ; RST 4
+
+ ; Save AF on the stack, set the interrupt number and jump to the
+ ; common reset handling logic.
+ ; Offset 8: Return PC is already on the stack
+ push af ; Offset 7: AF (retaining flags)
+ ld a, #4 ; 1 = Z80_RST4
+ jr _up_rstcommon ; Remaining RST handling is common
+
+ .org 0x0028 ; RST 5
+
+ ; Save AF on the stack, set the interrupt number and jump to the
+ ; common reset handling logic.
+ ; Offset 8: Return PC is already on the stack
+ push af ; Offset 7: AF (retaining flags)
+ ld a, #5 ; 1 = Z80_RST5
+ jr _up_rstcommon ; Remaining RST handling is common
+
+ .org 0x0030 ; RST 6
+
+ ; Save AF on the stack, set the interrupt number and jump to the
+ ; common reset handling logic.
+ ; Offset 8: Return PC is already on the stack
+ push af ; Offset 7: AF (retaining flags)
+ ld a, #6 ; 1 = Z80_RST6
+ jr _up_rstcommon ; Remaining RST handling is common
+
+ .org 0x0038 ; Int mode 1 / RST 7
+
+ ; Save AF on the stack, set the interrupt number and jump to the
+ ; common reset handling logic.
+ ; Offset 8: Return PC is already on the stack
+ push af ; Offset 7: AF (retaining flags)
+ ld a, #7 ; 7 = Z80_RST7
+ jr _up_rstcommon ; Remaining RST handling is common
+
+;**************************************************************************
+; NMI interrupt handler
+;**************************************************************************
+
+ .org 0x0066
+ retn
+
+;**************************************************************************
+; System start logic
+;**************************************************************************
+
+_up_reset:
+ ld SP, #UP_STACK_END ; Set stack pointer
+ jp _os_start ; jump to the OS entry point
+forever:
+ jp forever
+
+;**************************************************************************
+; Common Interrupt handler
+;**************************************************************************
+
+_up_rstcommon:
+ ; Create a register frame. SP points to top of frame + 4, pushes
+ ; decrement the stack pointer. Already have
+ ;
+ ; Offset 8: Return PC is already on the stack
+ ; Offset 7: AF (retaining flags)
+ ;
+ ; IRQ number is in A
+
push hl ; Offset 6: HL
ld hl, #(3*2) ; HL is the value of the stack pointer before
add hl, sp ; the interrupt occurred
@@ -107,21 +190,24 @@ forever: push de ; Offset 2: DE
push bc ; Offset 1: BC
+ ld b, a ; Save the reset number in B
ld a, i ; Carry bit holds interrupt state
push af ; Offset 0: I with interrupt state in carry
di
; Call the interrupt decode logic. SP points to the beggining of the reg structure
- ld hl, #0 ; Argument is the beginning of the reg structure
+ ld hl, #0 ; Argument #2 is the beginning of the reg structure
add hl, sp ;
- push hl ; Place argument at the top of thest
+ push hl ; Place argument #2 at the top of stack
+ push bc ; Argument #1 is the Reset number
+ inc sp ; (make byte sized)
call _up_decodeirq ; Decode the IRQ
; On return, HL points to the beginning of the reg structure to restore
- ; Note that (1) the argument pushed on the stack is not popped, and (2) the
+ ; Note that (1) the arguments pushed on the stack are not popped, and (2) the
; original stack pointer is lost. In the normal case (no context switch),
- ; HL will contain the value of the SP before the argument was pushed.
+ ; HL will contain the value of the SP before the arguments wer pushed.
ld sp, hl ; Use the new stack pointer
@@ -129,21 +215,24 @@ forever: ex af, af' ; Select alternate AF
pop af ; Offset 0: AF' = I with interrupt state in carry
+ ex af, af' ; Restore original AF
pop bc ; Offset 1: BC
pop de ; Offset 2: DE
pop ix ; Offset 3: IX
pop iy ; Offset 4: IY
exx ; Use alternate BC/DE/HL
- pop hl ; Offset 5: HL' = Stack pointer at time of interrupt
- exx
+ ld hl, #-2 ; Offset of SP to account for ret addr on stack
+ pop de ; Offset 5: HL' = Stack pointer after return
+ add hl, de ; HL = Stack pointer value before return
+ exx ; Restore original BC/DE/HL
pop hl ; Offset 6: HL
pop af ; Offset 7: AF
; Restore the stack pointer
- exx
- ld sp, hl
- exx
+ exx ; Use alternate BC/DE/HL
+ ld sp, hl ; Set SP = saved stack pointer value before return
+ exx ; Restore original BC/DE/HL
; Restore interrupt state
@@ -156,11 +245,6 @@ nointenable: ex af, af' ; Restore AF
reti
-;**************************************************************************
-; NMI interrupt handler
-;**************************************************************************
- .org 0x0066
- retn
diff --git a/nuttx/arch/z80/src/common/up_initialstate.c b/nuttx/arch/z80/src/common/up_initialstate.c index aa3090367..0e26af9a2 100644 --- a/nuttx/arch/z80/src/common/up_initialstate.c +++ b/nuttx/arch/z80/src/common/up_initialstate.c @@ -43,6 +43,7 @@ #include <string.h> #include <nuttx/arch.h> +#include "chip/chip.h" #include "up_internal.h" #include "up_arch.h" @@ -84,7 +85,7 @@ void up_initial_state(_TCB *tcb) memset(xcp, 0, sizeof(struct xcptcontext)); #ifndef CONFIG_SUPPRESS_INTERRUPTS - xcp->regs[XCPT_I] = 0x0001; /* Carry flag will enable interrupts */ + xcp->regs[XCPT_I] = Z80_C_FLAG; /* Carry flag will enable interrupts */ #endif xcp->regs[XCPT_SP] = (uint16)tcb->adj_stack_ptr; xcp->regs[XCPT_PC] = (uint16)tcb->start; diff --git a/nuttx/arch/z80/src/common/up_internal.h b/nuttx/arch/z80/src/common/up_internal.h index 89e334b36..7b0ba4474 100644 --- a/nuttx/arch/z80/src/common/up_internal.h +++ b/nuttx/arch/z80/src/common/up_internal.h @@ -107,7 +107,7 @@ extern int up_restoreusercontext(chipreg_t *regs); /* Supplied by board-specific logic */ -extern FAR chipreg_t *up_decodeirq(FAR chipreg_t *regs); +extern FAR chipreg_t *up_decodeirq(uint8 rstno, FAR chipreg_t *regs); extern void up_irqinitialize(void); extern int up_timerisr(int irq, FAR chipreg_t *regs); extern void up_lowputc(char ch) __naked; |