/*
* $Log$
+ * Revision 1.3 2004/07/30 14:24:16 rasky
+ * Task switching con salvataggio perfetto stato di interrupt (SR)
+ * Kernel monitor per dump informazioni su stack dei processi
+ *
* Revision 1.2 2004/06/03 11:27:09 bernie
* Add dual-license information.
*
asm void asm_switch_context(void ** new_sp, void ** save_sp)
{
lea (SP)+
- move n,x:(SP)+
- move x0,x:(SP)+
- move y0,x:(SP)+
- move y1,x:(SP)+
- move a0,x:(SP)+
- move a1,x:(SP)+
- move a2,x:(SP)+
- move b0,x:(SP)+
- move b1,x:(SP)+
- move b2,x:(SP)+
- move r0,x:(SP)+
- move r1,x:(SP)+
- move r2,x:(SP)+
- move r3,x:(SP)+
-
- move omr,x:(SP)+
- move la,x:(SP)+
- move m01,x:(SP)+
- move lc,x:(SP)+
-
- ;
- ; save hardware stack
- ;
- move hws,x:(SP)+
- move hws,x:(SP)+
; From the manual:
; The compiler uses page 0 address locations X: 0x0030 - 0x003F as register
move y1,x:(SP)
;
- ; 28 words have been pushed on the stack.
+ ; Switch stacks
nop
move SP, x:(R3)
nop
move x:(R2), SP
nop
+ ;
+ ; restore all saved registers
+ ;
pop y1
move y1,x:<$3F
pop y1
pop y1
move y1,x:<$38
- ;
- ; restore hardware stack
- ;
- move hws,la ; Clear HWS to ensure proper reload
- move hws,la
- pop HWS
- pop HWS
-
- ;
- ; restore all saved registers
- ;
- pop lc
- pop m01
- pop la
- pop omr
-
- pop r3
- pop r2
- pop r1
- pop r0
- pop b2
- pop b1
- pop b0
- pop a2
- pop a1
- pop a0
-
- pop y1
- pop y0
- pop x0
+ ; SR is already pushed on the stack (normal call context). Use RTI to restore
+ ; it, so that interrupt status is preserved across the tasks.
+ rti
+}
- pop n
-
- rts
+int asm_switch_version(void);
+int asm_switch_version(void)
+{
+ return 1;
}