dev: created cold/warm boot entry points and stubs

Makefile

@@ -17,10 +17,13 @@ vectorTable.o: vectorTable.asm
 zone.o: zone.asm
 	$(ASM) $(ASMFLAGS) -o $@ $<
 
-zone.hex: float.o vectorTable.o zone.o linker.cmd
-	$(LINK) $(LINKFLAGS) -o $@ float.o vectorTable.o zone.o
+boot.o: boot.asm
+	$(ASM) $(ASMFLAGS) -o $@ $<
+
+zone.hex: float.o vectorTable.o zone.o boot.o linker.cmd
+	$(LINK) $(LINKFLAGS) -o $@ float.o vectorTable.o zone.o boot.o
 
 clean:
-	rm -f float.o vectorTable.o zone.o zone.hex
+	rm -f float.o vectorTable.o zone.o boot.o zone.hex
 
 .PHONY: all clean

boot.asm

@@ -1,2 +1,13 @@
 ; SPDX-License-Identifier: MPL-2.0
 ; SPDX-FileCopyrightText: (c) 2025 A.M. Rowsell
+.section "boot","acrx"
+.global zone_setup
+.global os_warm_boot
+.extern os_main_loop
+
+zone_setup:
+    ld sp, 0x6FFF
+    jp os_main_loop
+
+os_warm_boot:
+    ret

linker.cmd

@@ -3,6 +3,7 @@
 SECTIONS
 {
   .zone     0xA000 : { *(.zone) *(zone) }
+  .boot     0xC3C3 : { *(.boot) *(boot) }
   .text     0xE000 : { *(.text) *(.float) *(float) }
   .vectors  0xF000 : { *(.vectors) }
   .data     0x7000 : { *(.data) }

vectorTable.asm

@@ -14,4 +14,5 @@ os_vectors:
     .word os_getch_vec
     .word os_outbyte_vec
     .word os_inbyte_vec
-    .zero 248
+    .word os_warm_boot
+    .zero 246

zone.asm

@@ -9,6 +9,7 @@
 .global os_getch_vec
 .global os_outbyte_vec
 .global os_inbyte_vec
+.global os_main_loop
 
 zone_start:
     ret
@@ -24,3 +25,6 @@ os_outbyte_vec:
 
 os_inbyte_vec:
     ret
+
+os_main_loop:
+    jp os_main_loop