linker script

Makefile

@@ -2,7 +2,7 @@ MACHINE = mac99
 PPC = powerpc-eabi
 QEMU = qemu-system-ppc
 RES = 1600x900x32
-
+CPU = g4
 SOURCES_C = $(shell find src -name "*.c")
 SOURCES_S = $(shell find src -name "*.s")
 OBJECTS = $(SOURCES_C:.c=.elf) $(SOURCES_S:.s=.elf)
@@ -26,8 +26,8 @@ bootinfo.txt: loader/load.fth loader/def.fth
 	cat loader/load.fth >> bootinfo.txt
 	echo "</boot-script></chrp-boot>" >> bootinfo.txt
 
-kernel.elf: $(OBJECTS)
-	$(PPC)-ld -Ttext=0x02000000 -Tdata=0x02100000 $^ -o $@
+kernel.elf: linker.ld $(OBJECTS)
+	$(PPC)-ld -T $^ -o $@
 
 %.elf: %.c
 	$(PPC)-gcc -I include -c $< -o $@
@@ -40,7 +40,9 @@ clean:
 	find src -name "*.elf" -type f -delete
 
 run:
-	$(QEMU) -hda *.APM -g $(RES) -machine $(MACHINE)
+	$(QEMU) -hda *.APM -g $(RES) -machine $(MACHINE) -cpu $(CPU)
 
 debug:
-	$(QEMU) -hda *.APM -d in_asm -g $(RES) -machine $(MACHINE)
+	$(QEMU) -hda *.APM -d in_asm -g $(RES) -machine $(MACHINE) -cpu $(CPU)
+gdb:
+	$(QEMU) -hda *.APM -s -S -g $(RES) -machine $(MACHINE) -cpu $(CPU)

linker.ld

@@ -0,0 +1,21 @@
+ENTRY(_start)
+
+SECTIONS
+{
+        . = 0x02000000;
+        .text BLOCK(4K) : ALIGN(4K)
+        {
+                *(.text)
+        }
+	. = 0x02100000;
+        .data BLOCK(4K) : ALIGN(4K)
+        {
+
+		*(.rodata)
+                *(.data)
+        }
+        .bss BLOCK(4K) (NOLOAD) : ALIGN(4K)
+        {
+                *(.bss)
+        }
+}

loader/def.fth

@@ -3,7 +3,7 @@
 : inf dup sup 1 + ; 
 : diff = if 0 else -1 then ;
 : fba frame-buffer-adr ;
-: beige-vram 80000000 ; : mac99-vram 81000000 ;
+: beige-fba 80000000 ; : mac99-fba 81000000 ;
 : hardware-error ." Hardware not supported." cr ;
 : beige-message  ." Beige hardware detected" cr ;
 : mac99-message  ." mac99 hardware detected" cr ;

loader/load.fth

@@ -1,12 +1,12 @@
 initmsg
-fba beige-vram = if beige-message beige-magic-number beige-vram c! then 
-fba mac99-vram = if mac99-message mac99-magic-number mac99-vram c! then
-fba beige-vram = if screen-width  4 beige-vram + l! then
-fba beige-vram = if screen-height 8 beige-vram + l! then
-fba mac99-vram = if screen-width  4 mac99-vram + l! then
-fba mac99-vram = if screen-height 8 mac99-vram + l! then
+fba beige-fba = if beige-message beige-magic-number beige-fba c! then 
+fba mac99-fba = if mac99-message mac99-magic-number mac99-fba c! then
+fba beige-fba = if screen-width  4 beige-fba + l! then
+fba beige-fba = if screen-height 8 beige-fba + l! then
+fba mac99-fba = if screen-width  4 mac99-fba + l! then
+fba mac99-fba = if screen-height 8 mac99-fba + l! then
 variable run
 -1 run !
-fba beige-vram diff fba mac99-vram diff and if hardware-error 0 run ! then
+fba beige-fba diff fba mac99-fba diff and if hardware-error 0 run ! then
 run @ 0 = if 1 0 do 0 +loop then
 boot hd:,\boot\kernel.elf

src/entry/boot.c

@@ -13,6 +13,7 @@ void __eabi(void)
 //void* ofw_interpret(char* cmd, int32_t* stack_args, int n_stack_args, int n_ret_args, int32_t* reta
 void main(void)
 {
+	ofw_interpret("show-devs", 0, 0, 0, 0);
 	puts("Press any key to continue", 25);
 	ofw_interpret("blink-screen", 0, 0, 0, 0);
 	ofw_interpret("key", 0, 0, 1, (int32_t*)0x03020000);