Add raspi_os here

Eventually this is gonna be part of Ferrocyanide

ferrocyanide/raspi_os/Makefile

@@ -0,0 +1,12 @@
+
+all: process
+
+process:
+	arm-none-eabi-as -I asm -o main.o main.s
+	arm-none-eabi-ld --no-undefined main.o -Map kernel.map -o output.elf -T kernel.ld
+	arm-none-eabi-objcopy output.elf -O binary kernel.img
+
+clean:
+	rm -f main.o
+	rm -f output.elf
+	rm -f kernel.img

ferrocyanide/raspi_os/kernel.ld

@@ -0,0 +1,38 @@
+/******************************************************************************
+*	kernel.ld
+*	 by Alex Chadwick
+*
+*	A linker script for generation of raspberry pi kernel images.
+******************************************************************************/
+
+SECTIONS {
+	/*
+	* First and formost we need the .init section, containing the code to
+        * be run first. We allow room for the ATAGs and stack and conform to
+        * the bootloader's expectation by putting this code at 0x8000.
+	*/
+	.init 0x8000 : {
+		*(.init)
+	}
+	/*
+	* Next we put the rest of the code.
+	*/
+	.text : {
+		*(.text)
+	}
+
+	/*
+	* Next we put the data.
+	*/
+	.data : {
+		*(.data)
+	}
+
+	/*
+	* Finally comes everything else. A fun trick here is to put all other
+	* sections into this section, which will be discarded by default.
+	*/
+	/DISCARD/ : {
+		*(*)
+	}
+}

ferrocyanide/raspi_os/kernel.map

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+
+Discarded input sections
+
+ .bss           0x0000000000000000        0x0 main.o
+ .ARM.attributes
+                0x0000000000000000       0x14 main.o
+
+Memory Configuration
+
+Name             Origin             Length             Attributes
+*default*        0x0000000000000000 0xffffffffffffffff
+
+Linker script and memory map
+
+LOAD main.o
+
+.init           0x0000000000008000       0x50
+ *(.init)
+ .init          0x0000000000008000       0x50 main.o
+                0x0000000000008000                _start
+
+.text           0x0000000000008050        0x0
+ *(.text)
+ .text          0x0000000000008050        0x0 main.o
+
+.data           0x0000000000008050        0x0
+ *(.data)
+ .data          0x0000000000008050        0x0 main.o
+
+/DISCARD/
+ *(*)
+OUTPUT(output.elf elf32-littlearm)

ferrocyanide/raspi_os/main.s

@@ -0,0 +1,36 @@
+.section .init
+
+.globl _start
+
+_start:
+    ldr r0,=0x20200000 //GPIO controller address
+
+    mov r1, #1  // put 1 into r1
+    lsl r1, #18 //logical shift left by 18
+    str r1, [r0, #4] //store register
+
+    loop:
+        mov r1, #1
+        lsl r1, #16 //set pin 16
+        str r1, [r0, #40] // toggle GPIO on
+
+        mov r2, #0x3f0000
+    wait:
+        sub r2, #1
+        cmp r2, #0
+        bne wait
+
+    mov r1, #1
+    lsl r1, #16 //set pin 16
+    str r1, [r0, #28] // toggle GPIO ofrf
+
+        mov r2, #0x3f0000
+    wait2:
+        sub r2, #1
+        cmp r2, #0
+        bne wait2
+    b loop
+
+
+
+

ferrocyanide/raspi_os/template/LICENSE

@@ -0,0 +1,22 @@
+Copyright (c) 2012 Alex Chadwick
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.

ferrocyanide/raspi_os/template/Makefile

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+###############################################################################
+#	makefile
+#	 by Alex Chadwick
+#
+#	A makefile script for generation of raspberry pi kernel images.
+###############################################################################
+
+# The toolchain to use. arm-none-eabi works, but there does exist 
+# arm-bcm2708-linux-gnueabi.
+ARMGNU ?= arm-none-eabi
+
+# The intermediate directory for compiled object files.
+BUILD = build/
+
+# The directory in which source files are stored.
+SOURCE = source/
+
+# The name of the output file to generate.
+TARGET = kernel.img
+
+# The name of the assembler listing file to generate.
+LIST = kernel.list
+
+# The name of the map file to generate.
+MAP = kernel.map
+
+# The name of the linker script to use.
+LINKER = kernel.ld
+
+# The names of all object files that must be generated. Deduced from the 
+# assembly code files in source.
+OBJECTS := $(patsubst $(SOURCE)%.s,$(BUILD)%.o,$(wildcard $(SOURCE)*.s))
+
+# Rule to make everything.
+all: $(TARGET) $(LIST)
+
+# Rule to remake everything. Does not include clean.
+rebuild: all
+
+# Rule to make the listing file.
+$(LIST) : $(BUILD)output.elf
+	$(ARMGNU)-objdump -d $(BUILD)output.elf > $(LIST)
+
+# Rule to make the image file.
+$(TARGET) : $(BUILD)output.elf
+	$(ARMGNU)-objcopy $(BUILD)output.elf -O binary $(TARGET) 
+
+# Rule to make the elf file.
+$(BUILD)output.elf : $(OBJECTS) $(LINKER)
+	$(ARMGNU)-ld --no-undefined $(OBJECTS) -Map $(MAP) -o $(BUILD)output.elf -T $(LINKER)
+
+# Rule to make the object files.
+$(BUILD)%.o: $(SOURCE)%.s $(BUILD)
+	$(ARMGNU)-as -I $(SOURCE) $< -o $@
+
+$(BUILD):
+	mkdir $@
+
+# Rule to clean files.
+clean : 
+	-rm -rf $(BUILD)
+	-rm -f $(TARGET)
+	-rm -f $(LIST)
+	-rm -f $(MAP)

ferrocyanide/raspi_os/template/kernel.ld

@@ -0,0 +1,39 @@
+/******************************************************************************
+*	kernel.ld
+*	 by Alex Chadwick
+*
+*	A linker script for generation of raspberry pi kernel images.
+******************************************************************************/
+
+SECTIONS {
+	/*
+	* First and formost we need the .init section, containing the code to 
+        * be run first. We allow room for the ATAGs and stack and conform to 
+        * the bootloader's expectation by putting this code at 0x8000.
+	*/
+	.init 0x8000 : {
+		*(.init)
+	}
+	
+	/* 
+	* Next we put the rest of the code.
+	*/
+	.text : {
+		*(.text)
+	}
+	
+	/* 
+	* Next we put the data.
+	*/
+	.data : {
+		*(.data)
+	}
+
+	/*
+	* Finally comes everything else. A fun trick here is to put all other 
+	* sections into this section, which will be discarded by default.
+	*/
+	/DISCARD/ : {
+		*(*)
+	}
+}