User:Primis: Difference between revisions
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== Initial Setup == |
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In order to make our kernel work, we must be able to compile it, and link it. |
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We have two different ways of building our code, the *NIX way with a [[Makefile]], and the Windows way with a [[Batch]] file. |
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First is the Makefile: |
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<pre> |
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# Makefile for our kernel |
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# This is designed for *NIX and Cygwin systems |
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# Use build.BAT for windows systems |
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# Requires GCC and NASM |
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# Based on JamesM's Kernel Tutorials |
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SOURCES=boot.o main.o |
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CFLAGS=-nostdlib -nostdinc -fno-builtin |
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LDFLAGS=-Tlink.ld |
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ASFLAGS=-felf |
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all: |
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$(SOURCES) link |
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clean: |
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-rm *.o kernel |
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link: |
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ld $(LDFLAGS) -o kernel $(SOURCES) |
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.s.o: |
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nasm $(ASFLAGS) $< |
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</pre> |
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The basics are all quite simple, the only rule specifically changed is the assembler, which we've changed from [[GAS]] to [[NASM]], |
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The reason quite simply, Intel Syntax is more widely preferred over AT&T syntax in the [[x86]] [[Assembly]] world. |
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<source lang="c"> |
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// main.c -- Called from assembly, this is our main function. |
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int k_main() // We call this k_main() so we don't get main() warnings. |
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{ |
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return (0xDEADBEEF); |
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} |
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</source> |
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