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https://github.com/isometimes/rpi4-osdev
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Merge branch 'master' of https://github.com/LabNelson/rpi4-osdev
This commit is contained in:
commit
c71a1cc18a
13 changed files with 24 additions and 25 deletions
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@ -4,7 +4,7 @@ Writing a "bare metal" operating system for Raspberry Pi 4
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Introduction
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------------
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As a tech CEO @RealVNC, I don't write code any more. And I've recently realised just how much I miss it.
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As a tech CEO, I don't write code any more. And I've recently realised just how much I miss it.
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Currently in the throes of a nationwide "lockdown" due to Covid-19 (and having been spared my usual commute), I've found myself with more hours in the day. I have taken this time for myself and used it to fulfil a childhood ambition - to write a **bare metal** operating system that runs on commercial hardware.
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@ -19,8 +19,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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@ -1,9 +1,8 @@
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CFILES = $(wildcard *.c lib/*.c)
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OFILES = $(CFILES:.c=.o)
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GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib
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GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
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GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
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all: clean kernel8.img
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boot/boot.o: boot/boot.S
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@ -19,8 +19,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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@ -19,8 +19,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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@ -19,8 +19,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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@ -19,8 +19,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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@ -17,8 +17,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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@ -18,8 +18,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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@ -18,8 +18,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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@ -18,8 +18,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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@ -18,8 +18,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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@ -19,8 +19,8 @@ enum {
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enum {
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Pull_None = 0,
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Pull_Down = 1, // Are down and up the right way around?
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Pull_Up = 2
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Pull_Down = 2,
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Pull_Up = 1
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};
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void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }
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