jordan/rpi4-osdev
1
0
Fork 0
mirror of https://github.com/isometimes/rpi4-osdev synced 2024-11-09 20:00:40 +00:00
Code Issues Projects Releases Packages Wiki Activity

Merge branch 'master' of https://github.com/LabNelson/rpi4-osdev

Browse source
This commit is contained in:
Nelson Ehling 2024-03-27 12:51:32 +01:00
commit c71a1cc18a
13 changed files with 24 additions and 25 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
README.md
View file

@ -4,7 +4,7 @@ Writing a "bare metal" operating system for Raspberry Pi 4
Introduction Introduction
------------ ------------
As a tech CEO @RealVNC, I don't write code any more. And I've recently realised just how much I miss it. As a tech CEO, I don't write code any more. And I've recently realised just how much I miss it.
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. 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.

4
part10-multicore/io.c
View file

@ -19,8 +19,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }

3
part11-breakout-smp/Makefile.gcc
View file

@ -1,9 +1,8 @@
CFILES = $(wildcard *.c lib/*.c) CFILES = $(wildcard *.c lib/*.c)
OFILES = $(CFILES:.c=.o) OFILES = $(CFILES:.c=.o)
GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib GCCFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin GCCPATH = ../../gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin
all: clean kernel8.img all: clean kernel8.img
boot/boot.o: boot/boot.S boot/boot.o: boot/boot.S

4
part11-breakout-smp/lib/io.c
View file

@ -19,8 +19,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }

4
part12-wgt/lib/io.c
View file

@ -19,8 +19,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }

4
part13-interrupts/lib/io.c
View file

@ -19,8 +19,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }

4
part14-spi-ethernet/lib/io.c
View file

@ -19,8 +19,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }

4
part4-miniuart/io.c
View file

@ -17,8 +17,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }

4
part5-framebuffer/io.c
View file

@ -18,8 +18,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }

4
part6-breakout/io.c
View file

@ -18,8 +18,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }

4
part7-bluetooth/io.c
View file

@ -18,8 +18,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }

4
part8-breakout-ble/io.c
View file

@ -18,8 +18,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }

4
part9-sound/io.c
View file

@ -19,8 +19,8 @@ enum {
enum { enum {
Pull_None = 0, Pull_None = 0,
Pull_Down = 1, // Are down and up the right way around? Pull_Down = 2,
Pull_Up = 2 Pull_Up = 1
}; };
void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; } void mmio_write(long reg, unsigned int val) { *(volatile unsigned int *)reg = val; }