Differences

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--- kernel_space [2007-07-12 18:32] – nik
+++ kernel_space [2012-06-26 10:33] – nik
@@ Line 2: / Line 2: @@
-using scheme
+using [[scheme language|scheme]]
 actually, a way of accessing hardware from a userspace repl.
@@ Line 10: / Line 10: @@
 From: Rob Warnock (rpw3 (at) rpw3 (dot) org)
-<file>
+<html><pre>
 +---------------
 | Harri Haataja wrote:
@@ Line 90: / Line 89: @@
 -Rob
+</pre></html>
---
 Just go for it! It's really easy to get started:
-. Run some O/S on your machine that allows you to "mmap()" PCI bus space
+  - Run some O/S on your machine that allows you to "mmap()" PCI bus space into user mode (possibly requiring superuser privilege, but hey, it's *your* machine, right?).  Note: Some OSs don't provide "mmap()" access though device special files per se, but *do* let you use some other access path, such as /dev/mem, /dev/kmem, or /dev/mmem, etc., to map at least the memory space of I/O busses into use process space.
-   into user mode (possibly requiring superuser privilege, but hey, it's
-   *your* machine, right?).  Note: Some OSs don't provide "mmap()" access
-   though device special files per se, but *do* let you use some other
-   access path, such as /dev/mem, /dev/kmem, or /dev/mmem, etc., to map
-   at least the memory space of I/O busses into use process space.
-. Run some Scheme on your machine that allows you to dynamically link in
+  - Run some Scheme on your machine that allows you to dynamically link in libraries at runtime (almost any of the popular ones, at least if the answer to #1 was some flavor of Unix or Linux), or use one of the ones that compile to C and let you link in stuff statically.
-   libraries at runtime (almost any of the popular ones, at least if the
-   answer to #1 was some flavor of Unix or Linux), or use one of the ones
-   that compile to C and let you link in stuff statically.
-. Find *some* card or chip whose memory register layout you know.
+  - Find *some* card or chip whose memory register layout you know. (Older ones are sometimes easier to find documentation for.)
-   (Older ones are sometimes easier to find documentation for.)
-. Hack up a peek/poke/mmap/etc. library for your Scheme, map in that
+  - Hack up a peek/poke/mmap/etc. library for your Scheme, map in that card (or chip), and start poking around to see what you can see.
-   card (or chip), and start poking around to see what you can see.
 WARNING! It is *very* likely that you will crash the host several times
 while getting this all to work. DO NOT USE A CRITICAL OR SHARED COMPUTER!
-</file>