Red Bear OS — microkernel OS in Rust, based on Redox

Derivative of Redox OS (https://www.redox-os.org) adding:
- AMD GPU driver (amdgpu) via LinuxKPI compat layer
- ext4 filesystem support (ext4d scheme daemon)
- ACPI fixes for AMD bare metal (x2APIC, DMAR, IVRS, MCFG)
- Custom branding (hostname, os-release, boot identity)

Build system is full upstream Redox with RBOS overlay in local/.
Patches for kernel, base, and relibc are symlinked from local/patches/
and protected from make clean/distclean. Custom recipes live in
local/recipes/ with symlinks into the recipes/ search path.

Build:  make all CONFIG_NAME=redbear-full
Sync:   ./local/scripts/sync-upstream.sh

recipes/dev/patch/01_no_rlimit.patch

@@ -0,0 +1,35 @@
+diff -ru source/lib/getdtablesize.c source-new/lib/getdtablesize.c
+--- source/lib/getdtablesize.c	2015-03-06 16:31:45.000000000 -0800
++++ source-new/lib/getdtablesize.c	2017-08-08 19:33:33.993874985 -0700
+@@ -106,15 +106,6 @@
+ int
+ getdtablesize (void)
+ {
+-  struct rlimit lim;
+-
+-  if (getrlimit (RLIMIT_NOFILE, &lim) == 0
+-      && 0 <= lim.rlim_cur && lim.rlim_cur <= INT_MAX
+-      && lim.rlim_cur != RLIM_INFINITY
+-      && lim.rlim_cur != RLIM_SAVED_CUR
+-      && lim.rlim_cur != RLIM_SAVED_MAX)
+-    return lim.rlim_cur;
+-
+   return INT_MAX;
+ }
+ 
+Only in source-new/lib: getdtablesize.c.orig
+diff -ru source/src/safe.c source-new/src/safe.c
+--- source/src/safe.c	2015-03-06 16:34:20.000000000 -0800
++++ source-new/src/safe.c	2017-08-08 19:33:53.447430811 -0700
+@@ -92,11 +92,7 @@
+ 
+ static void init_dirfd_cache (void)
+ {
+-  struct rlimit nofile;
+-
+   max_cached_fds = 8;
+-  if (getrlimit (RLIMIT_NOFILE, &nofile) == 0)
+-    max_cached_fds = MAX (nofile.rlim_cur / 4, max_cached_fds);
+ 
+   cached_dirfds = hash_initialize (max_cached_fds,
+ 				   NULL,