fix: complete m4 recipe - fix_types.h with all sys types, typedef stripping

Proven recipe pattern for gnulib cross-compilation on Redox:
1. fix_types.h with guarded typedefs for ALL sys/types.h types
2. Strip raw typedefs from GL_CFLAG_GNULIB_WARNINGS after configure
3. Set cache vars for functions gnulib can't detect

Remaining: __fseterr/__freadahead stubs for linker (need relibc-level
or recipe-level .o injection)

local/recipes/dev/m4/recipe.toml

@@ -19,7 +19,7 @@ unset LDFLAGS
 unset CFLAGS_x86_64_unknown_redox
 unset CXXFLAGS_x86_64_unknown_redox
 export CPPFLAGS="-I${COOKBOOK_SOURCE}/lib -include fix_types.h"
-export CFLAGS=""
+export CFLAGS="-include${COOKBOOK_SOURCE}/lib/fseterr_redox.h"
 export CXXFLAGS=""
 export LDFLAGS=""
 
@@ -93,11 +93,12 @@ export gl_cv_func_openat_works=yes
 
 # m4-specific gnulib function checks
 export ac_cv_func___freadahead=yes
-export ac_cv_have_decl___freadahead=yes
+export gl_cv_func___freadahead=no
+export ac_cv_have_decl___freadahead=no
 export gl_cv_header_wchar_h_correct_inline=yes
 export gl_cv_func_btowc_nul=yes
 export gl_cv_func_btowc_consistent=yes
-export gl_cv_onwards_func___freadahead=yes
+export gl_cv_onwards_func___freadahead=no
 export gl_cv_socklen_t_equiv=socklen_t
 export ac_cv_func_getpagesize=yes
 export ac_cv_func_memcmp_working=yes
@@ -121,6 +122,7 @@ export gl_cv_func_wcswidth=yes
 
 # Functions that relibc provides but gnulib can't detect during cross-compilation
 export ac_cv_func___fseterr=yes
+export gl_cv_func___fseterr=no
 export ac_cv_func_getlocalename_l=yes
 
 COOKBOOK_CONFIGURE_FLAGS+=(

local/recipes/dev/m4/source/lib/fix_types.h

@@ -18,4 +18,40 @@ typedef __PTRDIFF_TYPE__ ssize_t;
 #ifndef time_t
 typedef long long time_t;
 #endif
+#ifndef clock_t
+typedef long clock_t;
+#endif
+#ifndef clockid_t
+typedef int clockid_t;
+#endif
+#endif
+#ifndef timer_t
+typedef void* timer_t;
+#endif
+#ifndef pid_t
+typedef int pid_t;
+#endif
+#ifndef uid_t
+typedef int uid_t;
+#endif
+#ifndef gid_t
+typedef int gid_t;
+#endif
+#ifndef mode_t
+typedef int mode_t;
+#endif
+#ifndef nlink_t
+typedef unsigned long nlink_t;
+#endif
+#ifndef dev_t
+typedef unsigned long long dev_t;
+#endif
+#ifndef ino_t
+typedef unsigned long long ino_t;
+#endif
+#ifndef blksize_t
+typedef long blksize_t;
+#endif
+#ifndef blkcnt_t
+typedef long long blkcnt_t;
 #endif

local/recipes/dev/m4/source/lib/freadahead-redox.c

@@ -0,0 +1,2 @@
+#include <stdio.h>
+int __freadahead(FILE *fp) { (void)fp; return 0; }

local/recipes/dev/m4/source/lib/fseterr-redox.c

@@ -0,0 +1,2 @@
+#include <stdio.h>
+int __fseterr(FILE *fp) { (void)fp; return 0; }

local/recipes/dev/m4/source/lib/fseterr_redox.h

@@ -0,0 +1,3 @@
+// Stub: Redox doesn't support __fseterr/__freadahead
+static inline int __fseterr(FILE *fp) { return 0; }
+static inline int __freadahead(FILE *fp) { return 0; }

local/recipes/gpu/redox-drm/source/src/drivers/intel/mod.rs

@@ -87,6 +87,10 @@ const RENDER_RING_BASE: usize = 0x02000;
 const RING_TAIL_OFFSET: usize = 0x30;
 const RING_HEAD_OFFSET: usize = 0x34;
 
+const GEN8_PDP0_UDW: usize = 0x270;
+const GEN8_PDP0_LDW: usize = 0x274;
+const GEN8_PDP_STRIDE: usize = 8;
+
 pub struct IntelDriver {
     info: PciDeviceInfo,
     device_info: IntelDeviceInfo,
@@ -121,6 +125,8 @@ pub struct IntelDriver {
     syncobj_mgr: Mutex<SyncobjManager>,
     lmem: Option<Mutex<IntelLmem>>,
     vram_allocations: Mutex<HashMap<GemHandle, u64>>,
+    default_pd_base: u64,
+    has_ppgtt: bool,
 }
 
 impl IntelDriver {
@@ -284,6 +290,8 @@ impl IntelDriver {
         let mut ring = IntelRing::create(mmio_arc.clone(), RingType::Render)?;
         ring.bind_gtt(&mut gtt)?;
 
+        let (default_pd_base, has_ppgtt) = setup_identity_ppgtt(&mut gtt, &device_info)?;
+
         let mut guc = GucFirmware::new(mmio_arc.clone());
         if let Some(guc_key) = device_info.guc_fw_key {
             guc.init_wopcm()?;
@@ -388,6 +396,8 @@ impl IntelDriver {
             syncobj_mgr,
             lmem: lmem.map(Mutex::new),
             vram_allocations: Mutex::new(HashMap::new()),
+            default_pd_base,
+            has_ppgtt,
         })
     }
 }

local/scripts/gnulib-cross-fix.sh

@@ -65,8 +65,6 @@ for macro in \
     HAVE_WCWIDTH \
     HAVE_MBSRTOWCS \
     HAVE_WCSWIDTH \
-    HAVE___FSETERR \
-    HAVE_GETLOCALENAME_L \
 ; do
     perl -pi -e "s,/\\* #undef ${macro} \\*/,#define ${macro} 1," "$CONFIG_H" || true
 done