[src/riastradh-drm2]: src/sys/external/bsd/drm2/include/linux First stab at v...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a3575c75603b
branches:  riastradh-drm2
changeset: 788066:a3575c75603b
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Wed Jul 24 02:04:31 2013 +0000

description:
First stab at vm_mmap in <linux/mm.h>.  Also PAGE_SIZE & round_page.

diffstat:

 sys/external/bsd/drm2/include/linux/mm.h |  77 +++++++++++++++++++++++++++++++-
 1 files changed, 76 insertions(+), 1 deletions(-)

diffs (89 lines):

diff -r 6d45739239e1 -r a3575c75603b sys/external/bsd/drm2/include/linux/mm.h
--- a/sys/external/bsd/drm2/include/linux/mm.h  Wed Jul 24 02:04:16 2013 +0000
+++ b/sys/external/bsd/drm2/include/linux/mm.h  Wed Jul 24 02:04:31 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mm.h,v 1.1.2.1 2013/07/24 00:33:12 riastradh Exp $     */
+/*     $NetBSD: mm.h,v 1.1.2.2 2013/07/24 02:04:31 riastradh Exp $     */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -32,4 +32,79 @@
 #ifndef _LINUX_MM_H_
 #define _LINUX_MM_H_
 
+#include <sys/kauth.h>
+#include <sys/file.h>
+#include <sys/mman.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+
+#include <uvm/uvm_extern.h>
+
+#define        PAGE_ALIGN(x)   round_page(x)
+
+/*
+ * ###################################################################
+ * ############### XXX THIS NEEDS SERIOUS SCRUTINY XXX ###############
+ * ###################################################################
+ */
+
+/*
+ * XXX unsigned long is a loser but will probably work accidentally.
+ * XXX struct file might not map quite right between Linux and NetBSD.
+ * XXX This is large enough it should take its own file.
+ */
+
+static inline unsigned long
+vm_mmap(struct file *file, unsigned long base, unsigned long size,
+    unsigned long prot, unsigned long flags, unsigned long token)
+{
+       struct vnode *vnode;
+       vaddr_t addr = 0;
+       int error;
+
+       /*
+        * Cargo-culted from sys_mmap.  Various conditions kasserted
+        * rather than checked for expedience and safey.
+        */
+
+       KASSERT(base == 0);
+       KASSERT(prot == (PROT_READ | PROT_WRITE));
+       KASSERT(flags == MAP_SHARED);
+
+       KASSERT(file->f_type == DTYPE_VNODE);
+       vnode = file->f_data;
+
+       KASSERT(vnode->v_type == VCHR);
+       KASSERT((file->f_flag & (FREAD | FWRITE)) == (FREAD | FWRITE));
+
+       {
+               struct vattr va;
+
+               vn_lock(vnode, (LK_SHARED | LK_RETRY));
+               error = VOP_GETATTR(vnode, &va, kauth_cred_get());
+               VOP_UNLOCK(vnode);
+               if (error)
+                       goto out;
+               /* XXX kassert?  */
+               if ((va.va_flags & (SF_SNAPSHOT | IMMUTABLE | APPEND)) != 0) {
+                       error = EACCES;
+                       goto out;
+               }
+       }
+
+       /* XXX pax_mprotect?  pax_aslr?  */
+
+       error = uvm_mmap(&curproc->p_vmspace->vm_map, &addr, size,
+           (VM_PROT_READ | VM_PROT_WRITE), (VM_PROT_READ | VM_PROT_WRITE),
+           MAP_SHARED, vnode, base,
+           curproc->p_rlimit[RLIMIT_MEMLOCK].rlim_cur);
+       if (error)
+               goto out;
+
+       KASSERT(addr <= -1024UL); /* XXX Kludgerosity!  */
+
+out:   /* XXX errno NetBSD->Linux (kludgerific) */
+       return (error? (-error) : (unsigned long)addr);
+}
+
 #endif  /* _LINUX_MM_H_ */