From cd905cd58a2521fd57409ba26a5e7acc8005e21f Mon Sep 17 00:00:00 2001
From: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Wed, 4 May 2011 11:46:05 +0800
Subject: [PATCH] i386: Copy pmap_mapdev_uncacheable() from x86_64

---
 sys/platform/pc32/i386/pmap.c    | 29 +++++++++++++++++++++++++++++
 sys/platform/pc32/include/pmap.h |  1 +
 2 files changed, 30 insertions(+)

diff --git a/sys/platform/pc32/i386/pmap.c b/sys/platform/pc32/i386/pmap.c
index 25816c5395..a3f52389d9 100644
--- a/sys/platform/pc32/i386/pmap.c
+++ b/sys/platform/pc32/i386/pmap.c
@@ -3313,6 +3313,35 @@ pmap_mapdev(vm_paddr_t pa, vm_size_t size)
 	return ((void *)(va + offset));
 }
 
+void *
+pmap_mapdev_uncacheable(vm_paddr_t pa, vm_size_t size)
+{
+	vm_offset_t va, tmpva, offset;
+	unsigned *pte;
+
+	offset = pa & PAGE_MASK;
+	size = roundup(offset + size, PAGE_SIZE);
+
+	va = kmem_alloc_nofault(&kernel_map, size, PAGE_SIZE);
+	if (va == 0) {
+		panic("pmap_mapdev_uncacheable: "
+		    "Couldn't alloc kernel virtual memory");
+	}
+
+	pa = pa & PG_FRAME;
+	for (tmpva = va; size > 0;) {
+		pte = (unsigned *)vtopte(tmpva);
+		*pte = pa | PG_RW | PG_V | PG_N; /* | pgeflag; */
+		size -= PAGE_SIZE;
+		tmpva += PAGE_SIZE;
+		pa += PAGE_SIZE;
+	}
+	cpu_invltlb();
+	smp_invltlb();
+
+	return ((void *)(va + offset));
+}
+
 /*
  * No requirements.
  */
diff --git a/sys/platform/pc32/include/pmap.h b/sys/platform/pc32/include/pmap.h
index 37d0355c26..dbbe40a31f 100644
--- a/sys/platform/pc32/include/pmap.h
+++ b/sys/platform/pc32/include/pmap.h
@@ -286,6 +286,7 @@ extern char *ptvmmap;		/* poor name! */
 void	pmap_interlock_wait (struct vmspace *);
 void	pmap_bootstrap (vm_paddr_t, vm_paddr_t);
 void	*pmap_mapdev (vm_paddr_t, vm_size_t);
+void	*pmap_mapdev_uncacheable (vm_paddr_t, vm_size_t);
 void	pmap_unmapdev (vm_offset_t, vm_size_t);
 unsigned *pmap_kernel_pte (vm_offset_t) __pure2;
 struct vm_page *pmap_use_pt (pmap_t, vm_offset_t);
-- 
2.41.0