From: Philip Homburg <philip@cs.vu.nl>
Date: Fri, 22 Feb 2008 10:51:37 +0000 (+0000)
Subject: Added do_mapdma.
X-Git-Tag: v3.1.4~280
X-Git-Url: http://zhaoyanbai.com/repos/zlib_tech.html?a=commitdiff_plain;h=2679321ba05b9419c0d9e8be590c1b7b4dea49a2;p=minix.git

Added do_mapdma.
---

diff --git a/kernel/system/Makefile b/kernel/system/Makefile
index fa1462e30..c6a4a0f66 100644
--- a/kernel/system/Makefile
+++ b/kernel/system/Makefile
@@ -54,7 +54,8 @@ OBJECTS	= \
 	$(SYSTEM)(do_vm_setbuf.o) \
 	$(SYSTEM)(do_sprofile.o) \
 	$(SYSTEM)(do_cprofile.o) \
-	$(SYSTEM)(do_profbuf.o)
+	$(SYSTEM)(do_profbuf.o) \
+	$(SYSTEM)(do_mapdma.o) 
 
 build $(SYSTEM):	$(OBJECTS)
 	aal cr $@ *.o
@@ -168,3 +169,6 @@ $(SYSTEM)(do_cprofile.o):       do_cprofile.c
 
 $(SYSTEM)(do_profbuf.o):        do_profbuf.c
 	$(CC) do_profbuf.c
+
+$(SYSTEM)(do_mapdma.o):        do_mapdma.c
+	$(CC) do_mapdma.c
diff --git a/kernel/system/do_mapdma.c b/kernel/system/do_mapdma.c
new file mode 100644
index 000000000..47f0c43ca
--- /dev/null
+++ b/kernel/system/do_mapdma.c
@@ -0,0 +1,44 @@
+/* The kernel call implemented in this file:
+ *   m_type:	SYS_MAPDMA
+ *
+ * The parameters for this kernel call are:
+ *    m5_l1:	CP_SRC_ADDR	(virtual address)	
+ *    m5_l3:	CP_NR_BYTES	(size of datastructure) 	
+ */
+
+#include "../system.h"
+
+/*==========================================================================*
+ *				do_mapdma				    *
+ *==========================================================================*/
+PUBLIC int do_mapdma(m_ptr)
+register message *m_ptr;	/* pointer to request message */
+{
+	int r;
+	endpoint_t proc_e;
+	int proc_p;
+	vir_bytes base, size;
+	phys_bytes phys_base;
+	struct proc *proc;
+	message m;
+
+	proc_e = m_ptr->CP_SRC_ENDPT;
+	base= m_ptr->CP_SRC_ADDR;
+	size= m_ptr->CP_NR_BYTES;
+
+	if (!isokendpt(proc_e, &proc_p))
+		return(EINVAL);
+
+	proc = proc_addr(proc_p);
+
+	phys_base= umap_local(proc, D, base, size);
+	if (!phys_base)
+	{
+		kprintf("do_mapdma: umap_local failed\n");
+		return EFAULT;
+	}
+
+	m_ptr->CP_DST_ADDR = phys_base;
+	return OK;
+}
+