Changeset c2020f7 in mainline

Timestamp:

2011-01-21T16:54:47Z (14 years ago)

Author:

Matus Dekanek <smekideki@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

81c0854f, a088d15

Parents:

c431a83

Message:

mman functions

Location:

uspace/lib/usb

Files:

• Makefile (modified) (1 diff)
• include/usb/usbmem.h (modified) (1 diff)
• src/usbmem.c (modified) (3 diffs)

uspace/lib/usb/Makefile

@@ -47 +47 @@
         src/usb.c \
         src/usbdrvreq.c \
-        src/usbdrv.c
+        src/usbdrv.c \
+        src/usbmem.c
 
 include $(USPACE_PREFIX)/Makefile.common

uspace/lib/usb/include/usb/usbmem.h

@@ -58 +58 @@
 #include <sys/types.h>
 
-extern void * mman_malloc(size_t size);
+extern void * mman_malloc(
+                size_t size,
+                size_t alignment,
+                unsigned long max_physical_address);
 
 extern void * mman_getVA(void * addr);

uspace/lib/usb/src/usbmem.c

@@ -33 +33 @@
  */
 
-#include "usb/usbmem.h"
 #include <adt/hash_table.h>
 #include <adt/list.h>
+#include <as.h>
+#include <errno.h>
+#include <malloc.h>
+
+#include "usb/usbmem.h"
 
 #define ADDR_BUCKETS 1537
 
-hash_table_t * pa2fa_table = NULL;
-hash_table_t * fa2pa_table = NULL;
-
+//address translation tables
+static hash_table_t * pa2va_table = NULL;
+static hash_table_t * va2pa_table = NULL;
+
+/**
+ * address translation hashtable item
+ */
 typedef struct{
-        long addr;
+        unsigned long addr;
+        unsigned long translation;
         link_t link;
 
@@ -62 +71 @@
 static void addr_remove_callback(link_t *item)
 {
+        //delete item
+        addr_node_t *addr_node = hash_table_get_instance(item, addr_node_t, link);
+        free(addr_node);
 }
 
@@ -71 +83 @@
 };
 
-
-//
-
-
-void * mman_malloc(size_t size){
+/**
+ * create node for address translation hashtable
+ * @param addr
+ * @param translation
+ * @return
+ */
+static addr_node_t * create_addr_node(void * addr, void * translation){
+        addr_node_t * node = (addr_node_t*)malloc(sizeof(addr_node_t));
+        node->addr = (unsigned long)addr;
+        node->translation = (unsigned long)translation;
+        return node;
+}
+
+/**
+ * allocate size on heap and register it`s pa<->va translation
+ *
+ * If physical address + size is 2GB or higher, nothing is allocated and NULL
+ * is returned.
+ * @param size
+ * @param alignment
+ * @return
+ */
+void * mman_malloc(
+        size_t size,
+        size_t alignment,
+        unsigned long max_physical_address)
+{
+        if (size == 0)
+                return NULL;
+        if (alignment == 0)
+                return NULL;
         //check if tables were initialized
-        if(!pa2fa_table){
-                pa2fa_table = (hash_table_t*)malloc(sizeof(hash_table_t*));
-                fa2pa_table = (hash_table_t*)malloc(sizeof(hash_table_t*));
-                hash_table_create(pa2fa_table, ADDR_BUCKETS, 1,
+        if(!pa2va_table){
+                pa2va_table = (hash_table_t*)malloc(sizeof(hash_table_t*));
+                va2pa_table = (hash_table_t*)malloc(sizeof(hash_table_t*));
+                hash_table_create(pa2va_table, ADDR_BUCKETS, 1,
                     &addr_devices_ops);
-                hash_table_create(fa2pa_table, ADDR_BUCKETS, 1,
+                hash_table_create(va2pa_table, ADDR_BUCKETS, 1,
                     &addr_devices_ops);
         }
         //allocate
-
+        void * vaddr = memalign(alignment, size);
+        
         //get translation
-
+        void * paddr = NULL;
+        int opResult = as_get_physical_mapping(vaddr,(uintptr_t*)&paddr);
+        if(opResult != EOK){
+                //something went wrong
+                free(vaddr);
+                return NULL;
+        }
+        if((unsigned long)paddr + size > max_physical_address){
+                //unusable address for usb
+                free(vaddr);
+                return NULL;
+        }
         //store translation
-
-
-        return NULL;
-
-}
-
+        addr_node_t * pa2vaNode = create_addr_node(paddr,vaddr);
+        addr_node_t * va2paNode = create_addr_node(vaddr,paddr);
+
+        unsigned long keypaddr = (unsigned long)paddr;
+        unsigned long keyvaddr = (unsigned long)vaddr;
+        hash_table_insert(pa2va_table, (&keypaddr), &pa2vaNode->link);
+        hash_table_insert(va2pa_table, (&keyvaddr), &va2paNode->link);
+        //return
+        return vaddr;
+
+}
+
+/**
+ * get virtual address from physical
+ * @param addr
+ * @return translated virtual address or null
+ */
 void * mman_getVA(void * addr){
-        return NULL;
-}
-
+        unsigned long keypaddr = (unsigned long)addr;
+        link_t * link = hash_table_find(pa2va_table, &keypaddr);
+        if(!link) return NULL;
+        addr_node_t * node = hash_table_get_instance(link, addr_node_t, link);
+        return (void*)node->translation;
+}
+
+/**
+ * get physical address from virtual
+ * @param addr
+ * @return physical address or null
+ */
 void * mman_getPA(void * addr){
-        return NULL;
-}
-
-void mman_free(void * addr){
-        
+        unsigned long keyvaddr = (unsigned long)addr;
+        link_t * link = hash_table_find(va2pa_table, &keyvaddr);
+        if(!link) return NULL;
+        addr_node_t * node = hash_table_get_instance(link, addr_node_t, link);
+        return (void*)node->translation;
+}
+
+/**
+ * free the address and deregister it from pa<->va translation
+ * @param vaddr if NULL, nothing happens
+ */
+void mman_free(void * vaddr){
+        if(!vaddr)
+                return;
+        //get paddress
+        void * paddr = mman_getPA(vaddr);
+        unsigned long keypaddr = (unsigned long)paddr;
+        unsigned long keyvaddr = (unsigned long)vaddr;
+        //remove mapping
+        hash_table_remove(pa2va_table,&keypaddr, 1);
+        hash_table_remove(va2pa_table,&keyvaddr, 1);
+        //free address
+        free(vaddr);
 }