1 files changed, 107 insertions, 0 deletions
diff --git a/arch/sparc/kernel/promops.c b/arch/sparc/kernel/promops.c
new file mode 100644
index 000000000..b5c897b0d
--- /dev/null
+++ b/arch/sparc/kernel/promops.c
@@ -0,0 +1,107 @@
+/* promops.c:  Prom node tree operations and Prom Vector initialization
+ *             initialization routines.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/kernel.h>
+
+#include <asm/openprom.h>
+
+/* #define DEBUG_PROMOPS */
+#define MAX_PR_LEN   64           /* exotic hardware probably overshoots this */
+
+int prom_node_root;               /* initialized in init_prom */
+
+extern struct linux_romvec *romvec;
+
+/* These two functions return and siblings and direct child descendents
+ * in the prom device tree respectively.
+ */
+
+int
+node_get_sibling(int node)
+{
+  return (*(romvec->pv_nodeops->no_nextnode))(node);
+}
+
+int
+node_get_child(int node)
+{
+  return (*(romvec->pv_nodeops->no_child))(node);
+}
+
+/* The following routine is used during device probing to determine
+ * an integer value property about a (perhaps virtual) device. This
+ * could be anything, like the size of the mmu cache lines, etc.
+ * the default return value is -1 is the prom has nothing interesting.
+ */
+
+unsigned int prom_int_null;
+
+unsigned int *
+get_int_from_prom(int node, char *nd_prop, unsigned int *value)
+{
+  unsigned int pr_len;
+
+  *value = &prom_int_null;    /* duh, I was returning -1 as an unsigned int, prom_panic() */
+
+  pr_len = romvec->pv_nodeops->no_proplen(node, nd_prop);
+  if(pr_len > MAX_PR_LEN)
+    {
+#ifdef DEBUG_PROMOPS
+      printk("Bad pr_len in promops -- node: %d nd_prop: %s pr_len: %d",
+	     node, nd_prop, (int) pr_len);
+#endif
+      return value;      /* XXX */
+    }
+
+  romvec->pv_nodeops->no_getprop(node, nd_prop, (char *) value);
+
+  return value;
+}
+
+
+/* This routine returns what is termed a property string as opposed
+ * to a property integer as above. This can be used to extract the
+ * 'type' of device from the prom. An example could be the clock timer
+ * chip type. By default you get returned a null string if garbage
+ * is returned from the prom.
+ */
+
+char *
+get_str_from_prom(int node, char *nd_prop, char *value)
+{
+  unsigned int pr_len;
+
+  *value='\n';
+
+  pr_len = romvec->pv_nodeops->no_proplen(node, nd_prop);
+  if(pr_len > MAX_PR_LEN)
+    {
+#ifdef DEBUG_PROMOPS
+      printk("Bad pr_len in promops -- node: %d nd_prop: %s pr_len: %d",
+	     node, nd_prop, pr_len);
+#endif
+      return value;      /* XXX */
+    }
+
+  romvec->pv_nodeops->no_getprop(node, nd_prop, value);
+  value[pr_len] = 0;
+
+  return value;
+}
+
+/* This gets called from head.S upon bootup to initialize the
+ * prom vector pointer for the rest of the kernel.
+ */
+
+void
+init_prom(struct linux_romvec *r_ptr)
+{
+  romvec = r_ptr;
+  prom_node_root = romvec->pv_nodeops->no_nextnode(0);
+  prom_int_null = 0;
+  
+  return;
+}