Changeset 965dc18 in mainline for boot/arch/sparc64/loader/main.c

Timestamp:

2008-12-05T19:59:03Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

49093a4

Parents:

0258e67

Message:

Merge sparc branch to trunk.

File:

• boot/arch/sparc64/loader/main.c (modified) (5 diffs)

boot/arch/sparc64/loader/main.c

@@ -40 +40 @@
 
 bootinfo_t bootinfo;
+
 component_t components[COMPONENTS];
 
@@ -55 +56 @@
         char *timestamp = "";
 #endif
+
+/** UltraSPARC subarchitecture - 1 for US, 3 for US3 */
+uint8_t subarchitecture;
+
+/**
+ * mask of the MID field inside the ICBUS_CONFIG register shifted by
+ * MID_SHIFT bits to the right
+ */
+uint16_t mid_mask;
 
 /** Print version information. */
@@ -64 +74 @@
 }
 
+/* the lowest ID (read from the VER register) of some US3 CPU model */
+#define FIRST_US3_CPU   0x14
+
+/* the greatest ID (read from the VER register) of some US3 CPU model */
+#define LAST_US3_CPU    0x19
+
+/* UltraSPARC IIIi processor implementation code */
+#define US_IIIi_CODE    0x15
+
+/**
+ * Sets the global variables "subarchitecture" and "mid_mask" to
+ * correct values.
+ */
+static void detect_subarchitecture(void)
+{
+        uint64_t v;
+        asm volatile ("rdpr %%ver, %0\n" : "=r" (v));
+        
+        v = (v << 16) >> 48;
+        if ((v >= FIRST_US3_CPU) && (v <= LAST_US3_CPU)) {
+                subarchitecture = SUBARCH_US3;
+                if (v == US_IIIi_CODE)
+                        mid_mask = (1 << 5) - 1;
+                else
+                        mid_mask = (1 << 10) - 1;
+        } else if (v < FIRST_US3_CPU) {
+                subarchitecture = SUBARCH_US;
+                mid_mask = (1 << 5) - 1;
+        } else {
+                printf("\nThis CPU is not supported by HelenOS.");
+        }
+}
+
 void bootstrap(void)
 {
@@ -73 +116 @@
         version_print();
         
+        detect_subarchitecture();
         init_components(components);
 
@@ -84 +128 @@
                 halt();
         }
-        
+
         if (bootinfo.memmap.total == 0) {
                 printf("Error: no memory detected, halting.\n");