usertests and optional finished

user/dirtypagestest.c

@@ -0,0 +1,62 @@
+#include "kernel/types.h"
+#include "kernel/stat.h"
+#include "user/user.h"
+
+void
+test_dirtypages()
+{
+    printf("dirtypages test starting\n");
+    
+    // Allocate some pages
+    char *buf = malloc(32 * 4096);  // 32 pages
+    if(buf == 0) {
+        printf("malloc failed\n");
+        exit(1);
+    }
+    
+    // Clear dirty bits first by calling dirtypages
+    unsigned int dbits;
+    if (dirtypages(buf, 32, &dbits) < 0) {
+        printf("dirtypages failed\n");
+        exit(1);
+    }
+    printf("Initial dirty bits cleared: 0x%x\n", dbits);
+    
+    // Write to some pages to make them dirty
+    buf[0] = 1;         // Page 0
+    buf[4096 * 5] = 1;  // Page 5
+    buf[4096 * 10] = 1; // Page 10
+    
+    // Check dirty pages
+    if (dirtypages(buf, 32, &dbits) < 0) {
+        printf("dirtypages failed\n");
+        exit(1);
+    }
+    
+    printf("Dirty bits after writes: 0x%x\n", dbits);
+    
+    // Check if the expected pages are marked as dirty
+    if (dbits & (1 << 0))
+        printf("Page 0 is dirty (expected)\n");
+    if (dbits & (1 << 5))
+        printf("Page 5 is dirty (expected)\n");
+    if (dbits & (1 << 10))
+        printf("Page 10 is dirty (expected)\n");
+    
+    // Check again - dirty bits should be cleared now
+    if (dirtypages(buf, 32, &dbits) < 0) {
+        printf("dirtypages failed\n");
+        exit(1);
+    }
+    printf("Dirty bits after clearing: 0x%x (should be 0)\n", dbits);
+    
+    free(buf);
+    printf("dirtypages test: OK\n");
+}
+
+int
+main(int argc, char *argv[])
+{
+    test_dirtypages();
+    exit(0);
+}