add CatchAllDebugBucket as a syscall for debugging, add a basic network card plus ethernet driver (wip)

code/shell_native/shell_native.c

@@ -24,6 +24,32 @@ static void printInt(int32_t n) {
     else { printUInt((uint32_t)n); }
 }
 
+static uint64_t parseUInt64(const char* s) {
+    uint64_t v = 0;
+    while (*s == ' ') s++;
+    while (*s >= '0' && *s <= '9') v = v * 10 + (uint64_t)(*s++ - '0');
+    return v;
+}
+
+// Parse up to 6 comma-separated uint64 values.
+// Returns the number of values actually parsed.
+static int parseArgs(const char* line, uint64_t args[6]) {
+    int count = 0;
+    while (*line && count < 6) {
+        args[count++] = parseUInt64(line);
+        while (*line && *line != ',') line++;   // skip to next comma
+        if (*line == ',') line++;               // consume comma
+    }
+    return count;
+}
+
+static void printUInt64(uint64_t n) {
+    if (n == 0) { print("0"); return; }
+    char buf[20]; int i = 0;
+    while (n > 0) { buf[i++] = (char)('0' + (int)(n % 10)); n /= 10; }
+    while (i > 0) { char c[2] = { buf[--i], '\0' }; print(c); }
+}
+
 // ---------------------------------------------------------------------------
 // Line editor
 // ---------------------------------------------------------------------------
@@ -54,6 +80,7 @@ static char* trim(char* s) {
 static void cmd_help() {
     print("Available commands:\n"
           "  help              - Show this list\n"
+          "  debug             - Enter debug bucket mode\n"
           "  dir [path]        - List directory contents\n"
           "  cd <path>         - Change directory\n"
           "  type <file>       - Display file contents\n"
@@ -63,6 +90,32 @@ static void cmd_help() {
           "  exit              - Close the shell\n");
 }
 
+static void cmd_debug(void) {
+    print("Entered debug mode. Type args as: a0,a1,a2,a3,a4,a5\n");
+    print("Type 'exit' to leave.\n");
+
+    char line[MAX_CMD];
+    while (true) {
+        print("debug> ");
+        readLine(line, MAX_CMD);
+        char* t = trim(line);
+
+        if (strcmp(t, "exit") == 0) {
+            print("Exit debug.\n");
+            break;
+        }
+        if (*t == '\0') continue;
+
+        uint64_t args[6] = {0, 0, 0, 0, 0, 0};
+        parseArgs(t, args);
+
+        uint64_t ret = SysCatchAllDebugBucket(args[0], args[1], args[2],
+                                               args[3], args[4], args[5]);
+        printUInt64(ret);
+        print("\n");
+    }
+}
+
 static void cmd_write(const char* args) {
     char filename[MAX_CMD]; int i = 0;
     while (args[i] != ' ' && args[i] != '\0' && i < MAX_CMD - 1) {
@@ -150,6 +203,7 @@ static int runCommand(const char* cmd) {
     if (strcmp(cmd, "help") == 0) { cmd_help(); return 0; }
     if (strcmp(cmd, "clear") == 0) { SysScreenClear(0); return 0; }
     if (strcmp(cmd, "crash") == 0) { *(int*)0 = 42; return 0; }
+    if (strcmp(cmd, "debug") == 0) { cmd_debug(); return 0; }
     if (strcmp(cmd, "dir") == 0) { cmd_dir("."); return 0; }
     if (strncmp(cmd, "dir ", 4) == 0) { cmd_dir(cmd + 4); return 0; }
     if (strncmp(cmd, "cd ", 3) == 0) { if (SysSetCwd(cmd + 3) != 0) print("cd: failed\n"); return 0; }