Network fix

src/kernel/idt.c

@@ -3,25 +3,14 @@
 // This header needs to maintain in any file it is present in, as per the GPL license terms.
 #include "idt.h"
 #include "io.h"
+#include "kutils.h"
 
 extern void serial_write(const char *str);
 
-// Simple hex printer for debugging
-static void print_hex(uint64_t val) {
-    const char* digits = "0123456789ABCDEF";
-    char buf[17];
-    buf[16] = '\0';
-    for (int i = 15; i >= 0; i--) {
-        buf[i] = digits[val & 0xF];
-        val >>= 4;
-    }
-    serial_write("0x");
-    serial_write(buf);
-}
-
 #include "process.h"
 #include "cmd.h"
 
+
 void kernel_panic(registers_t *regs, const char *error_name);
 
 static const char *exception_messages[] = {
@@ -61,10 +50,13 @@ static const char *exception_messages[] = {
 
 uint64_t exception_handler_c(registers_t *regs) {
     uint64_t vector = regs->int_no;
+    char buf[17];
     
     // Serial Mirror
     serial_write("\n*** EXCEPTION ***\nVector: ");
-    print_hex(vector);
+    k_itoa_hex(vector, buf);
+    serial_write("0x");
+    serial_write(buf);
     
     if ((regs->cs & 0x3) != 0) {
         serial_write("\nUSER MODE EXCEPTION - Terminating process.\n");

src/kernel/kutils.c

@@ -66,6 +66,26 @@ void k_itoa(int n, char *buf) {
     }
 }
 
+void k_itoa_hex(uint64_t n, char *buf) {
+    const char *digits = "0123456789ABCDEF";
+    if (n == 0) {
+        buf[0] = '0';
+        buf[1] = 0;
+        return;
+    }
+    int i = 0;
+    while (n > 0) {
+        buf[i++] = digits[n & 0xF];
+        n >>= 4;
+    }
+    buf[i] = 0;
+    for (int j = 0; j < i / 2; j++) {
+        char t = buf[j];
+        buf[j] = buf[i - 1 - j];
+        buf[i - 1 - j] = t;
+    }
+}
+
 void k_delay(int iterations) {
     for (volatile int i = 0; i < iterations; i++) {
         __asm__ __volatile__("nop");

src/kernel/kutils.h

@@ -15,6 +15,7 @@ int k_strcmp(const char *s1, const char *s2);
 void k_strcpy(char *dest, const char *src);
 int k_atoi(const char *str);
 void k_itoa(int n, char *buf);
+void k_itoa_hex(uint64_t n, char *buf);
 
 // Kernel timing utilities
 void k_delay(int iterations);

src/kernel/network.c

@@ -10,6 +10,7 @@
 #include "net_defs.h"
 
 static int network_initialized = 0;
+static int has_ip = 0;
 static mac_address_t our_mac;
 static ipv4_address_t ip_address = {{0,0,0,0}};
 static ipv4_address_t gateway_ip = {{0,0,0,0}};
@@ -68,7 +69,8 @@ int network_get_mac_address(mac_address_t* mac){
 }
 
 int network_get_ipv4_address(ipv4_address_t* ip){ if(!network_initialized) return -1; *ip=ip_address; return 0; }
-int network_set_ipv4_address(const ipv4_address_t* ip){ if(!network_initialized) return -1; ip_address=*ip; return 0; }
+int network_set_ipv4_address(const ipv4_address_t* ip){ if(!network_initialized) return -1; ip_address=*ip; has_ip = 1; return 0; }
+int network_has_ip(void) { return has_ip; }
 
 int network_get_gateway_ip(ipv4_address_t* ip){ if(!network_initialized) return -1; *ip=gateway_ip; return 0; }
 int network_get_dns_ip(ipv4_address_t* ip){ if(!network_initialized) return -1; *ip=dns_server_ip; return 0; }
@@ -485,6 +487,7 @@ static void dhcp_udp_callback(const ipv4_address_t* src_ip,uint16_t src_port,con
             p+=l; 
         }
         
+        has_ip = 1;
         dhcp_state=2;
     } else if(mtype==DHCP_MSG_NAK){
         dhcp_state=-1;

src/kernel/network.h

@@ -77,6 +77,7 @@ int udp_send_packet_to_mac(const ipv4_address_t* dest_ip, const mac_address_t* d
 typedef void (*udp_callback_t)(const ipv4_address_t* src_ip, uint16_t src_port, const mac_address_t* src_mac, const void* data, size_t length);
 int udp_register_callback(uint16_t port, udp_callback_t callback);
 int network_is_initialized(void);
+int network_has_ip(void);
 int network_get_frames_received(void);
 int network_get_udp_packets_received(void);
 int network_get_udp_callbacks_called(void);

src/kernel/panic.c

@@ -4,6 +4,7 @@
 #include "process.h"
 #include "graphics.h"
 #include "io.h"
+#include "kutils.h"
 
 extern void serial_write(const char *str);
 
@@ -108,10 +109,35 @@ void kernel_panic(registers_t *regs, const char *error_name) {
     graphics_mark_screen_dirty();
     graphics_flip_buffer();
 
+    char hex_buf[17];
     serial_write("\n*** KERNEL PANIC ***\n");
     serial_write(error_name);
     serial_write("\n");
 
+    serial_write("Vector: 0x");
+    k_itoa_hex(regs->int_no, hex_buf);
+    serial_write(hex_buf);
+    serial_write("\n");
+
+    serial_write("Error Code: 0x");
+    k_itoa_hex(regs->err_code, hex_buf);
+    serial_write(hex_buf);
+    serial_write("\n");
+
+    serial_write("RIP: 0x");
+    k_itoa_hex(regs->rip, hex_buf);
+    serial_write(hex_buf);
+    serial_write("\n");
+
+    if (regs->int_no == 14) {
+        uint64_t cr2;
+        asm volatile("mov %%cr2, %0" : "=r"(cr2));
+        serial_write("CR2: 0x");
+        k_itoa_hex(cr2, hex_buf);
+        serial_write(hex_buf);
+        serial_write("\n");
+    }
+
     // Halt
     while(1) {
         asm volatile("cli; hlt");

src/kernel/syscall.c

@@ -723,6 +723,8 @@ uint64_t syscall_handler_c(uint64_t syscall_num, uint64_t arg1, uint64_t arg2, u
             return cli_cmd_ping_syscall(dest_ip);
         } else if (cmd == 27) { // SYSTEM_CMD_NETWORK_IS_INIT
             return network_is_initialized() ? 1 : 0;
+        } else if (cmd == 30) { // SYSTEM_CMD_NETWORK_HAS_IP
+            return network_has_ip() ? 1 : 0;
         } else if (cmd == 28) { // SYSTEM_CMD_GET_SHELL_CONFIG
             const char *key = (const char *)arg2;
             if (!key) return -1;

src/kernel/userland/about.c

@@ -41,7 +41,6 @@ static void about_paint(ui_window_t win) {
     int w = 185;
     int h = 240;
     
-    //ui_draw_rect(win, 0, 0, w, h, 0xFF1E1E1E);
     
     int offset_x = 15;
     int offset_y = 35;

src/kernel/userland/libc/syscall.c

@@ -179,6 +179,10 @@ int sys_network_is_initialized(void) {
     return (int)syscall2(SYS_SYSTEM, SYSTEM_CMD_NETWORK_IS_INIT, 0);
 }
 
+int sys_network_has_ip(void) {
+    return (int)syscall2(SYS_SYSTEM, SYSTEM_CMD_NETWORK_HAS_IP, 0);
+}
+
 uint64_t sys_get_shell_config(const char *key) {
     return (uint64_t)sys_system(SYSTEM_CMD_GET_SHELL_CONFIG, (uint64_t)key, 0, 0, 0);
 }

src/kernel/userland/libc/syscall.h

@@ -56,6 +56,7 @@
 #define SYSTEM_CMD_NETWORK_GET_DNS 25
 #define SYSTEM_CMD_ICMP_PING 26
 #define SYSTEM_CMD_NETWORK_IS_INIT 27
+#define SYSTEM_CMD_NETWORK_HAS_IP 30
 #define SYSTEM_CMD_GET_SHELL_CONFIG 28
 #define SYSTEM_CMD_SET_TEXT_COLOR 29
 
@@ -114,8 +115,9 @@ int sys_network_get_dns(net_ipv4_address_t *ip);
 int sys_udp_send(const net_ipv4_address_t *dest_ip, uint16_t dest_port, uint16_t src_port, const void *data, size_t data_len);
 int sys_icmp_ping(const net_ipv4_address_t *dest_ip);
 int sys_network_is_initialized(void);
-
+int sys_network_has_ip(void);
 uint64_t sys_get_shell_config(const char *key);
 void sys_set_text_color(uint32_t color);
 
+
 #endif

src/kernel/userland/net.c

@@ -74,13 +74,17 @@ static void cmd_netinfo(void) {
         printf("\n");
     }
     
-    if (sys_network_get_ip(&ip) == 0) {
-        printf("IP: ");
-        for (int i = 0; i < 4; i++) {
-            printf("%d", ip.bytes[i]);
-            if (i < 3) printf(".");
+    if (sys_network_has_ip()) {
+        if (sys_network_get_ip(&ip) == 0) {
+            printf("IP: ");
+            for (int i = 0; i < 4; i++) {
+                printf("%d", ip.bytes[i]);
+                if (i < 3) printf(".");
+            }
+            printf("\n");
         }
-        printf("\n");
+    } else {
+        printf("IP: Not assigned\n");
     }
     
     printf("Frames: %d\n", sys_network_get_stat(0));