add lwIP TCP/IP stack as a runtime driver, native socket syscalls, SysGetMemoryStatus replacing CatchAllDebugBucket, fix timeGetTime to return milliseconds, fix SysSleep to interpret argument as milliseconds, SysGetTick now returns microseconds, harden all syscalls against bad user pointers with CopyFromUser/CopyToUser/MmProbeUser throughout, add networking test apps, port-forward 8080 in runa.bat, split LWIP_DRIVER_CFLAGS, add settings.ini to deploy, remove ethernet.c stub

code/drivers/lwip/include/lwipopts.h

@@ -0,0 +1,91 @@
+#pragma once
+/*
+ * lwipopts.h - kernel port configuration for lwIP 2.2.1.
+ *
+ * This is intentionally a practical first configuration: IPv4, ARP, ICMP,
+ * UDP, TCP, DHCP, DNS and netconn are enabled; IPv6, PPP,
+ * SNMP, lwIP's POSIX socket API, and app protocols stay off.
+ */
+
+#define NO_SYS                          0
+#define SYS_LIGHTWEIGHT_PROT            1
+#define MEM_ALIGNMENT                   8
+
+/* Keep lwIP memory self-contained. It uses its own heap/pools, not malloc(). */
+#define MEM_LIBC_MALLOC                 0
+#define MEMP_MEM_MALLOC                 0
+#define MEM_SIZE                        (256 * 1024)
+#define MEMP_OVERFLOW_CHECK             0
+#define MEMP_SANITY_CHECK               0
+
+#define PBUF_POOL_SIZE                  64
+#define PBUF_POOL_BUFSIZE               1536
+#define MEMP_NUM_PBUF                   32
+#define MEMP_NUM_NETBUF                 32
+#define MEMP_NUM_NETCONN                32
+#define MEMP_NUM_TCPIP_MSG_API          64
+#define MEMP_NUM_TCPIP_MSG_INPKT        64
+#define MEMP_NUM_SYS_TIMEOUT            32
+
+#define LWIP_IPV4                       1
+#define LWIP_IPV6                       0
+#define LWIP_ARP                        1
+#define LWIP_ETHERNET                   1
+#define LWIP_ICMP                       1
+#define LWIP_IGMP                       0
+#define LWIP_RAW                        1
+#define LWIP_UDP                        1
+#define LWIP_TCP                        1
+#define LWIP_DHCP                       1
+#define LWIP_AUTOIP                     0
+#define LWIP_DNS                        1
+
+#define TCP_MSS                         1460
+#define TCP_WND                         (4 * TCP_MSS)
+#define TCP_SND_BUF                     (4 * TCP_MSS)
+#define TCP_SND_QUEUELEN                16
+#define MEMP_NUM_TCP_PCB                16
+#define MEMP_NUM_TCP_PCB_LISTEN         8
+#define MEMP_NUM_TCP_SEG                32
+#define MEMP_NUM_UDP_PCB                16
+
+#define LWIP_NETCONN                    1
+#define LWIP_SOCKET                     0
+#define LWIP_COMPAT_SOCKETS             0
+#define LWIP_POSIX_SOCKETS_IO_NAMES     0
+#define LWIP_SOCKET_SELECT              0
+#define LWIP_SO_RCVTIMEO                1
+#define LWIP_SO_SNDTIMEO                1
+#define LWIP_SO_RCVBUF                  1
+#define LWIP_SO_REUSE                   1
+#define LWIP_TCP_KEEPALIVE              1
+
+#define TCPIP_THREAD_NAME               "tcpip"
+#define TCPIP_THREAD_STACKSIZE          0
+#define TCPIP_THREAD_PRIO               2
+#define TCPIP_MBOX_SIZE                 128
+#define DEFAULT_THREAD_STACKSIZE        0
+#define DEFAULT_THREAD_PRIO             1
+#define DEFAULT_RAW_RECVMBOX_SIZE       32
+#define DEFAULT_UDP_RECVMBOX_SIZE       64
+#define DEFAULT_TCP_RECVMBOX_SIZE       64
+#define DEFAULT_ACCEPTMBOX_SIZE         32
+
+#define LWIP_NETIF_HOSTNAME             1
+#define LWIP_NETIF_STATUS_CALLBACK      1
+#define LWIP_NETIF_LINK_CALLBACK        1
+#define LWIP_CHECKSUM_CTRL_PER_NETIF    0
+#define CHECKSUM_GEN_IP                 1
+#define CHECKSUM_GEN_UDP                1
+#define CHECKSUM_GEN_TCP                1
+#define CHECKSUM_CHECK_IP               1
+#define CHECKSUM_CHECK_UDP              1
+#define CHECKSUM_CHECK_TCP              1
+
+#define LWIP_TIMERS                     1
+#define LWIP_TCPIP_TIMEOUT              1
+#define LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS 1
+
+#define LWIP_STATS                      0
+#define LWIP_DEBUG                      0
+#define LWIP_NOASSERT                   0