feat: Eliminate all stubs; implement real RTL8139 physical DMA ping, dmesg ring buffer, live scheduler thread list, and physical RAM stats

include/abi/syscalls.h

@@ -20,6 +20,9 @@
 #define SYS_FB_INFO         15  /* Query Limine Linear Framebuffer */
 #define SYS_PROC_KILL       16  /* Terminate process/thread by PID */
 #define SYS_DMESG           17  /* Retrieve kernel boot log */
+#define SYS_PROC_LIST       18  /* Query active kernel thread list */
+#define SYS_PROC_SPAWN      19  /* Dynamically load and run ELF process */
+#define SYS_DMA_ALLOC       20  /* Allocate physical DMA buffer */
 
 #ifndef __ASSEMBLER__
 
@@ -27,6 +30,21 @@
 extern "C" {
 #endif
 
+typedef struct thread_info {
+    uint64_t tid;
+    char     name[32];
+    uint32_t state; // 0=Unused, 1=Ready, 2=Running, 3=Blocked, 4=Dead
+    uint64_t cpu_ticks;
+    uint64_t user_rip;
+    uint64_t user_rsp;
+} thread_info_t;
+
+typedef struct dma_alloc_data {
+    uint64_t virt_addr;
+    uint64_t phys_addr;
+    uint64_t size_bytes;
+} dma_alloc_data_t;
+
 typedef struct fb_info_data {
     uint64_t fb_addr;
     uint64_t width;