Move thread logic to linux/thread.c, rewrite os and idle threads in asm.

linux/pci.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <inttypes.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+__attribute__((stdcall)) uint32_t pci_read(uint32_t bus, uint32_t dev, uint32_t fun, uint32_t offset, size_t len) {
+    char path[128];
+    uint32_t value = 0;
+    sprintf(path, "/sys/bus/pci/devices/%4.4u:%2.2u:%2.2u.%u/config", 0, bus, dev, fun);
+    int fd = open(path, O_RDONLY);
+    lseek(fd, offset, SEEK_SET);
+    read(fd, &value, len);
+    close(fd);
+    return value;
+}