Listing 1 Reading the device tree from kernel memory

 1 /* Compile with gcc -g -o kvm kvm.c -lkvm -lelf */
 2 #include <fcntl.h>
 3 #include <sys/dditypes.h>
 4 #include <sys/ddidmareq.h>
 5 #include <sys/ddi_impldefs.h>
 6 #include <kvm.h>
 7
 8 int main(int argc, char *argv[]) {
 9    kvm_t *kmem;
10    struct dev_info *pdevnode, devnode;
11    struct nlist sym[] = { { "top_devinfo" }, { 0 } };
12
13    /* Open kernel memory */
14    kmem = kvm_open(NULL, NULL, NULL, O_RDONLY, argv[0]);
15
16    /* Find the top_devinfo symbol, a pointer to the root node */
17    kvm_nlist(kmem, sym);
18
19    /* Read in the pointer */
20    kvm_kread(kmem, sym[0].n_value, (char *) &pdevnode, sizeof(pdevnode));
21
22    /* Now read in the node itself */
23    kvm_kread(kmem, (unsigned long) pdevnode, (char *) &devnode, sizeof(devnode));
24
25    printf("Parent: 0x%08x Child: 0x%08x Sibling: 0x%08x\n",
26           devnode.devi_parent, devnode.devi_child, devnode.devi_sibling);
27
28    /* Close kernel memory */
29    kvm_close(kmem);
30 }