Merge branch 'shell' into docs

kaleid/kernel/ke/idt.c

@@ -388,8 +388,16 @@ void KeBrkDumpRegisters(ISRFrame_t *regs)
 {
     IoDoBeepNoIdt();
 
-    bprintf(BStdOut, "\n\n"
+    size_t N = 3;
+    char *ptr = (char *)lmax((ulong)BStdDbg->buf,
+               (ulong)(BStdDbg->wp - BStdDbg->lastLF - (BStdDbg->lineLen * N)));
 
+    bprintf(BStdOut, "\n%C  Debug messages last %d lines: \n  %s\n",
+            VGA_COLOR_LIGHT_GREY,
+            N,
+            ptr);
+
+    bprintf(BStdOut,
                      "%C  RIP: %#016lx   RSP: %#016lx   RBP: %#016lx\n\n"
 
                      "  SS:  %#016lx   CS:  %#016lx   CR0: %#016lx\n"