feat(pager): resolve write faults and recycle scrubbed frames

split.h

@@ -0,0 +1,43 @@
+#ifndef SPLIT_H
+#define SPLIT_H
+#include <microkit.h>
+#include <stdint.h>
+
+#define PAGES 4u
+#define CLIENTS 2u
+#define SLOTS (PAGES * CLIENTS)
+#define FRAMES (PAGES + SLOTS)
+#define BYTES 4096u
+#define BASE 0x40000000ul
+#define BACKING 0x60000000ul
+#define TASK 0x50000000ul
+#define LIMIT 255u
+
+struct job {
+  unsigned page, length;
+  char text[LIMIT + 1];
+};
+
+static inline void number(unsigned long n) {
+  char s[24];
+  unsigned i = sizeof(s) - 1;
+  s[i] = 0;
+  do {
+    s[--i] = '0' + n % 10;
+    n /= 10;
+  } while (n);
+  microkit_dbg_puts(s + i);
+}
+
+static inline unsigned char seed(unsigned page, unsigned offset) {
+  return (page * 17u + offset) % 256u;
+}
+
+static inline void require(int ok, const char *message) {
+  if (ok) return;
+  microkit_dbg_puts("@error ");
+  microkit_dbg_puts(message);
+  microkit_dbg_puts("\n");
+  for (;;) seL4_Yield();
+}
+#endif