sandbox: vm: organise pages into zoned blocks

sandbox/vm/vm_zone.c

@@ -0,0 +1,40 @@
+#include <socks/types.h>
+#include <socks/vm.h>
+#include <string.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+void vm_zone_init(vm_zone_t *z, const char *name, uintptr_t base, uintptr_t limit)
+{
+	memset(z, 0x0, sizeof *z);
+	z->z_name = name;
+
+	phys_addr_t block_start = 0;
+	int last_page_reserved = -1;
+	for (uintptr_t i = base; i < limit; i += VM_PAGE_SIZE) {
+		vm_page_t *pg = vm_page_get(i);
+		if (!pg) {
+			break;
+		}
+		
+		int this_page_reserved = (pg->p_flags & VM_PAGE_RESERVED) ? 1 : 0;
+
+		if (last_page_reserved == -1) {
+			last_page_reserved = this_page_reserved;
+		}
+
+		if (this_page_reserved == last_page_reserved) {
+			continue;
+		}
+
+		printf("%s: %zu %s pages at %" PRIxPTR "\n",
+		       name,
+		       (i - block_start) / VM_PAGE_SIZE,
+		       this_page_reserved == 1 ? "reserved" : "free",
+		       block_start);
+		
+		block_start = i;
+		vm_page_order_t order = VM_PAGE_MAX_ORDER;
+		last_page_reserved = this_page_reserved;
+	}
+}