memblock can now self re-allocate its internal buffers

memory allocated by memblock_alloc() can now be limited to a certain region.

sandbox/vm/include/socks/vm.h

@@ -0,0 +1,52 @@
+#ifndef SOCKS_VM_H_
+#define SOCKS_VM_H_
+
+#include <stddef.h>
+#include <socks/types.h>
+#include <socks/status.h>
+
+typedef enum vm_zone_id {
+	VM_ZONE_DMA		= 1u,
+	VM_ZONE_NORMAL		= 2u,
+	VM_ZONE_HIGHMEM		= 3u,
+	VM_ZONE_COUNT
+} vm_zone_id_t;
+
+typedef enum vm_memory_region_status {
+	VM_REGION_FREE		= 0x01u,
+	VM_REGION_RESERVED	= 0x02u,
+} vm_memory_region_status_t;
+
+typedef struct vm_zone_descriptor {
+	vm_zone_id_t zd_id;
+	phys_addr_t zd_base;
+	phys_addr_t zd_limit;
+} vm_zone_descriptor_t;
+
+typedef struct vm_zone {
+	unsigned z_reserved[32];
+} vm_zone_t;
+
+typedef struct vm_pg_data {
+	vm_zone_t pg_zones[VM_ZONE_COUNT];
+} vm_pg_data_t;
+
+typedef struct vm_region {
+	vm_memory_region_status_t r_status;
+	phys_addr_t r_base;
+	phys_addr_t r_limit;
+} vm_region_t;
+
+typedef enum vm_page_flags {
+	VM_PAGE_RESERVED = 0x01u,
+} vm_page_flags_t;
+
+typedef struct vm_page {
+	uint32_t p_flags; /* vm_page_flags_t bitfield */
+} __attribute__((packed)) vm_page_t;
+
+extern kern_status_t vm_bootstrap(const vm_region_t *mem_map, size_t nr_mem_map_entries);
+
+extern void vm_page_init(vm_page_t *pg);
+
+#endif