1 files changed, 87 insertions, 0 deletions
diff --git a/vm/vm_phys.h b/vm/vm_phys.h
new file mode 100644
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--- /dev/null
+++ b/vm/vm_phys.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2010, 2011, 2012 Richard Braun.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Physical page allocator.
+ */
+
+#ifndef _VM_VM_PHYS_H
+#define _VM_VM_PHYS_H
+
+#include <kern/types.h>
+#include <vm/vm_page.h>
+
+/*
+ * True if the vm_phys module is completely initialized, false otherwise
+ * (in which case only vm_phys_bootalloc() can be used for allocations).
+ */
+extern int vm_phys_ready;
+
+/*
+ * Load physical memory into the vm_phys module at boot time.
+ *
+ * The avail_start and avail_end parameters are used to maintain a simple
+ * heap for bootstrap allocations.
+ */
+void vm_phys_load(const char *name, vm_phys_t start, vm_phys_t end,
+                  vm_phys_t avail_start, vm_phys_t avail_end,
+                  unsigned int seglist_prio);
+
+/*
+ * Allocate one physical page.
+ *
+ * This function is used to allocate physical memory at boot time, before the
+ * vm_phys module is ready, but after the physical memory has been loaded.
+ */
+vm_phys_t vm_phys_bootalloc(void);
+
+/*
+ * Set up the vm_phys module.
+ *
+ * Once this function returns, the vm_phys module is ready, and normal
+ * allocation functions can be used.
+ */
+void vm_phys_setup(void);
+
+/*
+ * Make the given page managed by the vm_phys module.
+ *
+ * If additional memory can be made usable after the VM system is initialized,
+ * it should be reported through this function.
+ */
+void vm_phys_manage(struct vm_page *page);
+
+/*
+ * Return the page descriptor for the given physical address.
+ */
+struct vm_page * vm_phys_lookup_page(vm_phys_t pa);
+
+/*
+ * Allocate a block of 2^order physical pages.
+ */
+struct vm_page * vm_phys_alloc(unsigned int order);
+
+/*
+ * Release a block of 2^order physical pages.
+ */
+void vm_phys_free(struct vm_page *page, unsigned int order);
+
+/*
+ * Display internal information about the module.
+ */
+void vm_phys_info(void);
+
+#endif /* _VM_VM_PHYS_H */