1 files changed, 86 insertions, 0 deletions
diff --git a/vm/vm_kmem.h b/vm/vm_kmem.h
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+++ b/vm/vm_kmem.h
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+/*
+ * 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/>.
+ */
+
+#ifndef _VM_VM_KMEM_H
+#define _VM_VM_KMEM_H
+
+#include <kern/types.h>
+
+/*
+ * Special kernel addresses.
+ */
+extern char _text;
+extern char _rodata;
+extern char _data;
+extern char _bss;
+extern char _end;
+
+/*
+ * The kernel map.
+ */
+extern struct vm_map *kernel_map;
+
+/*
+ * Initialize the vm_kmem module.
+ */
+void vm_kmem_setup(void);
+
+/*
+ * Early kernel memory allocator.
+ *
+ * The main purpose of this function is to allow the allocation of the
+ * physical page table.
+ */
+unsigned long vm_kmem_bootalloc(size_t size);
+
+/*
+ * Return the range of initial virtual memory used by the kernel.
+ */
+void vm_kmem_boot_space(unsigned long *start, unsigned long *end);
+
+/*
+ * Allocate memory from the kernel map.
+ */
+unsigned long vm_kmem_alloc(size_t size);
+
+/*
+ * Release memory back to the kernel map.
+ */
+void vm_kmem_free(unsigned long addr, size_t size);
+
+/*
+ * Map physical memory in a kernel map.
+ *
+ * Return the address at which the mapped memory can be accessed. If map_addrp
+ * and/or map_sizep aren't NULL, they are updated to the address and size of
+ * the mapping created.
+ *
+ * This is a convenience function for modules that must map random regions of
+ * physical memory, and as such, it doesn't expect a page-aligned input range.
+ *
+ * TODO When mapping attributes are implemented, make this function disable
+ * caching on the mapping.
+ */
+void * vm_kmem_map_pa(vm_phys_t addr, size_t size, unsigned long *map_addrp,
+                      size_t *map_sizep);
+
+/*
+ * Unmap physical memory from a kernel map.
+ */
+void vm_kmem_unmap_pa(unsigned long map_addr, size_t map_size);
+
+#endif /* _VM_VM_KMEM_H */