2015-05-08 12:18:09 +02:00
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/*
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* \brief Utilities for creating seL4 kernel objects
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* \author Norman Feske
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* \date 2015-05-08
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*/
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/*
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* Copyright (C) 2015 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _CORE__INCLUDE__KERNEL_OBJECT_H_
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#define _CORE__INCLUDE__KERNEL_OBJECT_H_
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/* core includes */
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#include <untyped_memory.h>
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namespace Kernel_object {
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using Genode::Untyped_address;
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using Genode::Untyped_memory;
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using Genode::Range_allocator;
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struct Tcb
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{
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enum { SEL4_TYPE = seL4_TCBObject, SIZE_LOG2 = 12 };
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static char const *name() { return "TCB"; }
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};
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struct Endpoint
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{
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enum { SEL4_TYPE = seL4_EndpointObject, SIZE_LOG2 = 4 };
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static char const *name() { return "endpoint"; }
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};
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struct Cnode
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{
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enum { SEL4_TYPE = seL4_CapTableObject, SIZE_LOG2 = 4 };
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static char const *name() { return "cnode"; }
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};
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struct Page_table
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{
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enum { SEL4_TYPE = seL4_IA32_PageTableObject, SIZE_LOG2 = 12 };
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static char const *name() { return "page table"; }
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};
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2015-05-12 12:48:03 +02:00
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struct Page_directory
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{
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enum { SEL4_TYPE = seL4_IA32_PageDirectoryObject, SIZE_LOG2 = 12 };
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static char const *name() { return "page directory"; }
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};
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2015-05-08 12:18:09 +02:00
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/**
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* Create kernel object from untyped memory
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*
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* \param KOBJ kernel-object description
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* \param phys_alloc allocator for untyped memory
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* \param dst_cnode_sel CNode selector where to store the cap pointing to
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* the new kernel object
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* \param dst_idx designated index of cap selector within 'dst_cnode'
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* \param size_log2 size of kernel object in bits, only needed for
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* variable-sized objects like CNodes
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*
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* \throw Phys_alloc_failed
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* \throw Untyped_address::Lookup_failed
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*
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* The kernel-object description is a policy type that contains enum
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* definitions for 'SEL4_TYPE' and 'SIZE_LOG2', and a static function
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* 'name' that returns the type name as a char const pointer.
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*/
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template <typename KOBJ>
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static Untyped_address create(Range_allocator &phys_alloc,
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unsigned dst_cnode_sel,
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unsigned dst_idx,
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size_t size_log2 = 0)
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{
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Untyped_address const untyped_addr =
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Untyped_memory::alloc_log2(phys_alloc, KOBJ::SIZE_LOG2 + size_log2);
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seL4_Untyped const service = untyped_addr.sel();
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int const type = KOBJ::SEL4_TYPE;
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int const offset = untyped_addr.offset();
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int const size_bits = size_log2;
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seL4_CNode const root = dst_cnode_sel;
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int const node_index = 0;
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int const node_depth = 0;
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int const node_offset = dst_idx;
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int const num_objects = 1;
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int const ret = seL4_Untyped_RetypeAtOffset(service,
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type,
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offset,
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size_bits,
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root,
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node_index,
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node_depth,
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node_offset,
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num_objects);
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if (ret != 0)
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PERR("seL4_Untyped_RetypeAtOffset (%s) returned %d",
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KOBJ::name(), ret);
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return untyped_addr;
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}
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};
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#endif /* _CORE__INCLUDE__KERNEL_OBJECT_H_ */
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