91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
/*
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* \brief Kernel-specific capability helpers and definitions
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* \author Norman Feske
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* \date 2016-06-01
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*/
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/*
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* Copyright (C) 2016-2017 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 Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__FOC__NATIVE_CAPABILITY_H_
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#define _INCLUDE__FOC__NATIVE_CAPABILITY_H_
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namespace Fiasco {
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#include <l4/sys/consts.h>
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#include <l4/sys/types.h>
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#include <l4/sys/utcb.h>
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#include <l4/sys/task.h>
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/*********************************************
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** Capability selectors controlled by core **
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*********************************************/
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/* use the same task cap selector like L4Re for compatibility in L4Linux */
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static constexpr l4_cap_idx_t TASK_CAP = L4_BASE_TASK_CAP;
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static constexpr l4_cap_idx_t DEBUG_CAP = L4_BASE_DEBUGGER_CAP;
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/*
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* To not clash with other L4Re cap selector constants (e.g.: L4Linux)
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* leave the following selectors (2-8) empty
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*/
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/* cap to parent session */
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static constexpr l4_cap_idx_t PARENT_CAP = 0xbUL << L4_CAP_SHIFT;
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/*
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* Each thread has a designated slot in the core controlled cap
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* selector area, where its ipc gate capability (for server threads),
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* its irq capability (for locks), and the capability to its pager
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* gate are stored
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*/
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/* offset to thread area */
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static constexpr l4_cap_idx_t THREAD_AREA_BASE = 0xcUL << L4_CAP_SHIFT;
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/* size of one thread slot */
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static constexpr l4_cap_idx_t THREAD_AREA_SLOT = 0x5UL << L4_CAP_SHIFT;
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/* offset to the ipc gate cap selector in the slot */
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static constexpr l4_cap_idx_t THREAD_GATE_CAP = 0;
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/* offset to the pager cap selector in the slot */
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static constexpr l4_cap_idx_t THREAD_PAGER_CAP = 0x1UL << L4_CAP_SHIFT;
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/* offset to the irq cap selector in the slot */
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static constexpr l4_cap_idx_t THREAD_IRQ_CAP = 0x2UL << L4_CAP_SHIFT;
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/* offset to the irq cap selector in the slot */
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static constexpr l4_cap_idx_t TASK_VCPU_CAP = 0x3UL << L4_CAP_SHIFT;
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/* offset to the irq cap selector in the slot */
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static constexpr l4_cap_idx_t TASK_VCPU_IRQ_CAP = 0x4UL << L4_CAP_SHIFT;
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/* shortcut to the main thread's gate cap */
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static constexpr l4_cap_idx_t MAIN_THREAD_CAP = THREAD_AREA_BASE
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+ THREAD_GATE_CAP;
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/*********************************************************
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** Capability selectors controlled by the task itself **
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*********************************************************/
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static constexpr unsigned THREAD_MAX = (1 << 7);
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static constexpr l4_cap_idx_t USER_BASE_CAP = 0x300 << L4_CAP_SHIFT;
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static_assert(USER_BASE_CAP > THREAD_MAX * THREAD_AREA_SLOT,
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"USER_BASE_CAP too small for supported maximal threads");
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struct Capability
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{
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static bool valid(l4_cap_idx_t idx) {
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return !(idx & L4_INVALID_CAP_BIT) && idx != 0; }
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};
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}
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#endif /* _INCLUDE__FOC__NATIVE_CAPABILITY_H_ */
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