145 lines
3.7 KiB
C++
145 lines
3.7 KiB
C++
/*
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* \brief Kernel backend for protection domains
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-11-30
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*/
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/*
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* Copyright (C) 2012-2013 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__PD_H_
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#define _CORE__INCLUDE__KERNEL__PD_H_
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/* core includes */
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#include <translation_table_allocator_tpl.h>
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#include <kernel/cpu.h>
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#include <kernel/object.h>
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namespace Genode {
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class Platform_pd;
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}
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namespace Kernel
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{
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/**
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* Controls the mode-transition page
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*
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* The mode transition page is a small memory region that is mapped by
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* every PD to the same virtual address. It contains code that acts as a
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* link between high privileged CPU mode (often called kernel) and low
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* privileged CPU mode (often called userland). The mode transition
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* control provides a simple interface to access the code from within
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* the kernel.
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*/
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struct Mode_transition_control;
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/**
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* Return the system wide mode-transition control
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*/
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Mode_transition_control * mtc();
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/**
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* Kernel backend of protection domains
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*/
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class Pd;
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}
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struct Kernel::Mode_transition_control
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{
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/**
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* Map the mode transition page to a virtual address space
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*
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* \param tt translation buffer of the address space
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* \param alloc translation table allocator used for the mapping
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*/
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void map(Genode::Translation_table * tt,
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Genode::Translation_table_allocator * alloc);
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/**
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* Continue execution of client context
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*
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* \param context targeted CPU context
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* \param cpu kernel name of targeted CPU
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* \param entry_raw raw pointer to assembly entry-code
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* \param context_ptr_base base address of client-context pointer region
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*/
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void switch_to(Cpu::Context * const context,
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unsigned const cpu,
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addr_t const entry_raw,
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addr_t const context_ptr_base);
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/**
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* Continue execution of user context
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*
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* \param context targeted CPU context
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* \param cpu kernel name of targeted CPU
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*/
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void switch_to_user(Cpu::Context * const context,
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unsigned const cpu);
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};
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class Kernel::Pd : public Cpu::Pd,
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public Kernel::Object
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{
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public:
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static constexpr unsigned max_cap_ids = 1 << (sizeof(capid_t) * 8);
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using Table = Genode::Translation_table;
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using Capid_allocator = Genode::Bit_allocator<max_cap_ids>;
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private:
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Table * const _table;
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Genode::Platform_pd * const _platform_pd;
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Capid_allocator _capid_alloc;
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Object_identity_reference_tree _cap_tree;
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public:
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/**
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* Constructor
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*
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* \param table translation table of the PD
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* \param platform_pd core object of the PD
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*/
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Pd(Table * const table, Genode::Platform_pd * const platform_pd);
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~Pd();
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/**
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* Let the CPU context 'c' join the PD
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*/
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void admit(Cpu::Context * const c);
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static capid_t syscall_create(void * const dst,
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Genode::Translation_table * tt,
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Genode::Platform_pd * const pd)
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{
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return call(call_id_new_pd(), (Call_arg)dst,
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(Call_arg)tt, (Call_arg)pd);
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}
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static void syscall_destroy(Pd * const pd) {
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call(call_id_delete_pd(), (Call_arg)pd); }
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/***************
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** Accessors **
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***************/
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Genode::Platform_pd * platform_pd() const { return _platform_pd; }
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Table * translation_table() const { return _table; }
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Capid_allocator & capid_alloc() { return _capid_alloc; }
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Object_identity_reference_tree & cap_tree() { return _cap_tree; }
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};
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#endif /* _CORE__INCLUDE__KERNEL__PD_H_ */
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