137 lines
4.2 KiB
C++
137 lines
4.2 KiB
C++
/*
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* \brief Linux platform
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* \author Christian Helmuth
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* \author Norman Feske
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* \date 2007-09-10
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*/
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/*
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* Copyright (C) 2007-2017 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 _CORE__INCLUDE__PLATFORM_H_
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#define _CORE__INCLUDE__PLATFORM_H_
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#include <base/allocator_avl.h>
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#include <base/lock_guard.h>
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#include <platform_generic.h>
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#include <platform_pd.h>
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#include <platform_thread.h>
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#include <synced_range_allocator.h>
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#include <assertion.h>
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namespace Genode {
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using namespace Genode;
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class Platform : public Platform_generic
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{
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private:
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/**
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* Allocator for core-internal meta data
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*/
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Synced_range_allocator<Allocator_avl> _core_mem_alloc;
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Rom_fs _dummy_rom_fs { };
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struct Dummy_allocator : Range_allocator
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{
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void free(void *, size_t) override { ASSERT_NEVER_CALLED; }
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bool need_size_for_free() const override { ASSERT_NEVER_CALLED; }
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size_t consumed() const override { ASSERT_NEVER_CALLED; }
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size_t overhead(size_t) const override { ASSERT_NEVER_CALLED; }
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int add_range (addr_t, size_t ) override { ASSERT_NEVER_CALLED; }
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int remove_range(addr_t, size_t ) override { ASSERT_NEVER_CALLED; }
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void free(void *) override { ASSERT_NEVER_CALLED; }
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size_t avail() const override { ASSERT_NEVER_CALLED; }
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bool valid_addr(addr_t ) const override { ASSERT_NEVER_CALLED; }
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bool alloc(size_t, void **) override { ASSERT_NEVER_CALLED; }
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Alloc_return alloc_aligned(size_t, void **, int, addr_t, addr_t) override
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{ ASSERT_NEVER_CALLED; }
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Alloc_return alloc_addr(size_t, addr_t) override
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{ ASSERT_NEVER_CALLED; }
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} _dummy_alloc { };
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/**
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* Allocator for pseudo physical memory
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*/
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struct Pseudo_ram_allocator : Range_allocator
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{
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bool alloc(size_t, void **out_addr) override
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{
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*out_addr = 0;
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return true;
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}
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Alloc_return alloc_aligned(size_t, void **out_addr, int,
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addr_t, addr_t) override
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{
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*out_addr = 0;
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return Alloc_return::OK;
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}
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Alloc_return alloc_addr(size_t, addr_t) override
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{
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return Alloc_return::OK;
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}
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int add_range(addr_t, size_t) override { return 0; }
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int remove_range(addr_t, size_t) override { return 0; }
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void free(void *) override { }
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void free(void *, size_t) override { }
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size_t avail() const override { return ~0; }
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bool valid_addr(addr_t) const override { return true; }
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size_t overhead(size_t) const override { return 0; }
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bool need_size_for_free() const override { return true; }
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} _ram_alloc { };
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public:
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/**
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* Constructor
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*/
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Platform();
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/********************************
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** Generic platform interface **
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********************************/
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Range_allocator &core_mem_alloc() override { return _core_mem_alloc; }
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Range_allocator &ram_alloc() override { return _ram_alloc; }
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Range_allocator &io_mem_alloc() override { return _dummy_alloc; }
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Range_allocator &io_port_alloc() override { return _dummy_alloc; }
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Range_allocator &irq_alloc() override { return _dummy_alloc; }
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Range_allocator ®ion_alloc() override { return _dummy_alloc; }
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addr_t vm_start() const override { return 0; }
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size_t vm_size() const override { return 0; }
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Rom_fs &rom_fs() override { return _dummy_rom_fs; }
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/*
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* On Linux, the maximum number of capabilities is primarily
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* constrained by the limited number of file descriptors within
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* core. Each dataspace and and each thread consumes one
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* descriptor. However, all capabilies managed by the same
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* entrypoint share the same file descriptor such that the fd
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* limit would be an overly pessimistic upper bound.
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*
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* Hence, we define the limit somewhat arbitrary on Linux and
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* accept that scenarios may break when reaching core's fd limit.
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*/
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size_t max_caps() const override { return 10000; }
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void wait_for_exit() override;
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};
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}
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#endif /* _CORE__INCLUDE__PLATFORM_H_ */
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