50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/*
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* \brief Implementation of linux/gfp.h
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* \author Norman Feske
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* \date 2015-09-09
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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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#include <lx_emul/impl/internal/addr_to_page_mapping.h>
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#include <lx_emul/impl/internal/malloc.h>
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struct page *alloc_pages(gfp_t gfp_mask, unsigned int order)
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{
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struct page *page = (struct page *)kzalloc(sizeof(struct page) * 1<<order, 0);
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size_t size = PAGE_SIZE << order;
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Genode::Ram_dataspace_capability ds_cap = Lx::backend_alloc(size, Genode::UNCACHED);
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page->addr = Genode::env()->rm_session()->attach(ds_cap);
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page->paddr = Genode::Dataspace_client(ds_cap).phys_addr();
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if (!page->addr) {
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PERR("alloc_pages: %zu failed", size);
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kfree(page);
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return 0;
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}
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Lx::Addr_to_page_mapping::insert(page);
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for (unsigned i = 0; i < 1UL<<order; i++) {
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page[i].addr = (void*)((Genode::addr_t)page->addr + i*PAGE_SIZE);
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page[i].paddr = page->paddr + i*PAGE_SIZE;
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atomic_set(&page[i]._count, 1);
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}
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return page;
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}
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void get_page(struct page *page)
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{
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atomic_inc(&page->_count);
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}
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