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95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
#pragma once
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/* Copyright © 2011 Fritz Grimpen
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* Copyright © 2013 Lukas Martini
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*
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* This file is part of Xelix.
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*
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* Xelix is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Xelix is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Xelix. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <lib/generic.h>
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struct vmem_context;
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struct vmem_page
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{
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enum
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{
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VMEM_SECTION_STACK, /* Initial stack */
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VMEM_SECTION_CODE, /* Contains program code and is read-only */
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VMEM_SECTION_DATA, /* Contains static data */
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VMEM_SECTION_HEAP, /* Allocated by brk(2) at runtime */
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VMEM_SECTION_MMAP, /* Allocated by mmap(2) at runtime */
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VMEM_SECTION_KERNEL, /* Contains kernel-internal data */
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VMEM_SECTION_UNMAPPED /* Unmapped */
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} section;
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bool readonly:1;
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bool cow:1; /* Copy-on-Write mechanism */
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bool allocated:1;
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void *cow_src_addr;
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void *virt_addr;
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void *phys_addr;
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};
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typedef void (*vmem_iterator_t)(struct vmem_context *, struct vmem_page *, uint32_t);
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/* Initialize vmem_kernelContext for paging_init() */
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void vmem_init();
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struct vmem_context *vmem_kernelContext;
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struct vmem_context *vmem_currentContext;
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struct vmem_context *vmem_processContext;
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void *vmem_faultAddress;
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/* Some callbacks for magic functions */
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void (*vmem_applyPage)(struct vmem_context *, struct vmem_page *);
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/* Generate new page context */
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struct vmem_context *vmem_new();
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struct vmem_page *vmem_new_page();
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int vmem_add_page(struct vmem_context *ctx, struct vmem_page *pg);
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struct vmem_page *vmem_get_page_phys(struct vmem_context *ctx, void *phys_addr);
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struct vmem_page *vmem_get_page_virt(struct vmem_context *ctx, void *virt_addr);
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struct vmem_page *vmem_get_page(struct vmem_context *ctx, uint32_t offset);
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/* Remove pages in a specific context by physical or virtual address */
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struct vmem_page *vmem_rm_page_phys(struct vmem_context *ctx, void *phys_addr);
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struct vmem_page *vmem_rm_page_virt(struct vmem_context *ctx, void *virt_addr);
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/* Iterator */
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int vmem_iterate(struct vmem_context *ctx, vmem_iterator_t callback);
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uint32_t vmem_count_pages(struct vmem_context *ctx);
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void vmem_dump_page(struct vmem_page *pg);
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void vmem_dump(struct vmem_context *ctx);
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void vmem_handle_fault(uint32_t code, void *addr, void *instruction);
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/* Get/Set cached paging context */
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void vmem_set_cache(struct vmem_context *ctx, void *cache);
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void *vmem_get_cache(struct vmem_context *ctx);
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#ifdef __i386__
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#define PAGE_SIZE 4096
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#define VMEM_ALIGN(x) (typeof(x))(((intptr_t)(x) & 0xFFFFF000) + 0x1000)
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#define VMEM_ALIGN_DOWN(x) (typeof(x))( \
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((intptr_t)(x) - ((intptr_t)(x) % PAGE_SIZE)))
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#else
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#define PAGE_SIZE 0
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#define VMEM_ALIGN(x) (x)
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#endif
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