133 lines
4.8 KiB
C
133 lines
4.8 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _ADDRSPACE_H_
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#define _ADDRSPACE_H_
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/*
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* Address space structure and operations.
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*/
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#include <vm.h>
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#include "opt-dumbvm.h"
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struct vnode;
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/*
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* Address space - data structure associated with the virtual memory
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* space of a process.
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*
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* You write this.
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*/
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struct addrspace {
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#if OPT_DUMBVM
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vaddr_t as_vbase1;
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paddr_t as_pbase1;
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size_t as_npages1;
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vaddr_t as_vbase2;
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paddr_t as_pbase2;
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size_t as_npages2;
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paddr_t as_stackpbase;
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#else
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/* Put stuff here for your VM system */
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#endif
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};
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/*
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* Functions in addrspace.c:
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*
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* as_create - create a new empty address space. You need to make
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* sure this gets called in all the right places. You
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* may find you want to change the argument list. May
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* return NULL on out-of-memory error.
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*
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* as_copy - create a new address space that is an exact copy of
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* an old one. Probably calls as_create to get a new
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* empty address space and fill it in, but that's up to
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* you.
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*
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* as_activate - make curproc's address space the one currently
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* "seen" by the processor.
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*
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* as_deactivate - unload curproc's address space so it isn't
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* currently "seen" by the processor. This is used to
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* avoid potentially "seeing" it while it's being
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* destroyed.
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*
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* as_destroy - dispose of an address space. You may need to change
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* the way this works if implementing user-level threads.
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*
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* as_define_region - set up a region of memory within the address
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* space.
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*
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* as_prepare_load - this is called before actually loading from an
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* executable into the address space.
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*
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* as_complete_load - this is called when loading from an executable
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* is complete.
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*
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* as_define_stack - set up the stack region in the address space.
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* (Normally called *after* as_complete_load().) Hands
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* back the initial stack pointer for the new process.
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*
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* Note that when using dumbvm, addrspace.c is not used and these
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* functions are found in dumbvm.c.
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*/
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struct addrspace *as_create(void);
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int as_copy(struct addrspace *src, struct addrspace **ret);
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void as_activate(void);
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void as_deactivate(void);
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void as_destroy(struct addrspace *);
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int as_define_region(struct addrspace *as,
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vaddr_t vaddr, size_t sz,
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int readable,
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int writeable,
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int executable);
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int as_prepare_load(struct addrspace *as);
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int as_complete_load(struct addrspace *as);
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int as_define_stack(struct addrspace *as, vaddr_t *initstackptr);
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/*
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* Functions in loadelf.c
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* load_elf - load an ELF user program executable into the current
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* address space. Returns the entry point (initial PC)
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* in the space pointed to by ENTRYPOINT.
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*/
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int load_elf(struct vnode *v, vaddr_t *entrypoint);
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#endif /* _ADDRSPACE_H_ */
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