130 lines
4.7 KiB
C
130 lines
4.7 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 _MIPS_VM_H_
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#define _MIPS_VM_H_
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/*
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* Machine-dependent VM system definitions.
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*/
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#define PAGE_SIZE 4096 /* size of VM page */
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#define PAGE_FRAME 0xfffff000 /* mask for getting page number from addr */
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/*
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* MIPS-I hardwired memory layout:
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* 0xc0000000 - 0xffffffff kseg2 (kernel, tlb-mapped)
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* 0xa0000000 - 0xbfffffff kseg1 (kernel, unmapped, uncached)
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* 0x80000000 - 0x9fffffff kseg0 (kernel, unmapped, cached)
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* 0x00000000 - 0x7fffffff kuseg (user, tlb-mapped)
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*
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* (mips32 is a little different)
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*/
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#define MIPS_KUSEG 0x00000000
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#define MIPS_KSEG0 0x80000000
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#define MIPS_KSEG1 0xa0000000
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#define MIPS_KSEG2 0xc0000000
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/*
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* The first 512 megs of physical space can be addressed in both kseg0 and
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* kseg1. We use kseg0 for the kernel. This macro returns the kernel virtual
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* address of a given physical address within that range. (We assume we're
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* not using systems with more physical space than that anyway.)
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*
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* N.B. If you, say, call a function that returns a paddr or 0 on error,
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* check the paddr for being 0 *before* you use this macro. While paddr 0
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* is not legal for memory allocation or memory management (it holds
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* exception handler code) when converted to a vaddr it's *not* NULL, *is*
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* a valid address, and will make a *huge* mess if you scribble on it.
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*/
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#define PADDR_TO_KVADDR(paddr) ((paddr)+MIPS_KSEG0)
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/*
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* The top of user space. (Actually, the address immediately above the
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* last valid user address.)
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*/
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#define USERSPACETOP MIPS_KSEG0
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/*
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* The starting value for the stack pointer at user level. Because
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* the stack is subtract-then-store, this can start as the next
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* address after the stack area.
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*
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* We put the stack at the very top of user virtual memory because it
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* grows downwards.
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*/
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#define USERSTACK USERSPACETOP
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/*
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* Interface to the low-level module that looks after the amount of
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* physical memory we have.
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*
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* ram_getsize returns one past the highest valid physical
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* address. (This value is page-aligned.) The extant RAM ranges from
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* physical address 0 up to but not including this address.
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*
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* ram_getfirstfree returns the lowest valid physical address. (It is
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* also page-aligned.) Memory at this address and above is available
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* for use during operation, and excludes the space the kernel is
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* loaded into and memory that is grabbed in the very early stages of
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* bootup. Memory below this address is already in use and should be
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* reserved or otherwise not managed by the VM system. It should be
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* called exactly once when the VM system initializes to take over
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* management of physical memory.
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*
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* ram_stealmem can be used before ram_getsize is called to allocate
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* memory that cannot be freed later. This is intended for use early
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* in bootup before VM initialization is complete.
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*/
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void ram_bootstrap(void);
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paddr_t ram_stealmem(unsigned long npages);
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paddr_t ram_getsize(void);
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paddr_t ram_getfirstfree(void);
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/*
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* TLB shootdown bits.
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*
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* We'll take up to 16 invalidations before just flushing the whole TLB.
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*/
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struct tlbshootdown {
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/*
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* Change this to what you need for your VM design.
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*/
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int ts_placeholder;
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};
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#define TLBSHOOTDOWN_MAX 16
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#endif /* _MIPS_VM_H_ */
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