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freebsd-skq/sys/powerpc/include/vmparam.h
jhibbits a7c24c425b Introduce 64-bit PowerPC Book-E support 
Extend the Book-E pmap to support 64-bit operation.  Much of this was taken from
Juniper's Junos FreeBSD port.  It uses a 3-level page table (page directory
list -- PP2D, page directory, page table), but has gaps in the page directory
list where regions will repeat, due to the design of the PP2D hash (a 20-bit gap
between the two parts of the index).  In practice this may not be a problem
given the expanded address space.  However, an alternative to this would be to
use a 4-level page table, like Linux, and possibly reduce the available address
space; Linux appears to use a 46-bit address space.  Alternatively, a cache of
page directory pointers could be used to keep the overall design as-is, but
remove the gaps in the address space.

This includes a new kernel config for 64-bit QorIQ SoCs, based on MPC85XX, with
the following notes:
* The DPAA driver has not yet been ported to 64-bit so is not included in the
  kernel config.
* This has been tested on the AmigaOne X5000, using a MD_ROOT compiled in
  (total size kernel+mdroot must be under 64MB).
* This can run both 32-bit and 64-bit processes, and has even been tested to run
  a 32-bit init with 64-bit children.

Many thanks to stevek and marcel for getting Juniper's FreeBSD patches open
sourced to be used here, and to stevek for reviewing, and providing some
historical contexts on quirks of the code.

Reviewed by:	stevek
Obtained from:	Juniper (in part)
MFC after:	2 months
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D9433
2017-03-17 21:40:14 +00:00

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/*-
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $NetBSD: vmparam.h,v 1.11 2000/02/11 19:25:16 thorpej Exp $
* $FreeBSD$
*/
#ifndef _MACHINE_VMPARAM_H_
#define _MACHINE_VMPARAM_H_
#define USRSTACK SHAREDPAGE
#ifndef MAXTSIZ
#define MAXTSIZ (1*1024*1024*1024) /* max text size */
#endif
#ifndef DFLDSIZ
#define DFLDSIZ (128*1024*1024) /* default data size */
#endif
#ifndef MAXDSIZ
#define MAXDSIZ (1*1024*1024*1024) /* max data size */
#endif
#ifndef DFLSSIZ
#define DFLSSIZ (8*1024*1024) /* default stack size */
#endif
#ifndef MAXSSIZ
#define MAXSSIZ (64*1024*1024) /* max stack size */
#endif
#ifdef AIM
#define VM_MAXUSER_ADDRESS32 ((vm_offset_t)0xfffff000)
#else
#define VM_MAXUSER_ADDRESS32 ((vm_offset_t)0x7ffff000)
#endif
/*
* Would like to have MAX addresses = 0, but this doesn't (currently) work
*/
#if !defined(LOCORE)
#ifdef __powerpc64__
#define VM_MIN_ADDRESS (0x0000000000000000UL)
#ifdef AIM
#define VM_MAXUSER_ADDRESS (0xfffffffffffff000UL)
#else
#define VM_MAXUSER_ADDRESS (0x7ffffffffffff000UL)
#endif
#define VM_MAX_ADDRESS (0xffffffffffffffffUL)
#else
#define VM_MIN_ADDRESS ((vm_offset_t)0)
#define VM_MAXUSER_ADDRESS VM_MAXUSER_ADDRESS32
#define VM_MAX_ADDRESS ((vm_offset_t)0xffffffff)
#endif
#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
#else /* LOCORE */
#ifdef BOOKE
#define VM_MIN_ADDRESS 0
#ifdef __powerpc64__
#define VM_MAXUSER_ADDRESS 0x7ffffffffffff000
#else
#define VM_MAXUSER_ADDRESS 0x7ffff000
#endif
#endif
#endif /* LOCORE */
#define FREEBSD32_SHAREDPAGE (VM_MAXUSER_ADDRESS32 - PAGE_SIZE)
#define FREEBSD32_USRSTACK FREEBSD32_SHAREDPAGE
#ifdef __powerpc64__
#define VM_MIN_KERNEL_ADDRESS 0xc000000000000000UL
#define VM_MAX_KERNEL_ADDRESS 0xc0000001c7ffffffUL
#define VM_MAX_SAFE_KERNEL_ADDRESS VM_MAX_KERNEL_ADDRESS
#endif
#ifdef AIM
#define KERNBASE 0x00100000UL /* start of kernel virtual */
#ifndef __powerpc64__
#define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)KERNEL_SR << ADDR_SR_SHFT)
#define VM_MAX_SAFE_KERNEL_ADDRESS (VM_MIN_KERNEL_ADDRESS + 2*SEGMENT_LENGTH -1)
#define VM_MAX_KERNEL_ADDRESS (VM_MIN_KERNEL_ADDRESS + 3*SEGMENT_LENGTH - 1)
#endif
/*
* Use the direct-mapped BAT registers for UMA small allocs. This
* takes pressure off the small amount of available KVA.
*/
#define UMA_MD_SMALL_ALLOC
#else /* Book-E */
#ifdef __powerpc64__
#ifndef LOCORE
#define KERNBASE 0xc000000000000000UL /* start of kernel virtual */
#else
#define KERNBASE 0xc000000000000000 /* start of kernel virtual */
#endif
#else
#define KERNBASE 0xc0000000 /* start of kernel virtual */
#define VM_MIN_KERNEL_ADDRESS KERNBASE
#define VM_MAX_KERNEL_ADDRESS 0xffffefff
#define VM_MAX_SAFE_KERNEL_ADDRESS VM_MAX_KERNEL_ADDRESS
#endif
#endif /* AIM/E500 */
#if !defined(LOCORE)
struct pmap_physseg {
struct pv_entry *pvent;
char *attrs;
};
#endif
#define VM_PHYSSEG_MAX 16 /* 1? */
/*
* The physical address space is densely populated on 32-bit systems,
* but may not be on 64-bit ones.
*/
#ifdef __powerpc64__
#define VM_PHYSSEG_SPARSE
#else
#define VM_PHYSSEG_DENSE
#endif
/*
* Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool
* from which physical pages are allocated and VM_FREEPOOL_DIRECT is
* the pool from which physical pages for small UMA objects are
* allocated.
*/
#define VM_NFREEPOOL 2
#define VM_FREEPOOL_DEFAULT 0
#define VM_FREEPOOL_DIRECT 1
/*
* Create one free page list.
*/
#define VM_NFREELIST 1
#define VM_FREELIST_DEFAULT 0
/*
* The largest allocation size is 4MB.
*/
#define VM_NFREEORDER 11
/*
* Disable superpage reservations.
*/
#ifndef VM_NRESERVLEVEL
#define VM_NRESERVLEVEL 0
#endif
#ifndef VM_INITIAL_PAGEIN
#define VM_INITIAL_PAGEIN 16
#endif
#ifndef SGROWSIZ
#define SGROWSIZ (128UL*1024) /* amount to grow stack */
#endif
/*
* How many physical pages per kmem arena virtual page.
*/
#ifndef VM_KMEM_SIZE_SCALE
#define VM_KMEM_SIZE_SCALE (3)
#endif
/*
* Optional floor (in bytes) on the size of the kmem arena.
*/
#ifndef VM_KMEM_SIZE_MIN
#define VM_KMEM_SIZE_MIN (12 * 1024 * 1024)
#endif
/*
* Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
* usable KVA space.
*/
#ifndef VM_KMEM_SIZE_MAX
#define VM_KMEM_SIZE_MAX ((VM_MAX_SAFE_KERNEL_ADDRESS - \
VM_MIN_KERNEL_ADDRESS + 1) * 2 / 5)
#endif
#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
/*
* On 32-bit OEA, the only purpose for which sf_buf is used is to implement
* an opaque pointer required by the machine-independent parts of the kernel.
* That pointer references the vm_page that is "mapped" by the sf_buf. The
* actual mapping is provided by the direct virtual-to-physical mapping.
*
* On OEA64 and Book-E, we need to do something a little more complicated. Use
* the runtime-detected hw_direct_map to pick between the two cases. Our
* friends in vm_machdep.c will do the same to ensure nothing gets confused.
*/
#define SFBUF
#define SFBUF_NOMD
#define SFBUF_OPTIONAL_DIRECT_MAP hw_direct_map
#define SFBUF_PHYS_DMAP(x) (x)
#endif /* _MACHINE_VMPARAM_H_ */
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