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freebsd-dev/sys/powerpc/include/asm.h
Justin Hibbits e683c328f8 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: asm.h,v 1.6.18.1 2000/07/25 08:37:14 kleink Exp $
* $FreeBSD$
*/
#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
#include <sys/cdefs.h>
#if defined(PIC) && !defined(__powerpc64__)
#define PIC_PROLOGUE XXX
#define PIC_EPILOGUE XXX
#define PIC_PLT(x) x@plt
#ifdef __STDC__
#define PIC_GOT(x) XXX
#else /* not __STDC__ */
#define PIC_GOT(x) XXX
#endif /* __STDC__ */
#else
#define PIC_PROLOGUE
#define PIC_EPILOGUE
#define PIC_PLT(x) x
#define PIC_GOT(x) x
#endif
#define CNAME(csym) csym
#define ASMNAME(asmsym) asmsym
#ifdef __powerpc64__
#define HIDENAME(asmsym) __CONCAT(_,asmsym)
#else
#define HIDENAME(asmsym) __CONCAT(.,asmsym)
#endif
#if !defined(_CALL_ELF) || _CALL_ELF == 1
#ifdef _KERNEL
/* ELFv1 kernel uses global dot symbols */
#define DOT_LABEL(name) __CONCAT(.,name)
#define TYPE_ENTRY(name) .size name,24; \
.type DOT_LABEL(name),@function; \
.globl DOT_LABEL(name);
#define END_SIZE(name) .size DOT_LABEL(name),.-DOT_LABEL(name);
#else /* !_KERNEL */
/* ELFv1 user code uses local function entry points */
#define DOT_LABEL(name) __CONCAT(.L.,name)
#define TYPE_ENTRY(name) .type name,@function;
#define END_SIZE(name) .size name,.-DOT_LABEL(name);
#endif /* _KERNEL */
#else
/* ELFv2 doesn't have any of this complication */
#define DOT_LABEL(name) name
#define TYPE_ENTRY(name) .type name,@function;
#define END_SIZE(name) .size name,.-DOT_LABEL(name);
#endif
#define _GLOBAL(name) \
.data; \
.p2align 2; \
.globl name; \
name:
#ifdef __powerpc64__
#define TOC_NAME_FOR_REF(name) __CONCAT(.L,name)
#define TOC_REF(name) TOC_NAME_FOR_REF(name)@toc
#define TOC_ENTRY(name) \
.section ".toc","aw"; \
TOC_NAME_FOR_REF(name): \
.tc name[TC],name
#endif
#ifdef __powerpc64__
#if !defined(_CALL_ELF) || _CALL_ELF == 1
#define _ENTRY(name) \
.section ".text"; \
.p2align 2; \
.globl name; \
.section ".opd","aw"; \
.p2align 3; \
name: \
.quad DOT_LABEL(name),.TOC.@tocbase,0; \
.previous; \
.p2align 4; \
TYPE_ENTRY(name) \
DOT_LABEL(name):
#else
#define _ENTRY(name) \
.text; \
.p2align 4; \
.globl name; \
.type name,@function; \
name: \
addis %r2, %r12, (.TOC.-name)@ha; \
addi %r2, %r2, (.TOC.-name)@l; \
.localentry name, .-name;
#endif
#define _END(name) \
.long 0; \
.byte 0,0,0,0,0,0,0,0; \
END_SIZE(name)
#define LOAD_ADDR(reg, var) \
lis reg, var@highest; \
ori reg, reg, var@higher; \
rldicr reg, reg, 32, 31; \
oris reg, reg, var@h; \
ori reg, reg, var@l;
#else /* !__powerpc64__ */
#define _ENTRY(name) \
.text; \
.p2align 4; \
.globl name; \
.type name,@function; \
name:
#define _END(name)
#define LOAD_ADDR(reg, var) \
lis reg, var@ha; \
ori reg, reg, var@l;
#endif /* __powerpc64__ */
#if defined(PROF) || (defined(_KERNEL) && defined(GPROF))
# ifdef __powerpc64__
# define _PROF_PROLOGUE mflr 0; \
std 3,48(1); \
std 4,56(1); \
std 5,64(1); \
std 0,16(1); \
stdu 1,-112(1); \
bl _mcount; \
nop; \
ld 0,112+16(1); \
ld 3,112+48(1); \
ld 4,112+56(1); \
ld 5,112+64(1); \
mtlr 0; \
addi 1,1,112
# else
# define _PROF_PROLOGUE mflr 0; stw 0,4(1); bl _mcount
# endif
#else
# define _PROF_PROLOGUE
#endif
#define ASENTRY(y) _ENTRY(ASMNAME(y)); _PROF_PROLOGUE
#define END(y) _END(CNAME(y))
#define ENTRY(y) _ENTRY(CNAME(y)); _PROF_PROLOGUE
#define GLOBAL(y) _GLOBAL(CNAME(y))
#define ASENTRY_NOPROF(y) _ENTRY(ASMNAME(y))
#define ENTRY_NOPROF(y) _ENTRY(CNAME(y))
#define ASMSTR .asciz
#define RCSID(x) .text; .asciz x
#undef __FBSDID
#if !defined(lint) && !defined(STRIP_FBSDID)
#define __FBSDID(s) .ident s
#else
#define __FBSDID(s) /* nothing */
#endif /* not lint and not STRIP_FBSDID */
#define WEAK_REFERENCE(sym, alias) \
.weak alias; \
.equ alias,sym
#ifdef __STDC__
#define WARN_REFERENCES(_sym,_msg) \
.section .gnu.warning. ## _sym ; .ascii _msg ; .text
#else
#define WARN_REFERENCES(_sym,_msg) \
.section .gnu.warning./**/_sym ; .ascii _msg ; .text
#endif /* __STDC__ */
#endif /* !_MACHINE_ASM_H_ */
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