arch/m68k/ifpsp060/os.S

Source file repositories/reference/linux-study-clean/arch/m68k/ifpsp060/os.S

File Facts

System
Linux kernel
Corpus path
arch/m68k/ifpsp060/os.S
Extension
.S
Size
10536 bytes
Lines
397
Domain
Architecture Layer
Bucket
arch/m68k
Inferred role
Architecture Layer: arch/m68k
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
|M68000 Hi-Performance Microprocessor Division
|M68060 Software Package
|Production Release P1.00 -- October 10, 1994
|
|M68060 Software Package Copyright © 1993, 1994 Motorola Inc.  All rights reserved.
|
|THE SOFTWARE is provided on an "AS IS" basis and without warranty.
|To the maximum extent permitted by applicable law,
|MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
|INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
|and any warranty against infringement with regard to the SOFTWARE
|(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
|
|To the maximum extent permitted by applicable law,
|IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
|(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
|BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
|ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
|Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
|
|You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
|so long as this entire notice is retained without alteration in any modified and/or
|redistributed versions, and that such modified versions are clearly identified as such.
|No licenses are granted by implication, estoppel or otherwise under any patents
|or trademarks of Motorola, Inc.
|~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| os.s
|
| This file contains:
|	- example "Call-Out"s required by both the ISP and FPSP.
|

#include <linux/linkage.h>

|################################
| EXAMPLE CALL-OUTS		#
|				#
| _060_dmem_write()		#
| _060_dmem_read()		#
| _060_imem_read()		#
| _060_dmem_read_byte()		#
| _060_dmem_read_word()		#
| _060_dmem_read_long()		#
| _060_imem_read_word()		#
| _060_imem_read_long()		#
| _060_dmem_write_byte()	#
| _060_dmem_write_word()	#
| _060_dmem_write_long()	#
|				#
| _060_real_trace()		#
| _060_real_access()		#
|################################

|
| Each IO routine checks to see if the memory write/read is to/from user
| or supervisor application space. The examples below use simple "move"
| instructions for supervisor mode applications and call _copyin()/_copyout()
| for user mode applications.
| When installing the 060SP, the _copyin()/_copyout() equivalents for a
| given operating system should be substituted.
|
| The addresses within the 060SP are guaranteed to be on the stack.
| The result is that Unix processes are allowed to sleep as a consequence
| of a page fault during a _copyout.
|
| Linux/68k: The _060_[id]mem_{read,write}_{byte,word,long} functions
| (i.e. all the known length <= 4) are implemented by single moves
| statements instead of (more expensive) copy{in,out} calls, if

Annotation

Implementation Notes