patch-1.3.94 linux/arch/m68k/ifpsp060/isp.doc

• Lines: 219
• Date: Mon Jan 8 22:08:19 1996
• Orig file: v1.3.93/linux/arch/m68k/ifpsp060/isp.doc
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/arch/m68k/ifpsp060/isp.doc linux/arch/m68k/ifpsp060/isp.doc
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+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+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.
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+68060 INTEGER SOFTWARE PACKAGE (Kernel version)
+------------------------------------------------
+
+The file isp.sa contains the 68060 Integer Software Package.
+This package is essentially an exception handler that can be
+integrated into an operating system to handle the "Unimplemented
+Integer Instruction" exception vector #61.
+This exception is taken when any of the integer instructions
+not hardware implemented on the 68060 are encountered. The
+isp.sa provides full emulation support for these instructions.
+
+The unimplemented integer instructions are:
+	64-bit divide
+	64-bit multiply
+	movep
+	cmp2
+	chk2
+	cas (w/ a misaligned effective address)
+	cas2
+
+Release file format:
+--------------------
+The file isp.sa is essentially a hexadecimal image of the
+release package. This is the ONLY format which will be supported.
+The hex image was created by assembling the source code and
+then converting the resulting binary output image into an
+ASCII text file. The hexadecimal numbers are listed
+using the Motorola Assembly Syntax assembler directive "dc.l"
+(define constant longword). The file can be converted to other
+assembly syntaxes by using any word processor with a global
+search and replace function.
+
+To assist in assembling and linking this module with other modules,
+the installer should add a symbolic label to the top of the file.
+This will allow calling routines to access the entry points
+of this package.
+
+The source code isp.s has also been included but only for
+documentation purposes.
+
+Release file structure:
+-----------------------
+
+(top of module)
+	-----------------
+	|		| - 128 byte-sized section
+   (1)  |   Call-Out    | - 4 bytes per entry (user fills these in)
+	|		| - example routines in iskeleton.s
+	-----------------
+	|		| - 8 bytes per entry
+   (2)  | Entry Point   | - user does a "bra" or "jmp" to this address
+	|               | 
+	-----------------
+	|		| - code section
+   (3)  ~		~
+	|		|
+	-----------------
+(bottom of module)
+
+The first section of this module is the "Call-out" section. This section
+is NOT INCLUDED in isp.sa (an example "Call-out" section is provided at
+the end of the file iskeleton.s). The purpose of this section is to allow 
+the ISP routines to reference external functions that must be provided 
+by the host operating system. This section MUST be exactly 128 bytes in 
+size. There are 32 fields, each 4 bytes in size. Each field corresponds
+to a function required by the ISP (these functions and their location are
+listed in "68060ISP call-outs" below). Each field entry should contain
+the address of the corresponding function RELATIVE to the starting address
+of the "call-out" section. The "Call-out" section must sit adjacent to the 
+isp.sa image in memory.
+
+The second section, the "Entry-point" section, is used by external routines
+to access the functions within the ISP. Since the isp.sa hex file contains
+no symbol names, this section contains function entry points that are fixed
+with respect to the top of the package. The currently defined entry-points
+are listed in section "68060 ISP entry points" below. A calling routine
+would simply execute a "bra" or "jmp" that jumped to the selected function
+entry-point.
+
+For example, if the 68060 hardware took a "Unimplemented Integer Instruction"
+exception (vector #61), the operating system should execute something
+similar to:
+
+	bra	_060ISP_TOP+128+0
+
+(_060ISP_TOP is the starting address of the "Call-out" section; the "Call-out"
+section is 128 bytes long; and the Unimplemented Integer ISP handler entry 
+point is located 0 bytes from the top of the "Entry-point" section.)
+
+The third section is the code section. After entering through an "Entry-point",
+the entry code jumps to the appropriate emulation code within the code section.
+
+68060ISP call-outs: (details in iskeleton.s)
+--------------------
+0x000:	_060_real_chk
+0x004:	_060_real_divbyzero
+0x008:	_060_real_trace
+0x00c:	_060_real_access
+0x010:	_060_isp_done
+
+0x014:	_060_real_cas
+0x018:	_060_real_cas2
+0x01c:	_060_real_lock_page
+0x020:	_060_real_unlock_page
+
+0x024:	(Motorola reserved)
+0x028:	(Motorola reserved)
+0x02c:	(Motorola reserved)
+0x030:	(Motorola reserved)
+0x034:	(Motorola reserved)
+0x038:	(Motorola reserved)
+0x03c:	(Motorola reserved)
+
+0x040:	_060_imem_read
+0x044:	_060_dmem_read
+0x048:	_060_dmem_write
+0x04c:	_060_imem_read_word
+0x050:	_060_imem_read_long
+0x054:	_060_dmem_read_byte
+0x058:	_060_dmem_read_word
+0x05c:	_060_dmem_read_long
+0x060:	_060_dmem_write_byte
+0x064:	_060_dmem_write_word
+0x068:	_060_dmem_write_long
+
+0x06c:	(Motorola reserved)
+0x070:	(Motorola reserved)
+0x074:	(Motorola reserved)
+0x078:	(Motorola reserved)
+0x07c:	(Motorola reserved)
+
+68060ISP entry points:
+-----------------------
+0x000:	_060_isp_unimp
+
+0x008:	_060_isp_cas
+0x010:	_060_isp_cas2
+0x018:	_060_isp_cas_finish
+0x020:	_060_isp_cas2_finish
+0x028:	_060_isp_cas_inrange
+0x030:	_060_isp_cas_terminate
+0x038:	_060_isp_cas_restart
+
+Integrating cas/cas2:
+---------------------
+The instructions "cas2" and "cas" (when used with a misaligned effective
+address) take the Unimplemented Integer Instruction exception. When the
+060ISP is installed properly, these instructions will enter through the
+_060_isp_unimp() entry point of the ISP.
+
+After the 060ISP decodes the instruction type and fetches the appropriate
+data registers, and BEFORE the actual emulated transfers occur, the 
+package calls either the "Call-out" _060_real_cas() or _060_real_cas2().
+If the emulation code provided by the 060ISP is sufficient for the
+host system (see isp.s source code), then these "Call-out"s should be
+made, by the system integrator, to point directly back into the package
+through the "Entry-point"s _060_isp_cas() or _060_isp_cas2().
+
+One other necessary action by the integrator is to supply the routines
+_060_real_lock_page() and _060_real_unlock_page(). These functions are
+defined further in iskeleton.s and the 68060 Software Package Specification.
+
+If the "core" emulation routines of either "cas" or "cas2" perform some
+actions which are too system-specific, then the system integrator must
+supply new emulation code. This new emulation code should reside within
+the functions _060_real_cas() or _060_real_cas2(). When this new emulation
+code has completed, then it should re-enter the 060ISP package through the
+"Entry-point" _060_isp_cas_finish() or _060_isp_cas2_finish().
+To see what the register state is upon entering _060_real_cas() or
+_060_real_cas2() and what it should be upon return to the package through
+_060_isp_cas_finish() or _060_isp_cas2_finish(), please refer to the
+source code in isp.s.
+
+Miscellaneous:
+--------------
+
+_060_isp_unimp:
+----------------
+- documented in 2.2 in spec.
+- Basic flow:
+	exception taken ---> enter _060_isp_unimp   --|
+						      |
+						      |
+            may exit through _060_real_itrace    <----|
+						  or  |
+            may exit through _060_real_chk       <----|
+						  or  |
+            may exit through _060_real_divbyzero <----|
+						  or  |
+            may exit through _060_isp_done       <----|