219 lines
8.4 KiB
Text
219 lines
8.4 KiB
Text
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
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M68000 Hi-Performance Microprocessor Division
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M68060 Software Package
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Production Release P1.00 -- October 10, 1994
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M68060 Software Package Copyright <20> 1993, 1994 Motorola Inc. All rights reserved.
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THE SOFTWARE is provided on an "AS IS" basis and without warranty.
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To the maximum extent permitted by applicable law,
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MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
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INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
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and any warranty against infringement with regard to the SOFTWARE
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(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
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To the maximum extent permitted by applicable law,
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IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
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(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
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BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
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ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
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Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
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You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
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so long as this entire notice is retained without alteration in any modified and/or
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redistributed versions, and that such modified versions are clearly identified as such.
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No licenses are granted by implication, estoppel or otherwise under any patents
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or trademarks of Motorola, Inc.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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68060 INTEGER SOFTWARE PACKAGE (Kernel version)
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------------------------------------------------
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The file isp.sa contains the 68060 Integer Software Package.
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This package is essentially an exception handler that can be
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integrated into an operating system to handle the "Unimplemented
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Integer Instruction" exception vector #61.
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This exception is taken when any of the integer instructions
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not hardware implemented on the 68060 are encountered. The
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isp.sa provides full emulation support for these instructions.
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The unimplemented integer instructions are:
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64-bit divide
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64-bit multiply
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movep
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cmp2
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chk2
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cas (w/ a misaligned effective address)
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cas2
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Release file format:
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--------------------
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The file isp.sa is essentially a hexadecimal image of the
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release package. This is the ONLY format which will be supported.
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The hex image was created by assembling the source code and
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then converting the resulting binary output image into an
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ASCII text file. The hexadecimal numbers are listed
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using the Motorola Assembly Syntax assembler directive "dc.l"
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(define constant longword). The file can be converted to other
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assembly syntaxes by using any word processor with a global
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search and replace function.
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To assist in assembling and linking this module with other modules,
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the installer should add a symbolic label to the top of the file.
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This will allow calling routines to access the entry points
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of this package.
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The source code isp.s has also been included but only for
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documentation purposes.
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Release file structure:
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-----------------------
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(top of module)
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-----------------
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| | - 128 byte-sized section
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(1) | Call-Out | - 4 bytes per entry (user fills these in)
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| | - example routines in iskeleton.s
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-----------------
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| | - 8 bytes per entry
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(2) | Entry Point | - user does a "bra" or "jmp" to this address
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-----------------
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| | - code section
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(3) ~ ~
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-----------------
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(bottom of module)
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The first section of this module is the "Call-out" section. This section
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is NOT INCLUDED in isp.sa (an example "Call-out" section is provided at
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the end of the file iskeleton.s). The purpose of this section is to allow
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the ISP routines to reference external functions that must be provided
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by the host operating system. This section MUST be exactly 128 bytes in
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size. There are 32 fields, each 4 bytes in size. Each field corresponds
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to a function required by the ISP (these functions and their location are
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listed in "68060ISP call-outs" below). Each field entry should contain
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the address of the corresponding function RELATIVE to the starting address
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of the "call-out" section. The "Call-out" section must sit adjacent to the
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isp.sa image in memory.
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The second section, the "Entry-point" section, is used by external routines
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to access the functions within the ISP. Since the isp.sa hex file contains
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no symbol names, this section contains function entry points that are fixed
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with respect to the top of the package. The currently defined entry-points
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are listed in section "68060 ISP entry points" below. A calling routine
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would simply execute a "bra" or "jmp" that jumped to the selected function
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entry-point.
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For example, if the 68060 hardware took a "Unimplemented Integer Instruction"
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exception (vector #61), the operating system should execute something
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similar to:
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bra _060ISP_TOP+128+0
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(_060ISP_TOP is the starting address of the "Call-out" section; the "Call-out"
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section is 128 bytes long; and the Unimplemented Integer ISP handler entry
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point is located 0 bytes from the top of the "Entry-point" section.)
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The third section is the code section. After entering through an "Entry-point",
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the entry code jumps to the appropriate emulation code within the code section.
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68060ISP call-outs: (details in iskeleton.s)
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--------------------
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0x000: _060_real_chk
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0x004: _060_real_divbyzero
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0x008: _060_real_trace
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0x00c: _060_real_access
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0x010: _060_isp_done
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0x014: _060_real_cas
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0x018: _060_real_cas2
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0x01c: _060_real_lock_page
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0x020: _060_real_unlock_page
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0x024: (Motorola reserved)
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0x028: (Motorola reserved)
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0x02c: (Motorola reserved)
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0x030: (Motorola reserved)
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0x034: (Motorola reserved)
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0x038: (Motorola reserved)
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0x03c: (Motorola reserved)
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0x040: _060_imem_read
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0x044: _060_dmem_read
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0x048: _060_dmem_write
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0x04c: _060_imem_read_word
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0x050: _060_imem_read_long
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0x054: _060_dmem_read_byte
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0x058: _060_dmem_read_word
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0x05c: _060_dmem_read_long
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0x060: _060_dmem_write_byte
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0x064: _060_dmem_write_word
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0x068: _060_dmem_write_long
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0x06c: (Motorola reserved)
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0x070: (Motorola reserved)
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0x074: (Motorola reserved)
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0x078: (Motorola reserved)
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0x07c: (Motorola reserved)
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68060ISP entry points:
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-----------------------
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0x000: _060_isp_unimp
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0x008: _060_isp_cas
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0x010: _060_isp_cas2
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0x018: _060_isp_cas_finish
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0x020: _060_isp_cas2_finish
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0x028: _060_isp_cas_inrange
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0x030: _060_isp_cas_terminate
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0x038: _060_isp_cas_restart
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Integrating cas/cas2:
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---------------------
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The instructions "cas2" and "cas" (when used with a misaligned effective
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address) take the Unimplemented Integer Instruction exception. When the
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060ISP is installed properly, these instructions will enter through the
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_060_isp_unimp() entry point of the ISP.
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After the 060ISP decodes the instruction type and fetches the appropriate
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data registers, and BEFORE the actual emulated transfers occur, the
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package calls either the "Call-out" _060_real_cas() or _060_real_cas2().
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If the emulation code provided by the 060ISP is sufficient for the
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host system (see isp.s source code), then these "Call-out"s should be
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made, by the system integrator, to point directly back into the package
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through the "Entry-point"s _060_isp_cas() or _060_isp_cas2().
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One other necessary action by the integrator is to supply the routines
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_060_real_lock_page() and _060_real_unlock_page(). These functions are
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defined further in iskeleton.s and the 68060 Software Package Specification.
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If the "core" emulation routines of either "cas" or "cas2" perform some
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actions which are too system-specific, then the system integrator must
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supply new emulation code. This new emulation code should reside within
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the functions _060_real_cas() or _060_real_cas2(). When this new emulation
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code has completed, then it should re-enter the 060ISP package through the
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"Entry-point" _060_isp_cas_finish() or _060_isp_cas2_finish().
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To see what the register state is upon entering _060_real_cas() or
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_060_real_cas2() and what it should be upon return to the package through
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_060_isp_cas_finish() or _060_isp_cas2_finish(), please refer to the
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source code in isp.s.
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Miscellaneous:
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--------------
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_060_isp_unimp:
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----------------
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- documented in 2.2 in spec.
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- Basic flow:
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exception taken ---> enter _060_isp_unimp --|
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may exit through _060_real_itrace <----|
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or |
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may exit through _060_real_chk <----|
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or |
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may exit through _060_real_divbyzero <----|
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or |
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may exit through _060_isp_done <----|
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