| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 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 <----| |
