diff options
Diffstat (limited to 'kernel/arch/m68k/ifpsp060/isp.doc')
| -rw-r--r-- | kernel/arch/m68k/ifpsp060/isp.doc | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/kernel/arch/m68k/ifpsp060/isp.doc b/kernel/arch/m68k/ifpsp060/isp.doc new file mode 100644 index 000000000..9dadd727f --- /dev/null +++ b/kernel/arch/m68k/ifpsp060/isp.doc @@ -0,0 +1,218 @@ +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +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 <----| |