| 54 |
|
functions (do_get_mem_long() etc.) that translate addresses. This slows |
| 55 |
|
down the emulator, of course. |
| 56 |
|
|
| 57 |
< |
2. Emulated CPU, "real" addressing (EMULATED_68K = 1, REAL_ADDRESSING = 0): |
| 57 |
> |
2. Emulated CPU, "real" addressing (EMULATED_68K = 1, REAL_ADDRESSING = 1): |
| 58 |
|
This mode is intended for big-endian non-68k systems that do allow access to |
| 59 |
|
RAM at 0x0000..0x1fff. As in the virtual addressing mode, the 68k processor |
| 60 |
|
is emulated with the UAE CPU engine and two areas are set up for RAM and ROM |
| 105 |
|
priviledged instructions, mostly for interrupt control). So either |
| 106 |
|
the whole emulator has to be run in supervisor mode (which usually is |
| 107 |
|
not possible on multitasking systems) or priviledged instructions have |
| 108 |
< |
to be trapped and emulated. The Amiga version of Basilisk II uses the |
| 109 |
< |
latter approach (it is possible to run supervisor mode tasks under |
| 110 |
< |
the AmigaOS multitasking kernel (ShapeShifter does this) but it |
| 111 |
< |
requires modifying the task switcher and makes the emulator more |
| 112 |
< |
unstable). |
| 108 |
> |
to be trapped and emulated. The Amiga and NetBSD/m68k versions of |
| 109 |
> |
Basilisk II use the latter approach (it is possible to run supervisor |
| 110 |
> |
mode tasks under the AmigaOS multitasking kernel (ShapeShifter does |
| 111 |
> |
this) but it requires modifying the Exec task switcher and makes the |
| 112 |
> |
emulator more unstable). |
| 113 |
|
c) On multitasking systems, interrupts can usually not be handled as on |
| 114 |
|
a real Mac (or with the UAE CPU). The interrupt levels of the host |
| 115 |
|
will not be the same as on a Mac, and the operating systems might not |
| 239 |
|
- floppy driver ("sony.cpp") |
| 240 |
|
- disk driver ("disk.cpp") |
| 241 |
|
- CD-ROM driver ("cdrom.cpp") |
| 242 |
+ |
- external file system ("extfs.cpp") |
| 243 |
|
- serial drivers ("serial.cpp") |
| 244 |
|
- Ethernet driver ("ether.cpp") |
| 245 |
|
- system-dependant device access ("sys_*.cpp") |
| 381 |
|
Mac models was custom-built for Apple by Sony (this was one of the first |
| 382 |
|
applications of the 3.5" floppy format which was also invented by Sony). |
| 383 |
|
|
| 384 |
< |
6.10. Serial drivers |
| 384 |
> |
6.10. External file system |
| 385 |
> |
-------------------------- |
| 386 |
> |
|
| 387 |
> |
Basilisk II also provides a method for accessing files and direcories on the |
| 388 |
> |
host OS from the MacOS side by means of an "external" file system (henceforth |
| 389 |
> |
called "ExtFS"). The ExtFS is built upon the File System Manager 1.2 interface |
| 390 |
> |
that is built into MacOS 7.6 (and later) and available as a system extension |
| 391 |
> |
for earlier MacOS versions. Unlike other parts of Basilisk II, extfs.cpp |
| 392 |
> |
requires POSIX file I/O and this is not going to change any time soon, so if |
| 393 |
> |
you are porting Basilisk II to a system without POSIX file functions, you |
| 394 |
> |
should emulate them. |
| 395 |
> |
|
| 396 |
> |
6.11. Serial drivers |
| 397 |
|
-------------------- |
| 398 |
|
|
| 399 |
|
Similar to the disk drivers, Basilisk II contains replacement serial drivers |
| 417 |
|
MacOS when it returns to interrupt level 0. This mechanism sounds complicated |
| 418 |
|
but is necessary to ensure stable operation of the serial driver. |
| 419 |
|
|
| 420 |
< |
6.11. Ethernet driver |
| 420 |
> |
6.12. Ethernet driver |
| 421 |
|
--------------------- |
| 422 |
|
|
| 423 |
|
A driver for Ethernet networking is also contained in the NuBus slot ROM. |
| 487 |
|
|
| 488 |
|
For a more detailed description of the Ethernet driver, see "Inside AppleTalk". |
| 489 |
|
|
| 490 |
< |
6.12. System-dependant device access |
| 490 |
> |
6.13. System-dependant device access |
| 491 |
|
------------------------------------ |
| 492 |
|
|
| 493 |
|
The method for accessing floppy drives, hard disks, CD-ROM drives and files |
| 496 |
|
implemented by the (system-dependant) "sys_*.cpp" modules which provides a |
| 497 |
|
standard, Unix-like interface to all kinds of devices. |
| 498 |
|
|
| 499 |
< |
6.13. User interface strings |
| 499 |
> |
6.14. User interface strings |
| 500 |
|
---------------------------- |
| 501 |
|
|
| 502 |
|
To aid in localization, all user interface strings of Basilisk II are collected |
| 503 |
< |
in "user_strings.cpp" and accessed via the GetString() function. This way, |
| 504 |
< |
Basilisk II may be easily translated to different languages. |
| 503 |
> |
in "user_strings.cpp" (for common strings) and "user_strings_*.cpp" (for |
| 504 |
> |
platform-specific strings), and accessed via the GetString() function. This |
| 505 |
> |
way, Basilisk II may be easily translated to different languages. |
| 506 |
|
|
| 507 |
< |
6.14. Preferences management |
| 507 |
> |
6.15. Preferences management |
| 508 |
|
---------------------------- |
| 509 |
|
|
| 510 |
|
The module "prefs.cpp" handles user preferences in a system-independant way. |
