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[Michael Schmitt] Attached is a patch to SheepShaver to fix memory allocation problems when OS X 10.5 is the host. It also relaxes the 512 MB RAM limit on OS X hosts. Problem ------- Some users have been unable to run SheepShaver on OS X 10.5 (Leopard) hosts. The symptom is error "ERROR: Cannot map RAM: File already exists". SheepShaver allocates RAM at fixed addresses. If it is running in "Real" addressing mode, and can't allocate at address 0, then it was hard-coded to allocate the RAM area at 0x20000000. The ROM area as allocated at 0x40800000. The normal configuration is for SheepShaver to run under SDL, which is a Cocoa wrapper. By the time SheepShaver does its memory allocations, the Cocoa application has already started. The result is the SheepShaver memory address space already contains libraries, fonts, Input Managers, and IOKit areas. On Leopard hosts these areas can land on the same addresses SheepShaver needs, so SheepShaver's memory allocation fails. Solution -------- The approach is to change SheepShaver (on Unix & OS X hosts) to allocate the RAM area anywhere it can find the space, rather than at a fixed address. This could result in the RAM allocated higher than the ROM area, which causes a crash. To prevent this from occurring, the RAM and ROM areas are allocated contiguously. Previously the ROM starting address was a constant ROM_BASE, which was used throughout the source files. The ROM start address is now a variable ROMBase. ROMBase is allocated and set by main_*.cpp just like RAMBase. A side-effect of this change is that it lifts the 512 MB RAM limit for OS X hosts. The limit was because the fixed RAM and ROM addresses were such that the RAM could only be 512 MB before it overlapped the ROM area. Impact ------ The change to make ROMBase a variable is throughout all hosts & addressing modes. The RAM and ROM areas will only shift when run on Unix & OS X hosts, otherwise the same fixed allocation address is used as before. This change is limited to "Real" addressing mode. Unlike Basilisk II, SheepShaver *pre-calculates* the offset for "Direct" addressing mode; the offset is compiled into the program. If the RAM address were allowed to shift, it could result in the RAM area wrapping around address 0. Changes to main_unix.cpp ------------------------ 1. Real addressing mode no longer defines a RAM_BASE constant. 2. The base address of the Mac ROM (ROMBase) is defined and exported by this program. 3. Memory management helper vm_mac_acquire is renamed to vm_mac_acquire_fixed. Added a new memory management helper vm_mac_acquire, which allocates memory at any address. 4. Changed and rearranged the allocation of RAM and ROM areas. Before it worked like this: - Allocate ROM area - If can, attempt to allocate RAM at address zero - If RAM not allocated at 0, allocate at fixed address We still want to try allocating the RAM at zero, and if using DIRECT addressing we're still going to use the fixed addresses. So we don't know where the ROM should be until after we do the RAM. The new logic is: - If can, attempt to allocate RAM at address zero - If RAM not allocated at 0 if REAL addressing allocate RAM and ROM together. The ROM address is aligned to a 1 MB boundary else (direct addressing) allocate RAM at fixed address - If ROM hasn't been allocated yet, allocate at fixed address 5. Calculate ROMBase and ROMBaseHost based on where the ROM was loaded. 6. There is a crash if the RAM is allocated too high. To try and catch this, check if it was allocated higher than the kernel data address. 7. Change subsequent code from using constant ROM_BASE to variable ROMBase. Changes to Other Programs ------------------------- emul_op.cpp, main.cpp, name_registery.cpp, rom_patches.cpp, rsrc_patches.cpp, emul_ppc.cpp, sheepshaver_glue.cpp, ppc-translate-cpp: Change from constant ROM_BASE to variable ROMBase. ppc_asm.S: It was setting register to a hard-coded literal address: 0x40b0d000. Changed to set it to ROMBase + 0x30d000. ppc_asm.tmpl: It defined a macro ASM_LO16 but it assumed that the macro would always be used with operands that included a register specification. This is not true. Moved the register specification from the macro to the macro invocations. main_beos.cpp, main_windows.cpp: Since the subprograms are all expecting a variable ROMBase, all the main_*.cpp pgrams have to define and export it. The ROM_BASE constant is moved here for consistency. The mains for beos and windows just allocate the ROM at the same fixed address as before, set ROMBaseHost and ROMBase to that address, and then use ROMBase for the subsequent code. cpu_emulation.h: removed ROM_BASE constant. This value is moved to the main_*.cpp modules, to be consistent with RAM_BASE. user_strings_unix.cpp, user_strings_unix.h: Added new error messages related to errors that occur when the RAM and ROM are allocated anywhere.
Happy New Year!
Fix Master of Orion II
Don't read from 0xf8000090 during MacOS (8.5, 9.0) installation. Is this an OpenFirmware check for OldWorld 604-based machines? XXX I have code pending that makes it possible to use PowerMac ID #3035 and model 510 (PowerMac G3 Series). However, I have a regression with one of my MacOS 8.6 disks. This is non-standard anyway since it was installed from the iMac DV 8.6 discs ("yellow" not generic) with MOL -- SheepShaver can't cope with it. So I am not surprised it breaks. Otherwise, 8.5 -> 9.0.4 were fine with it. BTW, the "regression" is Native Resource Manager is not installed and the boot gets mad later. FWIW, it's the same as for MacOS 9.1. A resource is very likely not loaded.
Add 'nsrd' 1 and 'gpch' 650 patches for MacOS 7.5.3 Revision 2.2
Review MacOS 8.6 vs 9.0 patches: - 'boot' 3: set boot stack pointer only once at the correct place - 'gpch' 750: fix FE0A opcode replacement (selector #$0a is virt2phys on pgidx) - 'gpch' 750: remove bogus patch for SonyVars - Mark patches "9.0" verified accordingly vs. 8.6
Don't access ROM85 as it it was a pointer to a ROM version number (8.0, 8.1) aka. fix bogus AppleShare extension, it was trying to dereference 0x3fff. XXX: why is this code called in the first place?
Add patches for native GetNamedResource() and Get1NamedResource(). This will be useful to fix a bug in the AppleShare extension (see DRVR .AFPTranslator in Basilisk II) Unrelated improvement: call sheepshaver_cpu::get_resource() directly, don't get it through another global function.
Issue a SysError(dsOldSystem) if we are trying to use MacOS < 8.1.0 with a NewWorld ROM. That may be 8.1.0 included but original iMac had a NewWorld ROM compatible system. Otherwise we will crash because the boot routine is trying to execute code through unitialized descriptor that points to 0x13ff, which is obviously wrong (and unaligned on word-boundaries for 68k code).
Happy New Year 2005!
workaround direct access to FCBS from Apple Personal Diagnostics in MacOS 9
Don't overwrite our serial drivers (9.0)
Implement Direct Addressing mode similarly to Basilisk II. This is to get SheepShaver working on OSes that don't support maipping of Low Memory globals at 0x00000000, e.g. Windows.
MacOS 9.0.4 support. ;-)
Don't access VIA variables in NObj resource ID 100. aka. enable MacBench 5.0 to run.
Happy New Year! :)
Add new thunking system for 64-bit fixes.
little endian fixes
More little endian fixes
first round of little endian fixes
- Integrate new NativeOp instructions to be used as trampolines to call native functions from ppc code. - Little endian fixes in emul_op.cpp - Add new 'gpch' 750 patch to workaround crash with MacOS 8.6 - Don't crash in Process Manager on reset/shutdown with MacOS 8.6 - We also have an experimental interrupt thread in emulation mode
Make EmulOp() and check_load_invoc() extern "C" so that we are C++ name mangling independent for asm_linux.S
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