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Rev Age Author Path Log message Diff
2467 6168 d 20 h jermar /trunk/ Improve comments for arch-specific implementations of hierarchical
4-level page tables. Improve formatting.		  
2222 6234 d 17 h decky /trunk/kernel/ map kernel pages explicitly as writable (this solves compatibility issues with Intel Core 2)
make VESA framebuffer initialization more robust		  
2183 6237 d 22 h jermar /trunk/kernel/generic/ Continue to de-oversynchronize the kernel.
- replace as->refcount with an atomic counter; accesses to this
reference counter are not to be done when the as->lock mutex is held;
this gets us rid of mutex_lock_active();

Remove the possibility of a deadlock between TLB shootdown and asidlock.
- get rid of mutex_lock_active() on as->lock
- when locking the asidlock spinlock, always do it conditionally and with
preemption disabled; in the unsuccessful case, enable interrupts and try again
- there should be no deadlock between TLB shootdown and the as->lock mutexes
- PLEASE REVIEW !!!

Add DEADLOCK_PROBE's to places where we have spinlock_trylock() loops.		  
2170 6242 d 16 h jermar /trunk/kernel/ Simplify synchronization in as_switch().
The function was oversynchronized, which
was causing deadlocks on the address
space mutex.

Now, address spaces can only be switched
when the asidlock is held. This also protects
stealing of ASIDs. No other synchronization
is necessary.		  
2141 6246 d 15 h jermar /trunk/ The Ultimate Solution To Illegal Virtual Aliases.
It is better to avoid them completely than to fight them.
Switch the sparc64 port to 16K pages. The TLBs and TSBs
continue to operate with 8K pages only. Page tables and
other generic parts operate with 16K pages.

Because the MMU doesn't support 16K directly, each 16K
page is emulated by a pair of 8K pages. With 16K pages,
illegal aliases cannot be created in 16K D-cache.		  
2134 6247 d 19 h jermar /trunk/kernel/ Reworked handling of illegal virtual aliases caused by frame reuse.
We moved the incomplete handling from backend's frame method to
backend's page_fault method. The page_fault method is the one that
can create an illegal alias if it writes the userspace frame using
kernel address with a different page color than the page to which is
this frame mapped in userspace. When we detect this, we do D-cache
shootdown on all processors (!!!).

If we add code that accesses userspace memory from kernel address
space, we will have to check for illegal virtual aliases at all such
places.

I tested this on a 4-way simulated E6500 and a real-world Ultra 5,
which has unfortunatelly only one processor.

This solves ticket #26.		  
2133 6247 d 19 h jermar /trunk/kernel/generic/src/mm/ Coding style and indentation fixes.  
2132 6249 d 1 h jermar /trunk/kernel/generic/src/mm/ Fix coding style in the address space area backends.  
2128 6289 d 19 h jermar /trunk/ Add arm32 architecture. The 32 suffix is used to specify that 16-bit Thumb
instructions are not used. The arm32 code is mostly composed of placeholders
that need to be replaced by real implementation. So far, the arm32 tree
only compiles. If run under GXEmul simulator, an infinit loop at the
kernel entry point will be entered.		  
2126 6290 d 15 h decky /trunk/kernel/ small cleanup, more work coming  
2125 6290 d 18 h decky /trunk/ experimental support for Objective C
(disabled by default)		  
2124 6290 d 20 h decky /trunk/kernel/generic/ implement simple realloc()  
2123 6296 d 23 h decky /trunk/kernel/generic/src/mm/ add forgotten unsigned  
2122 6296 d 23 h decky /trunk/kernel/generic/ explicit typecast, fix signed/unsigned comparison  
2121 6296 d 23 h decky /trunk/kernel/generic/src/mm/ remove anonymous structure, add static qualifier  
2106 6299 d 1 h jermar /trunk/kernel/ Merge as_t structure into one and leave the differring parts in as_genarch_t.

Indentation and formatting changes in header files.		  
2094 6303 d 21 h decky /trunk/kernel/generic/ avoid conflict with potential keyword  
2089 6305 d 1 h decky /trunk/ huge type system cleanup
remove cyclical type dependencies across multiple header files
many minor coding style fixes		  
2087 6305 d 21 h jermar /trunk/kernel/ Indentaion and formatting changes even Martin will like :-)  
2083 6311 d 1 h decky /trunk/kernel/ typedef elimination  
2076 6314 d 2 h jermar /trunk/kernel/ Beat the implicit illegal virtual alias created by reusing userspace frames.
In the anonymous and ELF backends, if the architecture has virtually indexed D-cache,
selectively flush cachelines belonging to the frame being freed.
This fixes Ticket #20.		  
2071 6315 d 18 h jermar /trunk/ (c) versus (C)  
2069 6317 d 16 h jermar /trunk/ Improve formatting.  
2059 6339 d 3 h jermar /trunk/kernel/generic/ Improve indentation and formatting.  
2052 6344 d 21 h decky /trunk/kernel/generic/src/mm/ pretty-print slabs  
2048 6347 d 19 h jermar /trunk/ Formatting and indentation changes.  
2035 6350 d 23 h decky /trunk/kernel/generic/src/ more fancy kconsole output  
2015 6354 d 18 h jermar /trunk/ Rework support for virtually indexed cache.
Instead of repeatedly flushing the data cache, which was a huge overkill, refuse to create an illegal address alias
in the kernel (again) and allocate appropriate page color in userspace instead. Extend the detection also to
SYS_PHYSMEM_MAP syscall.

Add support for tracking physical memory areas mappable by SYS_PHYSMEM_MAP.

Lots of coding style changes.		  
2009 6359 d 17 h jermar /trunk/kernel/ Initial support for handling illegal virtual aliases on sparc64.  
2007 6362 d 16 h jermar /trunk/kernel/ Introduce page colors. So far, only sparc64 uses correct page color bits. Other architectures have a dummy define
specifying zero bits for a page color.

There is a new check of page color in as_area_share(). Because of lack of support for this in the userspace, the
check has been #ifef'ed out.		  
2000 6366 d 3 h decky /trunk/kernel/ move files to more proper locations  
1999 6366 d 3 h decky /trunk/ start RAM disk support  
1981 6376 d 2 h jermar /trunk/kernel/ Indentation, formatting and minor changes.  
1954 6398 d 17 h jermar /trunk/ Minor changes. Some coding style fixes and also a type (tee vs. tree).
One AS -> as change.		  
1950 6402 d 21 h jermar /trunk/kernel/ Indentation changes and coding style fixes in slab.c and slab.h.  
1915 6416 d 18 h jermar /trunk/kernel/ A quote from from SPARC V9 specification:

The Y register is deprecated; it is provided only for compatibility with previous versions
of the architecture. It should not be used in new SPARC-V9 software. It is
recommended that all instructions that reference the Y register (i.e., SMUL,
SMULcc, UMUL, UMULcc, MULScc, SDIV, SDIVcc, UDIV, UDIVcc, RDY, and
WRY) be avoided. See the appropriate pages in Appendix A, “Instruction Definitions,”
for suitable substitute instructions.

Still gcc is generating code which uses Y and some of the instructions above.
This change modifies the preemptible_handler() to preserve the Y register
across preemption.		  
1914 6416 d 23 h jermar /trunk/kernel/generic/ Add function for printing out info about address space.  
1904 6426 d 22 h jermar /trunk/kernel/ IPI/cross-call support for sparc64.
SMP on sparc64 is now fully supported.		  
1894 6435 d 16 h jermar /trunk/ Add balloc() (a.k.a boot allocator):
- balloc() only needs to know how to allocate memory.
- Memory allocated via balloc() is supposed to be passed to kernel and never freed by boot itself.
- make kernel aware of boot allocations

More work on OFW device tree:
- use balloc() to efficiently and safely allocate memory for the canonical copy of the device tree

sparc64 boot:
- pass OFW device tree root node pointer to kernel		  
1891 6436 d 16 h jermar /trunk/kernel/ sparc64 work:
- Experimental support for TSB (Translation Storage Buffer).