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  1. 25 Sep, 2005 2 commits
    • David S. Miller's avatar
      [SPARC64]: Add CONFIG_DEBUG_PAGEALLOC support. · 56425306
      David S. Miller authored 
      The trick is that we do the kernel linear mapping TLB miss starting
with an instruction sequence like this:

	ba,pt		%xcc, kvmap_load
	 xor		%g2, %g4, %g5

succeeded by an instruction sequence which performs a full page table
walk starting at swapper_pg_dir.

We first take over the trap table from the firmware.  Then, using this
constant PTE generation for the linear mapping area above, we build
the kernel page tables for the linear mapping.

After this is setup, we patch that branch above into a "nop", which
will cause TLB misses to fall through to the full page table walk.

With this, the page unmapping for CONFIG_DEBUG_PAGEALLOC is trivial.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      56425306
    • David S. Miller's avatar
      [SPARC64]: Fix mask formation in tomatillo_wsync_handler() · 52f26deb
      David S. Miller authored 
      "1" needs to be "1UL", this is a 64-bit mask we're creating.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      52f26deb
  3. 23 Sep, 2005 4 commits
    • David S. Miller's avatar
      [SPARC64]: Mark functions called by paging_init() as __init. · 898cf0ec
      David S. Miller authored 
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      898cf0ec
    • David S. Miller's avatar
      [SPARC64]: Kill unused variable in setup_arch() · 1c9ea5db
      David S. Miller authored 
      'highest_paddr' is set, but never actually used.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1c9ea5db
    • David S. Miller's avatar
      [SPARC64]: Fix comment typo in head.S · a8201c61
      David S. Miller authored 
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a8201c61
    • David S. Miller's avatar
      [SPARC64]: Rewrite bootup sequence. · bff06d55
      David S. Miller authored 
      Instead of all of this cpu-specific code to remap the kernel
to the correct location, use portable firmware calls to do
this instead.

What we do now is the following in position independant
assembler:

	chosen_node = prom_finddevice("/chosen");
	prom_mmu_ihandle_cache = prom_getint(chosen_node, "mmu");
	vaddr = 4MB_ALIGN(current_text_addr());
	prom_translate(vaddr, &paddr_high, &paddr_low, &mode);
	prom_boot_mapping_mode = mode;
	prom_boot_mapping_phys_high = paddr_high;
	prom_boot_mapping_phys_low = paddr_low;
	prom_map(-1, 8 * 1024 * 1024, KERNBASE, paddr_low);

and that replaces the massive amount of by-hand TLB probing and
programming we used to do here.

The new code should also handle properly the case where the kernel
is mapped at the correct address already (think: future kexec
support).

Consequently, the bulk of remap_kernel() dies as does the entirety
of arch/sparc64/prom/map.S

We try to share some strings in the PROM library with the ones used
at bootup, and while we're here mark input strings to oplib.h routines
with "const" when appropriate.

There are many more simplifications now possible.  For one thing, we
can consolidate the two copies we now have of a lot of cpu setup code
sitting in head.S and trampoline.S.

This is a significant step towards CONFIG_DEBUG_PAGEALLOC support.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bff06d55
  5. 22 Sep, 2005 8 commits
  7. 21 Sep, 2005 26 commits