kernel_optimize_test/arch/sparc
David S. Miller b2d4383480 sparc64: Make PAGE_OFFSET variable.
Choose PAGE_OFFSET dynamically based upon cpu type.

Original UltraSPARC-I (spitfire) chips only supported a 44-bit
virtual address space.

Newer chips (T4 and later) support 52-bit virtual addresses
and up to 47-bits of physical memory space.

Therefore we have to adjust PAGE_SIZE dynamically based upon
the capabilities of the chip.

Note that this change alone does not allow us to support > 43-bit
physical memory, to do that we need to re-arrange our page table
support.  The current encodings of the pmd_t and pgd_t pointers
restricts us to "32 + 11" == 43 bits.

This change can waste quite a bit of memory for the various tables.
In particular, a future change should work to size and allocate
kern_linear_bitmap[] and sparc64_valid_addr_bitmap[] dynamically.
This isn't easy as we really cannot take a TLB miss when accessing
kern_linear_bitmap[].  We'd have to lock it into the TLB or similar.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Bob Picco <bob.picco@oracle.com>
2013-11-12 15:22:34 -08:00
..
boot sparc: Fix piggyback with newer binutils. 2012-12-03 11:24:25 -08:00
configs perf: Remove PERF_COUNTERS config option 2012-04-26 13:52:52 +02:00
crypto sparc64: Set CRYPTO_TFM_REQ_MAY_SLEEP consistently in CAMELLIA code. 2012-12-19 15:44:31 -08:00
include sparc64: Make PAGE_OFFSET variable. 2013-11-12 15:22:34 -08:00
kernel sparc64: Make PAGE_OFFSET variable. 2013-11-12 15:22:34 -08:00
lib sparc64: Make PAGE_OFFSET variable. 2013-11-12 15:22:34 -08:00
math-emu sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads. 2012-10-26 15:18:37 -07:00
mm sparc64: Make PAGE_OFFSET variable. 2013-11-12 15:22:34 -08:00
net net: fix unsafe set_memory_rw from softirq 2013-10-07 15:16:45 -04:00
oprofile
power sparc64: Hibernation support 2013-03-20 11:06:54 -07:00
prom arch: sparc: prom: looping issue, need additional length check in the outside looping 2013-06-19 02:10:29 -07:00
Kbuild sparc64: Add SHA1 driver making use of the 'sha1' instruction. 2012-08-20 15:08:49 -07:00
Kconfig sparc: fix MSI build failure on Sparc32 2013-10-02 20:02:35 -04:00
Kconfig.debug
Makefile sparc64: Hibernation support 2013-03-20 11:06:54 -07:00