[PATCH] ppc64: dynamically allocate segment tables

PPC64 machines before Power4 need a segment table page allocated for each
CPU.  Currently these are allocated statically in a big array in head.S for
all CPUs.  The segment tables need to be in the first segment (so
do_stab_bolted doesn't take a recursive fault on the stab itself), but
other than that there are no constraints which require the stabs for the
secondary CPUs to be statically allocated.

This patch allocates segment tables dynamically during boot, using
lmb_alloc() to ensure they are within the first 256M segment.  This reduces
the kernel image size by 192k...

Tested on RS64 iSeries, POWER3 pSeries, and POWER5.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

This commit is contained in:

David Gibson

2005-07-27 11:44:19 -07:00

committed by

Linus Torvalds

parent 6fdfb38281

commit 533f08172e

5 changed files with 39 additions and 22 deletions

									
										include/asm-ppc64/mmu.h
									
		+2
		
												View File
												
				@@ -200,6 +200,8 @@ extern long native_hpte_insert(unsigned long hpte_group, unsigned long va,

							       unsigned long prpn,

							       unsigned long vflags, unsigned long rflags);

				extern void stabs_alloc(void);

				#endif /* __ASSEMBLY__ */

				/*