From 74bf4312fff083ab25c3f357cc653ada7995e5f6 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 31 Jan 2006 18:29:18 -0800 Subject: [SPARC64]: Move away from virtual page tables, part 1. We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller --- arch/sparc64/mm/ultra.S | 58 ------------------------------------------------- 1 file changed, 58 deletions(-) (limited to 'arch/sparc64/mm/ultra.S') diff --git a/arch/sparc64/mm/ultra.S b/arch/sparc64/mm/ultra.S index e4c9151fa116..22791f29552e 100644 --- a/arch/sparc64/mm/ultra.S +++ b/arch/sparc64/mm/ultra.S @@ -453,64 +453,6 @@ xcall_flush_dcache_page_spitfire: /* %g1 == physical page address nop nop - .data - -errata32_hwbug: - .xword 0 - - .text - - /* These two are not performance critical... */ - .globl xcall_flush_tlb_all_spitfire -xcall_flush_tlb_all_spitfire: - /* Spitfire Errata #32 workaround. */ - sethi %hi(errata32_hwbug), %g4 - stx %g0, [%g4 + %lo(errata32_hwbug)] - - clr %g2 - clr %g3 -1: ldxa [%g3] ASI_DTLB_DATA_ACCESS, %g4 - and %g4, _PAGE_L, %g5 - brnz,pn %g5, 2f - mov TLB_TAG_ACCESS, %g7 - - stxa %g0, [%g7] ASI_DMMU - membar #Sync - stxa %g0, [%g3] ASI_DTLB_DATA_ACCESS - membar #Sync - - /* Spitfire Errata #32 workaround. */ - sethi %hi(errata32_hwbug), %g4 - stx %g0, [%g4 + %lo(errata32_hwbug)] - -2: ldxa [%g3] ASI_ITLB_DATA_ACCESS, %g4 - and %g4, _PAGE_L, %g5 - brnz,pn %g5, 2f - mov TLB_TAG_ACCESS, %g7 - - stxa %g0, [%g7] ASI_IMMU - membar #Sync - stxa %g0, [%g3] ASI_ITLB_DATA_ACCESS - membar #Sync - - /* Spitfire Errata #32 workaround. */ - sethi %hi(errata32_hwbug), %g4 - stx %g0, [%g4 + %lo(errata32_hwbug)] - -2: add %g2, 1, %g2 - cmp %g2, SPITFIRE_HIGHEST_LOCKED_TLBENT - ble,pt %icc, 1b - sll %g2, 3, %g3 - flush %g6 - retry - - .globl xcall_flush_tlb_all_cheetah -xcall_flush_tlb_all_cheetah: - mov 0x80, %g2 - stxa %g0, [%g2] ASI_DMMU_DEMAP - stxa %g0, [%g2] ASI_IMMU_DEMAP - retry - /* These just get rescheduled to PIL vectors. */ .globl xcall_call_function xcall_call_function: -- cgit v1.2.2