From 1ac4f5ebaa496a23ab4a148c9864d7e30a6c6cd3 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Wed, 21 Sep 2005 21:49:32 -0700 Subject: [SPARC64]: Remove ktlb.S instruction patching. This was kind of ugly, and actually buggy. The bug was that we didn't handle a machine with memory starting > 4GB. If the 'prompmd' was allocated in physical memory > 4GB we'd croak because the obp_iaddr_patch and obp_daddr_patch things only supported a 32-bit physical address. So fix this by just loading the appropriate values from two variables in the kernel image, which is locked into the TLB and thus accesses to them can't cause a recursive TLB miss. Signed-off-by: David S. Miller --- arch/sparc64/kernel/ktlb.S | 31 ++++++++++++------------------- 1 file changed, 12 insertions(+), 19 deletions(-) (limited to 'arch/sparc64/kernel/ktlb.S') diff --git a/arch/sparc64/kernel/ktlb.S b/arch/sparc64/kernel/ktlb.S index b7176792c9a..a591bc0ebc7 100644 --- a/arch/sparc64/kernel/ktlb.S +++ b/arch/sparc64/kernel/ktlb.S @@ -15,8 +15,6 @@ .text .align 32 - .globl sparc64_vpte_patchme1 - .globl sparc64_vpte_patchme2 /* * On a second level vpte miss, check whether the original fault is to the OBP * range (note that this is only possible for instruction miss, data misses to @@ -33,18 +31,17 @@ sparc64_vpte_nucleus: */ sethi %hi(LOW_OBP_ADDRESS), %g5 cmp %g4, %g5 - blu,pn %xcc, sparc64_vpte_patchme1 + blu,pn %xcc, kern_vpte mov 0x1, %g5 sllx %g5, 32, %g5 cmp %g4, %g5 - blu,pn %xcc, obp_iaddr_patch + blu,pn %xcc, vpte_insn_obp nop /* These two instructions are patched by paginig_init(). */ -sparc64_vpte_patchme1: - sethi %hi(0), %g5 -sparc64_vpte_patchme2: - or %g5, %lo(0), %g5 +kern_vpte: + sethi %hi(swapper_pgd_zero), %g5 + lduw [%g5 + %lo(swapper_pgd_zero)], %g5 /* With kernel PGD in %g5, branch back into dtlb_backend. */ ba,pt %xcc, sparc64_kpte_continue @@ -60,11 +57,9 @@ vpte_noent: stxa %g4, [%g1 + %g1] ASI_DMMU done - .globl obp_iaddr_patch -obp_iaddr_patch: - /* These two instructions patched by inherit_prom_mappings(). */ - sethi %hi(0), %g5 - or %g5, %lo(0), %g5 +vpte_insn_obp: + sethi %hi(prom_pmd_phys), %g5 + ldx [%g5 + %lo(prom_pmd_phys)], %g5 /* Behave as if we are at TL0. */ wrpr %g0, 1, %tl @@ -100,11 +95,9 @@ obp_iaddr_patch: stxa %g5, [%g0] ASI_ITLB_DATA_IN retry - .globl obp_daddr_patch -obp_daddr_patch: - /* These two instructions patched by inherit_prom_mappings(). */ - sethi %hi(0), %g5 - or %g5, %lo(0), %g5 +kvmap_do_obp: + sethi %hi(prom_pmd_phys), %g5 + ldx [%g5 + %lo(prom_pmd_phys)], %g5 /* Get PMD offset. */ srlx %g4, 23, %g6 @@ -159,7 +152,7 @@ kvmap_check_obp: mov 0x1, %g5 sllx %g5, 32, %g5 cmp %g4, %g5 - blu,pn %xcc, obp_daddr_patch + blu,pn %xcc, kvmap_do_obp nop kvmap_vmalloc_addr: -- cgit v1.2.3-70-g09d2