from_tl1_trap:
rdpr %tl, %g5 ! For TL==3 test
CREATE_VPTE_OFFSET1(%g4, %g6) ! Create VPTE offset
- be,pn %xcc, 3f ! Yep, special processing
+ be,pn %xcc, kvmap ! Yep, special processing
CREATE_VPTE_OFFSET2(%g4, %g6) ! Create VPTE offset
cmp %g5, 4 ! Last trap level?
be,pn %xcc, longpath ! Yep, cannot risk VPTE miss
nop ! Delay-slot
9: stxa %g5, [%g0] ASI_DTLB_DATA_IN ! Reload TLB
retry ! Trap return
-3: brlz,pt %g4, 9b ! Kernel virtual map?
- xor %g2, %g4, %g5 ! Finish bit twiddles
- ba,a,pt %xcc, kvmap ! Yep, go check for obp/vmalloc
+ nop
+ nop
+ nop
/* DTLB ** ICACHE line 3: winfixups+real_faults */
longpath:
.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
- * obp range do not use vpte). If so, go back directly to the faulting address.
- * This is because we want to read the tpc, otherwise we have no way of knowing
- * the 8k aligned faulting address if we are using >8k kernel pagesize. This
- * also ensures no vpte range addresses are dropped into tlb while obp is
- * executing (see inherit_locked_prom_mappings() rant).
- */
-sparc64_vpte_nucleus:
- /* Note that kvmap below has verified that the address is
- * in the range MODULES_VADDR --> VMALLOC_END already. So
- * here we need only check if it is an OBP address or not.
- */
- sethi %hi(LOW_OBP_ADDRESS), %g5
- cmp %g4, %g5
- blu,pn %xcc, sparc64_vpte_patchme1
- mov 0x1, %g5
- sllx %g5, 32, %g5
- cmp %g4, %g5
- blu,pn %xcc, obp_iaddr_patch
- nop
-
- /* These two instructions are patched by paginig_init(). */
-sparc64_vpte_patchme1:
- sethi %hi(0), %g5
-sparc64_vpte_patchme2:
- or %g5, %lo(0), %g5
-
- /* With kernel PGD in %g5, branch back into dtlb_backend. */
- ba,pt %xcc, sparc64_kpte_continue
- andn %g1, 0x3, %g1 /* Finish PMD offset adjustment. */
-
-vpte_noent:
- /* Restore previous TAG_ACCESS, %g5 is zero, and we will
- * skip over the trap instruction so that the top level
- * TLB miss handler will thing this %g5 value is just an
- * invalid PTE, thus branching to full fault processing.
- */
- mov TLB_SFSR, %g1
- 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
-
- /* Behave as if we are at TL0. */
- wrpr %g0, 1, %tl
- rdpr %tpc, %g4 /* Find original faulting iaddr */
- srlx %g4, 13, %g4 /* Throw out context bits */
- sllx %g4, 13, %g4 /* g4 has vpn + ctx0 now */
-
- /* Restore previous TAG_ACCESS. */
- mov TLB_SFSR, %g1
- stxa %g4, [%g1 + %g1] ASI_IMMU
-
- /* Get PMD offset. */
- srlx %g4, 23, %g6
- and %g6, 0x7ff, %g6
- sllx %g6, 2, %g6
-
- /* Load PMD, is it valid? */
- lduwa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
- brz,pn %g5, longpath
- sllx %g5, 11, %g5
-
- /* Get PTE offset. */
- srlx %g4, 13, %g6
- and %g6, 0x3ff, %g6
- sllx %g6, 3, %g6
-
- /* Load PTE. */
- ldxa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
- brgez,pn %g5, longpath
- nop
-
- /* TLB load and return from trap. */
- 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
-
- /* Get PMD offset. */
- srlx %g4, 23, %g6
- and %g6, 0x7ff, %g6
- sllx %g6, 2, %g6
-
- /* Load PMD, is it valid? */
- lduwa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
- brz,pn %g5, longpath
- sllx %g5, 11, %g5
-
- /* Get PTE offset. */
- srlx %g4, 13, %g6
- and %g6, 0x3ff, %g6
- sllx %g6, 3, %g6
-
- /* Load PTE. */
- ldxa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
- brgez,pn %g5, longpath
- nop
-
- /* TLB load and return from trap. */
- stxa %g5, [%g0] ASI_DTLB_DATA_IN
- retry
-
-/*
- * On a first level data miss, check whether this is to the OBP range (note
- * that such accesses can be made by prom, as well as by kernel using
- * prom_getproperty on "address"), and if so, do not use vpte access ...
- * rather, use information saved during inherit_prom_mappings() using 8k
- * pagesize.
- */
- .align 32
-kvmap:
- sethi %hi(MODULES_VADDR), %g5
- cmp %g4, %g5
- blu,pn %xcc, longpath
- mov (VMALLOC_END >> 24), %g5
- sllx %g5, 24, %g5
- cmp %g4, %g5
- bgeu,pn %xcc, longpath
- nop
-
-kvmap_check_obp:
- sethi %hi(LOW_OBP_ADDRESS), %g5
- cmp %g4, %g5
- blu,pn %xcc, kvmap_vmalloc_addr
- mov 0x1, %g5
- sllx %g5, 32, %g5
- cmp %g4, %g5
- blu,pn %xcc, obp_daddr_patch
- nop
-
-kvmap_vmalloc_addr:
- /* If we get here, a vmalloc addr was accessed, load kernel VPTE. */
- ldxa [%g3 + %g6] ASI_N, %g5
- brgez,pn %g5, longpath
- nop
-
- /* PTE is valid, load into TLB and return from trap. */
- stxa %g5, [%g0] ASI_DTLB_DATA_IN ! Reload TLB
- retry
-
/* This is trivial with the new code... */
.globl do_fpdis
do_fpdis:
swapper_pg_dir:
.word 0
+#include "ktlb.S"
#include "etrap.S"
#include "rtrap.S"
#include "winfixup.S"
--- /dev/null
+/* arch/sparc64/kernel/ktlb.S: Kernel mapping TLB miss handling.
+ *
+ * Copyright (C) 1995, 1997, 2005 David S. Miller <davem@davemloft.net>
+ * Copyright (C) 1996 Eddie C. Dost (ecd@brainaid.de)
+ * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
+ * Copyright (C) 1996,98,99 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+*/
+
+#include <linux/config.h>
+#include <asm/head.h>
+#include <asm/asi.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+ .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
+ * obp range do not use vpte). If so, go back directly to the faulting address.
+ * This is because we want to read the tpc, otherwise we have no way of knowing
+ * the 8k aligned faulting address if we are using >8k kernel pagesize. This
+ * also ensures no vpte range addresses are dropped into tlb while obp is
+ * executing (see inherit_locked_prom_mappings() rant).
+ */
+sparc64_vpte_nucleus:
+ /* Note that kvmap below has verified that the address is
+ * in the range MODULES_VADDR --> VMALLOC_END already. So
+ * here we need only check if it is an OBP address or not.
+ */
+ sethi %hi(LOW_OBP_ADDRESS), %g5
+ cmp %g4, %g5
+ blu,pn %xcc, sparc64_vpte_patchme1
+ mov 0x1, %g5
+ sllx %g5, 32, %g5
+ cmp %g4, %g5
+ blu,pn %xcc, obp_iaddr_patch
+ nop
+
+ /* These two instructions are patched by paginig_init(). */
+sparc64_vpte_patchme1:
+ sethi %hi(0), %g5
+sparc64_vpte_patchme2:
+ or %g5, %lo(0), %g5
+
+ /* With kernel PGD in %g5, branch back into dtlb_backend. */
+ ba,pt %xcc, sparc64_kpte_continue
+ andn %g1, 0x3, %g1 /* Finish PMD offset adjustment. */
+
+vpte_noent:
+ /* Restore previous TAG_ACCESS, %g5 is zero, and we will
+ * skip over the trap instruction so that the top level
+ * TLB miss handler will thing this %g5 value is just an
+ * invalid PTE, thus branching to full fault processing.
+ */
+ mov TLB_SFSR, %g1
+ 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
+
+ /* Behave as if we are at TL0. */
+ wrpr %g0, 1, %tl
+ rdpr %tpc, %g4 /* Find original faulting iaddr */
+ srlx %g4, 13, %g4 /* Throw out context bits */
+ sllx %g4, 13, %g4 /* g4 has vpn + ctx0 now */
+
+ /* Restore previous TAG_ACCESS. */
+ mov TLB_SFSR, %g1
+ stxa %g4, [%g1 + %g1] ASI_IMMU
+
+ /* Get PMD offset. */
+ srlx %g4, 23, %g6
+ and %g6, 0x7ff, %g6
+ sllx %g6, 2, %g6
+
+ /* Load PMD, is it valid? */
+ lduwa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
+ brz,pn %g5, longpath
+ sllx %g5, 11, %g5
+
+ /* Get PTE offset. */
+ srlx %g4, 13, %g6
+ and %g6, 0x3ff, %g6
+ sllx %g6, 3, %g6
+
+ /* Load PTE. */
+ ldxa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
+ brgez,pn %g5, longpath
+ nop
+
+ /* TLB load and return from trap. */
+ 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
+
+ /* Get PMD offset. */
+ srlx %g4, 23, %g6
+ and %g6, 0x7ff, %g6
+ sllx %g6, 2, %g6
+
+ /* Load PMD, is it valid? */
+ lduwa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
+ brz,pn %g5, longpath
+ sllx %g5, 11, %g5
+
+ /* Get PTE offset. */
+ srlx %g4, 13, %g6
+ and %g6, 0x3ff, %g6
+ sllx %g6, 3, %g6
+
+ /* Load PTE. */
+ ldxa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
+ brgez,pn %g5, longpath
+ nop
+
+ /* TLB load and return from trap. */
+ stxa %g5, [%g0] ASI_DTLB_DATA_IN
+ retry
+
+/*
+ * On a first level data miss, check whether this is to the OBP range (note
+ * that such accesses can be made by prom, as well as by kernel using
+ * prom_getproperty on "address"), and if so, do not use vpte access ...
+ * rather, use information saved during inherit_prom_mappings() using 8k
+ * pagesize.
+ */
+ .align 32
+kvmap:
+ brlz,pt %g4, kvmap_load
+ xor %g2, %g4, %g5
+
+kvmap_nonlinear:
+ sethi %hi(MODULES_VADDR), %g5
+ cmp %g4, %g5
+ blu,pn %xcc, longpath
+ mov (VMALLOC_END >> 24), %g5
+ sllx %g5, 24, %g5
+ cmp %g4, %g5
+ bgeu,pn %xcc, longpath
+ nop
+
+kvmap_check_obp:
+ sethi %hi(LOW_OBP_ADDRESS), %g5
+ cmp %g4, %g5
+ blu,pn %xcc, kvmap_vmalloc_addr
+ mov 0x1, %g5
+ sllx %g5, 32, %g5
+ cmp %g4, %g5
+ blu,pn %xcc, obp_daddr_patch
+ nop
+
+kvmap_vmalloc_addr:
+ /* If we get here, a vmalloc addr was accessed, load kernel VPTE. */
+ ldxa [%g3 + %g6] ASI_N, %g5
+ brgez,pn %g5, longpath
+ nop
+
+kvmap_load:
+ /* PTE is valid, load into TLB and return from trap. */
+ stxa %g5, [%g0] ASI_DTLB_DATA_IN ! Reload TLB
+ retry
projects / karo-tx-linux.git / commitdiff