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linux/arch/sparc64/kernel/ktlb.S

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[SPARC64]: Move kernel TLB miss handling into a seperate file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 01:50:51 +00:00
/* 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
/*
* 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
[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 <davem@davemloft.net>
2005-09-22 04:49:32 +00:00
blu,pn %xcc, kern_vpte
[SPARC64]: Move kernel TLB miss handling into a seperate file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 01:50:51 +00:00
mov 0x1, %g5
sllx %g5, 32, %g5
cmp %g4, %g5
[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 <davem@davemloft.net>
2005-09-22 04:49:32 +00:00
blu,pn %xcc, vpte_insn_obp
[SPARC64]: Move kernel TLB miss handling into a seperate file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 01:50:51 +00:00
nop
/* These two instructions are patched by paginig_init(). */
[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 <davem@davemloft.net>
2005-09-22 04:49:32 +00:00
kern_vpte:
sethi %hi(swapper_pgd_zero), %g5
lduw [%g5 + %lo(swapper_pgd_zero)], %g5
[SPARC64]: Move kernel TLB miss handling into a seperate file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 01:50:51 +00:00
/* 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
[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 <davem@davemloft.net>
2005-09-22 04:49:32 +00:00
vpte_insn_obp:
sethi %hi(prom_pmd_phys), %g5
ldx [%g5 + %lo(prom_pmd_phys)], %g5
[SPARC64]: Move kernel TLB miss handling into a seperate file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 01:50:51 +00:00
/* 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
[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 <davem@davemloft.net>
2005-09-22 04:49:32 +00:00
kvmap_do_obp:
sethi %hi(prom_pmd_phys), %g5
ldx [%g5 + %lo(prom_pmd_phys)], %g5
[SPARC64]: Move kernel TLB miss handling into a seperate file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 01:50:51 +00:00
/* 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:
[SPARC64]: Add CONFIG_DEBUG_PAGEALLOC support. The trick is that we do the kernel linear mapping TLB miss starting with an instruction sequence like this: ba,pt %xcc, kvmap_load xor %g2, %g4, %g5 succeeded by an instruction sequence which performs a full page table walk starting at swapper_pg_dir. We first take over the trap table from the firmware. Then, using this constant PTE generation for the linear mapping area above, we build the kernel page tables for the linear mapping. After this is setup, we patch that branch above into a "nop", which will cause TLB misses to fall through to the full page table walk. With this, the page unmapping for CONFIG_DEBUG_PAGEALLOC is trivial. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-25 23:46:57 +00:00
brgez,pn %g4, kvmap_nonlinear
nop
#ifdef CONFIG_DEBUG_PAGEALLOC
.globl kvmap_linear_patch
kvmap_linear_patch:
#endif
ba,pt %xcc, kvmap_load
[SPARC64]: Move kernel TLB miss handling into a seperate file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 01:50:51 +00:00
xor %g2, %g4, %g5
[SPARC64]: Add CONFIG_DEBUG_PAGEALLOC support. The trick is that we do the kernel linear mapping TLB miss starting with an instruction sequence like this: ba,pt %xcc, kvmap_load xor %g2, %g4, %g5 succeeded by an instruction sequence which performs a full page table walk starting at swapper_pg_dir. We first take over the trap table from the firmware. Then, using this constant PTE generation for the linear mapping area above, we build the kernel page tables for the linear mapping. After this is setup, we patch that branch above into a "nop", which will cause TLB misses to fall through to the full page table walk. With this, the page unmapping for CONFIG_DEBUG_PAGEALLOC is trivial. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-25 23:46:57 +00:00
#ifdef CONFIG_DEBUG_PAGEALLOC
sethi %hi(swapper_pg_dir), %g5
or %g5, %lo(swapper_pg_dir), %g5
sllx %g4, 64 - (PGDIR_SHIFT + PGDIR_BITS), %g6
srlx %g6, 64 - PAGE_SHIFT, %g6
andn %g6, 0x3, %g6
lduw [%g5 + %g6], %g5
brz,pn %g5, longpath
sllx %g4, 64 - (PMD_SHIFT + PMD_BITS), %g6
srlx %g6, 64 - PAGE_SHIFT, %g6
sllx %g5, 11, %g5
andn %g6, 0x3, %g6
lduwa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
brz,pn %g5, longpath
sllx %g4, 64 - PMD_SHIFT, %g6
srlx %g6, 64 - PAGE_SHIFT, %g6
sllx %g5, 11, %g5
andn %g6, 0x7, %g6
ldxa [%g5 + %g6] ASI_PHYS_USE_EC, %g5
brz,pn %g5, longpath
nop
ba,a,pt %xcc, kvmap_load
#endif
[SPARC64]: Move kernel TLB miss handling into a seperate file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 01:50:51 +00:00
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
[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 <davem@davemloft.net>
2005-09-22 04:49:32 +00:00
blu,pn %xcc, kvmap_do_obp
[SPARC64]: Move kernel TLB miss handling into a seperate file. Signed-off-by: David S. Miller <davem@davemloft.net>
2005-09-22 01:50:51 +00:00
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
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