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author | David S. Miller <davem@sunset.davemloft.net> | 2006-02-02 02:55:21 +0300 |
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committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-20 12:11:32 +0300 |
commit | 517af33237ecfc3c8a93b335365fa61e741ceca4 (patch) | |
tree | 58eff40eb4c517c4fd49fd347d38273ee1e1ee4b /include/asm-sparc64/tsb.h | |
parent | b0fd4e49aea8a460afab7bc67cd618e2d19291d4 (diff) | |
download | linux-517af33237ecfc3c8a93b335365fa61e741ceca4.tar.xz |
[SPARC64]: Access TSB with physical addresses when possible.
This way we don't need to lock the TSB into the TLB.
The trick is that every TSB load/store is registered into
a special instruction patch section. The default uses
virtual addresses, and the patch instructions use physical
address load/stores.
We can't do this on all chips because only cheetah+ and later
have the physical variant of the atomic quad load.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/asm-sparc64/tsb.h')
-rw-r--r-- | include/asm-sparc64/tsb.h | 94 |
1 files changed, 89 insertions, 5 deletions
diff --git a/include/asm-sparc64/tsb.h b/include/asm-sparc64/tsb.h index f384565212fe..44709cde5617 100644 --- a/include/asm-sparc64/tsb.h +++ b/include/asm-sparc64/tsb.h @@ -44,7 +44,89 @@ #define TSB_MEMBAR membar #StoreStore +/* Some cpus support physical address quad loads. We want to use + * those if possible so we don't need to hard-lock the TSB mapping + * into the TLB. We encode some instruction patching in order to + * support this. + * + * The kernel TSB is locked into the TLB by virtue of being in the + * kernel image, so we don't play these games for swapper_tsb access. + */ +#ifndef __ASSEMBLY__ +struct tsb_phys_patch_entry { + unsigned int addr; + unsigned int insn; +}; +extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end; +#endif +#define TSB_LOAD_QUAD(TSB, REG) \ +661: ldda [TSB] ASI_NUCLEUS_QUAD_LDD, REG; \ + .section .tsb_phys_patch, "ax"; \ + .word 661b; \ + ldda [TSB] ASI_QUAD_LDD_PHYS, REG; \ + .previous + +#define TSB_LOAD_TAG_HIGH(TSB, REG) \ +661: lduwa [TSB] ASI_N, REG; \ + .section .tsb_phys_patch, "ax"; \ + .word 661b; \ + lduwa [TSB] ASI_PHYS_USE_EC, REG; \ + .previous + +#define TSB_LOAD_TAG(TSB, REG) \ +661: ldxa [TSB] ASI_N, REG; \ + .section .tsb_phys_patch, "ax"; \ + .word 661b; \ + ldxa [TSB] ASI_PHYS_USE_EC, REG; \ + .previous + +#define TSB_CAS_TAG_HIGH(TSB, REG1, REG2) \ +661: casa [TSB] ASI_N, REG1, REG2; \ + .section .tsb_phys_patch, "ax"; \ + .word 661b; \ + casa [TSB] ASI_PHYS_USE_EC, REG1, REG2; \ + .previous + +#define TSB_CAS_TAG(TSB, REG1, REG2) \ +661: casxa [TSB] ASI_N, REG1, REG2; \ + .section .tsb_phys_patch, "ax"; \ + .word 661b; \ + casxa [TSB] ASI_PHYS_USE_EC, REG1, REG2; \ + .previous + +#define TSB_STORE(ADDR, VAL) \ +661: stxa VAL, [ADDR] ASI_N; \ + .section .tsb_phys_patch, "ax"; \ + .word 661b; \ + stxa VAL, [ADDR] ASI_PHYS_USE_EC; \ + .previous + #define TSB_LOCK_TAG(TSB, REG1, REG2) \ +99: TSB_LOAD_TAG_HIGH(TSB, REG1); \ + sethi %hi(TSB_TAG_LOCK_HIGH), REG2;\ + andcc REG1, REG2, %g0; \ + bne,pn %icc, 99b; \ + nop; \ + TSB_CAS_TAG_HIGH(TSB, REG1, REG2); \ + cmp REG1, REG2; \ + bne,pn %icc, 99b; \ + nop; \ + TSB_MEMBAR + +#define TSB_WRITE(TSB, TTE, TAG) \ + add TSB, 0x8, TSB; \ + TSB_STORE(TSB, TTE); \ + sub TSB, 0x8, TSB; \ + TSB_MEMBAR; \ + TSB_STORE(TSB, TAG); + +#define KTSB_LOAD_QUAD(TSB, REG) \ + ldda [TSB] ASI_NUCLEUS_QUAD_LDD, REG; + +#define KTSB_STORE(ADDR, VAL) \ + stxa VAL, [ADDR] ASI_N; + +#define KTSB_LOCK_TAG(TSB, REG1, REG2) \ 99: lduwa [TSB] ASI_N, REG1; \ sethi %hi(TSB_TAG_LOCK_HIGH), REG2;\ andcc REG1, REG2, %g0; \ @@ -56,10 +138,12 @@ nop; \ TSB_MEMBAR -#define TSB_WRITE(TSB, TTE, TAG) \ - stx TTE, [TSB + 0x08]; \ - TSB_MEMBAR; \ - stx TAG, [TSB + 0x00]; +#define KTSB_WRITE(TSB, TTE, TAG) \ + add TSB, 0x8, TSB; \ + stxa TTE, [TSB] ASI_N; \ + sub TSB, 0x8, TSB; \ + TSB_MEMBAR; \ + stxa TAG, [TSB] ASI_N; /* Do a kernel page table walk. Leaves physical PTE pointer in * REG1. Jumps to FAIL_LABEL on early page table walk termination. @@ -157,7 +241,7 @@ and REG2, (KERNEL_TSB_NENTRIES - 1), REG2; \ sllx REG2, 4, REG2; \ add REG1, REG2, REG2; \ - ldda [REG2] ASI_NUCLEUS_QUAD_LDD, REG3; \ + KTSB_LOAD_QUAD(REG2, REG3); \ cmp REG3, TAG; \ be,a,pt %xcc, OK_LABEL; \ mov REG4, REG1; |