powerpc/booke: Don't zero MAS8, it's unnecessary
MAS8 is hypervisor privileged, defining the logical partition (VM) to operate on for TLB accesses. It's already guaranteed to be cleared when booting bare metal (bootloader needs it zeroed to work), and we can't touch it from a guest. Assume that if/when we eventually port bhyve to PowerPC (and Book-E) the hypervisor module will take care of managing MAS8. This saves several (tens) of clocks on each TLB miss. MFC after: 2 weeks
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=353777
@ -252,7 +252,6 @@ __start:
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isync
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li %r4, 0
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mtspr SPR_MAS7, %r4
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bl zero_mas8
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isync
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tlbwe
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isync
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@ -510,7 +509,6 @@ bp_kernload:
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isync
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li %r4, 0
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mtspr SPR_MAS7, %r4
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bl zero_mas8
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isync
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tlbwe
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isync
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@ -702,7 +700,6 @@ tlb1_temp_mapping_as1:
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mflr %r3
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li %r4, 0
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mtspr SPR_MAS7, %r4
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bl zero_mas8
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mtlr %r3
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isync
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tlbwe
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@ -739,24 +736,6 @@ tlb1_inval_all_but_current:
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cmpw %r4, %r3 /* Check if this is the last entry */
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bne 1b
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blr
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/*
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* MAS8 conditional zeroing.
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*/
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.globl zero_mas8
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zero_mas8:
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mfpvr %r20
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rlwinm %r20, %r20, 16, 16, 31
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cmpli 0, 0, %r20, FSL_E500mc
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beq 1f
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cmpli 0, 0, %r20, FSL_E5500
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beq 1f
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blr
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1:
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li %r20, 0
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mtspr SPR_MAS8, %r20
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blr
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#endif
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#ifdef SMP
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@ -767,7 +767,6 @@ search_failed:
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li %r23, 0
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mtspr SPR_MAS7, %r23
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bl zero_mas8
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isync
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tlbwe
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@ -904,10 +903,6 @@ tlb_fill_entry:
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mtspr SPR_MAS3, %r22
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mtspr SPR_MAS7, %r23
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mflr %r21
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bl zero_mas8
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mtlr %r21
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isync
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tlbwe
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isync
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