mirror of https://github.com/n64decomp/mk64.git
65 lines
1.2 KiB
ArmAsm
65 lines
1.2 KiB
ArmAsm
.set noat # allow manual use of $at
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.set noreorder # don't insert nops after branches
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.set gp=64
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.include "macros.inc"
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.section .text, "ax"
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glabel __osProbeTLB
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mfc0 $t0, C0_ENTRYHI
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andi $t1, $t0, TLBHI_PIDMASK
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li $at, TLBHI_VPN2MASK
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and $t2, $a0, $at
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or $t1, $t1, $t2
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mtc0 $t1, C0_ENTRYHI
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nop
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nop
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nop
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tlbp
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nop
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nop
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mfc0 $t3, C0_INX
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lui $at, %hi(TLBINX_PROBE)
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and $t3, $t3, $at
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bnez $t3, .L8032A0D8
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nop
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tlbr
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nop
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nop
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nop
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mfc0 $t3, C0_PAGEMASK
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addi $t3, $t3, DCACHE_SIZE
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srl $t3, $t3, 1
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and $t4, $t3, $a0
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bnez $t4, .L8032A0A8
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addi $t3, $t3, -1
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mfc0 $v0, C0_ENTRYLO0
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b .L8032A0AC
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nop
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.L8032A0A8:
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mfc0 $v0, C0_ENTRYLO1
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.L8032A0AC:
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andi $t5, $v0, TLBLO_V
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beqz $t5, .L8032A0D8
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nop
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lui $at, (TLBLO_PFNMASK >> 16) # lui $at, 0x3fff
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ori $at, %lo(TLBLO_PFNMASK) # ori $at, $at, 0xffc0
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and $v0, $v0, $at
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sll $v0, $v0, TLBLO_PFNSHIFT
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and $t5, $a0, $t3
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add $v0, $v0, $t5
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b .L8032A0DC
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nop
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.L8032A0D8:
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li $v0, -1
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.L8032A0DC:
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mtc0 $t0, C0_ENTRYHI
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jr $ra
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nop
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nop
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nop
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