查看64位多核 MIPS 异常和中断内核代码分析 (1)的源代码
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64位多核 MIPS 异常和中断内核代码分析 (1)
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===== RMI XLR732 handle_tlbl 分析 ===== <source lang=c> handle_tlbl: c: 403a4000 dmfc0 k0,c0_badvaddr <---- handle_tlbl start 10: 07400027 bltz k0,b0 <0xb0> # if badvaddr >= 0x80000000 00000000 branch 14: 403b2000 dmfc0 k1,c0_context 18: 001bddfa dsrl k1,k1,0x17 /* get (smp_processor_id() << 3) (26-23) */ 1c: 3c1a8396 lui k0,0x8396 /* 0xffffffff83960000 + 0x2000 = pgd_current */ 20: 037ad82d daddu k1,k1,k0 24: 403a4000 dmfc0 k0,c0_badvaddr 28: df7b2000 ld k1,8192(k1) /* pgd = pgd_current[smp_processor_id()] */ @@ 2c: 001ad6fa dsrl k0,k0,0x1b # >> 27 30: 335a1ff8 andi k0,k0,0x1ff8 /* get (vaddr[39:30] << 3), for indexing pgd */ 34: 037ad82d daddu k1,k1,k0 /* index pgd */ 38: 403a4000 dmfc0 k0,c0_badvaddr 3c: df7b0000 ld k1,0(k1) /* get pmd */ 40: 001ad4ba dsrl k0,k0,0x12 # >> 18 44: 335a0ff8 andi k0,k0,0xff8 # get (vaddr[29:21] << 3) 48: 037ad82d daddu k1,k1,k0 # index pmd 4c: 403a4000 dmfc0 k0,c0_badvaddr 50: df7b0000 ld k1,0(k1) # get p_pt 54: 001ad27a dsrl k0,k0,0x9 58: 335a0ff8 andi k0,k0,0xff8 # get (vaddr[20:12]) 5c: 037ad82d daddu k1,k1,k0 # index pt 60: d37a0000 lld k0,0(k1) # get pt entry 64: 42000008 tlbp # to distinguish TLB invalid or TLB refill exception 68: 335a0003 andi k0,k0,0x3 6c: 3b5a0003 xori k0,k0,0x3 # _PRESENT and _READ 70: 1740001a bnez k0,dc <0xdc> # low two bits is not 011, branch @@-->out 74: d37a0000 lld k0,0(k1) # get pt entry again 78: 375a0088 ori k0,k0,0x88 7c: f37a0000 scd k0,0(k1) # set pt entry's pte[7] = 1, pte[3] =1 80: 1340fff7 beqz k0,60 <0x60> 84: 00000000 nop 88: 377b0008 ori k1,k1,0x8 8c: 3b7b0008 xori k1,k1,0x8 # for getting even page 90: df7a0000 ld k0,0(k1) # get even page addr 94: df7b0008 ld k1,8(k1) # get odd page addr 98: 001ad1ba dsrl k0,k0,0x6 9c: 409a1000 mtc0 k0,c0_entrylo0 a0: 001bd9ba dsrl k1,k1,0x6 a4: 409b1800 mtc0 k1,c0_entrylo1 a8: 42000002 tlbwi ac: 42000018 eret @@ b0: 001ad8b8 dsll k1,k0,0x2 # go here, vaddr is in xkphys or xkseg (>0x8000..0000) # 0x8000..0000 ~ 0xc000..0000 is xkphys, unmapped, # so vaddr > 0xc000..0000; vaddr << 2 b4: 07610005 bgez k1,cc <0xcc> # vaddr[61] != 1 (0xc000..0000 ~ 0xdfff..ffff), branch b8: 3c1bc000 lui k1,0xc000 # vaddr, 0xe000..0000 ~ 0xffff..ffff bc: 035bd02f dsubu k0,k0,k1 # k0 = vaddr - 0xffffffffc0000000 c0: 3c1b8396 lui k1,0x8396 c4: 1000ffd9 b 2c <0x2c> c8: 277ba000 addiu k1,k1,-24576 # k1 = 0xffffffff8395a000, module_pg_dir # module_pg_dir & swapper_pg_dir don't need the smp @@ # vaddr, 0xc000..0000 ~ 0xdfff..ffff cc: 001bd83c dsll32 k1,k1,0x0 # 0xc0000000 00000000 d0: 035bd02f dsubu k0,k0,k1 # k0 = vaddr - 0xc0000000 00000000 d4: 1000ffd5 b 2c <0x2c> d8: 3c1b8396 lui k1,0x8396 # only swapper_pg_current @@-->do_page_fault dc: 08d01150 j 3404540 <0x3404540> e0: 00000000 nop ... </source> <br><br>
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64位多核 MIPS 异常和中断内核代码分析 (1)
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