/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Synthesize TLB refill handlers at runtime. * * Copyright (C) 2004, 2005, 2006, 2008 Thiemo Seufer * Copyright (C) 2005, 2007, 2008, 2009 Maciej W. Rozycki * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org) * Copyright (C) 2008, 2009 Cavium Networks, Inc. * * ... and the days got worse and worse and now you see * I've gone completly out of my mind. * * They're coming to take me a away haha * they're coming to take me a away hoho hihi haha * to the funny farm where code is beautiful all the time ... * * (Condolences to Napoleon XIV) */ #include #include #include #include #include #include #include #include #include #include #include /* * TLB load/store/modify handlers. * * Only the fastpath gets synthesized at runtime, the slowpath for * do_page_fault remains normal asm. */ extern void tlb_do_page_fault_0(void); extern void tlb_do_page_fault_1(void); static inline int r45k_bvahwbug(void) { /* XXX: We should probe for the presence of this bug, but we don't. */ return 0; } static inline int r4k_250MHZhwbug(void) { /* XXX: We should probe for the presence of this bug, but we don't. */ return 0; } static inline int __maybe_unused bcm1250_m3_war(void) { return BCM1250_M3_WAR; } static inline int __maybe_unused r10000_llsc_war(void) { return R10000_LLSC_WAR; } static int use_bbit_insns(void) { switch (current_cpu_type()) { case CPU_CAVIUM_OCTEON: case CPU_CAVIUM_OCTEON_PLUS: case CPU_CAVIUM_OCTEON2: return 1; default: return 0; } } /* * Found by experiment: At least some revisions of the 4kc throw under * some circumstances a machine check exception, triggered by invalid * values in the index register. Delaying the tlbp instruction until * after the next branch, plus adding an additional nop in front of * tlbwi/tlbwr avoids the invalid index register values. Nobody knows * why; it's not an issue caused by the core RTL. * */ static int __cpuinit m4kc_tlbp_war(void) { return (current_cpu_data.processor_id & 0xffff00) == (PRID_COMP_MIPS | PRID_IMP_4KC); } /* Handle labels (which must be positive integers). */ enum label_id { label_second_part = 1, label_leave, label_vmalloc, label_vmalloc_done, label_tlbw_hazard, label_split, label_tlbl_goaround1, label_tlbl_goaround2, label_nopage_tlbl, label_nopage_tlbs, label_nopage_tlbm, label_smp_pgtable_change, label_r3000_write_probe_fail, label_large_segbits_fault, #ifdef CONFIG_HUGETLB_PAGE label_tlb_huge_update, #endif }; UASM_L_LA(_second_part) UASM_L_LA(_leave) UASM_L_LA(_vmalloc) UASM_L_LA(_vmalloc_done) UASM_L_LA(_tlbw_hazard) UASM_L_LA(_split) UASM_L_LA(_tlbl_goaround1) UASM_L_LA(_tlbl_goaround2) UASM_L_LA(_nopage_tlbl) UASM_L_LA(_nopage_tlbs) UASM_L_LA(_nopage_tlbm) UASM_L_LA(_smp_pgtable_change) UASM_L_LA(_r3000_write_probe_fail) UASM_L_LA(_large_segbits_fault) #ifdef CONFIG_HUGETLB_PAGE UASM_L_LA(_tlb_huge_update) #endif /* * For debug purposes. */ static inline void dump_handler(const u32 *handler, int count) { int i; pr_debug("\t.set push\n"); pr_debug("\t.set noreorder\n"); for (i = 0; i < count; i++) pr_debug("\t%p\t.word 0x%08x\n", &handler[i], handler[i]); pr_debug("\t.set pop\n"); } /* The only general purpose registers allowed in TLB handlers. */ #define K0 26 #define K1 27 /* Some CP0 registers */ #define C0_INDEX 0, 0 #define C0_ENTRYLO0 2, 0 #define C0_TCBIND 2, 2 #define C0_ENTRYLO1 3, 0 #define C0_CONTEXT 4, 0 #define C0_PAGEMASK 5, 0 #define C0_BADVADDR 8, 0 #define C0_ENTRYHI 10, 0 #define C0_EPC 14, 0 #define C0_XCONTEXT 20, 0 #ifdef CONFIG_64BIT # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_XCONTEXT) #else # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_CONTEXT) #endif /* The worst case length of the handler is around 18 instructions for * R3000-style TLBs and up to 63 instructions for R4000-style TLBs. * Maximum space available is 32 instructions for R3000 and 64 * instructions for R4000. * * We deliberately chose a buffer size of 128, so we won't scribble * over anything important on overflow before we panic. */ static u32 tlb_handler[128] __cpuinitdata; /* simply assume worst case size for labels and relocs */ static struct uasm_label labels[128] __cpuinitdata; static struct uasm_reloc relocs[128] __cpuinitdata; #ifdef CONFIG_64BIT static int check_for_high_segbits __cpuinitdata; #endif #ifdef CONFIG_MIPS_PGD_C0_CONTEXT static unsigned int kscratch_used_mask __cpuinitdata; static int __cpuinit allocate_kscratch(void) { int r; unsigned int a = cpu_data[0].kscratch_mask & ~kscratch_used_mask; r = ffs(a); if (r == 0) return -1; r--; /* make it zero based */ kscratch_used_mask |= (1 << r); return r; } static int pgd_reg __cpuinitdata; #else /* !CONFIG_MIPS_PGD_C0_CONTEXT*/ /* * CONFIG_MIPS_PGD_C0_CONTEXT implies 64 bit and lack of pgd_current, * we cannot do r3000 under these circumstances. * * Declare pgd_current here instead of including mmu_context.h to avoid type * conflicts for tlbmiss_handler_setup_pgd */ extern unsigned long pgd_current[]; /* * The R3000 TLB handler is simple. */ static void __cpuinit build_r3000_tlb_refill_handler(void) { long pgdc = (long)pgd_current; u32 *p; memset(tlb_handler, 0, sizeof(tlb_handler)); p = tlb_handler; uasm_i_mfc0(&p, K0, C0_BADVADDR); uasm_i_lui(&p, K1, uasm_rel_hi(pgdc)); /* cp0 delay */ uasm_i_lw(&p, K1, uasm_rel_lo(pgdc), K1); uasm_i_srl(&p, K0, K0, 22); /* load delay */ uasm_i_sll(&p, K0, K0, 2); uasm_i_addu(&p, K1, K1, K0); uasm_i_mfc0(&p, K0, C0_CONTEXT); uasm_i_lw(&p, K1, 0, K1); /* cp0 delay */ uasm_i_andi(&p, K0, K0, 0xffc); /* load delay */ uasm_i_addu(&p, K1, K1, K0); uasm_i_lw(&p, K0, 0, K1); uasm_i_nop(&p); /* load delay */ uasm_i_mtc0(&p, K0, C0_ENTRYLO0); uasm_i_mfc0(&p, K1, C0_EPC); /* cp0 delay */ uasm_i_tlbwr(&p); /* cp0 delay */ uasm_i_jr(&p, K1); uasm_i_rfe(&p); /* branch delay */ if (p > tlb_handler + 32) panic("TLB refill handler space exceeded"); pr_debug("Wrote TLB refill handler (%u instructions).\n", (unsigned int)(p - tlb_handler)); memcpy((void *)ebase, tlb_handler, 0x80); dump_handler((u32 *)ebase, 32); } #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */ /* * The R4000 TLB handler is much more complicated. We have two * consecutive handler areas with 32 instructions space each. * Since they aren't used at the same time, we can overflow in the * other one.To keep things simple, we first assume linear space, * then we relocate it to the final handler layout as needed. */ static u32 final_handler[64] __cpuinitdata; /* * Hazards * * From the IDT errata for the QED RM5230 (Nevada), processor revision 1.0: * 2. A timing hazard exists for the TLBP instruction. * * stalling_instruction * TLBP * * The JTLB is being read for the TLBP throughout the stall generated by the * previous instruction. This is not really correct as the stalling instruction * can modify the address used to access the JTLB. The failure symptom is that * the TLBP instruction will use an address created for the stalling instruction * and not the address held in C0_ENHI and thus report the wrong results. * * The software work-around is to not allow the instruction preceding the TLBP * to stall - make it an NOP or some other instruction guaranteed not to stall. * * Errata 2 will not be fixed. This errata is also on the R5000. * * As if we MIPS hackers wouldn't know how to nop pipelines happy ... */ static void __cpuinit __maybe_unused build_tlb_probe_entry(u32 **p) { switch (current_cpu_type()) { /* Found by experiment: R4600 v2.0/R4700 needs this, too. */ case CPU_R4600: case CPU_R4700: case CPU_R5000: case CPU_R5000A: case CPU_NEVADA: uasm_i_nop(p); uasm_i_tlbp(p); break; default: uasm_i_tlbp(p); break; } } /* * Write random or indexed TLB entry, and care about the hazards from * the preceeding mtc0 and for the following eret. */ enum tlb_write_entry { tlb_random, tlb_indexed }; static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l, struct uasm_reloc **r, enum tlb_write_entry wmode) { void(*tlbw)(u32 **) = NULL; switch (wmode) { case tlb_random: tlbw = uasm_i_tlbwr; break; case tlb_indexed: tlbw = uasm_i_tlbwi; break; } if (cpu_has_mips_r2) { if (cpu_has_mips_r2_exec_hazard) uasm_i_ehb(p); tlbw(p); return; } switch (current_cpu_type()) { case CPU_R4000PC: case CPU_R4000SC: case CPU_R4000MC: case CPU_R4400PC: case CPU_R4400SC: case CPU_R4400MC: /* * This branch uses up a mtc0 hazard nop slot and saves * two nops after the tlbw instruction. */ uasm_il_bgezl(p, r, 0, label_tlbw_hazard); tlbw(p); uasm_l_tlbw_hazard(l, *p); uasm_i_nop(p); break; case CPU_R4600: case CPU_R4700: case CPU_R5000: case CPU_R5000A: uasm_i_nop(p); tlbw(p); uasm_i_nop(p); break; case CPU_R4300: case CPU_5KC: case CPU_TX49XX: case CPU_PR4450: uasm_i_nop(p); tlbw(p); break; case CPU_R10000: case CPU_R12000: case CPU_R14000: case CPU_4KC: case CPU_4KEC: case CPU_SB1: case CPU_SB1A: case CPU_4KSC: case CPU_20KC: case CPU_25KF: case CPU_BMIPS32: case CPU_BMIPS3300: case CPU_BMIPS4350: case CPU_BMIPS4380: case CPU_BMIPS5000: case CPU_LOONGSON2: case CPU_R5500: if (m4kc_tlbp_war()) uasm_i_nop(p); case CPU_ALCHEMY: tlbw(p); break; case CPU_NEVADA: uasm_i_nop(p); /* QED specifies 2 nops hazard */ /* * This branch uses up a mtc0 hazard nop slot and saves * a nop after the tlbw instruction. */ uasm_il_bgezl(p, r, 0, label_tlbw_hazard); tlbw(p); uasm_l_tlbw_hazard(l, *p); break; case CPU_RM7000: uasm_i_nop(p); uasm_i_nop(p); uasm_i_nop(p); uasm_i_nop(p); tlbw(p); break; case CPU_RM9000: /* * When the JTLB is updated by tlbwi or tlbwr, a subsequent * use of the JTLB for instructions should not occur for 4 * cpu cycles and use for data translations should not occur * for 3 cpu cycles. */ uasm_i_ssnop(p); uasm_i_ssnop(p); uasm_i_ssnop(p); uasm_i_ssnop(p); tlbw(p); uasm_i_ssnop(p); uasm_i_ssnop(p); uasm_i_ssnop(p); uasm_i_ssnop(p); break; case CPU_VR4111: case CPU_VR4121: case CPU_VR4122: case CPU_VR4181: case CPU_VR4181A: uasm_i_nop(p); uasm_i_nop(p); tlbw(p); uasm_i_nop(p); uasm_i_nop(p); break; case CPU_VR4131: case CPU_VR4133: case CPU_R5432: uasm_i_nop(p); uasm_i_nop(p); tlbw(p); break; case CPU_JZRISC: tlbw(p); uasm_i_nop(p); break; default: panic("No TLB refill handler yet (CPU type: %d)", current_cpu_data.cputype); break; } } static __cpuinit __maybe_unused void build_convert_pte_to_entrylo(u32 **p, unsigned int reg) { if (kernel_uses_smartmips_rixi) { UASM_i_SRL(p, reg, reg, ilog2(_PAGE_NO_EXEC)); UASM_i_ROTR(p, reg, reg, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); } else { #ifdef CONFIG_64BIT_PHYS_ADDR uasm_i_dsrl_safe(p, reg, reg, ilog2(_PAGE_GLOBAL)); #else UASM_i_SRL(p, reg, reg, ilog2(_PAGE_GLOBAL)); #endif } } #ifdef CONFIG_HUGETLB_PAGE static __cpuinit void build_restore_pagemask(u32 **p, struct uasm_reloc **r, unsigned int tmp, enum label_id lid) { /* Reset default page size */ if (PM_DEFAULT_MASK >> 16) { uasm_i_lui(p, tmp, PM_DEFAULT_MASK >> 16); uasm_i_ori(p, tmp, tmp, PM_DEFAULT_MASK & 0xffff); uasm_il_b(p, r, lid); uasm_i_mtc0(p, tmp, C0_PAGEMASK); } else if (PM_DEFAULT_MASK) { uasm_i_ori(p, tmp, 0, PM_DEFAULT_MASK); uasm_il_b(p, r, lid); uasm_i_mtc0(p, tmp, C0_PAGEMASK); } else { uasm_il_b(p, r, lid); uasm_i_mtc0(p, 0, C0_PAGEMASK); } } static __cpuinit void build_huge_tlb_write_entry(u32 **p, struct uasm_label **l, struct uasm_reloc **r, unsigned int tmp, enum tlb_write_entry wmode) { /* Set huge page tlb entry size */ uasm_i_lui(p, tmp, PM_HUGE_MASK >> 16); uasm_i_ori(p, tmp, tmp, PM_HUGE_MASK & 0xffff); uasm_i_mtc0(p, tmp, C0_PAGEMASK); build_tlb_write_entry(p, l, r, wmode); build_restore_pagemask(p, r, tmp, label_leave); } /* * Check if Huge PTE is present, if so then jump to LABEL. */ static void __cpuinit build_is_huge_pte(u32 **p, struct uasm_reloc **r, unsigned int tmp, unsigned int pmd, int lid) { UASM_i_LW(p, tmp, 0, pmd); if (use_bbit_insns()) { uasm_il_bbit1(p, r, tmp, ilog2(_PAGE_HUGE), lid); } else { uasm_i_andi(p, tmp, tmp, _PAGE_HUGE); uasm_il_bnez(p, r, tmp, lid); } } static __cpuinit void build_huge_update_entries(u32 **p, unsigned int pte, unsigned int tmp) { int small_sequence; /* * A huge PTE describes an area the size of the * configured huge page size. This is twice the * of the large TLB entry size we intend to use. * A TLB entry half the size of the configured * huge page size is configured into entrylo0 * and entrylo1 to cover the contiguous huge PTE * address space. */ small_sequence = (HPAGE_SIZE >> 7) < 0x10000; /* We can clobber tmp. It isn't used after this.*/ if (!small_sequence) uasm_i_lui(p, tmp, HPAGE_SIZE >> (7 + 16)); build_convert_pte_to_entrylo(p, pte); UASM_i_MTC0(p, pte, C0_ENTRYLO0); /* load it */ /* convert to entrylo1 */ if (small_sequence) UASM_i_ADDIU(p, pte, pte, HPAGE_SIZE >> 7); else UASM_i_ADDU(p, pte, pte, tmp); UASM_i_MTC0(p, pte, C0_ENTRYLO1); /* load it */ } static __cpuinit void build_huge_handler_tail(u32 **p, struct uasm_reloc **r, struct uasm_label **l, unsigned int pte, unsigned int ptr) { #ifdef CONFIG_SMP UASM_i_SC(p, pte, 0, ptr); uasm_il_beqz(p, r, pte, label_tlb_huge_update); UASM_i_LW(p, pte, 0, ptr); /* Needed because SC killed our PTE */ #else UASM_i_SW(p, pte, 0, ptr); #endif build_huge_update_entries(p, pte, ptr); build_huge_tlb_write_entry(p, l, r, pte, tlb_indexed); } #endif /* CONFIG_HUGETLB_PAGE */ #ifdef CONFIG_64BIT /* * TMP and PTR are scratch. * TMP will be clobbered, PTR will hold the pmd entry. */ static void __cpuinit build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r, unsigned int tmp, unsigned int ptr) { #ifndef CONFIG_MIPS_PGD_C0_CONTEXT long pgdc = (long)pgd_current; #endif /* * The vmalloc handling is not in the hotpath. */ uasm_i_dmfc0(p, tmp, C0_BADVADDR); if (check_for_high_segbits) { /* * The kernel currently implicitely assumes that the * MIPS SEGBITS parameter for the processor is * (PGDIR_SHIFT+PGDIR_BITS) or less, and will never * allocate virtual addresses outside the maximum * range for SEGBITS = (PGDIR_SHIFT+PGDIR_BITS). But * that doesn't prevent user code from accessing the * higher xuseg addresses. Here, we make sure that * everything but the lower xuseg addresses goes down * the module_alloc/vmalloc path. */ uasm_i_dsrl_safe(p, ptr, tmp, PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3); uasm_il_bnez(p, r, ptr, label_vmalloc); } else { uasm_il_bltz(p, r, tmp, label_vmalloc); } /* No uasm_i_nop needed here, since the next insn doesn't touch TMP. */ #ifdef CONFIG_MIPS_PGD_C0_CONTEXT if (pgd_reg != -1) { /* pgd is in pgd_reg */ UASM_i_MFC0(p, ptr, 31, pgd_reg); } else { /* * &pgd << 11 stored in CONTEXT [23..63]. */ UASM_i_MFC0(p, ptr, C0_CONTEXT); /* Clear lower 23 bits of context. */ uasm_i_dins(p, ptr, 0, 0, 23); /* 1 0 1 0 1 << 6 xkphys cached */ uasm_i_ori(p, ptr, ptr, 0x540); uasm_i_drotr(p, ptr, ptr, 11); } #elif defined(CONFIG_SMP) # ifdef CONFIG_MIPS_MT_SMTC /* * SMTC uses TCBind value as "CPU" index */ uasm_i_mfc0(p, ptr, C0_TCBIND); uasm_i_dsrl_safe(p, ptr, ptr, 19); # else /* * 64 bit SMP running in XKPHYS has smp_processor_id() << 3 * stored in CONTEXT. */ uasm_i_dmfc0(p, ptr, C0_CONTEXT); uasm_i_dsrl_safe(p, ptr, ptr, 23); # endif UASM_i_LA_mostly(p, tmp, pgdc); uasm_i_daddu(p, ptr, ptr, tmp); uasm_i_dmfc0(p, tmp, C0_BADVADDR); uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr); #else UASM_i_LA_mostly(p, ptr, pgdc); uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr); #endif uasm_l_vmalloc_done(l, *p); /* get pgd offset in bytes */ uasm_i_dsrl_safe(p, tmp, tmp, PGDIR_SHIFT - 3); uasm_i_andi(p, tmp, tmp, (PTRS_PER_PGD - 1)<<3); uasm_i_daddu(p, ptr, ptr, tmp); /* add in pgd offset */ #ifndef __PAGETABLE_PMD_FOLDED uasm_i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */ uasm_i_ld(p, ptr, 0, ptr); /* get pmd pointer */ uasm_i_dsrl_safe(p, tmp, tmp, PMD_SHIFT-3); /* get pmd offset in bytes */ uasm_i_andi(p, tmp, tmp, (PTRS_PER_PMD - 1)<<3); uasm_i_daddu(p, ptr, ptr, tmp); /* add in pmd offset */ #endif } enum vmalloc64_mode {not_refill, refill}; /* * BVADDR is the faulting address, PTR is scratch. * PTR will hold the pgd for vmalloc. */ static void __cpuinit build_get_pgd_vmalloc64(u32 **p, struct uasm_label **l, struct uasm_reloc **r, unsigned int bvaddr, unsigned int ptr, enum vmalloc64_mode mode) { long swpd = (long)swapper_pg_dir; int single_insn_swpd; int did_vmalloc_branch = 0; single_insn_swpd = uasm_in_compat_space_p(swpd) && !uasm_rel_lo(swpd); uasm_l_vmalloc(l, *p); if (mode == refill && check_for_high_segbits) { if (single_insn_swpd) { uasm_il_bltz(p, r, bvaddr, label_vmalloc_done); uasm_i_lui(p, ptr, uasm_rel_hi(swpd)); did_vmalloc_branch = 1; /* fall through */ } else { uasm_il_bgez(p, r, bvaddr, label_large_segbits_fault); } } if (!did_vmalloc_branch) { if (uasm_in_compat_space_p(swpd) && !uasm_rel_lo(swpd)) { uasm_il_b(p, r, label_vmalloc_done); uasm_i_lui(p, ptr, uasm_rel_hi(swpd)); } else { UASM_i_LA_mostly(p, ptr, swpd); uasm_il_b(p, r, label_vmalloc_done); if (uasm_in_compat_space_p(swpd)) uasm_i_addiu(p, ptr, ptr, uasm_rel_lo(swpd)); else uasm_i_daddiu(p, ptr, ptr, uasm_rel_lo(swpd)); } } if (mode == refill && check_for_high_segbits) { uasm_l_large_segbits_fault(l, *p); /* * We get here if we are an xsseg address, or if we are * an xuseg address above (PGDIR_SHIFT+PGDIR_BITS) boundary. * * Ignoring xsseg (assume disabled so would generate * (address errors?), the only remaining possibility * is the upper xuseg addresses. On processors with * TLB_SEGBITS <= PGDIR_SHIFT+PGDIR_BITS, these * addresses would have taken an address error. We try * to mimic that here by taking a load/istream page * fault. */ UASM_i_LA(p, ptr, (unsigned long)tlb_do_page_fault_0); uasm_i_jr(p, ptr); uasm_i_nop(p); } } #else /* !CONFIG_64BIT */ /* * TMP and PTR are scratch. * TMP will be clobbered, PTR will hold the pgd entry. */ static void __cpuinit __maybe_unused build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr) { long pgdc = (long)pgd_current; /* 32 bit SMP has smp_processor_id() stored in CONTEXT. */ #ifdef CONFIG_SMP #ifdef CONFIG_MIPS_MT_SMTC /* * SMTC uses TCBind value as "CPU" index */ uasm_i_mfc0(p, ptr, C0_TCBIND); UASM_i_LA_mostly(p, tmp, pgdc); uasm_i_srl(p, ptr, ptr, 19); #else /* * smp_processor_id() << 3 is stored in CONTEXT. */ uasm_i_mfc0(p, ptr, C0_CONTEXT); UASM_i_LA_mostly(p, tmp, pgdc); uasm_i_srl(p, ptr, ptr, 23); #endif uasm_i_addu(p, ptr, tmp, ptr); #else UASM_i_LA_mostly(p, ptr, pgdc); #endif uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */ uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr); uasm_i_srl(p, tmp, tmp, PGDIR_SHIFT); /* get pgd only bits */ uasm_i_sll(p, tmp, tmp, PGD_T_LOG2); uasm_i_addu(p, ptr, ptr, tmp); /* add in pgd offset */ } #endif /* !CONFIG_64BIT */ static void __cpuinit build_adjust_context(u32 **p, unsigned int ctx) { unsigned int shift = 4 - (PTE_T_LOG2 + 1) + PAGE_SHIFT - 12; unsigned int mask = (PTRS_PER_PTE / 2 - 1) << (PTE_T_LOG2 + 1); switch (current_cpu_type()) { case CPU_VR41XX: case CPU_VR4111: case CPU_VR4121: case CPU_VR4122: case CPU_VR4131: case CPU_VR4181: case CPU_VR4181A: case CPU_VR4133: shift += 2; break; default: break; } if (shift) UASM_i_SRL(p, ctx, ctx, shift); uasm_i_andi(p, ctx, ctx, mask); } static void __cpuinit build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr) { /* * Bug workaround for the Nevada. It seems as if under certain * circumstances the move from cp0_context might produce a * bogus result when the mfc0 instruction and its consumer are * in a different cacheline or a load instruction, probably any * memory reference, is between them. */ switch (current_cpu_type()) { case CPU_NEVADA: UASM_i_LW(p, ptr, 0, ptr); GET_CONTEXT(p, tmp); /* get context reg */ break; default: GET_CONTEXT(p, tmp); /* get context reg */ UASM_i_LW(p, ptr, 0, ptr); break; } build_adjust_context(p, tmp); UASM_i_ADDU(p, ptr, ptr, tmp); /* add in offset */ } static void __cpuinit build_update_entries(u32 **p, unsigned int tmp, unsigned int ptep) { /* * 64bit address support (36bit on a 32bit CPU) in a 32bit * Kernel is a special case. Only a few CPUs use it. */ #ifdef CONFIG_64BIT_PHYS_ADDR if (cpu_has_64bits) { uasm_i_ld(p, tmp, 0, ptep); /* get even pte */ uasm_i_ld(p, ptep, sizeof(pte_t), ptep); /* get odd pte */ if (kernel_uses_smartmips_rixi) { UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_NO_EXEC)); UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_NO_EXEC)); UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */ UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); } else { uasm_i_dsrl_safe(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */ UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */ uasm_i_dsrl_safe(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */ } UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */ } else { int pte_off_even = sizeof(pte_t) / 2; int pte_off_odd = pte_off_even + sizeof(pte_t); /* The pte entries are pre-shifted */ uasm_i_lw(p, tmp, pte_off_even, ptep); /* get even pte */ UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */ uasm_i_lw(p, ptep, pte_off_odd, ptep); /* get odd pte */ UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */ } #else UASM_i_LW(p, tmp, 0, ptep); /* get even pte */ UASM_i_LW(p, ptep, sizeof(pte_t), ptep); /* get odd pte */ if (r45k_bvahwbug()) build_tlb_probe_entry(p); if (kernel_uses_smartmips_rixi) { UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_NO_EXEC)); UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_NO_EXEC)); UASM_i_ROTR(p, tmp, tmp, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); if (r4k_250MHZhwbug()) UASM_i_MTC0(p, 0, C0_ENTRYLO0); UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */ UASM_i_ROTR(p, ptep, ptep, ilog2(_PAGE_GLOBAL) - ilog2(_PAGE_NO_EXEC)); } else { UASM_i_SRL(p, tmp, tmp, ilog2(_PAGE_GLOBAL)); /* convert to entrylo0 */ if (r4k_250MHZhwbug()) UASM_i_MTC0(p, 0, C0_ENTRYLO0); UASM_i_MTC0(p, tmp, C0_ENTRYLO0); /* load it */ UASM_i_SRL(p, ptep, ptep, ilog2(_PAGE_GLOBAL)); /* convert to entrylo1 */ if (r45k_bvahwbug()) uasm_i_mfc0(p, tmp, C0_INDEX); } if (r4k_250MHZhwbug()) UASM_i_MTC0(p, 0, C0_ENTRYLO1); UASM_i_MTC0(p, ptep, C0_ENTRYLO1); /* load it */ #endif } /* * For a 64-bit kernel, we are using the 64-bit XTLB refill exception * because EXL == 0. If we wrap, we can also use the 32 instruction * slots before the XTLB refill exception handler which belong to the * unused TLB refill exception. */ #define MIPS64_REFILL_INSNS 32 static void __cpuinit build_r4000_tlb_refill_handler(void) { u32 *p = tlb_handler; struct uasm_label *l = labels; struct uasm_reloc *r = relocs; u32 *f; unsigned int final_len; memset(tlb_handler, 0, sizeof(tlb_handler)); memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); memset(final_handler, 0, sizeof(final_handler)); /* * create the plain linear handler */ if (bcm1250_m3_war()) { unsigned int segbits = 44; uasm_i_dmfc0(&p, K0, C0_BADVADDR); uasm_i_dmfc0(&p, K1, C0_ENTRYHI); uasm_i_xor(&p, K0, K0, K1); uasm_i_dsrl_safe(&p, K1, K0, 62); uasm_i_dsrl_safe(&p, K0, K0, 12 + 1); uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits); uasm_i_or(&p, K0, K0, K1); uasm_il_bnez(&p, &r, K0, label_leave); /* No need for uasm_i_nop */ } #ifdef CONFIG_64BIT build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */ #else build_get_pgde32(&p, K0, K1); /* get pgd in K1 */ #endif #ifdef CONFIG_HUGETLB_PAGE build_is_huge_pte(&p, &r, K0, K1, label_tlb_huge_update); #endif build_get_ptep(&p, K0, K1); build_update_entries(&p, K0, K1); build_tlb_write_entry(&p, &l, &r, tlb_random); uasm_l_leave(&l, p); uasm_i_eret(&p); /* return from trap */ #ifdef CONFIG_HUGETLB_PAGE uasm_l_tlb_huge_update(&l, p); UASM_i_LW(&p, K0, 0, K1); build_huge_update_entries(&p, K0, K1); build_huge_tlb_write_entry(&p, &l, &r, K0, tlb_random); #endif #ifdef CONFIG_64BIT build_get_pgd_vmalloc64(&p, &l, &r, K0, K1, refill); #endif /* * Overflow check: For the 64bit handler, we need at least one * free instruction slot for the wrap-around branch. In worst * case, if the intended insertion point is a delay slot, we * need three, with the second nop'ed and the third being * unused. */ /* Loongson2 ebase is different than r4k, we have more space */ #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2) if ((p - tlb_handler) > 64) panic("TLB refill handler space exceeded"); #else if (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 1) || (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 3) && uasm_insn_has_bdelay(relocs, tlb_handler + MIPS64_REFILL_INSNS - 3))) panic("TLB refill handler space exceeded"); #endif /* * Now fold the handler in the TLB refill handler space. */ #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2) f = final_handler; /* Simplest case, just copy the handler. */ uasm_copy_handler(relocs, labels, tlb_handler, p, f); final_len = p - tlb_handler; #else /* CONFIG_64BIT */ f = final_handler + MIPS64_REFILL_INSNS; if ((p - tlb_handler) <= MIPS64_REFILL_INSNS) { /* Just copy the handler. */ uasm_copy_handler(relocs, labels, tlb_handler, p, f); final_len = p - tlb_handler; } else { #if defined(CONFIG_HUGETLB_PAGE) const enum label_id ls = label_tlb_huge_update; #else const enum label_id ls = label_vmalloc; #endif u32 *split; int ov = 0; int i; for (i = 0; i < ARRAY_SIZE(labels) && labels[i].lab != ls; i++) ; BUG_ON(i == ARRAY_SIZE(labels)); split = labels[i].addr; /* * See if we have overflown one way or the other. */ if (split > tlb_handler + MIPS64_REFILL_INSNS || split < p - MIPS64_REFILL_INSNS) ov = 1; if (ov) { /* * Split two instructions before the end. One * for the branch and one for the instruction * in the delay slot. */ split = tlb_handler + MIPS64_REFILL_INSNS - 2; /* * If the branch would fall in a delay slot, * we must back up an additional instruction * so that it is no longer in a delay slot. */ if (uasm_insn_has_bdelay(relocs, split - 1)) split--; } /* Copy first part of the handler. */ uasm_copy_handler(relocs, labels, tlb_handler, split, f); f += split - tlb_handler; if (ov) { /* Insert branch. */ uasm_l_split(&l, final_handler); uasm_il_b(&f, &r, label_split); if (uasm_insn_has_bdelay(relocs, split)) uasm_i_nop(&f); else { uasm_copy_handler(relocs, labels, split, split + 1, f); uasm_move_labels(labels, f, f + 1, -1); f++; split++; } } /* Copy the rest of the handler. */ uasm_copy_handler(relocs, labels, split, p, final_handler); final_len = (f - (final_handler + MIPS64_REFILL_INSNS)) + (p - split); } #endif /* CONFIG_64BIT */ uasm_resolve_relocs(relocs, labels); pr_debug("Wrote TLB refill handler (%u instructions).\n", final_len); memcpy((void *)ebase, final_handler, 0x100); dump_handler((u32 *)ebase, 64); } /* * 128 instructions for the fastpath handler is generous and should * never be exceeded. */ #define FASTPATH_SIZE 128 u32 handle_tlbl[FASTPATH_SIZE] __cacheline_aligned; u32 handle_tlbs[FASTPATH_SIZE] __cacheline_aligned; u32 handle_tlbm[FASTPATH_SIZE] __cacheline_aligned; #ifdef CONFIG_MIPS_PGD_C0_CONTEXT u32 tlbmiss_handler_setup_pgd[16] __cacheline_aligned; static void __cpuinit build_r4000_setup_pgd(void) { const int a0 = 4; const int a1 = 5; u32 *p = tlbmiss_handler_setup_pgd; struct uasm_label *l = labels; struct uasm_reloc *r = relocs; memset(tlbmiss_handler_setup_pgd, 0, sizeof(tlbmiss_handler_setup_pgd)); memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); pgd_reg = allocate_kscratch(); if (pgd_reg == -1) { /* PGD << 11 in c0_Context */ /* * If it is a ckseg0 address, convert to a physical * address. Shifting right by 29 and adding 4 will * result in zero for these addresses. * */ UASM_i_SRA(&p, a1, a0, 29); UASM_i_ADDIU(&p, a1, a1, 4); uasm_il_bnez(&p, &r, a1, label_tlbl_goaround1); uasm_i_nop(&p); uasm_i_dinsm(&p, a0, 0, 29, 64 - 29); uasm_l_tlbl_goaround1(&l, p); UASM_i_SLL(&p, a0, a0, 11); uasm_i_jr(&p, 31); UASM_i_MTC0(&p, a0, C0_CONTEXT); } else { /* PGD in c0_KScratch */ uasm_i_jr(&p, 31); UASM_i_MTC0(&p, a0, 31, pgd_reg); } if (p - tlbmiss_handler_setup_pgd > ARRAY_SIZE(tlbmiss_handler_setup_pgd)) panic("tlbmiss_handler_setup_pgd space exceeded"); uasm_resolve_relocs(relocs, labels); pr_debug("Wrote tlbmiss_handler_setup_pgd (%u instructions).\n", (unsigned int)(p - tlbmiss_handler_setup_pgd)); dump_handler(tlbmiss_handler_setup_pgd, ARRAY_SIZE(tlbmiss_handler_setup_pgd)); } #endif static void __cpuinit iPTE_LW(u32 **p, unsigned int pte, unsigned int ptr) { #ifdef CONFIG_SMP # ifdef CONFIG_64BIT_PHYS_ADDR if (cpu_has_64bits) uasm_i_lld(p, pte, 0, ptr); else # endif UASM_i_LL(p, pte, 0, ptr); #else # ifdef CONFIG_64BIT_PHYS_ADDR if (cpu_has_64bits) uasm_i_ld(p, pte, 0, ptr); else # endif UASM_i_LW(p, pte, 0, ptr); #endif } static void __cpuinit iPTE_SW(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr, unsigned int mode) { #ifdef CONFIG_64BIT_PHYS_ADDR unsigned int hwmode = mode & (_PAGE_VALID | _PAGE_DIRTY); #endif uasm_i_ori(p, pte, pte, mode); #ifdef CONFIG_SMP # ifdef CONFIG_64BIT_PHYS_ADDR if (cpu_has_64bits) uasm_i_scd(p, pte, 0, ptr); else # endif UASM_i_SC(p, pte, 0, ptr); if (r10000_llsc_war()) uasm_il_beqzl(p, r, pte, label_smp_pgtable_change); else uasm_il_beqz(p, r, pte, label_smp_pgtable_change); # ifdef CONFIG_64BIT_PHYS_ADDR if (!cpu_has_64bits) { /* no uasm_i_nop needed */ uasm_i_ll(p, pte, sizeof(pte_t) / 2, ptr); uasm_i_ori(p, pte, pte, hwmode); uasm_i_sc(p, pte, sizeof(pte_t) / 2, ptr); uasm_il_beqz(p, r, pte, label_smp_pgtable_change); /* no uasm_i_nop needed */ uasm_i_lw(p, pte, 0, ptr); } else uasm_i_nop(p); # else uasm_i_nop(p); # endif #else # ifdef CONFIG_64BIT_PHYS_ADDR if (cpu_has_64bits) uasm_i_sd(p, pte, 0, ptr); else # endif UASM_i_SW(p, pte, 0, ptr); # ifdef CONFIG_64BIT_PHYS_ADDR if (!cpu_has_64bits) { uasm_i_lw(p, pte, sizeof(pte_t) / 2, ptr); uasm_i_ori(p, pte, pte, hwmode); uasm_i_sw(p, pte, sizeof(pte_t) / 2, ptr); uasm_i_lw(p, pte, 0, ptr); } # endif #endif } /* * Check if PTE is present, if not then jump to LABEL. PTR points to * the page table where this PTE is located, PTE will be re-loaded * with it's original value. */ static void __cpuinit build_pte_present(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr, enum label_id lid) { if (kernel_uses_smartmips_rixi) { if (use_bbit_insns()) { uasm_il_bbit0(p, r, pte, ilog2(_PAGE_PRESENT), lid); uasm_i_nop(p); } else { uasm_i_andi(p, pte, pte, _PAGE_PRESENT); uasm_il_beqz(p, r, pte, lid); iPTE_LW(p, pte, ptr); } } else { uasm_i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_READ); uasm_i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_READ); uasm_il_bnez(p, r, pte, lid); iPTE_LW(p, pte, ptr); } } /* Make PTE valid, store result in PTR. */ static void __cpuinit build_make_valid(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr) { unsigned int mode = _PAGE_VALID | _PAGE_ACCESSED; iPTE_SW(p, r, pte, ptr, mode); } /* * Check if PTE can be written to, if not branch to LABEL. Regardless * restore PTE with value from PTR when done. */ static void __cpuinit build_pte_writable(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr, enum label_id lid) { if (use_bbit_insns()) { uasm_il_bbit0(p, r, pte, ilog2(_PAGE_PRESENT), lid); uasm_i_nop(p); uasm_il_bbit0(p, r, pte, ilog2(_PAGE_WRITE), lid); uasm_i_nop(p); } else { uasm_i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE); uasm_i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE); uasm_il_bnez(p, r, pte, lid); iPTE_LW(p, pte, ptr); } } /* Make PTE writable, update software status bits as well, then store * at PTR. */ static void __cpuinit build_make_write(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr) { unsigned int mode = (_PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY); iPTE_SW(p, r, pte, ptr, mode); } /* * Check if PTE can be modified, if not branch to LABEL. Regardless * restore PTE with value from PTR when done. */ static void __cpuinit build_pte_modifiable(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr, enum label_id lid) { if (use_bbit_insns()) { uasm_il_bbit0(p, r, pte, ilog2(_PAGE_WRITE), lid); uasm_i_nop(p); } else { uasm_i_andi(p, pte, pte, _PAGE_WRITE); uasm_il_beqz(p, r, pte, lid); iPTE_LW(p, pte, ptr); } } #ifndef CONFIG_MIPS_PGD_C0_CONTEXT /* * R3000 style TLB load/store/modify handlers. */ /* * This places the pte into ENTRYLO0 and writes it with tlbwi. * Then it returns. */ static void __cpuinit build_r3000_pte_reload_tlbwi(u32 **p, unsigned int pte, unsigned int tmp) { uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */ uasm_i_mfc0(p, tmp, C0_EPC); /* cp0 delay */ uasm_i_tlbwi(p); uasm_i_jr(p, tmp); uasm_i_rfe(p); /* branch delay */ } /* * This places the pte into ENTRYLO0 and writes it with tlbwi * or tlbwr as appropriate. This is because the index register * may have the probe fail bit set as a result of a trap on a * kseg2 access, i.e. without refill. Then it returns. */ static void __cpuinit build_r3000_tlb_reload_write(u32 **p, struct uasm_label **l, struct uasm_reloc **r, unsigned int pte, unsigned int tmp) { uasm_i_mfc0(p, tmp, C0_INDEX); uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */ uasm_il_bltz(p, r, tmp, label_r3000_write_probe_fail); /* cp0 delay */ uasm_i_mfc0(p, tmp, C0_EPC); /* branch delay */ uasm_i_tlbwi(p); /* cp0 delay */ uasm_i_jr(p, tmp); uasm_i_rfe(p); /* branch delay */ uasm_l_r3000_write_probe_fail(l, *p); uasm_i_tlbwr(p); /* cp0 delay */ uasm_i_jr(p, tmp); uasm_i_rfe(p); /* branch delay */ } static void __cpuinit build_r3000_tlbchange_handler_head(u32 **p, unsigned int pte, unsigned int ptr) { long pgdc = (long)pgd_current; uasm_i_mfc0(p, pte, C0_BADVADDR); uasm_i_lui(p, ptr, uasm_rel_hi(pgdc)); /* cp0 delay */ uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr); uasm_i_srl(p, pte, pte, 22); /* load delay */ uasm_i_sll(p, pte, pte, 2); uasm_i_addu(p, ptr, ptr, pte); uasm_i_mfc0(p, pte, C0_CONTEXT); uasm_i_lw(p, ptr, 0, ptr); /* cp0 delay */ uasm_i_andi(p, pte, pte, 0xffc); /* load delay */ uasm_i_addu(p, ptr, ptr, pte); uasm_i_lw(p, pte, 0, ptr); uasm_i_tlbp(p); /* load delay */ } static void __cpuinit build_r3000_tlb_load_handler(void) { u32 *p = handle_tlbl; struct uasm_label *l = labels; struct uasm_reloc *r = relocs; memset(handle_tlbl, 0, sizeof(handle_tlbl)); memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); build_r3000_tlbchange_handler_head(&p, K0, K1); build_pte_present(&p, &r, K0, K1, label_nopage_tlbl); uasm_i_nop(&p); /* load delay */ build_make_valid(&p, &r, K0, K1); build_r3000_tlb_reload_write(&p, &l, &r, K0, K1); uasm_l_nopage_tlbl(&l, p); uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff); uasm_i_nop(&p); if ((p - handle_tlbl) > FASTPATH_SIZE) panic("TLB load handler fastpath space exceeded"); uasm_resolve_relocs(relocs, labels); pr_debug("Wrote TLB load handler fastpath (%u instructions).\n", (unsigned int)(p - handle_tlbl)); dump_handler(handle_tlbl, ARRAY_SIZE(handle_tlbl)); } static void __cpuinit build_r3000_tlb_store_handler(void) { u32 *p = handle_tlbs; struct uasm_label *l = labels; struct uasm_reloc *r = relocs; memset(handle_tlbs, 0, sizeof(handle_tlbs)); memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); build_r3000_tlbchange_handler_head(&p, K0, K1); build_pte_writable(&p, &r, K0, K1, label_nopage_tlbs); uasm_i_nop(&p); /* load delay */ build_make_write(&p, &r, K0, K1); build_r3000_tlb_reload_write(&p, &l, &r, K0, K1); uasm_l_nopage_tlbs(&l, p); uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); uasm_i_nop(&p); if ((p - handle_tlbs) > FASTPATH_SIZE) panic("TLB store handler fastpath space exceeded"); uasm_resolve_relocs(relocs, labels); pr_debug("Wrote TLB store handler fastpath (%u instructions).\n", (unsigned int)(p - handle_tlbs)); dump_handler(handle_tlbs, ARRAY_SIZE(handle_tlbs)); } static void __cpuinit build_r3000_tlb_modify_handler(void) { u32 *p = handle_tlbm; struct uasm_label *l = labels; struct uasm_reloc *r = relocs; memset(handle_tlbm, 0, sizeof(handle_tlbm)); memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); build_r3000_tlbchange_handler_head(&p, K0, K1); build_pte_modifiable(&p, &r, K0, K1, label_nopage_tlbm); uasm_i_nop(&p); /* load delay */ build_make_write(&p, &r, K0, K1); build_r3000_pte_reload_tlbwi(&p, K0, K1); uasm_l_nopage_tlbm(&l, p); uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); uasm_i_nop(&p); if ((p - handle_tlbm) > FASTPATH_SIZE) panic("TLB modify handler fastpath space exceeded"); uasm_resolve_relocs(relocs, labels); pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n", (unsigned int)(p - handle_tlbm)); dump_handler(handle_tlbm, ARRAY_SIZE(handle_tlbm)); } #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */ /* * R4000 style TLB load/store/modify handlers. */ static void __cpuinit build_r4000_tlbchange_handler_head(u32 **p, struct uasm_label **l, struct uasm_reloc **r, unsigned int pte, unsigned int ptr) { #ifdef CONFIG_64BIT build_get_pmde64(p, l, r, pte, ptr); /* get pmd in ptr */ #else build_get_pgde32(p, pte, ptr); /* get pgd in ptr */ #endif #ifdef CONFIG_HUGETLB_PAGE /* * For huge tlb entries, pmd doesn't contain an address but * instead contains the tlb pte. Check the PAGE_HUGE bit and * see if we need to jump to huge tlb processing. */ build_is_huge_pte(p, r, pte, ptr, label_tlb_huge_update); #endif UASM_i_MFC0(p, pte, C0_BADVADDR); UASM_i_LW(p, ptr, 0, ptr); UASM_i_SRL(p, pte, pte, PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2); uasm_i_andi(p, pte, pte, (PTRS_PER_PTE - 1) << PTE_T_LOG2); UASM_i_ADDU(p, ptr, ptr, pte); #ifdef CONFIG_SMP uasm_l_smp_pgtable_change(l, *p); #endif iPTE_LW(p, pte, ptr); /* get even pte */ if (!m4kc_tlbp_war()) build_tlb_probe_entry(p); } static void __cpuinit build_r4000_tlbchange_handler_tail(u32 **p, struct uasm_label **l, struct uasm_reloc **r, unsigned int tmp, unsigned int ptr) { uasm_i_ori(p, ptr, ptr, sizeof(pte_t)); uasm_i_xori(p, ptr, ptr, sizeof(pte_t)); build_update_entries(p, tmp, ptr); build_tlb_write_entry(p, l, r, tlb_indexed); uasm_l_leave(l, *p); uasm_i_eret(p); /* return from trap */ #ifdef CONFIG_64BIT build_get_pgd_vmalloc64(p, l, r, tmp, ptr, not_refill); #endif } static void __cpuinit build_r4000_tlb_load_handler(void) { u32 *p = handle_tlbl; struct uasm_label *l = labels; struct uasm_reloc *r = relocs; memset(handle_tlbl, 0, sizeof(handle_tlbl)); memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); if (bcm1250_m3_war()) { unsigned int segbits = 44; uasm_i_dmfc0(&p, K0, C0_BADVADDR); uasm_i_dmfc0(&p, K1, C0_ENTRYHI); uasm_i_xor(&p, K0, K0, K1); uasm_i_dsrl_safe(&p, K1, K0, 62); uasm_i_dsrl_safe(&p, K0, K0, 12 + 1); uasm_i_dsll_safe(&p, K0, K0, 64 + 12 + 1 - segbits); uasm_i_or(&p, K0, K0, K1); uasm_il_bnez(&p, &r, K0, label_leave); /* No need for uasm_i_nop */ } build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1); build_pte_present(&p, &r, K0, K1, label_nopage_tlbl); if (m4kc_tlbp_war()) build_tlb_probe_entry(&p); if (kernel_uses_smartmips_rixi) { /* * If the page is not _PAGE_VALID, RI or XI could not * have triggered it. Skip the expensive test.. */ if (use_bbit_insns()) { uasm_il_bbit0(&p, &r, K0, ilog2(_PAGE_VALID), label_tlbl_goaround1); } else { uasm_i_andi(&p, K0, K0, _PAGE_VALID); uasm_il_beqz(&p, &r, K0, label_tlbl_goaround1); } uasm_i_nop(&p); uasm_i_tlbr(&p); /* Examine entrylo 0 or 1 based on ptr. */ if (use_bbit_insns()) { uasm_i_bbit0(&p, K1, ilog2(sizeof(pte_t)), 8); } else { uasm_i_andi(&p, K0, K1, sizeof(pte_t)); uasm_i_beqz(&p, K0, 8); } UASM_i_MFC0(&p, K0, C0_ENTRYLO0); /* load it in the delay slot*/ UASM_i_MFC0(&p, K0, C0_ENTRYLO1); /* load it if ptr is odd */ /* * If the entryLo (now in K0) is valid (bit 1), RI or * XI must have triggered it. */ if (use_bbit_insns()) { uasm_il_bbit1(&p, &r, K0, 1, label_nopage_tlbl); /* Reload the PTE value */ iPTE_LW(&p, K0, K1); uasm_l_tlbl_goaround1(&l, p); } else { uasm_i_andi(&p, K0, K0, 2); uasm_il_bnez(&p, &r, K0, label_nopage_tlbl); uasm_l_tlbl_goaround1(&l, p); /* Reload the PTE value */ iPTE_LW(&p, K0, K1); } } build_make_valid(&p, &r, K0, K1); build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1); #ifdef CONFIG_HUGETLB_PAGE /* * This is the entry point when build_r4000_tlbchange_handler_head * spots a huge page. */ uasm_l_tlb_huge_update(&l, p); iPTE_LW(&p, K0, K1); build_pte_present(&p, &r, K0, K1, label_nopage_tlbl); build_tlb_probe_entry(&p); if (kernel_uses_smartmips_rixi) { /* * If the page is not _PAGE_VALID, RI or XI could not * have triggered it. Skip the expensive test.. */ if (use_bbit_insns()) { uasm_il_bbit0(&p, &r, K0, ilog2(_PAGE_VALID), label_tlbl_goaround2); } else { uasm_i_andi(&p, K0, K0, _PAGE_VALID); uasm_il_beqz(&p, &r, K0, label_tlbl_goaround2); } uasm_i_nop(&p); uasm_i_tlbr(&p); /* Examine entrylo 0 or 1 based on ptr. */ if (use_bbit_insns()) { uasm_i_bbit0(&p, K1, ilog2(sizeof(pte_t)), 8); } else { uasm_i_andi(&p, K0, K1, sizeof(pte_t)); uasm_i_beqz(&p, K0, 8); } UASM_i_MFC0(&p, K0, C0_ENTRYLO0); /* load it in the delay slot*/ UASM_i_MFC0(&p, K0, C0_ENTRYLO1); /* load it if ptr is odd */ /* * If the entryLo (now in K0) is valid (bit 1), RI or * XI must have triggered it. */ if (use_bbit_insns()) { uasm_il_bbit0(&p, &r, K0, 1, label_tlbl_goaround2); } else { uasm_i_andi(&p, K0, K0, 2); uasm_il_beqz(&p, &r, K0, label_tlbl_goaround2); } /* Reload the PTE value */ iPTE_LW(&p, K0, K1); /* * We clobbered C0_PAGEMASK, restore it. On the other branch * it is restored in build_huge_tlb_write_entry. */ build_restore_pagemask(&p, &r, K0, label_nopage_tlbl); uasm_l_tlbl_goaround2(&l, p); } uasm_i_ori(&p, K0, K0, (_PAGE_ACCESSED | _PAGE_VALID)); build_huge_handler_tail(&p, &r, &l, K0, K1); #endif uasm_l_nopage_tlbl(&l, p); uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff); uasm_i_nop(&p); if ((p - handle_tlbl) > FASTPATH_SIZE) panic("TLB load handler fastpath space exceeded"); uasm_resolve_relocs(relocs, labels); pr_debug("Wrote TLB load handler fastpath (%u instructions).\n", (unsigned int)(p - handle_tlbl)); dump_handler(handle_tlbl, ARRAY_SIZE(handle_tlbl)); } static void __cpuinit build_r4000_tlb_store_handler(void) { u32 *p = handle_tlbs; struct uasm_label *l = labels; struct uasm_reloc *r = relocs; memset(handle_tlbs, 0, sizeof(handle_tlbs)); memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1); build_pte_writable(&p, &r, K0, K1, label_nopage_tlbs); if (m4kc_tlbp_war()) build_tlb_probe_entry(&p); build_make_write(&p, &r, K0, K1); build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1); #ifdef CONFIG_HUGETLB_PAGE /* * This is the entry point when * build_r4000_tlbchange_handler_head spots a huge page. */ uasm_l_tlb_huge_update(&l, p); iPTE_LW(&p, K0, K1); build_pte_writable(&p, &r, K0, K1, label_nopage_tlbs); build_tlb_probe_entry(&p); uasm_i_ori(&p, K0, K0, _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY); build_huge_handler_tail(&p, &r, &l, K0, K1); #endif uasm_l_nopage_tlbs(&l, p); uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); uasm_i_nop(&p); if ((p - handle_tlbs) > FASTPATH_SIZE) panic("TLB store handler fastpath space exceeded"); uasm_resolve_relocs(relocs, labels); pr_debug("Wrote TLB store handler fastpath (%u instructions).\n", (unsigned int)(p - handle_tlbs)); dump_handler(handle_tlbs, ARRAY_SIZE(handle_tlbs)); } static void __cpuinit build_r4000_tlb_modify_handler(void) { u32 *p = handle_tlbm; struct uasm_label *l = labels; struct uasm_reloc *r = relocs; memset(handle_tlbm, 0, sizeof(handle_tlbm)); memset(labels, 0, sizeof(labels)); memset(relocs, 0, sizeof(relocs)); build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1); build_pte_modifiable(&p, &r, K0, K1, label_nopage_tlbm); if (m4kc_tlbp_war()) build_tlb_probe_entry(&p); /* Present and writable bits set, set accessed and dirty bits. */ build_make_write(&p, &r, K0, K1); build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1); #ifdef CONFIG_HUGETLB_PAGE /* * This is the entry point when * build_r4000_tlbchange_handler_head spots a huge page. */ uasm_l_tlb_huge_update(&l, p); iPTE_LW(&p, K0, K1); build_pte_modifiable(&p, &r, K0, K1, label_nopage_tlbm); build_tlb_probe_entry(&p); uasm_i_ori(&p, K0, K0, _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY); build_huge_handler_tail(&p, &r, &l, K0, K1); #endif uasm_l_nopage_tlbm(&l, p); uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); uasm_i_nop(&p); if ((p - handle_tlbm) > FASTPATH_SIZE) panic("TLB modify handler fastpath space exceeded"); uasm_resolve_relocs(relocs, labels); pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n", (unsigned int)(p - handle_tlbm)); dump_handler(handle_tlbm, ARRAY_SIZE(handle_tlbm)); } void __cpuinit build_tlb_refill_handler(void) { /* * The refill handler is generated per-CPU, multi-node systems * may have local storage for it. The other handlers are only * needed once. */ static int run_once = 0; #ifdef CONFIG_64BIT check_for_high_segbits = current_cpu_data.vmbits > (PGDIR_SHIFT + PGD_ORDER + PAGE_SHIFT - 3); #endif switch (current_cpu_type()) { case CPU_R2000: case CPU_R3000: case CPU_R3000A: case CPU_R3081E: case CPU_TX3912: case CPU_TX3922: case CPU_TX3927: #ifndef CONFIG_MIPS_PGD_C0_CONTEXT build_r3000_tlb_refill_handler(); if (!run_once) { build_r3000_tlb_load_handler(); build_r3000_tlb_store_handler(); build_r3000_tlb_modify_handler(); run_once++; } #else panic("No R3000 TLB refill handler"); #endif break; case CPU_R6000: case CPU_R6000A: panic("No R6000 TLB refill handler yet"); break; case CPU_R8000: panic("No R8000 TLB refill handler yet"); break; default: if (!run_once) { #ifdef CONFIG_MIPS_PGD_C0_CONTEXT build_r4000_setup_pgd(); #endif build_r4000_tlb_load_handler(); build_r4000_tlb_store_handler(); build_r4000_tlb_modify_handler(); run_once++; } build_r4000_tlb_refill_handler(); } } void __cpuinit flush_tlb_handlers(void) { local_flush_icache_range((unsigned long)handle_tlbl, (unsigned long)handle_tlbl + sizeof(handle_tlbl)); local_flush_icache_range((unsigned long)handle_tlbs, (unsigned long)handle_tlbs + sizeof(handle_tlbs)); local_flush_icache_range((unsigned long)handle_tlbm, (unsigned long)handle_tlbm + sizeof(handle_tlbm)); #ifdef CONFIG_MIPS_PGD_C0_CONTEXT local_flush_icache_range((unsigned long)tlbmiss_handler_setup_pgd, (unsigned long)tlbmiss_handler_setup_pgd + sizeof(handle_tlbm)); #endif }