1 // SPDX-License-Identifier: GPL-2.0
3 * Dump R4x00 TLB for debugging purposes.
5 * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.
6 * Copyright (C) 1999 by Silicon Graphics, Inc.
8 #include <linux/kernel.h>
11 #include <asm/hazards.h>
12 #include <asm/mipsregs.h>
13 #include <asm/mmu_context.h>
15 #include <asm/tlbdebug.h>
17 void dump_tlb_regs(void)
19 const int field = 2 * sizeof(unsigned long);
21 pr_info("Index : %0x\n", read_c0_index());
22 pr_info("PageMask : %0x\n", read_c0_pagemask());
24 pr_info("GuestCtl1: %0x\n", read_c0_guestctl1());
25 pr_info("EntryHi : %0*lx\n", field, read_c0_entryhi());
26 pr_info("EntryLo0 : %0*lx\n", field, read_c0_entrylo0());
27 pr_info("EntryLo1 : %0*lx\n", field, read_c0_entrylo1());
28 pr_info("Wired : %0x\n", read_c0_wired());
29 switch (current_cpu_type()) {
34 pr_info("FrameMask: %0x\n", read_c0_framemask());
37 if (cpu_has_small_pages || cpu_has_rixi || cpu_has_xpa)
38 pr_info("PageGrain: %0x\n", read_c0_pagegrain());
40 pr_info("PWField : %0*lx\n", field, read_c0_pwfield());
41 pr_info("PWSize : %0*lx\n", field, read_c0_pwsize());
42 pr_info("PWCtl : %0x\n", read_c0_pwctl());
46 static inline const char *msk2str(unsigned int mask)
49 case PM_4K: return "4kb";
50 case PM_16K: return "16kb";
51 case PM_64K: return "64kb";
52 case PM_256K: return "256kb";
53 #ifdef CONFIG_CPU_CAVIUM_OCTEON
54 case PM_8K: return "8kb";
55 case PM_32K: return "32kb";
56 case PM_128K: return "128kb";
57 case PM_512K: return "512kb";
58 case PM_2M: return "2Mb";
59 case PM_8M: return "8Mb";
60 case PM_32M: return "32Mb";
62 #ifndef CONFIG_CPU_VR41XX
63 case PM_1M: return "1Mb";
64 case PM_4M: return "4Mb";
65 case PM_16M: return "16Mb";
66 case PM_64M: return "64Mb";
67 case PM_256M: return "256Mb";
68 case PM_1G: return "1Gb";
74 static void dump_tlb(int first, int last)
76 unsigned long s_entryhi, entryhi, asid, mmid;
77 unsigned long long entrylo0, entrylo1, pa;
78 unsigned int s_index, s_pagemask, s_guestctl1 = 0;
79 unsigned int pagemask, guestctl1 = 0, c0, c1, i;
80 unsigned long asidmask = cpu_asid_mask(¤t_cpu_data);
81 int asidwidth = DIV_ROUND_UP(ilog2(asidmask) + 1, 4);
84 bool xpa = cpu_has_xpa && (read_c0_pagegrain() & PG_ELPA);
85 int pwidth = xpa ? 11 : 8;
93 s_pagemask = read_c0_pagemask();
94 s_entryhi = read_c0_entryhi();
95 s_index = read_c0_index();
98 asid = s_mmid = read_c0_memorymapid();
100 asid = s_entryhi & asidmask;
103 s_guestctl1 = read_c0_guestctl1();
105 for (i = first; i <= last; i++) {
110 pagemask = read_c0_pagemask();
111 entryhi = read_c0_entryhi();
112 entrylo0 = read_c0_entrylo0();
113 entrylo1 = read_c0_entrylo1();
116 mmid = read_c0_memorymapid();
118 mmid = entryhi & asidmask;
121 guestctl1 = read_c0_guestctl1();
123 /* EHINV bit marks entire entry as invalid */
124 if (cpu_has_tlbinv && entryhi & MIPS_ENTRYHI_EHINV)
127 * Prior to tlbinv, unused entries have a virtual address of
130 if ((entryhi & ~0x1ffffUL) == CKSEG0)
133 * ASID takes effect in absence of G (global) bit.
134 * We check both G bits, even though architecturally they should
135 * match one another, because some revisions of the SB1 core may
136 * leave only a single G bit set after a machine check exception
137 * due to duplicate TLB entry.
139 if (!((entrylo0 | entrylo1) & ENTRYLO_G) && (mmid != asid))
143 * Only print entries in use
145 printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));
147 c0 = (entrylo0 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
148 c1 = (entrylo1 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
150 pr_cont("va=%0*lx asid=%0*lx",
151 vwidth, (entryhi & ~0x1fffUL),
154 pr_cont(" gid=%02lx",
155 (guestctl1 & MIPS_GCTL1_RID)
156 >> MIPS_GCTL1_RID_SHIFT);
157 /* RI/XI are in awkward places, so mask them off separately */
158 pa = entrylo0 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI);
160 pa |= (unsigned long long)readx_c0_entrylo0() << 30;
161 pa = (pa << 6) & PAGE_MASK;
164 pr_cont("ri=%d xi=%d ",
165 (entrylo0 & MIPS_ENTRYLO_RI) ? 1 : 0,
166 (entrylo0 & MIPS_ENTRYLO_XI) ? 1 : 0);
167 pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d] [",
169 (entrylo0 & ENTRYLO_D) ? 1 : 0,
170 (entrylo0 & ENTRYLO_V) ? 1 : 0,
171 (entrylo0 & ENTRYLO_G) ? 1 : 0);
172 /* RI/XI are in awkward places, so mask them off separately */
173 pa = entrylo1 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI);
175 pa |= (unsigned long long)readx_c0_entrylo1() << 30;
176 pa = (pa << 6) & PAGE_MASK;
178 pr_cont("ri=%d xi=%d ",
179 (entrylo1 & MIPS_ENTRYLO_RI) ? 1 : 0,
180 (entrylo1 & MIPS_ENTRYLO_XI) ? 1 : 0);
181 pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d]\n",
183 (entrylo1 & ENTRYLO_D) ? 1 : 0,
184 (entrylo1 & ENTRYLO_V) ? 1 : 0,
185 (entrylo1 & ENTRYLO_G) ? 1 : 0);
189 write_c0_entryhi(s_entryhi);
190 write_c0_index(s_index);
191 write_c0_pagemask(s_pagemask);
193 write_c0_guestctl1(s_guestctl1);
196 void dump_tlb_all(void)
198 dump_tlb(0, current_cpu_data.tlbsize - 1);