1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SPARC_TRAP_BLOCK_H
3 #define _SPARC_TRAP_BLOCK_H
4
5 #include <linux/threads.h>
6
7 #include <asm/hypervisor.h>
8 #include <asm/asi.h>
9
10 #ifndef __ASSEMBLY__
11
12 /* Trap handling code needs to get at a few critical values upon
13 * trap entry and to process TSB misses. These cannot be in the
14 * per_cpu() area as we really need to lock them into the TLB and
15 * thus make them part of the main kernel image. As a result we
16 * try to make this as small as possible.
17 *
18 * This is padded out and aligned to 64-bytes to avoid false sharing
19 * on SMP.
20 */
21
22 /* If you modify the size of this structure, please update
23 * TRAP_BLOCK_SZ_SHIFT below.
24 */
25 struct thread_info;
26 struct trap_per_cpu {
27 /* D-cache line 1: Basic thread information, cpu and device mondo queues */
28 struct thread_info *thread;
29 unsigned long pgd_paddr;
30 unsigned long cpu_mondo_pa;
31 unsigned long dev_mondo_pa;
32
33 /* D-cache line 2: Error Mondo Queue and kernel buffer pointers */
34 unsigned long resum_mondo_pa;
35 unsigned long resum_kernel_buf_pa;
36 unsigned long nonresum_mondo_pa;
37 unsigned long nonresum_kernel_buf_pa;
38
39 /* Dcache lines 3, 4, 5, and 6: Hypervisor Fault Status */
40 struct hv_fault_status fault_info;
41
42 /* Dcache line 7: Physical addresses of CPU send mondo block and CPU list. */
43 unsigned long cpu_mondo_block_pa;
44 unsigned long cpu_list_pa;
45 unsigned long tsb_huge;
46 unsigned long tsb_huge_temp;
47
48 /* Dcache line 8: IRQ work list, and keep trap_block a power-of-2 in size. */
49 unsigned long irq_worklist_pa;
50 unsigned int cpu_mondo_qmask;
51 unsigned int dev_mondo_qmask;
52 unsigned int resum_qmask;
53 unsigned int nonresum_qmask;
54 unsigned long __per_cpu_base;
55 } __attribute__((aligned(64)));
56 extern struct trap_per_cpu trap_block[NR_CPUS];
57 void init_cur_cpu_trap(struct thread_info *);
58 void setup_tba(void);
59 extern int ncpus_probed;
60 extern u64 cpu_mondo_counter[NR_CPUS];
61
62 unsigned long real_hard_smp_processor_id(void);
63
64 struct cpuid_patch_entry {
65 unsigned int addr;
66 unsigned int cheetah_safari[4];
67 unsigned int cheetah_jbus[4];
68 unsigned int starfire[4];
69 unsigned int sun4v[4];
70 };
71 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
72
73 struct sun4v_1insn_patch_entry {
74 unsigned int addr;
75 unsigned int insn;
76 };
77 extern struct sun4v_1insn_patch_entry __sun4v_1insn_patch,
78 __sun4v_1insn_patch_end;
79 extern struct sun4v_1insn_patch_entry __fast_win_ctrl_1insn_patch,
80 __fast_win_ctrl_1insn_patch_end;
81 extern struct sun4v_1insn_patch_entry __sun_m7_1insn_patch,
82 __sun_m7_1insn_patch_end;
83
84 struct sun4v_2insn_patch_entry {
85 unsigned int addr;
86 unsigned int insns[2];
87 };
88 extern struct sun4v_2insn_patch_entry __sun4v_2insn_patch,
89 __sun4v_2insn_patch_end;
90 extern struct sun4v_2insn_patch_entry __sun_m7_2insn_patch,
91 __sun_m7_2insn_patch_end;
92
93
94 #endif /* !(__ASSEMBLY__) */
95
96 #define TRAP_PER_CPU_THREAD 0x00
97 #define TRAP_PER_CPU_PGD_PADDR 0x08
98 #define TRAP_PER_CPU_CPU_MONDO_PA 0x10
99 #define TRAP_PER_CPU_DEV_MONDO_PA 0x18
100 #define TRAP_PER_CPU_RESUM_MONDO_PA 0x20
101 #define TRAP_PER_CPU_RESUM_KBUF_PA 0x28
102 #define TRAP_PER_CPU_NONRESUM_MONDO_PA 0x30
103 #define TRAP_PER_CPU_NONRESUM_KBUF_PA 0x38
104 #define TRAP_PER_CPU_FAULT_INFO 0x40
105 #define TRAP_PER_CPU_CPU_MONDO_BLOCK_PA 0xc0
106 #define TRAP_PER_CPU_CPU_LIST_PA 0xc8
107 #define TRAP_PER_CPU_TSB_HUGE 0xd0
108 #define TRAP_PER_CPU_TSB_HUGE_TEMP 0xd8
109 #define TRAP_PER_CPU_IRQ_WORKLIST_PA 0xe0
110 #define TRAP_PER_CPU_CPU_MONDO_QMASK 0xe8
111 #define TRAP_PER_CPU_DEV_MONDO_QMASK 0xec
112 #define TRAP_PER_CPU_RESUM_QMASK 0xf0
113 #define TRAP_PER_CPU_NONRESUM_QMASK 0xf4
114 #define TRAP_PER_CPU_PER_CPU_BASE 0xf8
115
116 #define TRAP_BLOCK_SZ_SHIFT 8
117
118 #include <asm/scratchpad.h>
119
120 #define __GET_CPUID(REG) \
121 /* Spitfire implementation (default). */ \
122 661: ldxa [%g0] ASI_UPA_CONFIG, REG; \
123 srlx REG, 17, REG; \
124 and REG, 0x1f, REG; \
125 nop; \
126 .section .cpuid_patch, "ax"; \
127 /* Instruction location. */ \
128 .word 661b; \
129 /* Cheetah Safari implementation. */ \
130 ldxa [%g0] ASI_SAFARI_CONFIG, REG; \
131 srlx REG, 17, REG; \
132 and REG, 0x3ff, REG; \
133 nop; \
134 /* Cheetah JBUS implementation. */ \
135 ldxa [%g0] ASI_JBUS_CONFIG, REG; \
136 srlx REG, 17, REG; \
137 and REG, 0x1f, REG; \
138 nop; \
139 /* Starfire implementation. */ \
140 sethi %hi(0x1fff40000d0 >> 9), REG; \
141 sllx REG, 9, REG; \
142 or REG, 0xd0, REG; \
143 lduwa [REG] ASI_PHYS_BYPASS_EC_E, REG;\
144 /* sun4v implementation. */ \
145 mov SCRATCHPAD_CPUID, REG; \
146 ldxa [REG] ASI_SCRATCHPAD, REG; \
147 nop; \
148 nop; \
149 .previous;
150
151 #ifdef CONFIG_SMP
152
153 #define TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
154 __GET_CPUID(TMP) \
155 sethi %hi(trap_block), DEST; \
156 sllx TMP, TRAP_BLOCK_SZ_SHIFT, TMP; \
157 or DEST, %lo(trap_block), DEST; \
158 add DEST, TMP, DEST; \
159
160 /* Clobbers TMP, current address space PGD phys address into DEST. */
161 #define TRAP_LOAD_PGD_PHYS(DEST, TMP) \
162 TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
163 ldx [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
164
165 /* Clobbers TMP, loads local processor's IRQ work area into DEST. */
166 #define TRAP_LOAD_IRQ_WORK_PA(DEST, TMP) \
167 TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
168 add DEST, TRAP_PER_CPU_IRQ_WORKLIST_PA, DEST;
169
170 /* Clobbers TMP, loads DEST with current thread info pointer. */
171 #define TRAP_LOAD_THREAD_REG(DEST, TMP) \
172 TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
173 ldx [DEST + TRAP_PER_CPU_THREAD], DEST;
174
175 /* Given the current thread info pointer in THR, load the per-cpu
176 * area base of the current processor into DEST. REG1, REG2, and REG3 are
177 * clobbered.
178 *
179 * You absolutely cannot use DEST as a temporary in this code. The
180 * reason is that traps can happen during execution, and return from
181 * trap will load the fully resolved DEST per-cpu base. This can corrupt
182 * the calculations done by the macro mid-stream.
183 */
184 #define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3) \
185 lduh [THR + TI_CPU], REG1; \
186 sethi %hi(trap_block), REG2; \
187 sllx REG1, TRAP_BLOCK_SZ_SHIFT, REG1; \
188 or REG2, %lo(trap_block), REG2; \
189 add REG2, REG1, REG2; \
190 ldx [REG2 + TRAP_PER_CPU_PER_CPU_BASE], DEST;
191
192 #else
193
194 #define TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
195 sethi %hi(trap_block), DEST; \
196 or DEST, %lo(trap_block), DEST; \
197
198 /* Uniprocessor versions, we know the cpuid is zero. */
199 #define TRAP_LOAD_PGD_PHYS(DEST, TMP) \
200 TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
201 ldx [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
202
203 /* Clobbers TMP, loads local processor's IRQ work area into DEST. */
204 #define TRAP_LOAD_IRQ_WORK_PA(DEST, TMP) \
205 TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
206 add DEST, TRAP_PER_CPU_IRQ_WORKLIST_PA, DEST;
207
208 #define TRAP_LOAD_THREAD_REG(DEST, TMP) \
209 TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
210 ldx [DEST + TRAP_PER_CPU_THREAD], DEST;
211
212 /* No per-cpu areas on uniprocessor, so no need to load DEST. */
213 #define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3)
214
215 #endif /* !(CONFIG_SMP) */
216
217 #endif /* _SPARC_TRAP_BLOCK_H */
218
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