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12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <asm/asi.h>
15#include <asm/leon.h>
16#include <asm/tlbflush.h>
17
18#include "srmmu.h"
19
20int leon_flush_during_switch = 1;
21int srmmu_swprobe_trace;
22
23static inline unsigned long leon_get_ctable_ptr(void)
24{
25 unsigned int retval;
26
27 __asm__ __volatile__("lda [%1] %2, %0\n\t" :
28 "=r" (retval) :
29 "r" (SRMMU_CTXTBL_PTR),
30 "i" (ASI_LEON_MMUREGS));
31 return (retval & SRMMU_CTX_PMASK) << 4;
32}
33
34
35unsigned long leon_swprobe(unsigned long vaddr, unsigned long *paddr)
36{
37
38 unsigned int ctxtbl;
39 unsigned int pgd, pmd, ped;
40 unsigned int ptr;
41 unsigned int lvl, pte, paddrbase;
42 unsigned int ctx;
43 unsigned int paddr_calc;
44
45 paddrbase = 0;
46
47 if (srmmu_swprobe_trace)
48 printk(KERN_INFO "swprobe: trace on\n");
49
50 ctxtbl = leon_get_ctable_ptr();
51 if (!(ctxtbl)) {
52 if (srmmu_swprobe_trace)
53 printk(KERN_INFO "swprobe: leon_get_ctable_ptr returned 0=>0\n");
54 return 0;
55 }
56 if (!_pfn_valid(PFN(ctxtbl))) {
57 if (srmmu_swprobe_trace)
58 printk(KERN_INFO
59 "swprobe: !_pfn_valid(%x)=>0\n",
60 PFN(ctxtbl));
61 return 0;
62 }
63
64 ctx = srmmu_get_context();
65 if (srmmu_swprobe_trace)
66 printk(KERN_INFO "swprobe: --- ctx (%x) ---\n", ctx);
67
68 pgd = LEON_BYPASS_LOAD_PA(ctxtbl + (ctx * 4));
69
70 if (((pgd & SRMMU_ET_MASK) == SRMMU_ET_PTE)) {
71 if (srmmu_swprobe_trace)
72 printk(KERN_INFO "swprobe: pgd is entry level 3\n");
73 lvl = 3;
74 pte = pgd;
75 paddrbase = pgd & _SRMMU_PTE_PMASK_LEON;
76 goto ready;
77 }
78 if (((pgd & SRMMU_ET_MASK) != SRMMU_ET_PTD)) {
79 if (srmmu_swprobe_trace)
80 printk(KERN_INFO "swprobe: pgd is invalid => 0\n");
81 return 0;
82 }
83
84 if (srmmu_swprobe_trace)
85 printk(KERN_INFO "swprobe: --- pgd (%x) ---\n", pgd);
86
87 ptr = (pgd & SRMMU_PTD_PMASK) << 4;
88 ptr += ((((vaddr) >> LEON_PGD_SH) & LEON_PGD_M) * 4);
89 if (!_pfn_valid(PFN(ptr)))
90 return 0;
91
92 pmd = LEON_BYPASS_LOAD_PA(ptr);
93 if (((pmd & SRMMU_ET_MASK) == SRMMU_ET_PTE)) {
94 if (srmmu_swprobe_trace)
95 printk(KERN_INFO "swprobe: pmd is entry level 2\n");
96 lvl = 2;
97 pte = pmd;
98 paddrbase = pmd & _SRMMU_PTE_PMASK_LEON;
99 goto ready;
100 }
101 if (((pmd & SRMMU_ET_MASK) != SRMMU_ET_PTD)) {
102 if (srmmu_swprobe_trace)
103 printk(KERN_INFO "swprobe: pmd is invalid => 0\n");
104 return 0;
105 }
106
107 if (srmmu_swprobe_trace)
108 printk(KERN_INFO "swprobe: --- pmd (%x) ---\n", pmd);
109
110 ptr = (pmd & SRMMU_PTD_PMASK) << 4;
111 ptr += (((vaddr >> LEON_PMD_SH) & LEON_PMD_M) * 4);
112 if (!_pfn_valid(PFN(ptr))) {
113 if (srmmu_swprobe_trace)
114 printk(KERN_INFO "swprobe: !_pfn_valid(%x)=>0\n",
115 PFN(ptr));
116 return 0;
117 }
118
119 ped = LEON_BYPASS_LOAD_PA(ptr);
120
121 if (((ped & SRMMU_ET_MASK) == SRMMU_ET_PTE)) {
122 if (srmmu_swprobe_trace)
123 printk(KERN_INFO "swprobe: ped is entry level 1\n");
124 lvl = 1;
125 pte = ped;
126 paddrbase = ped & _SRMMU_PTE_PMASK_LEON;
127 goto ready;
128 }
129 if (((ped & SRMMU_ET_MASK) != SRMMU_ET_PTD)) {
130 if (srmmu_swprobe_trace)
131 printk(KERN_INFO "swprobe: ped is invalid => 0\n");
132 return 0;
133 }
134
135 if (srmmu_swprobe_trace)
136 printk(KERN_INFO "swprobe: --- ped (%x) ---\n", ped);
137
138 ptr = (ped & SRMMU_PTD_PMASK) << 4;
139 ptr += (((vaddr >> LEON_PTE_SH) & LEON_PTE_M) * 4);
140 if (!_pfn_valid(PFN(ptr)))
141 return 0;
142
143 ptr = LEON_BYPASS_LOAD_PA(ptr);
144 if (((ptr & SRMMU_ET_MASK) == SRMMU_ET_PTE)) {
145 if (srmmu_swprobe_trace)
146 printk(KERN_INFO "swprobe: ptr is entry level 0\n");
147 lvl = 0;
148 pte = ptr;
149 paddrbase = ptr & _SRMMU_PTE_PMASK_LEON;
150 goto ready;
151 }
152 if (srmmu_swprobe_trace)
153 printk(KERN_INFO "swprobe: ptr is invalid => 0\n");
154 return 0;
155
156ready:
157 switch (lvl) {
158 case 0:
159 paddr_calc =
160 (vaddr & ~(-1 << LEON_PTE_SH)) | ((pte & ~0xff) << 4);
161 break;
162 case 1:
163 paddr_calc =
164 (vaddr & ~(-1 << LEON_PMD_SH)) | ((pte & ~0xff) << 4);
165 break;
166 case 2:
167 paddr_calc =
168 (vaddr & ~(-1 << LEON_PGD_SH)) | ((pte & ~0xff) << 4);
169 break;
170 default:
171 case 3:
172 paddr_calc = vaddr;
173 break;
174 }
175 if (srmmu_swprobe_trace)
176 printk(KERN_INFO "swprobe: padde %x\n", paddr_calc);
177 if (paddr)
178 *paddr = paddr_calc;
179 return pte;
180}
181
182void leon_flush_icache_all(void)
183{
184 __asm__ __volatile__(" flush ");
185}
186
187void leon_flush_dcache_all(void)
188{
189 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t" : :
190 "i"(ASI_LEON_DFLUSH) : "memory");
191}
192
193void leon_flush_pcache_all(struct vm_area_struct *vma, unsigned long page)
194{
195 if (vma->vm_flags & VM_EXEC)
196 leon_flush_icache_all();
197 leon_flush_dcache_all();
198}
199
200void leon_flush_cache_all(void)
201{
202 __asm__ __volatile__(" flush ");
203 __asm__ __volatile__("sta %%g0, [%%g0] %0\n\t" : :
204 "i"(ASI_LEON_DFLUSH) : "memory");
205}
206
207void leon_flush_tlb_all(void)
208{
209 leon_flush_cache_all();
210 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : "r"(0x400),
211 "i"(ASI_LEON_MMUFLUSH) : "memory");
212}
213
214
215void leon3_getCacheRegs(struct leon3_cacheregs *regs)
216{
217 unsigned long ccr, iccr, dccr;
218
219 if (!regs)
220 return;
221
222 __asm__ __volatile__("lda [%%g0] %3, %0\n\t"
223 "mov 0x08, %%g1\n\t"
224 "lda [%%g1] %3, %1\n\t"
225 "mov 0x0c, %%g1\n\t"
226 "lda [%%g1] %3, %2\n\t"
227 : "=r"(ccr), "=r"(iccr), "=r"(dccr)
228
229 : "i"(ASI_LEON_CACHEREGS)
230 : "g1"
231 );
232 regs->ccr = ccr;
233 regs->iccr = iccr;
234 regs->dccr = dccr;
235}
236
237
238
239
240
241
242
243int __init leon_flush_needed(void)
244{
245 int flush_needed = -1;
246 unsigned int ssize, sets;
247 char *setStr[4] =
248 { "direct mapped", "2-way associative", "3-way associative",
249 "4-way associative"
250 };
251
252 struct leon3_cacheregs cregs;
253 leon3_getCacheRegs(&cregs);
254 sets = (cregs.dccr & LEON3_XCCR_SETS_MASK) >> 24;
255
256 ssize = 1 << ((cregs.dccr & LEON3_XCCR_SSIZE_MASK) >> 20);
257
258 printk(KERN_INFO "CACHE: %s cache, set size %dk\n",
259 sets > 3 ? "unknown" : setStr[sets], ssize);
260 if ((ssize <= (PAGE_SIZE / 1024)) && (sets == 0)) {
261
262
263 flush_needed = 0;
264 printk(KERN_INFO "CACHE: not flushing on every context switch\n");
265 }
266 return flush_needed;
267}
268
269void leon_switch_mm(void)
270{
271 flush_tlb_mm((void *)0);
272 if (leon_flush_during_switch)
273 leon_flush_cache_all();
274}
275
276static void leon_flush_cache_mm(struct mm_struct *mm)
277{
278 leon_flush_cache_all();
279}
280
281static void leon_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
282{
283 leon_flush_pcache_all(vma, page);
284}
285
286static void leon_flush_cache_range(struct vm_area_struct *vma,
287 unsigned long start,
288 unsigned long end)
289{
290 leon_flush_cache_all();
291}
292
293static void leon_flush_tlb_mm(struct mm_struct *mm)
294{
295 leon_flush_tlb_all();
296}
297
298static void leon_flush_tlb_page(struct vm_area_struct *vma,
299 unsigned long page)
300{
301 leon_flush_tlb_all();
302}
303
304static void leon_flush_tlb_range(struct vm_area_struct *vma,
305 unsigned long start,
306 unsigned long end)
307{
308 leon_flush_tlb_all();
309}
310
311static void leon_flush_page_to_ram(unsigned long page)
312{
313 leon_flush_cache_all();
314}
315
316static void leon_flush_sig_insns(struct mm_struct *mm, unsigned long page)
317{
318 leon_flush_cache_all();
319}
320
321static void leon_flush_page_for_dma(unsigned long page)
322{
323 leon_flush_dcache_all();
324}
325
326void __init poke_leonsparc(void)
327{
328}
329
330static const struct sparc32_cachetlb_ops leon_ops = {
331 .cache_all = leon_flush_cache_all,
332 .cache_mm = leon_flush_cache_mm,
333 .cache_page = leon_flush_cache_page,
334 .cache_range = leon_flush_cache_range,
335 .tlb_all = leon_flush_tlb_all,
336 .tlb_mm = leon_flush_tlb_mm,
337 .tlb_page = leon_flush_tlb_page,
338 .tlb_range = leon_flush_tlb_range,
339 .page_to_ram = leon_flush_page_to_ram,
340 .sig_insns = leon_flush_sig_insns,
341 .page_for_dma = leon_flush_page_for_dma,
342};
343
344void __init init_leon(void)
345{
346 srmmu_name = "LEON";
347 sparc32_cachetlb_ops = &leon_ops;
348 poke_srmmu = poke_leonsparc;
349
350 leon_flush_during_switch = leon_flush_needed();
351}
352
