1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23#include <linux/signal.h>
24#include <linux/sched.h>
25#include <linux/kernel.h>
26#include <linux/errno.h>
27#include <linux/string.h>
28#include <linux/types.h>
29#include <linux/ptrace.h>
30#include <linux/mman.h>
31#include <linux/mm.h>
32#include <linux/swap.h>
33#include <linux/stddef.h>
34#include <linux/vmalloc.h>
35#include <linux/init.h>
36#include <linux/delay.h>
37#include <linux/highmem.h>
38#include <linux/memblock.h>
39
40#include <asm/prom.h>
41#include <asm/io.h>
42#include <asm/mmu_context.h>
43#include <asm/mmu.h>
44#include <linux/uaccess.h>
45#include <asm/smp.h>
46#include <asm/machdep.h>
47#include <asm/setup.h>
48#include <asm/paca.h>
49
50#include <mm/mmu_decl.h>
51
52unsigned int tlbcam_index;
53
54#define NUM_TLBCAMS (64)
55struct tlbcam TLBCAM[NUM_TLBCAMS];
56
57struct tlbcamrange {
58 unsigned long start;
59 unsigned long limit;
60 phys_addr_t phys;
61} tlbcam_addrs[NUM_TLBCAMS];
62
63unsigned long tlbcam_sz(int idx)
64{
65 return tlbcam_addrs[idx].limit - tlbcam_addrs[idx].start + 1;
66}
67
68#ifdef CONFIG_FSL_BOOKE
69
70
71
72phys_addr_t v_block_mapped(unsigned long va)
73{
74 int b;
75 for (b = 0; b < tlbcam_index; ++b)
76 if (va >= tlbcam_addrs[b].start && va < tlbcam_addrs[b].limit)
77 return tlbcam_addrs[b].phys + (va - tlbcam_addrs[b].start);
78 return 0;
79}
80
81
82
83
84unsigned long p_block_mapped(phys_addr_t pa)
85{
86 int b;
87 for (b = 0; b < tlbcam_index; ++b)
88 if (pa >= tlbcam_addrs[b].phys
89 && pa < (tlbcam_addrs[b].limit-tlbcam_addrs[b].start)
90 +tlbcam_addrs[b].phys)
91 return tlbcam_addrs[b].start+(pa-tlbcam_addrs[b].phys);
92 return 0;
93}
94#endif
95
96
97
98
99
100
101
102
103static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
104 unsigned long size, unsigned long flags, unsigned int pid)
105{
106 unsigned int tsize;
107
108 tsize = __ilog2(size) - 10;
109
110#if defined(CONFIG_SMP) || defined(CONFIG_PPC_E500MC)
111 if ((flags & _PAGE_NO_CACHE) == 0)
112 flags |= _PAGE_COHERENT;
113#endif
114
115 TLBCAM[index].MAS0 = MAS0_TLBSEL(1) | MAS0_ESEL(index) | MAS0_NV(index+1);
116 TLBCAM[index].MAS1 = MAS1_VALID | MAS1_IPROT | MAS1_TSIZE(tsize) | MAS1_TID(pid);
117 TLBCAM[index].MAS2 = virt & PAGE_MASK;
118
119 TLBCAM[index].MAS2 |= (flags & _PAGE_WRITETHRU) ? MAS2_W : 0;
120 TLBCAM[index].MAS2 |= (flags & _PAGE_NO_CACHE) ? MAS2_I : 0;
121 TLBCAM[index].MAS2 |= (flags & _PAGE_COHERENT) ? MAS2_M : 0;
122 TLBCAM[index].MAS2 |= (flags & _PAGE_GUARDED) ? MAS2_G : 0;
123 TLBCAM[index].MAS2 |= (flags & _PAGE_ENDIAN) ? MAS2_E : 0;
124
125 TLBCAM[index].MAS3 = (phys & MAS3_RPN) | MAS3_SX | MAS3_SR;
126 TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_SW : 0);
127 if (mmu_has_feature(MMU_FTR_BIG_PHYS))
128 TLBCAM[index].MAS7 = (u64)phys >> 32;
129
130
131 if (pte_user(__pte(flags))) {
132 TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
133 TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
134 }
135
136 tlbcam_addrs[index].start = virt;
137 tlbcam_addrs[index].limit = virt + size - 1;
138 tlbcam_addrs[index].phys = phys;
139}
140
141unsigned long calc_cam_sz(unsigned long ram, unsigned long virt,
142 phys_addr_t phys)
143{
144 unsigned int camsize = __ilog2(ram);
145 unsigned int align = __ffs(virt | phys);
146 unsigned long max_cam;
147
148 if ((mfspr(SPRN_MMUCFG) & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
149
150 max_cam = ((mfspr(SPRN_TLB1CFG) >> 16) & 0xf) * 2 + 10;
151 camsize &= ~1U;
152 align &= ~1U;
153 } else {
154
155 max_cam = __ilog2(mfspr(SPRN_TLB1PS)) + 10;
156 }
157
158 if (camsize > align)
159 camsize = align;
160 if (camsize > max_cam)
161 camsize = max_cam;
162
163 return 1UL << camsize;
164}
165
166static unsigned long map_mem_in_cams_addr(phys_addr_t phys, unsigned long virt,
167 unsigned long ram, int max_cam_idx,
168 bool dryrun)
169{
170 int i;
171 unsigned long amount_mapped = 0;
172
173
174 for (i = 0; ram && i < max_cam_idx; i++) {
175 unsigned long cam_sz;
176
177 cam_sz = calc_cam_sz(ram, virt, phys);
178 if (!dryrun)
179 settlbcam(i, virt, phys, cam_sz,
180 pgprot_val(PAGE_KERNEL_X), 0);
181
182 ram -= cam_sz;
183 amount_mapped += cam_sz;
184 virt += cam_sz;
185 phys += cam_sz;
186 }
187
188 if (dryrun)
189 return amount_mapped;
190
191 loadcam_multi(0, i, max_cam_idx);
192 tlbcam_index = i;
193
194#ifdef CONFIG_PPC64
195 get_paca()->tcd.esel_next = i;
196 get_paca()->tcd.esel_max = mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY;
197 get_paca()->tcd.esel_first = i;
198#endif
199
200 return amount_mapped;
201}
202
203unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx, bool dryrun)
204{
205 unsigned long virt = PAGE_OFFSET;
206 phys_addr_t phys = memstart_addr;
207
208 return map_mem_in_cams_addr(phys, virt, ram, max_cam_idx, dryrun);
209}
210
211#ifdef CONFIG_PPC32
212
213#if defined(CONFIG_LOWMEM_CAM_NUM_BOOL) && (CONFIG_LOWMEM_CAM_NUM >= NUM_TLBCAMS)
214#error "LOWMEM_CAM_NUM must be less than NUM_TLBCAMS"
215#endif
216
217unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
218{
219 return tlbcam_addrs[tlbcam_index - 1].limit - PAGE_OFFSET + 1;
220}
221
222
223
224
225void __init MMU_init_hw(void)
226{
227 flush_instruction_cache();
228}
229
230void __init adjust_total_lowmem(void)
231{
232 unsigned long ram;
233 int i;
234
235
236 ram = min((phys_addr_t)__max_low_memory, (phys_addr_t)total_lowmem);
237
238 i = switch_to_as1();
239 __max_low_memory = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM, false);
240 restore_to_as0(i, 0, 0, 1);
241
242 pr_info("Memory CAM mapping: ");
243 for (i = 0; i < tlbcam_index - 1; i++)
244 pr_cont("%lu/", tlbcam_sz(i) >> 20);
245 pr_cont("%lu Mb, residual: %dMb\n", tlbcam_sz(tlbcam_index - 1) >> 20,
246 (unsigned int)((total_lowmem - __max_low_memory) >> 20));
247
248 memblock_set_current_limit(memstart_addr + __max_low_memory);
249}
250
251void setup_initial_memory_limit(phys_addr_t first_memblock_base,
252 phys_addr_t first_memblock_size)
253{
254 phys_addr_t limit = first_memblock_base + first_memblock_size;
255
256
257 memblock_set_current_limit(min_t(u64, limit, 0x04000000));
258}
259
260#ifdef CONFIG_RELOCATABLE
261int __initdata is_second_reloc;
262notrace void __init relocate_init(u64 dt_ptr, phys_addr_t start)
263{
264 unsigned long base = kernstart_virt_addr;
265 phys_addr_t size;
266
267 kernstart_addr = start;
268 if (is_second_reloc) {
269 virt_phys_offset = PAGE_OFFSET - memstart_addr;
270 kaslr_late_init();
271 return;
272 }
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291 start &= ~0x3ffffff;
292 base &= ~0x3ffffff;
293 virt_phys_offset = base - start;
294 early_get_first_memblock_info(__va(dt_ptr), &size);
295
296
297
298
299
300
301 if (start != memstart_addr) {
302 int n;
303 long offset = start - memstart_addr;
304
305 is_second_reloc = 1;
306 n = switch_to_as1();
307
308 if (memstart_addr > start)
309 map_mem_in_cams(0x4000000, CONFIG_LOWMEM_CAM_NUM,
310 false);
311 else
312 map_mem_in_cams_addr(start, PAGE_OFFSET + offset,
313 0x4000000, CONFIG_LOWMEM_CAM_NUM,
314 false);
315 restore_to_as0(n, offset, __va(dt_ptr), 1);
316
317 panic("Relocation error");
318 }
319
320 kaslr_early_init(__va(dt_ptr), size);
321}
322#endif
323#endif
324