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44dea393 JH |
1 | /* |
2 | * Copyright (C) 2005,2006,2007,2008,2009,2010,2011 Imagination Technologies | |
3 | * | |
4 | * This file contains the architecture-dependent parts of process handling. | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <linux/errno.h> | |
9 | #include <linux/export.h> | |
10 | #include <linux/sched.h> | |
b17b0153 | 11 | #include <linux/sched/debug.h> |
29930025 | 12 | #include <linux/sched/task.h> |
68db0cf1 | 13 | #include <linux/sched/task_stack.h> |
44dea393 JH |
14 | #include <linux/kernel.h> |
15 | #include <linux/mm.h> | |
16 | #include <linux/unistd.h> | |
17 | #include <linux/ptrace.h> | |
18 | #include <linux/user.h> | |
19 | #include <linux/reboot.h> | |
20 | #include <linux/elfcore.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/tick.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/mman.h> | |
25 | #include <linux/pm.h> | |
26 | #include <linux/syscalls.h> | |
27 | #include <linux/uaccess.h> | |
d1dba0fc | 28 | #include <linux/smp.h> |
44dea393 JH |
29 | #include <asm/core_reg.h> |
30 | #include <asm/user_gateway.h> | |
31 | #include <asm/tcm.h> | |
32 | #include <asm/traps.h> | |
33 | #include <asm/switch_to.h> | |
34 | ||
35 | /* | |
36 | * Wait for the next interrupt and enable local interrupts | |
37 | */ | |
d1dba0fc | 38 | void arch_cpu_idle(void) |
44dea393 JH |
39 | { |
40 | int tmp; | |
41 | ||
42 | /* | |
43 | * Quickly jump straight into the interrupt entry point without actually | |
44 | * triggering an interrupt. When TXSTATI gets read the processor will | |
45 | * block until an interrupt is triggered. | |
46 | */ | |
47 | asm volatile (/* Switch into ISTAT mode */ | |
48 | "RTH\n\t" | |
49 | /* Enable local interrupts */ | |
50 | "MOV TXMASKI, %1\n\t" | |
51 | /* | |
52 | * We can't directly "SWAP PC, PCX", so we swap via a | |
53 | * temporary. Essentially we do: | |
54 | * PCX_new = 1f (the place to continue execution) | |
55 | * PC = PCX_old | |
56 | */ | |
57 | "ADD %0, CPC0, #(1f-.)\n\t" | |
58 | "SWAP PCX, %0\n\t" | |
59 | "MOV PC, %0\n" | |
60 | /* Continue execution here with interrupts enabled */ | |
61 | "1:" | |
62 | : "=a" (tmp) | |
63 | : "r" (get_trigger_mask())); | |
64 | } | |
65 | ||
44dea393 | 66 | #ifdef CONFIG_HOTPLUG_CPU |
d1dba0fc TG |
67 | void arch_cpu_idle_dead(void) |
68 | { | |
69 | cpu_die(); | |
44dea393 | 70 | } |
d1dba0fc | 71 | #endif |
44dea393 JH |
72 | |
73 | void (*pm_power_off)(void); | |
74 | EXPORT_SYMBOL(pm_power_off); | |
75 | ||
76 | void (*soc_restart)(char *cmd); | |
77 | void (*soc_halt)(void); | |
78 | ||
79 | void machine_restart(char *cmd) | |
80 | { | |
81 | if (soc_restart) | |
82 | soc_restart(cmd); | |
83 | hard_processor_halt(HALT_OK); | |
84 | } | |
85 | ||
86 | void machine_halt(void) | |
87 | { | |
88 | if (soc_halt) | |
89 | soc_halt(); | |
90 | smp_send_stop(); | |
91 | hard_processor_halt(HALT_OK); | |
92 | } | |
93 | ||
94 | void machine_power_off(void) | |
95 | { | |
96 | if (pm_power_off) | |
97 | pm_power_off(); | |
98 | smp_send_stop(); | |
99 | hard_processor_halt(HALT_OK); | |
100 | } | |
101 | ||
102 | #define FLAG_Z 0x8 | |
103 | #define FLAG_N 0x4 | |
104 | #define FLAG_O 0x2 | |
105 | #define FLAG_C 0x1 | |
106 | ||
107 | void show_regs(struct pt_regs *regs) | |
108 | { | |
109 | int i; | |
110 | const char *AX0_names[] = {"A0StP", "A0FrP"}; | |
111 | const char *AX1_names[] = {"A1GbP", "A1LbP"}; | |
112 | ||
113 | const char *DX0_names[] = { | |
114 | "D0Re0", | |
115 | "D0Ar6", | |
116 | "D0Ar4", | |
117 | "D0Ar2", | |
118 | "D0FrT", | |
119 | "D0.5 ", | |
120 | "D0.6 ", | |
121 | "D0.7 " | |
122 | }; | |
123 | ||
124 | const char *DX1_names[] = { | |
125 | "D1Re0", | |
126 | "D1Ar5", | |
127 | "D1Ar3", | |
128 | "D1Ar1", | |
129 | "D1RtP", | |
130 | "D1.5 ", | |
131 | "D1.6 ", | |
132 | "D1.7 " | |
133 | }; | |
134 | ||
a43cb95d TH |
135 | show_regs_print_info(KERN_INFO); |
136 | ||
44dea393 JH |
137 | pr_info(" pt_regs @ %p\n", regs); |
138 | pr_info(" SaveMask = 0x%04hx\n", regs->ctx.SaveMask); | |
139 | pr_info(" Flags = 0x%04hx (%c%c%c%c)\n", regs->ctx.Flags, | |
140 | regs->ctx.Flags & FLAG_Z ? 'Z' : 'z', | |
141 | regs->ctx.Flags & FLAG_N ? 'N' : 'n', | |
142 | regs->ctx.Flags & FLAG_O ? 'O' : 'o', | |
143 | regs->ctx.Flags & FLAG_C ? 'C' : 'c'); | |
144 | pr_info(" TXRPT = 0x%08x\n", regs->ctx.CurrRPT); | |
145 | pr_info(" PC = 0x%08x\n", regs->ctx.CurrPC); | |
146 | ||
147 | /* AX regs */ | |
148 | for (i = 0; i < 2; i++) { | |
149 | pr_info(" %s = 0x%08x ", | |
150 | AX0_names[i], | |
151 | regs->ctx.AX[i].U0); | |
152 | printk(" %s = 0x%08x\n", | |
153 | AX1_names[i], | |
154 | regs->ctx.AX[i].U1); | |
155 | } | |
156 | ||
157 | if (regs->ctx.SaveMask & TBICTX_XEXT_BIT) | |
158 | pr_warn(" Extended state present - AX2.[01] will be WRONG\n"); | |
159 | ||
160 | /* Special place with AXx.2 */ | |
161 | pr_info(" A0.2 = 0x%08x ", | |
162 | regs->ctx.Ext.AX2.U0); | |
163 | printk(" A1.2 = 0x%08x\n", | |
164 | regs->ctx.Ext.AX2.U1); | |
165 | ||
166 | /* 'extended' AX regs (nominally, just AXx.3) */ | |
167 | for (i = 0; i < (TBICTX_AX_REGS - 3); i++) { | |
168 | pr_info(" A0.%d = 0x%08x ", i + 3, regs->ctx.AX3[i].U0); | |
169 | printk(" A1.%d = 0x%08x\n", i + 3, regs->ctx.AX3[i].U1); | |
170 | } | |
171 | ||
172 | for (i = 0; i < 8; i++) { | |
173 | pr_info(" %s = 0x%08x ", DX0_names[i], regs->ctx.DX[i].U0); | |
174 | printk(" %s = 0x%08x\n", DX1_names[i], regs->ctx.DX[i].U1); | |
175 | } | |
176 | ||
177 | show_trace(NULL, (unsigned long *)regs->ctx.AX[0].U0, regs); | |
178 | } | |
179 | ||
40346a03 AD |
180 | /* |
181 | * Copy architecture-specific thread state | |
182 | */ | |
44dea393 | 183 | int copy_thread(unsigned long clone_flags, unsigned long usp, |
40346a03 | 184 | unsigned long kthread_arg, struct task_struct *tsk) |
44dea393 JH |
185 | { |
186 | struct pt_regs *childregs = task_pt_regs(tsk); | |
187 | void *kernel_context = ((void *) childregs + | |
188 | sizeof(struct pt_regs)); | |
189 | unsigned long global_base; | |
190 | ||
191 | BUG_ON(((unsigned long)childregs) & 0x7); | |
192 | BUG_ON(((unsigned long)kernel_context) & 0x7); | |
193 | ||
194 | memset(&tsk->thread.kernel_context, 0, | |
195 | sizeof(tsk->thread.kernel_context)); | |
196 | ||
197 | tsk->thread.kernel_context = __TBISwitchInit(kernel_context, | |
198 | ret_from_fork, | |
199 | 0, 0); | |
200 | ||
201 | if (unlikely(tsk->flags & PF_KTHREAD)) { | |
202 | /* | |
203 | * Make sure we don't leak any kernel data to child's regs | |
204 | * if kernel thread becomes a userspace thread in the future | |
205 | */ | |
206 | memset(childregs, 0 , sizeof(struct pt_regs)); | |
207 | ||
208 | global_base = __core_reg_get(A1GbP); | |
209 | childregs->ctx.AX[0].U1 = (unsigned long) global_base; | |
210 | childregs->ctx.AX[0].U0 = (unsigned long) kernel_context; | |
40346a03 | 211 | /* Set D1Ar1=kthread_arg and D1RtP=usp (fn) */ |
44dea393 | 212 | childregs->ctx.DX[4].U1 = usp; |
40346a03 | 213 | childregs->ctx.DX[3].U1 = kthread_arg; |
44dea393 JH |
214 | tsk->thread.int_depth = 2; |
215 | return 0; | |
216 | } | |
40346a03 | 217 | |
44dea393 JH |
218 | /* |
219 | * Get a pointer to where the new child's register block should have | |
220 | * been pushed. | |
221 | * The Meta's stack grows upwards, and the context is the the first | |
222 | * thing to be pushed by TBX (phew) | |
223 | */ | |
224 | *childregs = *current_pt_regs(); | |
225 | /* Set the correct stack for the clone mode */ | |
226 | if (usp) | |
227 | childregs->ctx.AX[0].U0 = ALIGN(usp, 8); | |
228 | tsk->thread.int_depth = 1; | |
229 | ||
230 | /* set return value for child process */ | |
231 | childregs->ctx.DX[0].U0 = 0; | |
232 | ||
233 | /* The TLS pointer is passed as an argument to sys_clone. */ | |
234 | if (clone_flags & CLONE_SETTLS) | |
235 | tsk->thread.tls_ptr = | |
236 | (__force void __user *)childregs->ctx.DX[1].U1; | |
237 | ||
238 | #ifdef CONFIG_METAG_FPU | |
239 | if (tsk->thread.fpu_context) { | |
240 | struct meta_fpu_context *ctx; | |
241 | ||
242 | ctx = kmemdup(tsk->thread.fpu_context, | |
243 | sizeof(struct meta_fpu_context), GFP_ATOMIC); | |
244 | tsk->thread.fpu_context = ctx; | |
245 | } | |
246 | #endif | |
247 | ||
248 | #ifdef CONFIG_METAG_DSP | |
249 | if (tsk->thread.dsp_context) { | |
250 | struct meta_ext_context *ctx; | |
251 | int i; | |
252 | ||
253 | ctx = kmemdup(tsk->thread.dsp_context, | |
254 | sizeof(struct meta_ext_context), GFP_ATOMIC); | |
255 | for (i = 0; i < 2; i++) | |
256 | ctx->ram[i] = kmemdup(ctx->ram[i], ctx->ram_sz[i], | |
257 | GFP_ATOMIC); | |
258 | tsk->thread.dsp_context = ctx; | |
259 | } | |
260 | #endif | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | #ifdef CONFIG_METAG_FPU | |
266 | static void alloc_fpu_context(struct thread_struct *thread) | |
267 | { | |
268 | thread->fpu_context = kzalloc(sizeof(struct meta_fpu_context), | |
269 | GFP_ATOMIC); | |
270 | } | |
271 | ||
272 | static void clear_fpu(struct thread_struct *thread) | |
273 | { | |
274 | thread->user_flags &= ~TBICTX_FPAC_BIT; | |
275 | kfree(thread->fpu_context); | |
276 | thread->fpu_context = NULL; | |
277 | } | |
278 | #else | |
279 | static void clear_fpu(struct thread_struct *thread) | |
280 | { | |
281 | } | |
282 | #endif | |
283 | ||
284 | #ifdef CONFIG_METAG_DSP | |
285 | static void clear_dsp(struct thread_struct *thread) | |
286 | { | |
287 | if (thread->dsp_context) { | |
288 | kfree(thread->dsp_context->ram[0]); | |
289 | kfree(thread->dsp_context->ram[1]); | |
290 | ||
291 | kfree(thread->dsp_context); | |
292 | ||
293 | thread->dsp_context = NULL; | |
294 | } | |
295 | ||
296 | __core_reg_set(D0.8, 0); | |
297 | } | |
298 | #else | |
299 | static void clear_dsp(struct thread_struct *thread) | |
300 | { | |
301 | } | |
302 | #endif | |
303 | ||
304 | struct task_struct *__sched __switch_to(struct task_struct *prev, | |
305 | struct task_struct *next) | |
306 | { | |
307 | TBIRES to, from; | |
308 | ||
309 | to.Switch.pCtx = next->thread.kernel_context; | |
310 | to.Switch.pPara = prev; | |
311 | ||
312 | #ifdef CONFIG_METAG_FPU | |
313 | if (prev->thread.user_flags & TBICTX_FPAC_BIT) { | |
314 | struct pt_regs *regs = task_pt_regs(prev); | |
315 | TBIRES state; | |
316 | ||
317 | state.Sig.SaveMask = prev->thread.user_flags; | |
318 | state.Sig.pCtx = ®s->ctx; | |
319 | ||
320 | if (!prev->thread.fpu_context) | |
321 | alloc_fpu_context(&prev->thread); | |
322 | if (prev->thread.fpu_context) | |
323 | __TBICtxFPUSave(state, prev->thread.fpu_context); | |
324 | } | |
325 | /* | |
326 | * Force a restore of the FPU context next time this process is | |
327 | * scheduled. | |
328 | */ | |
329 | if (prev->thread.fpu_context) | |
330 | prev->thread.fpu_context->needs_restore = true; | |
331 | #endif | |
332 | ||
333 | ||
334 | from = __TBISwitch(to, &prev->thread.kernel_context); | |
335 | ||
336 | /* Restore TLS pointer for this process. */ | |
337 | set_gateway_tls(current->thread.tls_ptr); | |
338 | ||
339 | return (struct task_struct *) from.Switch.pPara; | |
340 | } | |
341 | ||
342 | void flush_thread(void) | |
343 | { | |
344 | clear_fpu(¤t->thread); | |
345 | clear_dsp(¤t->thread); | |
346 | } | |
347 | ||
348 | /* | |
349 | * Free current thread data structures etc. | |
350 | */ | |
e6464694 | 351 | void exit_thread(struct task_struct *tsk) |
44dea393 | 352 | { |
e6464694 JS |
353 | clear_fpu(&tsk->thread); |
354 | clear_dsp(&tsk->thread); | |
44dea393 JH |
355 | } |
356 | ||
357 | /* TODO: figure out how to unwind the kernel stack here to figure out | |
358 | * where we went to sleep. */ | |
359 | unsigned long get_wchan(struct task_struct *p) | |
360 | { | |
361 | return 0; | |
362 | } | |
363 | ||
364 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
365 | { | |
366 | /* Returning 0 indicates that the FPU state was not stored (as it was | |
367 | * not in use) */ | |
368 | return 0; | |
369 | } | |
370 | ||
371 | #ifdef CONFIG_METAG_USER_TCM | |
372 | ||
373 | #define ELF_MIN_ALIGN PAGE_SIZE | |
374 | ||
375 | #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) | |
376 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) | |
377 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) | |
378 | ||
379 | #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) | |
380 | ||
381 | unsigned long __metag_elf_map(struct file *filep, unsigned long addr, | |
382 | struct elf_phdr *eppnt, int prot, int type, | |
383 | unsigned long total_size) | |
384 | { | |
385 | unsigned long map_addr, size; | |
386 | unsigned long page_off = ELF_PAGEOFFSET(eppnt->p_vaddr); | |
387 | unsigned long raw_size = eppnt->p_filesz + page_off; | |
388 | unsigned long off = eppnt->p_offset - page_off; | |
389 | unsigned int tcm_tag; | |
390 | addr = ELF_PAGESTART(addr); | |
391 | size = ELF_PAGEALIGN(raw_size); | |
392 | ||
393 | /* mmap() will return -EINVAL if given a zero size, but a | |
394 | * segment with zero filesize is perfectly valid */ | |
395 | if (!size) | |
396 | return addr; | |
397 | ||
398 | tcm_tag = tcm_lookup_tag(addr); | |
399 | ||
400 | if (tcm_tag != TCM_INVALID_TAG) | |
401 | type &= ~MAP_FIXED; | |
402 | ||
403 | /* | |
404 | * total_size is the size of the ELF (interpreter) image. | |
405 | * The _first_ mmap needs to know the full size, otherwise | |
406 | * randomization might put this image into an overlapping | |
407 | * position with the ELF binary image. (since size < total_size) | |
408 | * So we first map the 'big' image - and unmap the remainder at | |
409 | * the end. (which unmap is needed for ELF images with holes.) | |
410 | */ | |
411 | if (total_size) { | |
412 | total_size = ELF_PAGEALIGN(total_size); | |
413 | map_addr = vm_mmap(filep, addr, total_size, prot, type, off); | |
414 | if (!BAD_ADDR(map_addr)) | |
415 | vm_munmap(map_addr+size, total_size-size); | |
416 | } else | |
417 | map_addr = vm_mmap(filep, addr, size, prot, type, off); | |
418 | ||
419 | if (!BAD_ADDR(map_addr) && tcm_tag != TCM_INVALID_TAG) { | |
420 | struct tcm_allocation *tcm; | |
421 | unsigned long tcm_addr; | |
422 | ||
423 | tcm = kmalloc(sizeof(*tcm), GFP_KERNEL); | |
424 | if (!tcm) | |
425 | return -ENOMEM; | |
426 | ||
427 | tcm_addr = tcm_alloc(tcm_tag, raw_size); | |
428 | if (tcm_addr != addr) { | |
429 | kfree(tcm); | |
430 | return -ENOMEM; | |
431 | } | |
432 | ||
433 | tcm->tag = tcm_tag; | |
434 | tcm->addr = tcm_addr; | |
435 | tcm->size = raw_size; | |
436 | ||
437 | list_add(&tcm->list, ¤t->mm->context.tcm); | |
438 | ||
439 | eppnt->p_vaddr = map_addr; | |
440 | if (copy_from_user((void *) addr, (void __user *) map_addr, | |
441 | raw_size)) | |
442 | return -EFAULT; | |
443 | } | |
444 | ||
445 | return map_addr; | |
446 | } | |
447 | #endif |