1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _ASM_POWERPC_PROCESSOR_H
3 #define _ASM_POWERPC_PROCESSOR_H
4
5 /*
6 * Copyright (C) 2001 PPC 64 Team, IBM Corp
7 */
8
9 #include <vdso/processor.h>
10
11 #include <asm/reg.h>
12
13 #ifdef CONFIG_VSX
14 #define TS_FPRWIDTH 2
15
16 #ifdef __BIG_ENDIAN__
17 #define TS_FPROFFSET 0
18 #define TS_VSRLOWOFFSET 1
19 #else
20 #define TS_FPROFFSET 1
21 #define TS_VSRLOWOFFSET 0
22 #endif
23
24 #else
25 #define TS_FPRWIDTH 1
26 #define TS_FPROFFSET 0
27 #endif
28
29 #ifdef CONFIG_PPC64
30 /* Default SMT priority is set to 3. Use 11- 13bits to save priority. */
31 #define PPR_PRIORITY 3
32 #ifdef __ASSEMBLY__
33 #define DEFAULT_PPR (PPR_PRIORITY << 50)
34 #else
35 #define DEFAULT_PPR ((u64)PPR_PRIORITY << 50)
36 #endif /* __ASSEMBLY__ */
37 #endif /* CONFIG_PPC64 */
38
39 #ifndef __ASSEMBLY__
40 #include <linux/types.h>
41 #include <linux/thread_info.h>
42 #include <asm/ptrace.h>
43 #include <asm/hw_breakpoint.h>
44
45 /* We do _not_ want to define new machine types at all, those must die
46 * in favor of using the device-tree
47 * -- BenH.
48 */
49
50 /* PREP sub-platform types. Unused */
51 #define _PREP_Motorola 0x01 /* motorola prep */
52 #define _PREP_Firm 0x02 /* firmworks prep */
53 #define _PREP_IBM 0x00 /* ibm prep */
54 #define _PREP_Bull 0x03 /* bull prep */
55
56 /* CHRP sub-platform types. These are arbitrary */
57 #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */
58 #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */
59 #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */
60 #define _CHRP_briq 0x07 /* TotalImpact's briQ */
61
62 #if defined(__KERNEL__) && defined(CONFIG_PPC32)
63
64 extern int _chrp_type;
65
66 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
67
68 #ifdef __KERNEL__
69
70 #ifdef CONFIG_PPC64
71 #include <asm/task_size_64.h>
72 #else
73 #include <asm/task_size_32.h>
74 #endif
75
76 struct task_struct;
77 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
78
79 #define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET]
80 #define TS_CKFPR(i) ckfp_state.fpr[i][TS_FPROFFSET]
81
82 /* FP and VSX 0-31 register set */
83 struct thread_fp_state {
84 u64 fpr[32][TS_FPRWIDTH] __attribute__((aligned(16)));
85 u64 fpscr; /* Floating point status */
86 };
87
88 /* Complete AltiVec register set including VSCR */
89 struct thread_vr_state {
90 vector128 vr[32] __attribute__((aligned(16)));
91 vector128 vscr __attribute__((aligned(16)));
92 };
93
94 struct debug_reg {
95 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
96 /*
97 * The following help to manage the use of Debug Control Registers
98 * om the BookE platforms.
99 */
100 uint32_t dbcr0;
101 uint32_t dbcr1;
102 #ifdef CONFIG_BOOKE
103 uint32_t dbcr2;
104 #endif
105 /*
106 * The stored value of the DBSR register will be the value at the
107 * last debug interrupt. This register can only be read from the
108 * user (will never be written to) and has value while helping to
109 * describe the reason for the last debug trap. Torez
110 */
111 uint32_t dbsr;
112 /*
113 * The following will contain addresses used by debug applications
114 * to help trace and trap on particular address locations.
115 * The bits in the Debug Control Registers above help define which
116 * of the following registers will contain valid data and/or addresses.
117 */
118 unsigned long iac1;
119 unsigned long iac2;
120 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
121 unsigned long iac3;
122 unsigned long iac4;
123 #endif
124 unsigned long dac1;
125 unsigned long dac2;
126 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
127 unsigned long dvc1;
128 unsigned long dvc2;
129 #endif
130 #endif
131 };
132
133 struct thread_struct {
134 unsigned long ksp; /* Kernel stack pointer */
135
136 #ifdef CONFIG_PPC64
137 unsigned long ksp_vsid;
138 #endif
139 struct pt_regs *regs; /* Pointer to saved register state */
140 #ifdef CONFIG_BOOKE
141 /* BookE base exception scratch space; align on cacheline */
142 unsigned long normsave[8] ____cacheline_aligned;
143 #endif
144 #ifdef CONFIG_PPC32
145 void *pgdir; /* root of page-table tree */
146 #ifdef CONFIG_PPC_RTAS
147 unsigned long rtas_sp; /* stack pointer for when in RTAS */
148 #endif
149 #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP)
150 unsigned long kuap; /* opened segments for user access */
151 #endif
152 unsigned long srr0;
153 unsigned long srr1;
154 unsigned long dar;
155 unsigned long dsisr;
156 #ifdef CONFIG_PPC_BOOK3S_32
157 unsigned long r0, r3, r4, r5, r6, r8, r9, r11;
158 unsigned long lr, ctr;
159 unsigned long sr0;
160 #endif
161 #endif /* CONFIG_PPC32 */
162 #if defined(CONFIG_BOOKE_OR_40x) && defined(CONFIG_PPC_KUAP)
163 unsigned long pid; /* value written in PID reg. at interrupt exit */
164 #endif
165 /* Debug Registers */
166 struct debug_reg debug;
167 #ifdef CONFIG_PPC_FPU_REGS
168 struct thread_fp_state fp_state;
169 struct thread_fp_state *fp_save_area;
170 #endif
171 int fpexc_mode; /* floating-point exception mode */
172 unsigned int align_ctl; /* alignment handling control */
173 #ifdef CONFIG_HAVE_HW_BREAKPOINT
174 struct perf_event *ptrace_bps[HBP_NUM_MAX];
175 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
176 struct arch_hw_breakpoint hw_brk[HBP_NUM_MAX]; /* hardware breakpoint info */
177 unsigned long trap_nr; /* last trap # on this thread */
178 u8 load_slb; /* Ages out SLB preload cache entries */
179 u8 load_fp;
180 #ifdef CONFIG_ALTIVEC
181 u8 load_vec;
182 struct thread_vr_state vr_state;
183 struct thread_vr_state *vr_save_area;
184 unsigned long vrsave;
185 int used_vr; /* set if process has used altivec */
186 #endif /* CONFIG_ALTIVEC */
187 #ifdef CONFIG_VSX
188 /* VSR status */
189 int used_vsr; /* set if process has used VSX */
190 #endif /* CONFIG_VSX */
191 #ifdef CONFIG_SPE
192 struct_group(spe,
193 unsigned long evr[32]; /* upper 32-bits of SPE regs */
194 u64 acc; /* Accumulator */
195 );
196 unsigned long spefscr; /* SPE & eFP status */
197 unsigned long spefscr_last; /* SPEFSCR value on last prctl
198 call or trap return */
199 int used_spe; /* set if process has used spe */
200 #endif /* CONFIG_SPE */
201 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
202 u8 load_tm;
203 u64 tm_tfhar; /* Transaction fail handler addr */
204 u64 tm_texasr; /* Transaction exception & summary */
205 u64 tm_tfiar; /* Transaction fail instr address reg */
206 struct pt_regs ckpt_regs; /* Checkpointed registers */
207
208 unsigned long tm_tar;
209 unsigned long tm_ppr;
210 unsigned long tm_dscr;
211 unsigned long tm_amr;
212
213 /*
214 * Checkpointed FP and VSX 0-31 register set.
215 *
216 * When a transaction is active/signalled/scheduled etc., *regs is the
217 * most recent set of/speculated GPRs with ckpt_regs being the older
218 * checkpointed regs to which we roll back if transaction aborts.
219 *
220 * These are analogous to how ckpt_regs and pt_regs work
221 */
222 struct thread_fp_state ckfp_state; /* Checkpointed FP state */
223 struct thread_vr_state ckvr_state; /* Checkpointed VR state */
224 unsigned long ckvrsave; /* Checkpointed VRSAVE */
225 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
226 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
227 void* kvm_shadow_vcpu; /* KVM internal data */
228 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
229 #if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
230 struct kvm_vcpu *kvm_vcpu;
231 #endif
232 #ifdef CONFIG_PPC64
233 unsigned long dscr;
234 unsigned long fscr;
235 /*
236 * This member element dscr_inherit indicates that the process
237 * has explicitly attempted and changed the DSCR register value
238 * for itself. Hence kernel wont use the default CPU DSCR value
239 * contained in the PACA structure anymore during process context
240 * switch. Once this variable is set, this behaviour will also be
241 * inherited to all the children of this process from that point
242 * onwards.
243 */
244 int dscr_inherit;
245 unsigned long tidr;
246 #endif
247 #ifdef CONFIG_PPC_BOOK3S_64
248 unsigned long tar;
249 unsigned long ebbrr;
250 unsigned long ebbhr;
251 unsigned long bescr;
252 unsigned long siar;
253 unsigned long sdar;
254 unsigned long sier;
255 unsigned long mmcr2;
256 unsigned mmcr0;
257
258 unsigned used_ebb;
259 unsigned long mmcr3;
260 unsigned long sier2;
261 unsigned long sier3;
262 unsigned long hashkeyr;
263 unsigned long dexcr;
264 unsigned long dexcr_onexec; /* Reset value to load on exec */
265 #endif
266 };
267
268 #define ARCH_MIN_TASKALIGN 16
269
270 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
271 #define INIT_SP_LIMIT ((unsigned long)&init_stack)
272
273 #ifdef CONFIG_SPE
274 #define SPEFSCR_INIT \
275 .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \
276 .spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
277 #else
278 #define SPEFSCR_INIT
279 #endif
280
281 #ifdef CONFIG_PPC_BOOK3S_32
282 #define SR0_INIT .sr0 = IS_ENABLED(CONFIG_PPC_KUEP) ? SR_NX : 0,
283 #else
284 #define SR0_INIT
285 #endif
286
287 #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP)
288 #define INIT_THREAD { \
289 .ksp = INIT_SP, \
290 .pgdir = swapper_pg_dir, \
291 .kuap = ~0UL, /* KUAP_NONE */ \
292 .fpexc_mode = MSR_FE0 | MSR_FE1, \
293 SPEFSCR_INIT \
294 SR0_INIT \
295 }
296 #elif defined(CONFIG_PPC32)
297 #define INIT_THREAD { \
298 .ksp = INIT_SP, \
299 .pgdir = swapper_pg_dir, \
300 .fpexc_mode = MSR_FE0 | MSR_FE1, \
301 SPEFSCR_INIT \
302 SR0_INIT \
303 }
304 #else
305 #define INIT_THREAD { \
306 .ksp = INIT_SP, \
307 .fpexc_mode = 0, \
308 }
309 #endif
310
311 #define task_pt_regs(tsk) ((tsk)->thread.regs)
312
313 unsigned long __get_wchan(struct task_struct *p);
314
315 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
316 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
317
318 /* Get/set floating-point exception mode */
319 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
320 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
321
322 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
323 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
324
325 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
326 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
327
328 extern int get_endian(struct task_struct *tsk, unsigned long adr);
329 extern int set_endian(struct task_struct *tsk, unsigned int val);
330
331 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
332 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
333
334 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
335 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
336
337 #ifdef CONFIG_PPC_BOOK3S_64
338
339 #define PPC_GET_DEXCR_ASPECT(tsk, asp) get_dexcr_prctl((tsk), (asp))
340 #define PPC_SET_DEXCR_ASPECT(tsk, asp, val) set_dexcr_prctl((tsk), (asp), (val))
341
342 int get_dexcr_prctl(struct task_struct *tsk, unsigned long asp);
343 int set_dexcr_prctl(struct task_struct *tsk, unsigned long asp, unsigned long val);
344
345 #endif
346
347 extern void load_fp_state(struct thread_fp_state *fp);
348 extern void store_fp_state(struct thread_fp_state *fp);
349 extern void load_vr_state(struct thread_vr_state *vr);
350 extern void store_vr_state(struct thread_vr_state *vr);
351
__unpack_fe01(unsigned long msr_bits)352 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
353 {
354 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
355 }
356
__pack_fe01(unsigned int fpmode)357 static inline unsigned long __pack_fe01(unsigned int fpmode)
358 {
359 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
360 }
361
362 #ifdef CONFIG_PPC64
363
364 #define spin_begin() \
365 asm volatile(ASM_FTR_IFCLR( \
366 "or 1,1,1", /* HMT_LOW */ \
367 "nop", /* v3.1 uses pause_short in cpu_relax instead */ \
368 %0) :: "i" (CPU_FTR_ARCH_31) : "memory")
369
370 #define spin_cpu_relax() \
371 asm volatile(ASM_FTR_IFCLR( \
372 "nop", /* Before v3.1 use priority nops in spin_begin/end */ \
373 PPC_WAIT(2, 0), /* aka pause_short */ \
374 %0) :: "i" (CPU_FTR_ARCH_31) : "memory")
375
376 #define spin_end() \
377 asm volatile(ASM_FTR_IFCLR( \
378 "or 2,2,2", /* HMT_MEDIUM */ \
379 "nop", \
380 %0) :: "i" (CPU_FTR_ARCH_31) : "memory")
381
382 #endif
383
384 /*
385 * Check that a certain kernel stack pointer is a valid (minimum sized)
386 * stack frame in task_struct p.
387 */
388 int validate_sp(unsigned long sp, struct task_struct *p);
389
390 /*
391 * validate the stack frame of a particular minimum size, used for when we are
392 * looking at a certain object in the stack beyond the minimum.
393 */
394 int validate_sp_size(unsigned long sp, struct task_struct *p,
395 unsigned long nbytes);
396
397 /*
398 * Prefetch macros.
399 */
400 #define ARCH_HAS_PREFETCH
401 #define ARCH_HAS_PREFETCHW
402
prefetch(const void * x)403 static inline void prefetch(const void *x)
404 {
405 if (unlikely(!x))
406 return;
407
408 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
409 }
410
prefetchw(const void * x)411 static inline void prefetchw(const void *x)
412 {
413 if (unlikely(!x))
414 return;
415
416 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
417 }
418
419 /* asm stubs */
420 extern unsigned long isa300_idle_stop_noloss(unsigned long psscr_val);
421 extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val);
422 extern unsigned long isa206_idle_insn_mayloss(unsigned long type);
423 #ifdef CONFIG_PPC_970_NAP
424 extern void power4_idle_nap(void);
425 void power4_idle_nap_return(void);
426 #endif
427
428 extern unsigned long cpuidle_disable;
429 enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
430
431 extern int powersave_nap; /* set if nap mode can be used in idle loop */
432
433 extern void power7_idle_type(unsigned long type);
434 extern void arch300_idle_type(unsigned long stop_psscr_val,
435 unsigned long stop_psscr_mask);
436 void pnv_power9_force_smt4_catch(void);
437 void pnv_power9_force_smt4_release(void);
438
439 extern int fix_alignment(struct pt_regs *);
440
441 #ifdef CONFIG_PPC64
442 /*
443 * We handle most unaligned accesses in hardware. On the other hand
444 * unaligned DMA can be very expensive on some ppc64 IO chips (it does
445 * powers of 2 writes until it reaches sufficient alignment).
446 *
447 * Based on this we disable the IP header alignment in network drivers.
448 */
449 #define NET_IP_ALIGN 0
450 #endif
451
452 int do_mathemu(struct pt_regs *regs);
453 int do_spe_mathemu(struct pt_regs *regs);
454 int speround_handler(struct pt_regs *regs);
455
456 /* VMX copying */
457 int enter_vmx_usercopy(void);
458 int exit_vmx_usercopy(void);
459 int enter_vmx_ops(void);
460 void *exit_vmx_ops(void *dest);
461
462 #endif /* __KERNEL__ */
463 #endif /* __ASSEMBLY__ */
464 #endif /* _ASM_POWERPC_PROCESSOR_H */
465