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 	/*
176 	 * Helps identify source of single-step exception and subsequent
177 	 * hw-breakpoint enablement
178 	 */
179 	struct perf_event *last_hit_ubp[HBP_NUM_MAX];
180 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
181 	struct arch_hw_breakpoint hw_brk[HBP_NUM_MAX]; /* hardware breakpoint info */
182 	unsigned long	trap_nr;	/* last trap # on this thread */
183 	u8 load_slb;			/* Ages out SLB preload cache entries */
184 	u8 load_fp;
185 #ifdef CONFIG_ALTIVEC
186 	u8 load_vec;
187 	struct thread_vr_state vr_state;
188 	struct thread_vr_state *vr_save_area;
189 	unsigned long	vrsave;
190 	int		used_vr;	/* set if process has used altivec */
191 #endif /* CONFIG_ALTIVEC */
192 #ifdef CONFIG_VSX
193 	/* VSR status */
194 	int		used_vsr;	/* set if process has used VSX */
195 #endif /* CONFIG_VSX */
196 #ifdef CONFIG_SPE
197 	struct_group(spe,
198 		unsigned long	evr[32];	/* upper 32-bits of SPE regs */
199 		u64		acc;		/* Accumulator */
200 	);
201 	unsigned long	spefscr;	/* SPE & eFP status */
202 	unsigned long	spefscr_last;	/* SPEFSCR value on last prctl
203 					   call or trap return */
204 	int		used_spe;	/* set if process has used spe */
205 #endif /* CONFIG_SPE */
206 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
207 	u8	load_tm;
208 	u64		tm_tfhar;	/* Transaction fail handler addr */
209 	u64		tm_texasr;	/* Transaction exception & summary */
210 	u64		tm_tfiar;	/* Transaction fail instr address reg */
211 	struct pt_regs	ckpt_regs;	/* Checkpointed registers */
212 
213 	unsigned long	tm_tar;
214 	unsigned long	tm_ppr;
215 	unsigned long	tm_dscr;
216 	unsigned long   tm_amr;
217 
218 	/*
219 	 * Checkpointed FP and VSX 0-31 register set.
220 	 *
221 	 * When a transaction is active/signalled/scheduled etc., *regs is the
222 	 * most recent set of/speculated GPRs with ckpt_regs being the older
223 	 * checkpointed regs to which we roll back if transaction aborts.
224 	 *
225 	 * These are analogous to how ckpt_regs and pt_regs work
226 	 */
227 	struct thread_fp_state ckfp_state; /* Checkpointed FP state */
228 	struct thread_vr_state ckvr_state; /* Checkpointed VR state */
229 	unsigned long	ckvrsave; /* Checkpointed VRSAVE */
230 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
231 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
232 	void*		kvm_shadow_vcpu; /* KVM internal data */
233 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
234 #if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
235 	struct kvm_vcpu	*kvm_vcpu;
236 #endif
237 #ifdef CONFIG_PPC64
238 	unsigned long	dscr;
239 	unsigned long	fscr;
240 	/*
241 	 * This member element dscr_inherit indicates that the process
242 	 * has explicitly attempted and changed the DSCR register value
243 	 * for itself. Hence kernel wont use the default CPU DSCR value
244 	 * contained in the PACA structure anymore during process context
245 	 * switch. Once this variable is set, this behaviour will also be
246 	 * inherited to all the children of this process from that point
247 	 * onwards.
248 	 */
249 	int		dscr_inherit;
250 	unsigned long	tidr;
251 #endif
252 #ifdef CONFIG_PPC_BOOK3S_64
253 	unsigned long	tar;
254 	unsigned long	ebbrr;
255 	unsigned long	ebbhr;
256 	unsigned long	bescr;
257 	unsigned long	siar;
258 	unsigned long	sdar;
259 	unsigned long	sier;
260 	unsigned long	mmcr2;
261 	unsigned 	mmcr0;
262 
263 	unsigned 	used_ebb;
264 	unsigned long   mmcr3;
265 	unsigned long   sier2;
266 	unsigned long   sier3;
267 
268 #endif
269 };
270 
271 #define ARCH_MIN_TASKALIGN 16
272 
273 #define INIT_SP		(sizeof(init_stack) + (unsigned long) &init_stack)
274 #define INIT_SP_LIMIT	((unsigned long)&init_stack)
275 
276 #ifdef CONFIG_SPE
277 #define SPEFSCR_INIT \
278 	.spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \
279 	.spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
280 #else
281 #define SPEFSCR_INIT
282 #endif
283 
284 #ifdef CONFIG_PPC_BOOK3S_32
285 #define SR0_INIT	.sr0 = IS_ENABLED(CONFIG_PPC_KUEP) ? SR_NX : 0,
286 #else
287 #define SR0_INIT
288 #endif
289 
290 #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP)
291 #define INIT_THREAD { \
292 	.ksp = INIT_SP, \
293 	.pgdir = swapper_pg_dir, \
294 	.kuap = ~0UL, /* KUAP_NONE */ \
295 	.fpexc_mode = MSR_FE0 | MSR_FE1, \
296 	SPEFSCR_INIT \
297 	SR0_INIT \
298 }
299 #elif defined(CONFIG_PPC32)
300 #define INIT_THREAD { \
301 	.ksp = INIT_SP, \
302 	.pgdir = swapper_pg_dir, \
303 	.fpexc_mode = MSR_FE0 | MSR_FE1, \
304 	SPEFSCR_INIT \
305 	SR0_INIT \
306 }
307 #else
308 #define INIT_THREAD  { \
309 	.ksp = INIT_SP, \
310 	.fpexc_mode = 0, \
311 }
312 #endif
313 
314 #define task_pt_regs(tsk)	((tsk)->thread.regs)
315 
316 unsigned long __get_wchan(struct task_struct *p);
317 
318 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
319 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
320 
321 /* Get/set floating-point exception mode */
322 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
323 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
324 
325 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
326 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
327 
328 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
329 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
330 
331 extern int get_endian(struct task_struct *tsk, unsigned long adr);
332 extern int set_endian(struct task_struct *tsk, unsigned int val);
333 
334 #define GET_UNALIGN_CTL(tsk, adr)	get_unalign_ctl((tsk), (adr))
335 #define SET_UNALIGN_CTL(tsk, val)	set_unalign_ctl((tsk), (val))
336 
337 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
338 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
339 
340 extern void load_fp_state(struct thread_fp_state *fp);
341 extern void store_fp_state(struct thread_fp_state *fp);
342 extern void load_vr_state(struct thread_vr_state *vr);
343 extern void store_vr_state(struct thread_vr_state *vr);
344 
__unpack_fe01(unsigned long msr_bits)345 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
346 {
347 	return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
348 }
349 
__pack_fe01(unsigned int fpmode)350 static inline unsigned long __pack_fe01(unsigned int fpmode)
351 {
352 	return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
353 }
354 
355 #ifdef CONFIG_PPC64
356 
357 #define spin_begin()							\
358 	asm volatile(ASM_FTR_IFCLR(					\
359 		"or 1,1,1", /* HMT_LOW */				\
360 		"nop", /* v3.1 uses pause_short in cpu_relax instead */	\
361 		%0) :: "i" (CPU_FTR_ARCH_31) : "memory")
362 
363 #define spin_cpu_relax()						\
364 	asm volatile(ASM_FTR_IFCLR(					\
365 		"nop", /* Before v3.1 use priority nops in spin_begin/end */ \
366 		PPC_WAIT(2, 0),	/* aka pause_short */			\
367 		%0) :: "i" (CPU_FTR_ARCH_31) : "memory")
368 
369 #define spin_end()							\
370 	asm volatile(ASM_FTR_IFCLR(					\
371 		"or 2,2,2", /* HMT_MEDIUM */				\
372 		"nop",							\
373 		%0) :: "i" (CPU_FTR_ARCH_31) : "memory")
374 
375 #endif
376 
377 /* Check that a certain kernel stack pointer is valid in task_struct p */
378 int validate_sp(unsigned long sp, struct task_struct *p,
379                        unsigned long nbytes);
380 
381 /*
382  * Prefetch macros.
383  */
384 #define ARCH_HAS_PREFETCH
385 #define ARCH_HAS_PREFETCHW
386 #define ARCH_HAS_SPINLOCK_PREFETCH
387 
prefetch(const void * x)388 static inline void prefetch(const void *x)
389 {
390 	if (unlikely(!x))
391 		return;
392 
393 	__asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
394 }
395 
prefetchw(const void * x)396 static inline void prefetchw(const void *x)
397 {
398 	if (unlikely(!x))
399 		return;
400 
401 	__asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
402 }
403 
404 #define spin_lock_prefetch(x)	prefetchw(x)
405 
406 /* asm stubs */
407 extern unsigned long isa300_idle_stop_noloss(unsigned long psscr_val);
408 extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val);
409 extern unsigned long isa206_idle_insn_mayloss(unsigned long type);
410 #ifdef CONFIG_PPC_970_NAP
411 extern void power4_idle_nap(void);
412 void power4_idle_nap_return(void);
413 #endif
414 
415 extern unsigned long cpuidle_disable;
416 enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
417 
418 extern int powersave_nap;	/* set if nap mode can be used in idle loop */
419 
420 extern void power7_idle_type(unsigned long type);
421 extern void arch300_idle_type(unsigned long stop_psscr_val,
422 			      unsigned long stop_psscr_mask);
423 void pnv_power9_force_smt4_catch(void);
424 void pnv_power9_force_smt4_release(void);
425 
426 extern int fix_alignment(struct pt_regs *);
427 
428 #ifdef CONFIG_PPC64
429 /*
430  * We handle most unaligned accesses in hardware. On the other hand
431  * unaligned DMA can be very expensive on some ppc64 IO chips (it does
432  * powers of 2 writes until it reaches sufficient alignment).
433  *
434  * Based on this we disable the IP header alignment in network drivers.
435  */
436 #define NET_IP_ALIGN	0
437 #endif
438 
439 int do_mathemu(struct pt_regs *regs);
440 int do_spe_mathemu(struct pt_regs *regs);
441 int speround_handler(struct pt_regs *regs);
442 
443 /* VMX copying */
444 int enter_vmx_usercopy(void);
445 int exit_vmx_usercopy(void);
446 int enter_vmx_ops(void);
447 void *exit_vmx_ops(void *dest);
448 
449 #endif /* __KERNEL__ */
450 #endif /* __ASSEMBLY__ */
451 #endif /* _ASM_POWERPC_PROCESSOR_H */
452