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 void release_thread(struct task_struct *);
79 
80 #define TS_FPR(i) fp_state.fpr[i][TS_FPROFFSET]
81 #define TS_CKFPR(i) ckfp_state.fpr[i][TS_FPROFFSET]
82 
83 /* FP and VSX 0-31 register set */
84 struct thread_fp_state {
85 	u64	fpr[32][TS_FPRWIDTH] __attribute__((aligned(16)));
86 	u64	fpscr;		/* Floating point status */
87 };
88 
89 /* Complete AltiVec register set including VSCR */
90 struct thread_vr_state {
91 	vector128	vr[32] __attribute__((aligned(16)));
92 	vector128	vscr __attribute__((aligned(16)));
93 };
94 
95 struct debug_reg {
96 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
97 	/*
98 	 * The following help to manage the use of Debug Control Registers
99 	 * om the BookE platforms.
100 	 */
101 	uint32_t	dbcr0;
102 	uint32_t	dbcr1;
103 #ifdef CONFIG_BOOKE
104 	uint32_t	dbcr2;
105 #endif
106 	/*
107 	 * The stored value of the DBSR register will be the value at the
108 	 * last debug interrupt. This register can only be read from the
109 	 * user (will never be written to) and has value while helping to
110 	 * describe the reason for the last debug trap.  Torez
111 	 */
112 	uint32_t	dbsr;
113 	/*
114 	 * The following will contain addresses used by debug applications
115 	 * to help trace and trap on particular address locations.
116 	 * The bits in the Debug Control Registers above help define which
117 	 * of the following registers will contain valid data and/or addresses.
118 	 */
119 	unsigned long	iac1;
120 	unsigned long	iac2;
121 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
122 	unsigned long	iac3;
123 	unsigned long	iac4;
124 #endif
125 	unsigned long	dac1;
126 	unsigned long	dac2;
127 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
128 	unsigned long	dvc1;
129 	unsigned long	dvc2;
130 #endif
131 #endif
132 };
133 
134 struct thread_struct {
135 	unsigned long	ksp;		/* Kernel stack pointer */
136 
137 #ifdef CONFIG_PPC64
138 	unsigned long	ksp_vsid;
139 #endif
140 	struct pt_regs	*regs;		/* Pointer to saved register state */
141 #ifdef CONFIG_BOOKE
142 	/* BookE base exception scratch space; align on cacheline */
143 	unsigned long	normsave[8] ____cacheline_aligned;
144 #endif
145 #ifdef CONFIG_PPC32
146 	void		*pgdir;		/* root of page-table tree */
147 #ifdef CONFIG_PPC_RTAS
148 	unsigned long	rtas_sp;	/* stack pointer for when in RTAS */
149 #endif
150 #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP)
151 	unsigned long	kuap;		/* opened segments for user access */
152 #endif
153 	unsigned long	srr0;
154 	unsigned long	srr1;
155 	unsigned long	dar;
156 	unsigned long	dsisr;
157 #ifdef CONFIG_PPC_BOOK3S_32
158 	unsigned long	r0, r3, r4, r5, r6, r8, r9, r11;
159 	unsigned long	lr, ctr;
160 	unsigned long	sr0;
161 #endif
162 #endif /* CONFIG_PPC32 */
163 #if defined(CONFIG_BOOKE_OR_40x) && defined(CONFIG_PPC_KUAP)
164 	unsigned long	pid;	/* value written in PID reg. at interrupt exit */
165 #endif
166 	/* Debug Registers */
167 	struct debug_reg debug;
168 #ifdef CONFIG_PPC_FPU_REGS
169 	struct thread_fp_state	fp_state;
170 	struct thread_fp_state	*fp_save_area;
171 #endif
172 	int		fpexc_mode;	/* floating-point exception mode */
173 	unsigned int	align_ctl;	/* alignment handling control */
174 #ifdef CONFIG_HAVE_HW_BREAKPOINT
175 	struct perf_event *ptrace_bps[HBP_NUM_MAX];
176 	/*
177 	 * Helps identify source of single-step exception and subsequent
178 	 * hw-breakpoint enablement
179 	 */
180 	struct perf_event *last_hit_ubp[HBP_NUM_MAX];
181 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
182 	struct arch_hw_breakpoint hw_brk[HBP_NUM_MAX]; /* hardware breakpoint info */
183 	unsigned long	trap_nr;	/* last trap # on this thread */
184 	u8 load_slb;			/* Ages out SLB preload cache entries */
185 	u8 load_fp;
186 #ifdef CONFIG_ALTIVEC
187 	u8 load_vec;
188 	struct thread_vr_state vr_state;
189 	struct thread_vr_state *vr_save_area;
190 	unsigned long	vrsave;
191 	int		used_vr;	/* set if process has used altivec */
192 #endif /* CONFIG_ALTIVEC */
193 #ifdef CONFIG_VSX
194 	/* VSR status */
195 	int		used_vsr;	/* set if process has used VSX */
196 #endif /* CONFIG_VSX */
197 #ifdef CONFIG_SPE
198 	struct_group(spe,
199 		unsigned long	evr[32];	/* upper 32-bits of SPE regs */
200 		u64		acc;		/* Accumulator */
201 	);
202 	unsigned long	spefscr;	/* SPE & eFP status */
203 	unsigned long	spefscr_last;	/* SPEFSCR value on last prctl
204 					   call or trap return */
205 	int		used_spe;	/* set if process has used spe */
206 #endif /* CONFIG_SPE */
207 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
208 	u8	load_tm;
209 	u64		tm_tfhar;	/* Transaction fail handler addr */
210 	u64		tm_texasr;	/* Transaction exception & summary */
211 	u64		tm_tfiar;	/* Transaction fail instr address reg */
212 	struct pt_regs	ckpt_regs;	/* Checkpointed registers */
213 
214 	unsigned long	tm_tar;
215 	unsigned long	tm_ppr;
216 	unsigned long	tm_dscr;
217 	unsigned long   tm_amr;
218 
219 	/*
220 	 * Checkpointed FP and VSX 0-31 register set.
221 	 *
222 	 * When a transaction is active/signalled/scheduled etc., *regs is the
223 	 * most recent set of/speculated GPRs with ckpt_regs being the older
224 	 * checkpointed regs to which we roll back if transaction aborts.
225 	 *
226 	 * These are analogous to how ckpt_regs and pt_regs work
227 	 */
228 	struct thread_fp_state ckfp_state; /* Checkpointed FP state */
229 	struct thread_vr_state ckvr_state; /* Checkpointed VR state */
230 	unsigned long	ckvrsave; /* Checkpointed VRSAVE */
231 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
232 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
233 	void*		kvm_shadow_vcpu; /* KVM internal data */
234 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
235 #if defined(CONFIG_KVM) && defined(CONFIG_BOOKE)
236 	struct kvm_vcpu	*kvm_vcpu;
237 #endif
238 #ifdef CONFIG_PPC64
239 	unsigned long	dscr;
240 	unsigned long	fscr;
241 	/*
242 	 * This member element dscr_inherit indicates that the process
243 	 * has explicitly attempted and changed the DSCR register value
244 	 * for itself. Hence kernel wont use the default CPU DSCR value
245 	 * contained in the PACA structure anymore during process context
246 	 * switch. Once this variable is set, this behaviour will also be
247 	 * inherited to all the children of this process from that point
248 	 * onwards.
249 	 */
250 	int		dscr_inherit;
251 	unsigned long	tidr;
252 #endif
253 #ifdef CONFIG_PPC_BOOK3S_64
254 	unsigned long	tar;
255 	unsigned long	ebbrr;
256 	unsigned long	ebbhr;
257 	unsigned long	bescr;
258 	unsigned long	siar;
259 	unsigned long	sdar;
260 	unsigned long	sier;
261 	unsigned long	mmcr2;
262 	unsigned 	mmcr0;
263 
264 	unsigned 	used_ebb;
265 	unsigned long   mmcr3;
266 	unsigned long   sier2;
267 	unsigned long   sier3;
268 
269 #endif
270 };
271 
272 #define ARCH_MIN_TASKALIGN 16
273 
274 #define INIT_SP		(sizeof(init_stack) + (unsigned long) &init_stack)
275 #define INIT_SP_LIMIT	((unsigned long)&init_stack)
276 
277 #ifdef CONFIG_SPE
278 #define SPEFSCR_INIT \
279 	.spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \
280 	.spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
281 #else
282 #define SPEFSCR_INIT
283 #endif
284 
285 #ifdef CONFIG_PPC_BOOK3S_32
286 #define SR0_INIT	.sr0 = IS_ENABLED(CONFIG_PPC_KUEP) ? SR_NX : 0,
287 #else
288 #define SR0_INIT
289 #endif
290 
291 #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP)
292 #define INIT_THREAD { \
293 	.ksp = INIT_SP, \
294 	.pgdir = swapper_pg_dir, \
295 	.kuap = ~0UL, /* KUAP_NONE */ \
296 	.fpexc_mode = MSR_FE0 | MSR_FE1, \
297 	SPEFSCR_INIT \
298 	SR0_INIT \
299 }
300 #elif defined(CONFIG_PPC32)
301 #define INIT_THREAD { \
302 	.ksp = INIT_SP, \
303 	.pgdir = swapper_pg_dir, \
304 	.fpexc_mode = MSR_FE0 | MSR_FE1, \
305 	SPEFSCR_INIT \
306 	SR0_INIT \
307 }
308 #else
309 #define INIT_THREAD  { \
310 	.ksp = INIT_SP, \
311 	.fpexc_mode = 0, \
312 }
313 #endif
314 
315 #define task_pt_regs(tsk)	((tsk)->thread.regs)
316 
317 unsigned long __get_wchan(struct task_struct *p);
318 
319 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
320 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
321 
322 /* Get/set floating-point exception mode */
323 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
324 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
325 
326 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
327 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
328 
329 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
330 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
331 
332 extern int get_endian(struct task_struct *tsk, unsigned long adr);
333 extern int set_endian(struct task_struct *tsk, unsigned int val);
334 
335 #define GET_UNALIGN_CTL(tsk, adr)	get_unalign_ctl((tsk), (adr))
336 #define SET_UNALIGN_CTL(tsk, val)	set_unalign_ctl((tsk), (val))
337 
338 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
339 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
340 
341 extern void load_fp_state(struct thread_fp_state *fp);
342 extern void store_fp_state(struct thread_fp_state *fp);
343 extern void load_vr_state(struct thread_vr_state *vr);
344 extern void store_vr_state(struct thread_vr_state *vr);
345 
346 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
347 {
348 	return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
349 }
350 
351 static inline unsigned long __pack_fe01(unsigned int fpmode)
352 {
353 	return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
354 }
355 
356 #ifdef CONFIG_PPC64
357 
358 #define spin_begin()	HMT_low()
359 
360 #define spin_cpu_relax()	barrier()
361 
362 #define spin_end()	HMT_medium()
363 
364 #endif
365 
366 /* Check that a certain kernel stack pointer is valid in task_struct p */
367 int validate_sp(unsigned long sp, struct task_struct *p,
368                        unsigned long nbytes);
369 
370 /*
371  * Prefetch macros.
372  */
373 #define ARCH_HAS_PREFETCH
374 #define ARCH_HAS_PREFETCHW
375 #define ARCH_HAS_SPINLOCK_PREFETCH
376 
377 static inline void prefetch(const void *x)
378 {
379 	if (unlikely(!x))
380 		return;
381 
382 	__asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
383 }
384 
385 static inline void prefetchw(const void *x)
386 {
387 	if (unlikely(!x))
388 		return;
389 
390 	__asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
391 }
392 
393 #define spin_lock_prefetch(x)	prefetchw(x)
394 
395 #define HAVE_ARCH_PICK_MMAP_LAYOUT
396 
397 /* asm stubs */
398 extern unsigned long isa300_idle_stop_noloss(unsigned long psscr_val);
399 extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val);
400 extern unsigned long isa206_idle_insn_mayloss(unsigned long type);
401 #ifdef CONFIG_PPC_970_NAP
402 extern void power4_idle_nap(void);
403 void power4_idle_nap_return(void);
404 #endif
405 
406 extern unsigned long cpuidle_disable;
407 enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
408 
409 extern int powersave_nap;	/* set if nap mode can be used in idle loop */
410 
411 extern void power7_idle_type(unsigned long type);
412 extern void arch300_idle_type(unsigned long stop_psscr_val,
413 			      unsigned long stop_psscr_mask);
414 
415 extern int fix_alignment(struct pt_regs *);
416 
417 #ifdef CONFIG_PPC64
418 /*
419  * We handle most unaligned accesses in hardware. On the other hand
420  * unaligned DMA can be very expensive on some ppc64 IO chips (it does
421  * powers of 2 writes until it reaches sufficient alignment).
422  *
423  * Based on this we disable the IP header alignment in network drivers.
424  */
425 #define NET_IP_ALIGN	0
426 #endif
427 
428 int do_mathemu(struct pt_regs *regs);
429 
430 #endif /* __KERNEL__ */
431 #endif /* __ASSEMBLY__ */
432 #endif /* _ASM_POWERPC_PROCESSOR_H */
433