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 
264 #endif
265 };
266 
267 #define ARCH_MIN_TASKALIGN 16
268 
269 #define INIT_SP		(sizeof(init_stack) + (unsigned long) &init_stack)
270 #define INIT_SP_LIMIT	((unsigned long)&init_stack)
271 
272 #ifdef CONFIG_SPE
273 #define SPEFSCR_INIT \
274 	.spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE, \
275 	.spefscr_last = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
276 #else
277 #define SPEFSCR_INIT
278 #endif
279 
280 #ifdef CONFIG_PPC_BOOK3S_32
281 #define SR0_INIT	.sr0 = IS_ENABLED(CONFIG_PPC_KUEP) ? SR_NX : 0,
282 #else
283 #define SR0_INIT
284 #endif
285 
286 #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP)
287 #define INIT_THREAD { \
288 	.ksp = INIT_SP, \
289 	.pgdir = swapper_pg_dir, \
290 	.kuap = ~0UL, /* KUAP_NONE */ \
291 	.fpexc_mode = MSR_FE0 | MSR_FE1, \
292 	SPEFSCR_INIT \
293 	SR0_INIT \
294 }
295 #elif defined(CONFIG_PPC32)
296 #define INIT_THREAD { \
297 	.ksp = INIT_SP, \
298 	.pgdir = swapper_pg_dir, \
299 	.fpexc_mode = MSR_FE0 | MSR_FE1, \
300 	SPEFSCR_INIT \
301 	SR0_INIT \
302 }
303 #else
304 #define INIT_THREAD  { \
305 	.ksp = INIT_SP, \
306 	.fpexc_mode = 0, \
307 }
308 #endif
309 
310 #define task_pt_regs(tsk)	((tsk)->thread.regs)
311 
312 unsigned long __get_wchan(struct task_struct *p);
313 
314 #define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
315 #define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
316 
317 /* Get/set floating-point exception mode */
318 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
319 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
320 
321 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
322 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
323 
324 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
325 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
326 
327 extern int get_endian(struct task_struct *tsk, unsigned long adr);
328 extern int set_endian(struct task_struct *tsk, unsigned int val);
329 
330 #define GET_UNALIGN_CTL(tsk, adr)	get_unalign_ctl((tsk), (adr))
331 #define SET_UNALIGN_CTL(tsk, val)	set_unalign_ctl((tsk), (val))
332 
333 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
334 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
335 
336 extern void load_fp_state(struct thread_fp_state *fp);
337 extern void store_fp_state(struct thread_fp_state *fp);
338 extern void load_vr_state(struct thread_vr_state *vr);
339 extern void store_vr_state(struct thread_vr_state *vr);
340 
__unpack_fe01(unsigned long msr_bits)341 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
342 {
343 	return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
344 }
345 
__pack_fe01(unsigned int fpmode)346 static inline unsigned long __pack_fe01(unsigned int fpmode)
347 {
348 	return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
349 }
350 
351 #ifdef CONFIG_PPC64
352 
353 #define spin_begin()							\
354 	asm volatile(ASM_FTR_IFCLR(					\
355 		"or 1,1,1", /* HMT_LOW */				\
356 		"nop", /* v3.1 uses pause_short in cpu_relax instead */	\
357 		%0) :: "i" (CPU_FTR_ARCH_31) : "memory")
358 
359 #define spin_cpu_relax()						\
360 	asm volatile(ASM_FTR_IFCLR(					\
361 		"nop", /* Before v3.1 use priority nops in spin_begin/end */ \
362 		PPC_WAIT(2, 0),	/* aka pause_short */			\
363 		%0) :: "i" (CPU_FTR_ARCH_31) : "memory")
364 
365 #define spin_end()							\
366 	asm volatile(ASM_FTR_IFCLR(					\
367 		"or 2,2,2", /* HMT_MEDIUM */				\
368 		"nop",							\
369 		%0) :: "i" (CPU_FTR_ARCH_31) : "memory")
370 
371 #endif
372 
373 /*
374  * Check that a certain kernel stack pointer is a valid (minimum sized)
375  * stack frame in task_struct p.
376  */
377 int validate_sp(unsigned long sp, struct task_struct *p);
378 
379 /*
380  * validate the stack frame of a particular minimum size, used for when we are
381  * looking at a certain object in the stack beyond the minimum.
382  */
383 int validate_sp_size(unsigned long sp, struct task_struct *p,
384 		     unsigned long nbytes);
385 
386 /*
387  * Prefetch macros.
388  */
389 #define ARCH_HAS_PREFETCH
390 #define ARCH_HAS_PREFETCHW
391 
prefetch(const void * x)392 static inline void prefetch(const void *x)
393 {
394 	if (unlikely(!x))
395 		return;
396 
397 	__asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
398 }
399 
prefetchw(const void * x)400 static inline void prefetchw(const void *x)
401 {
402 	if (unlikely(!x))
403 		return;
404 
405 	__asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
406 }
407 
408 /* asm stubs */
409 extern unsigned long isa300_idle_stop_noloss(unsigned long psscr_val);
410 extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val);
411 extern unsigned long isa206_idle_insn_mayloss(unsigned long type);
412 #ifdef CONFIG_PPC_970_NAP
413 extern void power4_idle_nap(void);
414 void power4_idle_nap_return(void);
415 #endif
416 
417 extern unsigned long cpuidle_disable;
418 enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
419 
420 extern int powersave_nap;	/* set if nap mode can be used in idle loop */
421 
422 extern void power7_idle_type(unsigned long type);
423 extern void arch300_idle_type(unsigned long stop_psscr_val,
424 			      unsigned long stop_psscr_mask);
425 void pnv_power9_force_smt4_catch(void);
426 void pnv_power9_force_smt4_release(void);
427 
428 extern int fix_alignment(struct pt_regs *);
429 
430 #ifdef CONFIG_PPC64
431 /*
432  * We handle most unaligned accesses in hardware. On the other hand
433  * unaligned DMA can be very expensive on some ppc64 IO chips (it does
434  * powers of 2 writes until it reaches sufficient alignment).
435  *
436  * Based on this we disable the IP header alignment in network drivers.
437  */
438 #define NET_IP_ALIGN	0
439 #endif
440 
441 int do_mathemu(struct pt_regs *regs);
442 int do_spe_mathemu(struct pt_regs *regs);
443 int speround_handler(struct pt_regs *regs);
444 
445 /* VMX copying */
446 int enter_vmx_usercopy(void);
447 int exit_vmx_usercopy(void);
448 int enter_vmx_ops(void);
449 void *exit_vmx_ops(void *dest);
450 
451 #endif /* __KERNEL__ */
452 #endif /* __ASSEMBLY__ */
453 #endif /* _ASM_POWERPC_PROCESSOR_H */
454