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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * include/asm/processor.h
4 *
5 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8#ifndef __ASM_SPARC64_PROCESSOR_H
9#define __ASM_SPARC64_PROCESSOR_H
10
11/*
12 * Sparc64 implementation of macro that returns current
13 * instruction pointer ("program counter").
14 */
15#define current_text_addr() ({ void *pc; __asm__("rd %%pc, %0" : "=r" (pc)); pc; })
16
17#include <asm/asi.h>
18#include <asm/pstate.h>
19#include <asm/ptrace.h>
20#include <asm/page.h>
21
22/*
23 * User lives in his very own context, and cannot reference us. Note
24 * that TASK_SIZE is a misnomer, it really gives maximum user virtual
25 * address that the kernel will allocate out.
26 *
27 * XXX No longer using virtual page tables, kill this upper limit...
28 */
29#define VA_BITS 44
30#ifndef __ASSEMBLY__
31#define VPTE_SIZE (1UL << (VA_BITS - PAGE_SHIFT + 3))
32#else
33#define VPTE_SIZE (1 << (VA_BITS - PAGE_SHIFT + 3))
34#endif
35
36#define TASK_SIZE_OF(tsk) \
37 (test_tsk_thread_flag(tsk,TIF_32BIT) ? \
38 (1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
39#define TASK_SIZE \
40 (test_thread_flag(TIF_32BIT) ? \
41 (1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
42#ifdef __KERNEL__
43
44#define STACK_TOP32 ((1UL << 32UL) - PAGE_SIZE)
45#define STACK_TOP64 (0x0000080000000000UL - (1UL << 32UL))
46
47#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
48 STACK_TOP32 : STACK_TOP64)
49
50#define STACK_TOP_MAX STACK_TOP64
51
52#endif
53
54#ifndef __ASSEMBLY__
55
56typedef struct {
57 unsigned char seg;
58} mm_segment_t;
59
60/* The Sparc processor specific thread struct. */
61/* XXX This should die, everything can go into thread_info now. */
62struct thread_struct {
63#ifdef CONFIG_DEBUG_SPINLOCK
64 /* How many spinlocks held by this thread.
65 * Used with spin lock debugging to catch tasks
66 * sleeping illegally with locks held.
67 */
68 int smp_lock_count;
69 unsigned int smp_lock_pc;
70#else
71 int dummy; /* f'in gcc bug... */
72#endif
73};
74
75#endif /* !(__ASSEMBLY__) */
76
77#ifndef CONFIG_DEBUG_SPINLOCK
78#define INIT_THREAD { \
79 0, \
80}
81#else /* CONFIG_DEBUG_SPINLOCK */
82#define INIT_THREAD { \
83/* smp_lock_count, smp_lock_pc, */ \
84 0, 0, \
85}
86#endif /* !(CONFIG_DEBUG_SPINLOCK) */
87
88#ifndef __ASSEMBLY__
89
90#include <linux/types.h>
91#include <asm/fpumacro.h>
92
93struct task_struct;
94
95/* On Uniprocessor, even in RMO processes see TSO semantics */
96#ifdef CONFIG_SMP
97#define TSTATE_INITIAL_MM TSTATE_TSO
98#else
99#define TSTATE_INITIAL_MM TSTATE_RMO
100#endif
101
102/* Do necessary setup to start up a newly executed thread. */
103#define start_thread(regs, pc, sp) \
104do { \
105 unsigned long __asi = ASI_PNF; \
106 regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \
107 regs->tpc = ((pc & (~3)) - 4); \
108 regs->tnpc = regs->tpc + 4; \
109 regs->y = 0; \
110 set_thread_wstate(1 << 3); \
111 if (current_thread_info()->utraps) { \
112 if (*(current_thread_info()->utraps) < 2) \
113 kfree(current_thread_info()->utraps); \
114 else \
115 (*(current_thread_info()->utraps))--; \
116 current_thread_info()->utraps = NULL; \
117 } \
118 __asm__ __volatile__( \
119 "stx %%g0, [%0 + %2 + 0x00]\n\t" \
120 "stx %%g0, [%0 + %2 + 0x08]\n\t" \
121 "stx %%g0, [%0 + %2 + 0x10]\n\t" \
122 "stx %%g0, [%0 + %2 + 0x18]\n\t" \
123 "stx %%g0, [%0 + %2 + 0x20]\n\t" \
124 "stx %%g0, [%0 + %2 + 0x28]\n\t" \
125 "stx %%g0, [%0 + %2 + 0x30]\n\t" \
126 "stx %%g0, [%0 + %2 + 0x38]\n\t" \
127 "stx %%g0, [%0 + %2 + 0x40]\n\t" \
128 "stx %%g0, [%0 + %2 + 0x48]\n\t" \
129 "stx %%g0, [%0 + %2 + 0x50]\n\t" \
130 "stx %%g0, [%0 + %2 + 0x58]\n\t" \
131 "stx %%g0, [%0 + %2 + 0x60]\n\t" \
132 "stx %%g0, [%0 + %2 + 0x68]\n\t" \
133 "stx %1, [%0 + %2 + 0x70]\n\t" \
134 "stx %%g0, [%0 + %2 + 0x78]\n\t" \
135 "wrpr %%g0, (1 << 3), %%wstate\n\t" \
136 : \
137 : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
138 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
139 fprs_write(0); \
140 current_thread_info()->xfsr[0] = 0; \
141 current_thread_info()->fpsaved[0] = 0; \
142 regs->tstate &= ~TSTATE_PEF; \
143} while (0)
144
145#define start_thread32(regs, pc, sp) \
146do { \
147 unsigned long __asi = ASI_PNF; \
148 pc &= 0x00000000ffffffffUL; \
149 sp &= 0x00000000ffffffffUL; \
150 regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \
151 regs->tpc = ((pc & (~3)) - 4); \
152 regs->tnpc = regs->tpc + 4; \
153 regs->y = 0; \
154 set_thread_wstate(2 << 3); \
155 if (current_thread_info()->utraps) { \
156 if (*(current_thread_info()->utraps) < 2) \
157 kfree(current_thread_info()->utraps); \
158 else \
159 (*(current_thread_info()->utraps))--; \
160 current_thread_info()->utraps = NULL; \
161 } \
162 __asm__ __volatile__( \
163 "stx %%g0, [%0 + %2 + 0x00]\n\t" \
164 "stx %%g0, [%0 + %2 + 0x08]\n\t" \
165 "stx %%g0, [%0 + %2 + 0x10]\n\t" \
166 "stx %%g0, [%0 + %2 + 0x18]\n\t" \
167 "stx %%g0, [%0 + %2 + 0x20]\n\t" \
168 "stx %%g0, [%0 + %2 + 0x28]\n\t" \
169 "stx %%g0, [%0 + %2 + 0x30]\n\t" \
170 "stx %%g0, [%0 + %2 + 0x38]\n\t" \
171 "stx %%g0, [%0 + %2 + 0x40]\n\t" \
172 "stx %%g0, [%0 + %2 + 0x48]\n\t" \
173 "stx %%g0, [%0 + %2 + 0x50]\n\t" \
174 "stx %%g0, [%0 + %2 + 0x58]\n\t" \
175 "stx %%g0, [%0 + %2 + 0x60]\n\t" \
176 "stx %%g0, [%0 + %2 + 0x68]\n\t" \
177 "stx %1, [%0 + %2 + 0x70]\n\t" \
178 "stx %%g0, [%0 + %2 + 0x78]\n\t" \
179 "wrpr %%g0, (2 << 3), %%wstate\n\t" \
180 : \
181 : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \
182 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
183 fprs_write(0); \
184 current_thread_info()->xfsr[0] = 0; \
185 current_thread_info()->fpsaved[0] = 0; \
186 regs->tstate &= ~TSTATE_PEF; \
187} while (0)
188
189/* Free all resources held by a thread. */
190#define release_thread(tsk) do { } while (0)
191
192unsigned long get_wchan(struct task_struct *task);
193
194#define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)
195#define KSTK_EIP(tsk) (task_pt_regs(tsk)->tpc)
196#define KSTK_ESP(tsk) (task_pt_regs(tsk)->u_regs[UREG_FP])
197
198/* Please see the commentary in asm/backoff.h for a description of
199 * what these instructions are doing and how they have been chosen.
200 * To make a long story short, we are trying to yield the current cpu
201 * strand during busy loops.
202 */
203#ifdef BUILD_VDSO
204#define cpu_relax() asm volatile("\n99:\n\t" \
205 "rd %%ccr, %%g0\n\t" \
206 "rd %%ccr, %%g0\n\t" \
207 "rd %%ccr, %%g0\n\t" \
208 ::: "memory")
209#else /* ! BUILD_VDSO */
210#define cpu_relax() asm volatile("\n99:\n\t" \
211 "rd %%ccr, %%g0\n\t" \
212 "rd %%ccr, %%g0\n\t" \
213 "rd %%ccr, %%g0\n\t" \
214 ".section .pause_3insn_patch,\"ax\"\n\t"\
215 ".word 99b\n\t" \
216 "wr %%g0, 128, %%asr27\n\t" \
217 "nop\n\t" \
218 "nop\n\t" \
219 ".previous" \
220 ::: "memory")
221#endif
222
223/* Prefetch support. This is tuned for UltraSPARC-III and later.
224 * UltraSPARC-I will treat these as nops, and UltraSPARC-II has
225 * a shallower prefetch queue than later chips.
226 */
227#define ARCH_HAS_PREFETCH
228#define ARCH_HAS_PREFETCHW
229#define ARCH_HAS_SPINLOCK_PREFETCH
230
231static inline void prefetch(const void *x)
232{
233 /* We do not use the read prefetch mnemonic because that
234 * prefetches into the prefetch-cache which only is accessible
235 * by floating point operations in UltraSPARC-III and later.
236 * By contrast, "#one_write" prefetches into the L2 cache
237 * in shared state.
238 */
239 __asm__ __volatile__("prefetch [%0], #one_write"
240 : /* no outputs */
241 : "r" (x));
242}
243
244static inline void prefetchw(const void *x)
245{
246 /* The most optimal prefetch to use for writes is
247 * "#n_writes". This brings the cacheline into the
248 * L2 cache in "owned" state.
249 */
250 __asm__ __volatile__("prefetch [%0], #n_writes"
251 : /* no outputs */
252 : "r" (x));
253}
254
255#define spin_lock_prefetch(x) prefetchw(x)
256
257#define HAVE_ARCH_PICK_MMAP_LAYOUT
258
259int do_mathemu(struct pt_regs *regs, struct fpustate *f, bool illegal_insn_trap);
260
261#endif /* !(__ASSEMBLY__) */
262
263#endif /* !(__ASM_SPARC64_PROCESSOR_H) */
1/*
2 * include/asm/processor.h
3 *
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 */
6
7#ifndef __ASM_SPARC64_PROCESSOR_H
8#define __ASM_SPARC64_PROCESSOR_H
9
10/*
11 * Sparc64 implementation of macro that returns current
12 * instruction pointer ("program counter").
13 */
14#define current_text_addr() ({ void *pc; __asm__("rd %%pc, %0" : "=r" (pc)); pc; })
15
16#include <asm/asi.h>
17#include <asm/pstate.h>
18#include <asm/ptrace.h>
19#include <asm/page.h>
20
21/* Don't hold the runqueue lock over context switch */
22#define __ARCH_WANT_UNLOCKED_CTXSW
23
24/* The sparc has no problems with write protection */
25#define wp_works_ok 1
26#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
27
28/*
29 * User lives in his very own context, and cannot reference us. Note
30 * that TASK_SIZE is a misnomer, it really gives maximum user virtual
31 * address that the kernel will allocate out.
32 *
33 * XXX No longer using virtual page tables, kill this upper limit...
34 */
35#define VA_BITS 44
36#ifndef __ASSEMBLY__
37#define VPTE_SIZE (1UL << (VA_BITS - PAGE_SHIFT + 3))
38#else
39#define VPTE_SIZE (1 << (VA_BITS - PAGE_SHIFT + 3))
40#endif
41
42#define TASK_SIZE_OF(tsk) \
43 (test_tsk_thread_flag(tsk,TIF_32BIT) ? \
44 (1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
45#define TASK_SIZE \
46 (test_thread_flag(TIF_32BIT) ? \
47 (1UL << 32UL) : ((unsigned long)-VPTE_SIZE))
48#ifdef __KERNEL__
49
50#define STACK_TOP32 ((1UL << 32UL) - PAGE_SIZE)
51#define STACK_TOP64 (0x0000080000000000UL - (1UL << 32UL))
52
53#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
54 STACK_TOP32 : STACK_TOP64)
55
56#define STACK_TOP_MAX STACK_TOP64
57
58#endif
59
60#ifndef __ASSEMBLY__
61
62typedef struct {
63 unsigned char seg;
64} mm_segment_t;
65
66/* The Sparc processor specific thread struct. */
67/* XXX This should die, everything can go into thread_info now. */
68struct thread_struct {
69#ifdef CONFIG_DEBUG_SPINLOCK
70 /* How many spinlocks held by this thread.
71 * Used with spin lock debugging to catch tasks
72 * sleeping illegally with locks held.
73 */
74 int smp_lock_count;
75 unsigned int smp_lock_pc;
76#else
77 int dummy; /* f'in gcc bug... */
78#endif
79};
80
81#endif /* !(__ASSEMBLY__) */
82
83#ifndef CONFIG_DEBUG_SPINLOCK
84#define INIT_THREAD { \
85 0, \
86}
87#else /* CONFIG_DEBUG_SPINLOCK */
88#define INIT_THREAD { \
89/* smp_lock_count, smp_lock_pc, */ \
90 0, 0, \
91}
92#endif /* !(CONFIG_DEBUG_SPINLOCK) */
93
94#ifndef __ASSEMBLY__
95
96#include <linux/types.h>
97
98/* Return saved PC of a blocked thread. */
99struct task_struct;
100extern unsigned long thread_saved_pc(struct task_struct *);
101
102/* On Uniprocessor, even in RMO processes see TSO semantics */
103#ifdef CONFIG_SMP
104#define TSTATE_INITIAL_MM TSTATE_TSO
105#else
106#define TSTATE_INITIAL_MM TSTATE_RMO
107#endif
108
109/* Do necessary setup to start up a newly executed thread. */
110#define start_thread(regs, pc, sp) \
111do { \
112 unsigned long __asi = ASI_PNF; \
113 regs->tstate = (regs->tstate & (TSTATE_CWP)) | (TSTATE_INITIAL_MM|TSTATE_IE) | (__asi << 24UL); \
114 regs->tpc = ((pc & (~3)) - 4); \
115 regs->tnpc = regs->tpc + 4; \
116 regs->y = 0; \
117 set_thread_wstate(1 << 3); \
118 if (current_thread_info()->utraps) { \
119 if (*(current_thread_info()->utraps) < 2) \
120 kfree(current_thread_info()->utraps); \
121 else \
122 (*(current_thread_info()->utraps))--; \
123 current_thread_info()->utraps = NULL; \
124 } \
125 __asm__ __volatile__( \
126 "stx %%g0, [%0 + %2 + 0x00]\n\t" \
127 "stx %%g0, [%0 + %2 + 0x08]\n\t" \
128 "stx %%g0, [%0 + %2 + 0x10]\n\t" \
129 "stx %%g0, [%0 + %2 + 0x18]\n\t" \
130 "stx %%g0, [%0 + %2 + 0x20]\n\t" \
131 "stx %%g0, [%0 + %2 + 0x28]\n\t" \
132 "stx %%g0, [%0 + %2 + 0x30]\n\t" \
133 "stx %%g0, [%0 + %2 + 0x38]\n\t" \
134 "stx %%g0, [%0 + %2 + 0x40]\n\t" \
135 "stx %%g0, [%0 + %2 + 0x48]\n\t" \
136 "stx %%g0, [%0 + %2 + 0x50]\n\t" \
137 "stx %%g0, [%0 + %2 + 0x58]\n\t" \
138 "stx %%g0, [%0 + %2 + 0x60]\n\t" \
139 "stx %%g0, [%0 + %2 + 0x68]\n\t" \
140 "stx %1, [%0 + %2 + 0x70]\n\t" \
141 "stx %%g0, [%0 + %2 + 0x78]\n\t" \
142 "wrpr %%g0, (1 << 3), %%wstate\n\t" \
143 : \
144 : "r" (regs), "r" (sp - sizeof(struct reg_window) - STACK_BIAS), \
145 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
146} while (0)
147
148#define start_thread32(regs, pc, sp) \
149do { \
150 unsigned long __asi = ASI_PNF; \
151 pc &= 0x00000000ffffffffUL; \
152 sp &= 0x00000000ffffffffUL; \
153 regs->tstate = (regs->tstate & (TSTATE_CWP))|(TSTATE_INITIAL_MM|TSTATE_IE|TSTATE_AM) | (__asi << 24UL); \
154 regs->tpc = ((pc & (~3)) - 4); \
155 regs->tnpc = regs->tpc + 4; \
156 regs->y = 0; \
157 set_thread_wstate(2 << 3); \
158 if (current_thread_info()->utraps) { \
159 if (*(current_thread_info()->utraps) < 2) \
160 kfree(current_thread_info()->utraps); \
161 else \
162 (*(current_thread_info()->utraps))--; \
163 current_thread_info()->utraps = NULL; \
164 } \
165 __asm__ __volatile__( \
166 "stx %%g0, [%0 + %2 + 0x00]\n\t" \
167 "stx %%g0, [%0 + %2 + 0x08]\n\t" \
168 "stx %%g0, [%0 + %2 + 0x10]\n\t" \
169 "stx %%g0, [%0 + %2 + 0x18]\n\t" \
170 "stx %%g0, [%0 + %2 + 0x20]\n\t" \
171 "stx %%g0, [%0 + %2 + 0x28]\n\t" \
172 "stx %%g0, [%0 + %2 + 0x30]\n\t" \
173 "stx %%g0, [%0 + %2 + 0x38]\n\t" \
174 "stx %%g0, [%0 + %2 + 0x40]\n\t" \
175 "stx %%g0, [%0 + %2 + 0x48]\n\t" \
176 "stx %%g0, [%0 + %2 + 0x50]\n\t" \
177 "stx %%g0, [%0 + %2 + 0x58]\n\t" \
178 "stx %%g0, [%0 + %2 + 0x60]\n\t" \
179 "stx %%g0, [%0 + %2 + 0x68]\n\t" \
180 "stx %1, [%0 + %2 + 0x70]\n\t" \
181 "stx %%g0, [%0 + %2 + 0x78]\n\t" \
182 "wrpr %%g0, (2 << 3), %%wstate\n\t" \
183 : \
184 : "r" (regs), "r" (sp - sizeof(struct reg_window32)), \
185 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))); \
186} while (0)
187
188/* Free all resources held by a thread. */
189#define release_thread(tsk) do { } while (0)
190
191extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
192
193extern unsigned long get_wchan(struct task_struct *task);
194
195#define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)
196#define KSTK_EIP(tsk) (task_pt_regs(tsk)->tpc)
197#define KSTK_ESP(tsk) (task_pt_regs(tsk)->u_regs[UREG_FP])
198
199#define cpu_relax() barrier()
200
201/* Prefetch support. This is tuned for UltraSPARC-III and later.
202 * UltraSPARC-I will treat these as nops, and UltraSPARC-II has
203 * a shallower prefetch queue than later chips.
204 */
205#define ARCH_HAS_PREFETCH
206#define ARCH_HAS_PREFETCHW
207#define ARCH_HAS_SPINLOCK_PREFETCH
208
209static inline void prefetch(const void *x)
210{
211 /* We do not use the read prefetch mnemonic because that
212 * prefetches into the prefetch-cache which only is accessible
213 * by floating point operations in UltraSPARC-III and later.
214 * By contrast, "#one_write" prefetches into the L2 cache
215 * in shared state.
216 */
217 __asm__ __volatile__("prefetch [%0], #one_write"
218 : /* no outputs */
219 : "r" (x));
220}
221
222static inline void prefetchw(const void *x)
223{
224 /* The most optimal prefetch to use for writes is
225 * "#n_writes". This brings the cacheline into the
226 * L2 cache in "owned" state.
227 */
228 __asm__ __volatile__("prefetch [%0], #n_writes"
229 : /* no outputs */
230 : "r" (x));
231}
232
233#define spin_lock_prefetch(x) prefetchw(x)
234
235#define HAVE_ARCH_PICK_MMAP_LAYOUT
236
237#endif /* !(__ASSEMBLY__) */
238
239#endif /* !(__ASM_SPARC64_PROCESSOR_H) */