1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * include/asm-parisc/processor.h
4 *
5 * Copyright (C) 1994 Linus Torvalds
6 * Copyright (C) 2001 Grant Grundler
7 */
8
9 #ifndef __ASM_PARISC_PROCESSOR_H
10 #define __ASM_PARISC_PROCESSOR_H
11
12 #ifndef __ASSEMBLY__
13 #include <linux/threads.h>
14
15 #include <asm/prefetch.h>
16 #include <asm/hardware.h>
17 #include <asm/pdc.h>
18 #include <asm/ptrace.h>
19 #include <asm/types.h>
20 #include <asm/percpu.h>
21 #endif /* __ASSEMBLY__ */
22
23 /*
24 * Default implementation of macro that returns current
25 * instruction pointer ("program counter").
26 */
27 #ifdef CONFIG_PA20
28 #define current_ia(x) __asm__("mfia %0" : "=r"(x))
29 #else /* mfia added in pa2.0 */
30 #define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x))
31 #endif
32 #define current_text_addr() ({ void *pc; current_ia(pc); pc; })
33
34 #define HAVE_ARCH_PICK_MMAP_LAYOUT
35
36 #define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
37 #define TASK_SIZE TASK_SIZE_OF(current)
38 #define TASK_UNMAPPED_BASE (current->thread.map_base)
39
40 #define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
41 #define DEFAULT_MAP_BASE32 (0x40000000UL)
42
43 #ifdef CONFIG_64BIT
44 #define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
45 #define DEFAULT_MAP_BASE (0x200000000UL)
46 #else
47 #define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
48 #define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
49 #endif
50
51 #ifdef __KERNEL__
52
53 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
54 * prumpf */
55
56 #define STACK_TOP TASK_SIZE
57 #define STACK_TOP_MAX DEFAULT_TASK_SIZE
58
59 /* Allow bigger stacks for 64-bit processes */
60 #define STACK_SIZE_MAX (USER_WIDE_MODE \
61 ? (1 << 30) /* 1 GB */ \
62 : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))
63
64 #endif
65
66 #ifndef __ASSEMBLY__
67
68 /*
69 * Data detected about CPUs at boot time which is the same for all CPU's.
70 * HP boxes are SMP - ie identical processors.
71 *
72 * FIXME: some CPU rev info may be processor specific...
73 */
74 struct system_cpuinfo_parisc {
75 unsigned int cpu_count;
76 unsigned int cpu_hz;
77 unsigned int hversion;
78 unsigned int sversion;
79 enum cpu_type cpu_type;
80
81 struct {
82 struct pdc_model model;
83 unsigned long versions;
84 unsigned long cpuid;
85 unsigned long capabilities;
86 char sys_model_name[81]; /* PDC-ROM returnes this model name */
87 } pdc;
88
89 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */
90 const char *family_name; /* e.g. "1.1e" */
91 };
92
93
94 /* Per CPU data structure - ie varies per CPU. */
95 struct cpuinfo_parisc {
96 unsigned long it_value; /* Interval Timer at last timer Intr */
97 unsigned long irq_count; /* number of IRQ's since boot */
98 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
99 unsigned long hpa; /* Host Physical address */
100 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
101 #ifdef CONFIG_SMP
102 unsigned long pending_ipi; /* bitmap of type ipi_message_type */
103 #endif
104 unsigned long bh_count; /* number of times bh was invoked */
105 unsigned long fp_rev;
106 unsigned long fp_model;
107 unsigned long cpu_num; /* CPU number from PAT firmware */
108 unsigned long cpu_loc; /* CPU location from PAT firmware */
109 unsigned int state;
110 struct parisc_device *dev;
111 unsigned long loops_per_jiffy;
112 };
113
114 extern struct system_cpuinfo_parisc boot_cpu_data;
115 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
116
117 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
118
119 typedef struct {
120 int seg;
121 } mm_segment_t;
122
123 #define ARCH_MIN_TASKALIGN 8
124
125 struct thread_struct {
126 struct pt_regs regs;
127 unsigned long task_size;
128 unsigned long map_base;
129 unsigned long flags;
130 };
131
132 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
133
134 /* Thread struct flags. */
135 #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
136 #define PARISC_UAC_SIGBUS (1UL << 1)
137 #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
138
139 #define PARISC_UAC_SHIFT 0
140 #define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
141
142 #define SET_UNALIGN_CTL(task,value) \
143 ({ \
144 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
145 | (((value) << PARISC_UAC_SHIFT) & \
146 PARISC_UAC_MASK)); \
147 0; \
148 })
149
150 #define GET_UNALIGN_CTL(task,addr) \
151 ({ \
152 put_user(((task)->thread.flags & PARISC_UAC_MASK) \
153 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \
154 })
155
156 #define INIT_THREAD { \
157 .regs = { .gr = { 0, }, \
158 .fr = { 0, }, \
159 .sr = { 0, }, \
160 .iasq = { 0, }, \
161 .iaoq = { 0, }, \
162 .cr27 = 0, \
163 }, \
164 .task_size = DEFAULT_TASK_SIZE, \
165 .map_base = DEFAULT_MAP_BASE, \
166 .flags = 0 \
167 }
168
169 struct task_struct;
170 void show_trace(struct task_struct *task, unsigned long *stack);
171
172 /*
173 * Start user thread in another space.
174 *
175 * Note that we set both the iaoq and r31 to the new pc. When
176 * the kernel initially calls execve it will return through an
177 * rfi path that will use the values in the iaoq. The execve
178 * syscall path will return through the gateway page, and
179 * that uses r31 to branch to.
180 *
181 * For ELF we clear r23, because the dynamic linker uses it to pass
182 * the address of the finalizer function.
183 *
184 * We also initialize sr3 to an illegal value (illegal for our
185 * implementation, not for the architecture).
186 */
187 typedef unsigned int elf_caddr_t;
188
189 /* The ELF abi wants things done a "wee bit" differently than
190 * som does. Supporting this behavior here avoids
191 * having our own version of create_elf_tables.
192 *
193 * Oh, and yes, that is not a typo, we are really passing argc in r25
194 * and argv in r24 (rather than r26 and r25). This is because that's
195 * where __libc_start_main wants them.
196 *
197 * Duplicated from dl-machine.h for the benefit of readers:
198 *
199 * Our initial stack layout is rather different from everyone else's
200 * due to the unique PA-RISC ABI. As far as I know it looks like
201 * this:
202
203 ----------------------------------- (user startup code creates this frame)
204 | 32 bytes of magic |
205 |---------------------------------|
206 | 32 bytes argument/sp save area |
207 |---------------------------------| (bprm->p)
208 | ELF auxiliary info |
209 | (up to 28 words) |
210 |---------------------------------|
211 | NULL |
212 |---------------------------------|
213 | Environment pointers |
214 |---------------------------------|
215 | NULL |
216 |---------------------------------|
217 | Argument pointers |
218 |---------------------------------| <- argv
219 | argc (1 word) |
220 |---------------------------------| <- bprm->exec (HACK!)
221 | N bytes of slack |
222 |---------------------------------|
223 | filename passed to execve |
224 |---------------------------------| (mm->env_end)
225 | env strings |
226 |---------------------------------| (mm->env_start, mm->arg_end)
227 | arg strings |
228 |---------------------------------|
229 | additional faked arg strings if |
230 | we're invoked via binfmt_script |
231 |---------------------------------| (mm->arg_start)
232 stack base is at TASK_SIZE - rlim_max.
233
234 on downward growing arches, it looks like this:
235 stack base at TASK_SIZE
236 | filename passed to execve
237 | env strings
238 | arg strings
239 | faked arg strings
240 | slack
241 | ELF
242 | envps
243 | argvs
244 | argc
245
246 * The pleasant part of this is that if we need to skip arguments we
247 * can just decrement argc and move argv, because the stack pointer
248 * is utterly unrelated to the location of the environment and
249 * argument vectors.
250 *
251 * Note that the S/390 people took the easy way out and hacked their
252 * GCC to make the stack grow downwards.
253 *
254 * Final Note: For entry from syscall, the W (wide) bit of the PSW
255 * is stuffed into the lowest bit of the user sp (%r30), so we fill
256 * it in here from the current->personality
257 */
258
259 #ifdef CONFIG_64BIT
260 #define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
261 #else
262 #define USER_WIDE_MODE 0
263 #endif
264
265 #define start_thread(regs, new_pc, new_sp) do { \
266 elf_addr_t *sp = (elf_addr_t *)new_sp; \
267 __u32 spaceid = (__u32)current->mm->context; \
268 elf_addr_t pc = (elf_addr_t)new_pc | 3; \
269 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
270 \
271 regs->iasq[0] = spaceid; \
272 regs->iasq[1] = spaceid; \
273 regs->iaoq[0] = pc; \
274 regs->iaoq[1] = pc + 4; \
275 regs->sr[2] = LINUX_GATEWAY_SPACE; \
276 regs->sr[3] = 0xffff; \
277 regs->sr[4] = spaceid; \
278 regs->sr[5] = spaceid; \
279 regs->sr[6] = spaceid; \
280 regs->sr[7] = spaceid; \
281 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
282 regs->fr[ 0] = 0LL; \
283 regs->fr[ 1] = 0LL; \
284 regs->fr[ 2] = 0LL; \
285 regs->fr[ 3] = 0LL; \
286 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
287 regs->gr[31] = pc; \
288 \
289 get_user(regs->gr[25], (argv - 1)); \
290 regs->gr[24] = (long) argv; \
291 regs->gr[23] = 0; \
292 } while(0)
293
294 struct task_struct;
295 struct mm_struct;
296
297 /* Free all resources held by a thread. */
298 extern void release_thread(struct task_struct *);
299
300 extern unsigned long get_wchan(struct task_struct *p);
301
302 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
303 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
304
305 #define cpu_relax() barrier()
306
307 /*
308 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
309 * cached CPUs which require a guarantee of coherency (no inequivalent aliases
310 * with different data, whether clean or not) to operate
311 */
312 #ifdef CONFIG_PA8X00
313 extern int _parisc_requires_coherency;
314 #define parisc_requires_coherency() _parisc_requires_coherency
315 #else
316 #define parisc_requires_coherency() (0)
317 #endif
318
319 extern int running_on_qemu;
320
321 #endif /* __ASSEMBLY__ */
322
323 #endif /* __ASM_PARISC_PROCESSOR_H */
324
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