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 #define HAVE_ARCH_PICK_MMAP_LAYOUT
24
25 #define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
26 #define TASK_SIZE TASK_SIZE_OF(current)
27 #define TASK_UNMAPPED_BASE (current->thread.map_base)
28
29 #define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
30 #define DEFAULT_MAP_BASE32 (0x40000000UL)
31
32 #ifdef CONFIG_64BIT
33 #define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
34 #define DEFAULT_MAP_BASE (0x200000000UL)
35 #else
36 #define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
37 #define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
38 #endif
39
40 #ifdef __KERNEL__
41
42 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
43 * prumpf */
44
45 #define STACK_TOP TASK_SIZE
46 #define STACK_TOP_MAX DEFAULT_TASK_SIZE
47
48 /* Allow bigger stacks for 64-bit processes */
49 #define STACK_SIZE_MAX (USER_WIDE_MODE \
50 ? (1 << 30) /* 1 GB */ \
51 : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))
52
53 #endif
54
55 #ifndef __ASSEMBLY__
56
57 /*
58 * Data detected about CPUs at boot time which is the same for all CPU's.
59 * HP boxes are SMP - ie identical processors.
60 *
61 * FIXME: some CPU rev info may be processor specific...
62 */
63 struct system_cpuinfo_parisc {
64 unsigned int cpu_count;
65 unsigned int cpu_hz;
66 unsigned int hversion;
67 unsigned int sversion;
68 enum cpu_type cpu_type;
69
70 struct {
71 struct pdc_model model;
72 unsigned long versions;
73 unsigned long cpuid;
74 unsigned long capabilities;
75 char sys_model_name[81]; /* PDC-ROM returnes this model name */
76 } pdc;
77
78 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */
79 const char *family_name; /* e.g. "1.1e" */
80 };
81
82
83 /* Per CPU data structure - ie varies per CPU. */
84 struct cpuinfo_parisc {
85 unsigned long it_value; /* Interval Timer at last timer Intr */
86 unsigned long irq_count; /* number of IRQ's since boot */
87 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
88 unsigned long hpa; /* Host Physical address */
89 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
90 #ifdef CONFIG_SMP
91 unsigned long pending_ipi; /* bitmap of type ipi_message_type */
92 #endif
93 unsigned long bh_count; /* number of times bh was invoked */
94 unsigned long fp_rev;
95 unsigned long fp_model;
96 unsigned long cpu_num; /* CPU number from PAT firmware */
97 unsigned long cpu_loc; /* CPU location from PAT firmware */
98 unsigned int state;
99 struct parisc_device *dev;
100 unsigned long loops_per_jiffy;
101 };
102
103 extern struct system_cpuinfo_parisc boot_cpu_data;
104 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
105
106 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
107
108 typedef struct {
109 int seg;
110 } mm_segment_t;
111
112 #define ARCH_MIN_TASKALIGN 8
113
114 struct thread_struct {
115 struct pt_regs regs;
116 unsigned long task_size;
117 unsigned long map_base;
118 unsigned long flags;
119 };
120
121 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
122
123 /* Thread struct flags. */
124 #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
125 #define PARISC_UAC_SIGBUS (1UL << 1)
126 #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
127
128 #define PARISC_UAC_SHIFT 0
129 #define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
130
131 #define SET_UNALIGN_CTL(task,value) \
132 ({ \
133 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
134 | (((value) << PARISC_UAC_SHIFT) & \
135 PARISC_UAC_MASK)); \
136 0; \
137 })
138
139 #define GET_UNALIGN_CTL(task,addr) \
140 ({ \
141 put_user(((task)->thread.flags & PARISC_UAC_MASK) \
142 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \
143 })
144
145 #define INIT_THREAD { \
146 .regs = { .gr = { 0, }, \
147 .fr = { 0, }, \
148 .sr = { 0, }, \
149 .iasq = { 0, }, \
150 .iaoq = { 0, }, \
151 .cr27 = 0, \
152 }, \
153 .task_size = DEFAULT_TASK_SIZE, \
154 .map_base = DEFAULT_MAP_BASE, \
155 .flags = 0 \
156 }
157
158 struct task_struct;
159 void show_trace(struct task_struct *task, unsigned long *stack);
160
161 /*
162 * Start user thread in another space.
163 *
164 * Note that we set both the iaoq and r31 to the new pc. When
165 * the kernel initially calls execve it will return through an
166 * rfi path that will use the values in the iaoq. The execve
167 * syscall path will return through the gateway page, and
168 * that uses r31 to branch to.
169 *
170 * For ELF we clear r23, because the dynamic linker uses it to pass
171 * the address of the finalizer function.
172 *
173 * We also initialize sr3 to an illegal value (illegal for our
174 * implementation, not for the architecture).
175 */
176 typedef unsigned int elf_caddr_t;
177
178 /* The ELF abi wants things done a "wee bit" differently than
179 * som does. Supporting this behavior here avoids
180 * having our own version of create_elf_tables.
181 *
182 * Oh, and yes, that is not a typo, we are really passing argc in r25
183 * and argv in r24 (rather than r26 and r25). This is because that's
184 * where __libc_start_main wants them.
185 *
186 * Duplicated from dl-machine.h for the benefit of readers:
187 *
188 * Our initial stack layout is rather different from everyone else's
189 * due to the unique PA-RISC ABI. As far as I know it looks like
190 * this:
191
192 ----------------------------------- (user startup code creates this frame)
193 | 32 bytes of magic |
194 |---------------------------------|
195 | 32 bytes argument/sp save area |
196 |---------------------------------| (bprm->p)
197 | ELF auxiliary info |
198 | (up to 28 words) |
199 |---------------------------------|
200 | NULL |
201 |---------------------------------|
202 | Environment pointers |
203 |---------------------------------|
204 | NULL |
205 |---------------------------------|
206 | Argument pointers |
207 |---------------------------------| <- argv
208 | argc (1 word) |
209 |---------------------------------| <- bprm->exec (HACK!)
210 | N bytes of slack |
211 |---------------------------------|
212 | filename passed to execve |
213 |---------------------------------| (mm->env_end)
214 | env strings |
215 |---------------------------------| (mm->env_start, mm->arg_end)
216 | arg strings |
217 |---------------------------------|
218 | additional faked arg strings if |
219 | we're invoked via binfmt_script |
220 |---------------------------------| (mm->arg_start)
221 stack base is at TASK_SIZE - rlim_max.
222
223 on downward growing arches, it looks like this:
224 stack base at TASK_SIZE
225 | filename passed to execve
226 | env strings
227 | arg strings
228 | faked arg strings
229 | slack
230 | ELF
231 | envps
232 | argvs
233 | argc
234
235 * The pleasant part of this is that if we need to skip arguments we
236 * can just decrement argc and move argv, because the stack pointer
237 * is utterly unrelated to the location of the environment and
238 * argument vectors.
239 *
240 * Note that the S/390 people took the easy way out and hacked their
241 * GCC to make the stack grow downwards.
242 *
243 * Final Note: For entry from syscall, the W (wide) bit of the PSW
244 * is stuffed into the lowest bit of the user sp (%r30), so we fill
245 * it in here from the current->personality
246 */
247
248 #define USER_WIDE_MODE (!is_32bit_task())
249
250 #define start_thread(regs, new_pc, new_sp) do { \
251 elf_addr_t *sp = (elf_addr_t *)new_sp; \
252 __u32 spaceid = (__u32)current->mm->context; \
253 elf_addr_t pc = (elf_addr_t)new_pc | 3; \
254 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
255 \
256 regs->iasq[0] = spaceid; \
257 regs->iasq[1] = spaceid; \
258 regs->iaoq[0] = pc; \
259 regs->iaoq[1] = pc + 4; \
260 regs->sr[2] = LINUX_GATEWAY_SPACE; \
261 regs->sr[3] = 0xffff; \
262 regs->sr[4] = spaceid; \
263 regs->sr[5] = spaceid; \
264 regs->sr[6] = spaceid; \
265 regs->sr[7] = spaceid; \
266 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
267 regs->fr[ 0] = 0LL; \
268 regs->fr[ 1] = 0LL; \
269 regs->fr[ 2] = 0LL; \
270 regs->fr[ 3] = 0LL; \
271 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
272 regs->gr[31] = pc; \
273 \
274 get_user(regs->gr[25], (argv - 1)); \
275 regs->gr[24] = (long) argv; \
276 regs->gr[23] = 0; \
277 } while(0)
278
279 struct task_struct;
280 struct mm_struct;
281
282 /* Free all resources held by a thread. */
283 extern void release_thread(struct task_struct *);
284
285 extern unsigned long get_wchan(struct task_struct *p);
286
287 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
288 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
289
290 #define cpu_relax() barrier()
291
292 /*
293 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
294 * cached CPUs which require a guarantee of coherency (no inequivalent aliases
295 * with different data, whether clean or not) to operate
296 */
297 #ifdef CONFIG_PA8X00
298 extern int _parisc_requires_coherency;
299 #define parisc_requires_coherency() _parisc_requires_coherency
300 #else
301 #define parisc_requires_coherency() (0)
302 #endif
303
304 extern int running_on_qemu;
305
306 #endif /* __ASSEMBLY__ */
307
308 #endif /* __ASM_PARISC_PROCESSOR_H */