Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
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__ | |
1da177e4 LT |
13 | #include <linux/threads.h> |
14 | ||
959f4f13 | 15 | #include <asm/prefetch.h> |
1da177e4 | 16 | #include <asm/hardware.h> |
1da177e4 LT |
17 | #include <asm/pdc.h> |
18 | #include <asm/ptrace.h> | |
19 | #include <asm/types.h> | |
ef017beb | 20 | #include <asm/percpu.h> |
1da177e4 LT |
21 | #endif /* __ASSEMBLY__ */ |
22 | ||
1da177e4 LT |
23 | /* |
24 | * Default implementation of macro that returns current | |
25 | * instruction pointer ("program counter"). | |
26 | */ | |
1b6d1b5e KM |
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; }) | |
1da177e4 | 33 | |
9dabf60d HD |
34 | #define HAVE_ARCH_PICK_MMAP_LAYOUT |
35 | ||
82455257 DH |
36 | #define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) |
37 | #define TASK_SIZE TASK_SIZE_OF(current) | |
1da177e4 LT |
38 | #define TASK_UNMAPPED_BASE (current->thread.map_base) |
39 | ||
40 | #define DEFAULT_TASK_SIZE32 (0xFFF00000UL) | |
41 | #define DEFAULT_MAP_BASE32 (0x40000000UL) | |
42 | ||
513e7ecd | 43 | #ifdef CONFIG_64BIT |
1da177e4 LT |
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 | ||
922a70d3 DH |
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 | ||
042d27ac HD |
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)) | |
d71f290b | 63 | |
922a70d3 DH |
64 | #endif |
65 | ||
1da177e4 LT |
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 | ||
e9541d0c HD |
89 | const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */ |
90 | const char *family_name; /* e.g. "1.1e" */ | |
1da177e4 LT |
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 */ | |
1da177e4 | 97 | unsigned long irq_count; /* number of IRQ's since boot */ |
1da177e4 LT |
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 | |
1da177e4 | 102 | unsigned long pending_ipi; /* bitmap of type ipi_message_type */ |
1da177e4 LT |
103 | #endif |
104 | unsigned long bh_count; /* number of times bh was invoked */ | |
1da177e4 LT |
105 | unsigned long fp_rev; |
106 | unsigned long fp_model; | |
c8c37359 HD |
107 | unsigned long cpu_num; /* CPU number from PAT firmware */ |
108 | unsigned long cpu_loc; /* CPU location from PAT firmware */ | |
1da177e4 LT |
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; | |
ef017beb | 115 | DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data); |
1da177e4 LT |
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 | ||
abf1e11a KM |
132 | #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs)) |
133 | ||
1da177e4 | 134 | /* Thread struct flags. */ |
f053725b KM |
135 | #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */ |
136 | #define PARISC_UAC_SIGBUS (1UL << 1) | |
1da177e4 LT |
137 | #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ |
138 | ||
f053725b KM |
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 | ||
1da177e4 | 156 | #define INIT_THREAD { \ |
02d79800 AD |
157 | .regs = { .gr = { 0, }, \ |
158 | .fr = { 0, }, \ | |
159 | .sr = { 0, }, \ | |
160 | .iasq = { 0, }, \ | |
161 | .iaoq = { 0, }, \ | |
162 | .cr27 = 0, \ | |
1da177e4 | 163 | }, \ |
02d79800 AD |
164 | .task_size = DEFAULT_TASK_SIZE, \ |
165 | .map_base = DEFAULT_MAP_BASE, \ | |
166 | .flags = 0 \ | |
1da177e4 LT |
167 | } |
168 | ||
527dcdcc | 169 | struct task_struct; |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
513e7ecd | 259 | #ifdef CONFIG_64BIT |
df570b9c | 260 | #define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT)) |
1da177e4 LT |
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 | \ | |
1da177e4 LT |
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 *); | |
1da177e4 | 299 | |
1da177e4 LT |
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 | ||
1da177e4 LT |
305 | #define cpu_relax() barrier() |
306 | ||
fc632575 HD |
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 | */ | |
20f4d3cb | 312 | #ifdef CONFIG_PA8X00 |
fc632575 HD |
313 | extern int _parisc_requires_coherency; |
314 | #define parisc_requires_coherency() _parisc_requires_coherency | |
20f4d3cb | 315 | #else |
fc632575 | 316 | #define parisc_requires_coherency() (0) |
20f4d3cb | 317 | #endif |
20f4d3cb | 318 | |
90c3f0d3 HD |
319 | extern int running_on_qemu; |
320 | ||
1da177e4 LT |
321 | #endif /* __ASSEMBLY__ */ |
322 | ||
323 | #endif /* __ASM_PARISC_PROCESSOR_H */ |