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1da177e4 LT |
1 | /* |
2 | * include/asm-parisc/processor.h | |
3 | * | |
4 | * Copyright (C) 1994 Linus Torvalds | |
5 | * Copyright (C) 2001 Grant Grundler | |
6 | */ | |
7 | ||
8 | #ifndef __ASM_PARISC_PROCESSOR_H | |
9 | #define __ASM_PARISC_PROCESSOR_H | |
10 | ||
11 | #ifndef __ASSEMBLY__ | |
12 | #include <linux/config.h> | |
13 | #include <linux/threads.h> | |
fb1c8f93 | 14 | #include <linux/spinlock_types.h> |
1da177e4 LT |
15 | |
16 | #include <asm/hardware.h> | |
17 | #include <asm/page.h> | |
18 | #include <asm/pdc.h> | |
19 | #include <asm/ptrace.h> | |
20 | #include <asm/types.h> | |
21 | #include <asm/system.h> | |
22 | #endif /* __ASSEMBLY__ */ | |
23 | ||
24 | #define KERNEL_STACK_SIZE (4*PAGE_SIZE) | |
25 | ||
26 | /* | |
27 | * Default implementation of macro that returns current | |
28 | * instruction pointer ("program counter"). | |
29 | */ | |
30 | ||
31 | /* We cannot use MFIA as it was added for PA2.0 - prumpf | |
32 | ||
33 | At one point there were no "0f/0b" type local symbols in gas for | |
34 | PA-RISC. This is no longer true, but this still seems like the | |
35 | nicest way to implement this. */ | |
36 | ||
37 | #define current_text_addr() ({ void *pc; __asm__("\n\tblr 0,%0\n\tnop":"=r" (pc)); pc; }) | |
38 | ||
39 | #define TASK_SIZE (current->thread.task_size) | |
40 | #define TASK_UNMAPPED_BASE (current->thread.map_base) | |
41 | ||
42 | #define DEFAULT_TASK_SIZE32 (0xFFF00000UL) | |
43 | #define DEFAULT_MAP_BASE32 (0x40000000UL) | |
44 | ||
45 | #ifdef __LP64__ | |
46 | #define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000) | |
47 | #define DEFAULT_MAP_BASE (0x200000000UL) | |
48 | #else | |
49 | #define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32 | |
50 | #define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32 | |
51 | #endif | |
52 | ||
53 | #ifndef __ASSEMBLY__ | |
54 | ||
55 | /* | |
56 | * Data detected about CPUs at boot time which is the same for all CPU's. | |
57 | * HP boxes are SMP - ie identical processors. | |
58 | * | |
59 | * FIXME: some CPU rev info may be processor specific... | |
60 | */ | |
61 | struct system_cpuinfo_parisc { | |
62 | unsigned int cpu_count; | |
63 | unsigned int cpu_hz; | |
64 | unsigned int hversion; | |
65 | unsigned int sversion; | |
66 | enum cpu_type cpu_type; | |
67 | ||
68 | struct { | |
69 | struct pdc_model model; | |
70 | unsigned long versions; | |
71 | unsigned long cpuid; | |
72 | unsigned long capabilities; | |
73 | char sys_model_name[81]; /* PDC-ROM returnes this model name */ | |
74 | } pdc; | |
75 | ||
76 | char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */ | |
77 | char *family_name; /* e.g. "1.1e" */ | |
78 | }; | |
79 | ||
80 | ||
81 | /* Per CPU data structure - ie varies per CPU. */ | |
82 | struct cpuinfo_parisc { | |
83 | unsigned long it_value; /* Interval Timer at last timer Intr */ | |
84 | unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */ | |
85 | unsigned long irq_count; /* number of IRQ's since boot */ | |
86 | unsigned long irq_max_cr16; /* longest time to handle a single IRQ */ | |
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 | spinlock_t lock; /* synchronization for ipi's */ | |
92 | unsigned long pending_ipi; /* bitmap of type ipi_message_type */ | |
93 | unsigned long ipi_count; /* number ipi Interrupts */ | |
94 | #endif | |
95 | unsigned long bh_count; /* number of times bh was invoked */ | |
96 | unsigned long prof_counter; /* per CPU profiling support */ | |
97 | unsigned long prof_multiplier; /* per CPU profiling support */ | |
98 | unsigned long fp_rev; | |
99 | unsigned long fp_model; | |
100 | unsigned int state; | |
101 | struct parisc_device *dev; | |
102 | unsigned long loops_per_jiffy; | |
103 | }; | |
104 | ||
105 | extern struct system_cpuinfo_parisc boot_cpu_data; | |
106 | extern struct cpuinfo_parisc cpu_data[NR_CPUS]; | |
107 | #define current_cpu_data cpu_data[smp_processor_id()] | |
108 | ||
109 | #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) | |
110 | ||
111 | typedef struct { | |
112 | int seg; | |
113 | } mm_segment_t; | |
114 | ||
115 | #define ARCH_MIN_TASKALIGN 8 | |
116 | ||
117 | struct thread_struct { | |
118 | struct pt_regs regs; | |
119 | unsigned long task_size; | |
120 | unsigned long map_base; | |
121 | unsigned long flags; | |
122 | }; | |
123 | ||
124 | /* Thread struct flags. */ | |
125 | #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ | |
126 | ||
127 | #define INIT_THREAD { \ | |
128 | regs: { gr: { 0, }, \ | |
129 | fr: { 0, }, \ | |
130 | sr: { 0, }, \ | |
131 | iasq: { 0, }, \ | |
132 | iaoq: { 0, }, \ | |
133 | cr27: 0, \ | |
134 | }, \ | |
135 | task_size: DEFAULT_TASK_SIZE, \ | |
136 | map_base: DEFAULT_MAP_BASE, \ | |
137 | flags: 0 \ | |
138 | } | |
139 | ||
140 | /* | |
141 | * Return saved PC of a blocked thread. This is used by ps mostly. | |
142 | */ | |
143 | ||
144 | unsigned long thread_saved_pc(struct task_struct *t); | |
145 | void show_trace(struct task_struct *task, unsigned long *stack); | |
146 | ||
147 | /* | |
148 | * Start user thread in another space. | |
149 | * | |
150 | * Note that we set both the iaoq and r31 to the new pc. When | |
151 | * the kernel initially calls execve it will return through an | |
152 | * rfi path that will use the values in the iaoq. The execve | |
153 | * syscall path will return through the gateway page, and | |
154 | * that uses r31 to branch to. | |
155 | * | |
156 | * For ELF we clear r23, because the dynamic linker uses it to pass | |
157 | * the address of the finalizer function. | |
158 | * | |
159 | * We also initialize sr3 to an illegal value (illegal for our | |
160 | * implementation, not for the architecture). | |
161 | */ | |
162 | typedef unsigned int elf_caddr_t; | |
163 | ||
164 | #define start_thread_som(regs, new_pc, new_sp) do { \ | |
165 | unsigned long *sp = (unsigned long *)new_sp; \ | |
166 | __u32 spaceid = (__u32)current->mm->context; \ | |
167 | unsigned long pc = (unsigned long)new_pc; \ | |
168 | /* offset pc for priv. level */ \ | |
169 | pc |= 3; \ | |
170 | \ | |
171 | set_fs(USER_DS); \ | |
172 | regs->iasq[0] = spaceid; \ | |
173 | regs->iasq[1] = spaceid; \ | |
174 | regs->iaoq[0] = pc; \ | |
175 | regs->iaoq[1] = pc + 4; \ | |
176 | regs->sr[2] = LINUX_GATEWAY_SPACE; \ | |
177 | regs->sr[3] = 0xffff; \ | |
178 | regs->sr[4] = spaceid; \ | |
179 | regs->sr[5] = spaceid; \ | |
180 | regs->sr[6] = spaceid; \ | |
181 | regs->sr[7] = spaceid; \ | |
182 | regs->gr[ 0] = USER_PSW; \ | |
183 | regs->gr[30] = ((new_sp)+63)&~63; \ | |
184 | regs->gr[31] = pc; \ | |
185 | \ | |
186 | get_user(regs->gr[26],&sp[0]); \ | |
187 | get_user(regs->gr[25],&sp[-1]); \ | |
188 | get_user(regs->gr[24],&sp[-2]); \ | |
189 | get_user(regs->gr[23],&sp[-3]); \ | |
190 | } while(0) | |
191 | ||
192 | /* The ELF abi wants things done a "wee bit" differently than | |
193 | * som does. Supporting this behavior here avoids | |
194 | * having our own version of create_elf_tables. | |
195 | * | |
196 | * Oh, and yes, that is not a typo, we are really passing argc in r25 | |
197 | * and argv in r24 (rather than r26 and r25). This is because that's | |
198 | * where __libc_start_main wants them. | |
199 | * | |
200 | * Duplicated from dl-machine.h for the benefit of readers: | |
201 | * | |
202 | * Our initial stack layout is rather different from everyone else's | |
203 | * due to the unique PA-RISC ABI. As far as I know it looks like | |
204 | * this: | |
205 | ||
206 | ----------------------------------- (user startup code creates this frame) | |
207 | | 32 bytes of magic | | |
208 | |---------------------------------| | |
209 | | 32 bytes argument/sp save area | | |
210 | |---------------------------------| (bprm->p) | |
211 | | ELF auxiliary info | | |
212 | | (up to 28 words) | | |
213 | |---------------------------------| | |
214 | | NULL | | |
215 | |---------------------------------| | |
216 | | Environment pointers | | |
217 | |---------------------------------| | |
218 | | NULL | | |
219 | |---------------------------------| | |
220 | | Argument pointers | | |
221 | |---------------------------------| <- argv | |
222 | | argc (1 word) | | |
223 | |---------------------------------| <- bprm->exec (HACK!) | |
224 | | N bytes of slack | | |
225 | |---------------------------------| | |
226 | | filename passed to execve | | |
227 | |---------------------------------| (mm->env_end) | |
228 | | env strings | | |
229 | |---------------------------------| (mm->env_start, mm->arg_end) | |
230 | | arg strings | | |
231 | |---------------------------------| | |
232 | | additional faked arg strings if | | |
233 | | we're invoked via binfmt_script | | |
234 | |---------------------------------| (mm->arg_start) | |
235 | stack base is at TASK_SIZE - rlim_max. | |
236 | ||
237 | on downward growing arches, it looks like this: | |
238 | stack base at TASK_SIZE | |
239 | | filename passed to execve | |
240 | | env strings | |
241 | | arg strings | |
242 | | faked arg strings | |
243 | | slack | |
244 | | ELF | |
245 | | envps | |
246 | | argvs | |
247 | | argc | |
248 | ||
249 | * The pleasant part of this is that if we need to skip arguments we | |
250 | * can just decrement argc and move argv, because the stack pointer | |
251 | * is utterly unrelated to the location of the environment and | |
252 | * argument vectors. | |
253 | * | |
254 | * Note that the S/390 people took the easy way out and hacked their | |
255 | * GCC to make the stack grow downwards. | |
256 | * | |
257 | * Final Note: For entry from syscall, the W (wide) bit of the PSW | |
258 | * is stuffed into the lowest bit of the user sp (%r30), so we fill | |
259 | * it in here from the current->personality | |
260 | */ | |
261 | ||
262 | #ifdef __LP64__ | |
263 | #define USER_WIDE_MODE (personality(current->personality) == PER_LINUX) | |
264 | #else | |
265 | #define USER_WIDE_MODE 0 | |
266 | #endif | |
267 | ||
268 | #define start_thread(regs, new_pc, new_sp) do { \ | |
269 | elf_addr_t *sp = (elf_addr_t *)new_sp; \ | |
270 | __u32 spaceid = (__u32)current->mm->context; \ | |
271 | elf_addr_t pc = (elf_addr_t)new_pc | 3; \ | |
272 | elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \ | |
273 | \ | |
274 | set_fs(USER_DS); \ | |
275 | regs->iasq[0] = spaceid; \ | |
276 | regs->iasq[1] = spaceid; \ | |
277 | regs->iaoq[0] = pc; \ | |
278 | regs->iaoq[1] = pc + 4; \ | |
279 | regs->sr[2] = LINUX_GATEWAY_SPACE; \ | |
280 | regs->sr[3] = 0xffff; \ | |
281 | regs->sr[4] = spaceid; \ | |
282 | regs->sr[5] = spaceid; \ | |
283 | regs->sr[6] = spaceid; \ | |
284 | regs->sr[7] = spaceid; \ | |
285 | regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \ | |
286 | regs->fr[ 0] = 0LL; \ | |
287 | regs->fr[ 1] = 0LL; \ | |
288 | regs->fr[ 2] = 0LL; \ | |
289 | regs->fr[ 3] = 0LL; \ | |
290 | regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \ | |
291 | regs->gr[31] = pc; \ | |
292 | \ | |
293 | get_user(regs->gr[25], (argv - 1)); \ | |
294 | regs->gr[24] = (long) argv; \ | |
295 | regs->gr[23] = 0; \ | |
296 | } while(0) | |
297 | ||
298 | struct task_struct; | |
299 | struct mm_struct; | |
300 | ||
301 | /* Free all resources held by a thread. */ | |
302 | extern void release_thread(struct task_struct *); | |
303 | extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); | |
304 | ||
305 | /* Prepare to copy thread state - unlazy all lazy status */ | |
306 | #define prepare_to_copy(tsk) do { } while (0) | |
307 | ||
308 | extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm); | |
309 | ||
310 | extern unsigned long get_wchan(struct task_struct *p); | |
311 | ||
312 | #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0]) | |
313 | #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30]) | |
314 | ||
315 | ||
316 | /* | |
317 | * PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book. | |
318 | * In addition, many implementations do hardware prefetching of both | |
319 | * instructions and data. | |
320 | * | |
321 | * PA7300LC (page 14-4 of the ERS) also implements prefetching by a load | |
322 | * to gr0 but not in a way that Linux can use. If the load would cause an | |
323 | * interruption (eg due to prefetching 0), it is suppressed on PA2.0 | |
324 | * processors, but not on 7300LC. | |
325 | */ | |
326 | #ifdef CONFIG_PREFETCH | |
327 | #define ARCH_HAS_PREFETCH | |
328 | #define ARCH_HAS_PREFETCHW | |
329 | ||
330 | extern inline void prefetch(const void *addr) | |
331 | { | |
332 | __asm__("ldw 0(%0), %%r0" : : "r" (addr)); | |
333 | } | |
334 | ||
335 | extern inline void prefetchw(const void *addr) | |
336 | { | |
337 | __asm__("ldd 0(%0), %%r0" : : "r" (addr)); | |
338 | } | |
339 | #endif | |
340 | ||
341 | #define cpu_relax() barrier() | |
342 | ||
343 | #endif /* __ASSEMBLY__ */ | |
344 | ||
345 | #endif /* __ASM_PARISC_PROCESSOR_H */ |