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/threads.h>
13
14 #include <asm/prefetch.h>
15 #include <asm/hardware.h>
16 #include <asm/pdc.h>
17 #include <asm/ptrace.h>
18 #include <asm/types.h>
19 #include <asm/percpu.h>
20 #endif /* __ASSEMBLY__ */
21
22 /*
23 * Default implementation of macro that returns current
24 * instruction pointer ("program counter").
25 */
26 #ifdef CONFIG_PA20
27 #define current_ia(x) __asm__("mfia %0" : "=r"(x))
28 #else /* mfia added in pa2.0 */
29 #define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x))
30 #endif
31 #define current_text_addr() ({ void *pc; current_ia(pc); pc; })
32
33 #define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
34 #define TASK_SIZE TASK_SIZE_OF(current)
35 #define TASK_UNMAPPED_BASE (current->thread.map_base)
36
37 #define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
38 #define DEFAULT_MAP_BASE32 (0x40000000UL)
39
40 #ifdef CONFIG_64BIT
41 #define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
42 #define DEFAULT_MAP_BASE (0x200000000UL)
43 #else
44 #define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
45 #define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
46 #endif
47
48 #ifdef __KERNEL__
49
50 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
51 * prumpf */
52
53 #define STACK_TOP TASK_SIZE
54 #define STACK_TOP_MAX DEFAULT_TASK_SIZE
55
56 #endif
57
58 #ifndef __ASSEMBLY__
59
60 /*
61 * Data detected about CPUs at boot time which is the same for all CPU's.
62 * HP boxes are SMP - ie identical processors.
63 *
64 * FIXME: some CPU rev info may be processor specific...
65 */
66 struct system_cpuinfo_parisc {
67 unsigned int cpu_count;
68 unsigned int cpu_hz;
69 unsigned int hversion;
70 unsigned int sversion;
71 enum cpu_type cpu_type;
72
73 struct {
74 struct pdc_model model;
75 unsigned long versions;
76 unsigned long cpuid;
77 unsigned long capabilities;
78 char sys_model_name[81]; /* PDC-ROM returnes this model name */
79 } pdc;
80
81 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */
82 const char *family_name; /* e.g. "1.1e" */
83 };
84
85
86 /* Per CPU data structure - ie varies per CPU. */
87 struct cpuinfo_parisc {
88 unsigned long it_value; /* Interval Timer at last timer Intr */
89 unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */
90 unsigned long irq_count; /* number of IRQ's since boot */
91 unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
92 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
93 unsigned long hpa; /* Host Physical address */
94 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
95 #ifdef CONFIG_SMP
96 unsigned long pending_ipi; /* bitmap of type ipi_message_type */
97 #endif
98 unsigned long bh_count; /* number of times bh was invoked */
99 unsigned long prof_counter; /* per CPU profiling support */
100 unsigned long prof_multiplier; /* per CPU profiling support */
101 unsigned long fp_rev;
102 unsigned long fp_model;
103 unsigned int state;
104 struct parisc_device *dev;
105 unsigned long loops_per_jiffy;
106 };
107
108 extern struct system_cpuinfo_parisc boot_cpu_data;
109 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
110
111 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
112
113 typedef struct {
114 int seg;
115 } mm_segment_t;
116
117 #define ARCH_MIN_TASKALIGN 8
118
119 struct thread_struct {
120 struct pt_regs regs;
121 unsigned long task_size;
122 unsigned long map_base;
123 unsigned long flags;
124 };
125
126 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
127
128 /* Thread struct flags. */
129 #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
130 #define PARISC_UAC_SIGBUS (1UL << 1)
131 #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
132
133 #define PARISC_UAC_SHIFT 0
134 #define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
135
136 #define SET_UNALIGN_CTL(task,value) \
137 ({ \
138 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
139 | (((value) << PARISC_UAC_SHIFT) & \
140 PARISC_UAC_MASK)); \
141 0; \
142 })
143
144 #define GET_UNALIGN_CTL(task,addr) \
145 ({ \
146 put_user(((task)->thread.flags & PARISC_UAC_MASK) \
147 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \
148 })
149
150 #define INIT_THREAD { \
151 .regs = { .gr = { 0, }, \
152 .fr = { 0, }, \
153 .sr = { 0, }, \
154 .iasq = { 0, }, \
155 .iaoq = { 0, }, \
156 .cr27 = 0, \
157 }, \
158 .task_size = DEFAULT_TASK_SIZE, \
159 .map_base = DEFAULT_MAP_BASE, \
160 .flags = 0 \
161 }
162
163 /*
164 * Return saved PC of a blocked thread. This is used by ps mostly.
165 */
166
167 struct task_struct;
168 unsigned long thread_saved_pc(struct task_struct *t);
169 void show_trace(struct task_struct *task, unsigned long *stack);
170
171 /*
172 * Start user thread in another space.
173 *
174 * Note that we set both the iaoq and r31 to the new pc. When
175 * the kernel initially calls execve it will return through an
176 * rfi path that will use the values in the iaoq. The execve
177 * syscall path will return through the gateway page, and
178 * that uses r31 to branch to.
179 *
180 * For ELF we clear r23, because the dynamic linker uses it to pass
181 * the address of the finalizer function.
182 *
183 * We also initialize sr3 to an illegal value (illegal for our
184 * implementation, not for the architecture).
185 */
186 typedef unsigned int elf_caddr_t;
187
188 #define start_thread_som(regs, new_pc, new_sp) do { \
189 unsigned long *sp = (unsigned long *)new_sp; \
190 __u32 spaceid = (__u32)current->mm->context; \
191 unsigned long pc = (unsigned long)new_pc; \
192 /* offset pc for priv. level */ \
193 pc |= 3; \
194 \
195 regs->iasq[0] = spaceid; \
196 regs->iasq[1] = spaceid; \
197 regs->iaoq[0] = pc; \
198 regs->iaoq[1] = pc + 4; \
199 regs->sr[2] = LINUX_GATEWAY_SPACE; \
200 regs->sr[3] = 0xffff; \
201 regs->sr[4] = spaceid; \
202 regs->sr[5] = spaceid; \
203 regs->sr[6] = spaceid; \
204 regs->sr[7] = spaceid; \
205 regs->gr[ 0] = USER_PSW; \
206 regs->gr[30] = ((new_sp)+63)&~63; \
207 regs->gr[31] = pc; \
208 \
209 get_user(regs->gr[26],&sp[0]); \
210 get_user(regs->gr[25],&sp[-1]); \
211 get_user(regs->gr[24],&sp[-2]); \
212 get_user(regs->gr[23],&sp[-3]); \
213 } while(0)
214
215 /* The ELF abi wants things done a "wee bit" differently than
216 * som does. Supporting this behavior here avoids
217 * having our own version of create_elf_tables.
218 *
219 * Oh, and yes, that is not a typo, we are really passing argc in r25
220 * and argv in r24 (rather than r26 and r25). This is because that's
221 * where __libc_start_main wants them.
222 *
223 * Duplicated from dl-machine.h for the benefit of readers:
224 *
225 * Our initial stack layout is rather different from everyone else's
226 * due to the unique PA-RISC ABI. As far as I know it looks like
227 * this:
228
229 ----------------------------------- (user startup code creates this frame)
230 | 32 bytes of magic |
231 |---------------------------------|
232 | 32 bytes argument/sp save area |
233 |---------------------------------| (bprm->p)
234 | ELF auxiliary info |
235 | (up to 28 words) |
236 |---------------------------------|
237 | NULL |
238 |---------------------------------|
239 | Environment pointers |
240 |---------------------------------|
241 | NULL |
242 |---------------------------------|
243 | Argument pointers |
244 |---------------------------------| <- argv
245 | argc (1 word) |
246 |---------------------------------| <- bprm->exec (HACK!)
247 | N bytes of slack |
248 |---------------------------------|
249 | filename passed to execve |
250 |---------------------------------| (mm->env_end)
251 | env strings |
252 |---------------------------------| (mm->env_start, mm->arg_end)
253 | arg strings |
254 |---------------------------------|
255 | additional faked arg strings if |
256 | we're invoked via binfmt_script |
257 |---------------------------------| (mm->arg_start)
258 stack base is at TASK_SIZE - rlim_max.
259
260 on downward growing arches, it looks like this:
261 stack base at TASK_SIZE
262 | filename passed to execve
263 | env strings
264 | arg strings
265 | faked arg strings
266 | slack
267 | ELF
268 | envps
269 | argvs
270 | argc
271
272 * The pleasant part of this is that if we need to skip arguments we
273 * can just decrement argc and move argv, because the stack pointer
274 * is utterly unrelated to the location of the environment and
275 * argument vectors.
276 *
277 * Note that the S/390 people took the easy way out and hacked their
278 * GCC to make the stack grow downwards.
279 *
280 * Final Note: For entry from syscall, the W (wide) bit of the PSW
281 * is stuffed into the lowest bit of the user sp (%r30), so we fill
282 * it in here from the current->personality
283 */
284
285 #ifdef CONFIG_64BIT
286 #define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
287 #else
288 #define USER_WIDE_MODE 0
289 #endif
290
291 #define start_thread(regs, new_pc, new_sp) do { \
292 elf_addr_t *sp = (elf_addr_t *)new_sp; \
293 __u32 spaceid = (__u32)current->mm->context; \
294 elf_addr_t pc = (elf_addr_t)new_pc | 3; \
295 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
296 \
297 regs->iasq[0] = spaceid; \
298 regs->iasq[1] = spaceid; \
299 regs->iaoq[0] = pc; \
300 regs->iaoq[1] = pc + 4; \
301 regs->sr[2] = LINUX_GATEWAY_SPACE; \
302 regs->sr[3] = 0xffff; \
303 regs->sr[4] = spaceid; \
304 regs->sr[5] = spaceid; \
305 regs->sr[6] = spaceid; \
306 regs->sr[7] = spaceid; \
307 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
308 regs->fr[ 0] = 0LL; \
309 regs->fr[ 1] = 0LL; \
310 regs->fr[ 2] = 0LL; \
311 regs->fr[ 3] = 0LL; \
312 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
313 regs->gr[31] = pc; \
314 \
315 get_user(regs->gr[25], (argv - 1)); \
316 regs->gr[24] = (long) argv; \
317 regs->gr[23] = 0; \
318 } while(0)
319
320 struct task_struct;
321 struct mm_struct;
322
323 /* Free all resources held by a thread. */
324 extern void release_thread(struct task_struct *);
325
326 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
327
328 extern unsigned long get_wchan(struct task_struct *p);
329
330 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
331 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
332
333 #define cpu_relax() barrier()
334
335 /* Used as a macro to identify the combined VIPT/PIPT cached
336 * CPUs which require a guarantee of coherency (no inequivalent
337 * aliases with different data, whether clean or not) to operate */
parisc_requires_coherency(void)338 static inline int parisc_requires_coherency(void)
339 {
340 #ifdef CONFIG_PA8X00
341 return (boot_cpu_data.cpu_type == mako) ||
342 (boot_cpu_data.cpu_type == mako2);
343 #else
344 return 0;
345 #endif
346 }
347
348 #endif /* __ASSEMBLY__ */
349
350 #endif /* __ASM_PARISC_PROCESSOR_H */
351