parisc: wire sys_perf_counter_open to sys_ni_syscall
[linux-2.6.git] / arch / parisc / include / asm / processor.h
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/system.h>
20 #include <asm/percpu.h>
21 #endif /* __ASSEMBLY__ */
22
23 #define KERNEL_STACK_SIZE       (4*PAGE_SIZE)
24
25 /*
26  * Default implementation of macro that returns current
27  * instruction pointer ("program counter").
28  */
29 #ifdef CONFIG_PA20
30 #define current_ia(x)   __asm__("mfia %0" : "=r"(x))
31 #else /* mfia added in pa2.0 */
32 #define current_ia(x)   __asm__("blr 0,%0\n\tnop" : "=r"(x))
33 #endif
34 #define current_text_addr() ({ void *pc; current_ia(pc); pc; })
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 #endif
60
61 #ifndef __ASSEMBLY__
62
63 /*
64  * Data detected about CPUs at boot time which is the same for all CPU's.
65  * HP boxes are SMP - ie identical processors.
66  *
67  * FIXME: some CPU rev info may be processor specific...
68  */
69 struct system_cpuinfo_parisc {
70         unsigned int    cpu_count;
71         unsigned int    cpu_hz;
72         unsigned int    hversion;
73         unsigned int    sversion;
74         enum cpu_type   cpu_type;
75
76         struct {
77                 struct pdc_model model;
78                 unsigned long versions;
79                 unsigned long cpuid;
80                 unsigned long capabilities;
81                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
82         } pdc;
83
84         const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
85         const char      *family_name;   /* e.g. "1.1e" */
86 };
87
88
89 /* Per CPU data structure - ie varies per CPU.  */
90 struct cpuinfo_parisc {
91         unsigned long it_value;     /* Interval Timer at last timer Intr */
92         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
93         unsigned long irq_count;    /* number of IRQ's since boot */
94         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
95         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
96         unsigned long hpa;          /* Host Physical address */
97         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
98 #ifdef CONFIG_SMP
99         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
100         unsigned long ipi_count;    /* number ipi Interrupts */
101 #endif
102         unsigned long bh_count;     /* number of times bh was invoked */
103         unsigned long prof_counter; /* per CPU profiling support */
104         unsigned long prof_multiplier;  /* per CPU profiling support */
105         unsigned long fp_rev;
106         unsigned long fp_model;
107         unsigned int state;
108         struct parisc_device *dev;
109         unsigned long loops_per_jiffy;
110 };
111
112 extern struct system_cpuinfo_parisc boot_cpu_data;
113 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
114
115 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
116
117 typedef struct {
118         int seg;  
119 } mm_segment_t;
120
121 #define ARCH_MIN_TASKALIGN      8
122
123 struct thread_struct {
124         struct pt_regs regs;
125         unsigned long  task_size;
126         unsigned long  map_base;
127         unsigned long  flags;
128 }; 
129
130 /* Thread struct flags. */
131 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
132 #define PARISC_UAC_SIGBUS       (1UL << 1)
133 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
134
135 #define PARISC_UAC_SHIFT        0
136 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
137
138 #define SET_UNALIGN_CTL(task,value)                                       \
139         ({                                                                \
140         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
141                                 | (((value) << PARISC_UAC_SHIFT) &        \
142                                    PARISC_UAC_MASK));                     \
143         0;                                                                \
144         })
145
146 #define GET_UNALIGN_CTL(task,addr)                                        \
147         ({                                                                \
148         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
149                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
150         })
151
152 #define INIT_THREAD { \
153         .regs = {       .gr     = { 0, }, \
154                         .fr     = { 0, }, \
155                         .sr     = { 0, }, \
156                         .iasq   = { 0, }, \
157                         .iaoq   = { 0, }, \
158                         .cr27   = 0, \
159                 }, \
160         .task_size      = DEFAULT_TASK_SIZE, \
161         .map_base       = DEFAULT_MAP_BASE, \
162         .flags          = 0 \
163         }
164
165 /*
166  * Return saved PC of a blocked thread.  This is used by ps mostly.
167  */
168
169 unsigned long thread_saved_pc(struct task_struct *t);
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 #define start_thread_som(regs, new_pc, new_sp) do {     \
190         unsigned long *sp = (unsigned long *)new_sp;    \
191         __u32 spaceid = (__u32)current->mm->context;    \
192         unsigned long pc = (unsigned long)new_pc;       \
193         /* offset pc for priv. level */                 \
194         pc |= 3;                                        \
195                                                         \
196         set_fs(USER_DS);                                \
197         regs->iasq[0] = spaceid;                        \
198         regs->iasq[1] = spaceid;                        \
199         regs->iaoq[0] = pc;                             \
200         regs->iaoq[1] = pc + 4;                         \
201         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
202         regs->sr[3] = 0xffff;                           \
203         regs->sr[4] = spaceid;                          \
204         regs->sr[5] = spaceid;                          \
205         regs->sr[6] = spaceid;                          \
206         regs->sr[7] = spaceid;                          \
207         regs->gr[ 0] = USER_PSW;                        \
208         regs->gr[30] = ((new_sp)+63)&~63;               \
209         regs->gr[31] = pc;                              \
210                                                         \
211         get_user(regs->gr[26],&sp[0]);                  \
212         get_user(regs->gr[25],&sp[-1]);                 \
213         get_user(regs->gr[24],&sp[-2]);                 \
214         get_user(regs->gr[23],&sp[-3]);                 \
215 } while(0)
216
217 /* The ELF abi wants things done a "wee bit" differently than
218  * som does.  Supporting this behavior here avoids
219  * having our own version of create_elf_tables.
220  *
221  * Oh, and yes, that is not a typo, we are really passing argc in r25
222  * and argv in r24 (rather than r26 and r25).  This is because that's
223  * where __libc_start_main wants them.
224  *
225  * Duplicated from dl-machine.h for the benefit of readers:
226  *
227  *  Our initial stack layout is rather different from everyone else's
228  *  due to the unique PA-RISC ABI.  As far as I know it looks like
229  *  this:
230
231    -----------------------------------  (user startup code creates this frame)
232    |         32 bytes of magic       |
233    |---------------------------------|
234    | 32 bytes argument/sp save area  |
235    |---------------------------------| (bprm->p)
236    |        ELF auxiliary info       |
237    |         (up to 28 words)        |
238    |---------------------------------|
239    |               NULL              |
240    |---------------------------------|
241    |       Environment pointers      |
242    |---------------------------------|
243    |               NULL              |
244    |---------------------------------|
245    |        Argument pointers        |
246    |---------------------------------| <- argv
247    |          argc (1 word)          |
248    |---------------------------------| <- bprm->exec (HACK!)
249    |         N bytes of slack        |
250    |---------------------------------|
251    |    filename passed to execve    |
252    |---------------------------------| (mm->env_end)
253    |           env strings           |
254    |---------------------------------| (mm->env_start, mm->arg_end)
255    |           arg strings           |
256    |---------------------------------|
257    | additional faked arg strings if |
258    | we're invoked via binfmt_script |
259    |---------------------------------| (mm->arg_start)
260    stack base is at TASK_SIZE - rlim_max.
261
262 on downward growing arches, it looks like this:
263    stack base at TASK_SIZE
264    | filename passed to execve
265    | env strings
266    | arg strings
267    | faked arg strings
268    | slack
269    | ELF
270    | envps
271    | argvs
272    | argc
273
274  *  The pleasant part of this is that if we need to skip arguments we
275  *  can just decrement argc and move argv, because the stack pointer
276  *  is utterly unrelated to the location of the environment and
277  *  argument vectors.
278  *
279  * Note that the S/390 people took the easy way out and hacked their
280  * GCC to make the stack grow downwards.
281  *
282  * Final Note: For entry from syscall, the W (wide) bit of the PSW
283  * is stuffed into the lowest bit of the user sp (%r30), so we fill
284  * it in here from the current->personality
285  */
286
287 #ifdef CONFIG_64BIT
288 #define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
289 #else
290 #define USER_WIDE_MODE  0
291 #endif
292
293 #define start_thread(regs, new_pc, new_sp) do {         \
294         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
295         __u32 spaceid = (__u32)current->mm->context;    \
296         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
297         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
298                                                         \
299         set_fs(USER_DS);                                \
300         regs->iasq[0] = spaceid;                        \
301         regs->iasq[1] = spaceid;                        \
302         regs->iaoq[0] = pc;                             \
303         regs->iaoq[1] = pc + 4;                         \
304         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
305         regs->sr[3] = 0xffff;                           \
306         regs->sr[4] = spaceid;                          \
307         regs->sr[5] = spaceid;                          \
308         regs->sr[6] = spaceid;                          \
309         regs->sr[7] = spaceid;                          \
310         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
311         regs->fr[ 0] = 0LL;                             \
312         regs->fr[ 1] = 0LL;                             \
313         regs->fr[ 2] = 0LL;                             \
314         regs->fr[ 3] = 0LL;                             \
315         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
316         regs->gr[31] = pc;                              \
317                                                         \
318         get_user(regs->gr[25], (argv - 1));             \
319         regs->gr[24] = (long) argv;                     \
320         regs->gr[23] = 0;                               \
321 } while(0)
322
323 struct task_struct;
324 struct mm_struct;
325
326 /* Free all resources held by a thread. */
327 extern void release_thread(struct task_struct *);
328 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
329
330 /* Prepare to copy thread state - unlazy all lazy status */
331 #define prepare_to_copy(tsk)    do { } while (0)
332
333 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
334
335 extern unsigned long get_wchan(struct task_struct *p);
336
337 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
338 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
339
340 #define cpu_relax()     barrier()
341
342 /* Used as a macro to identify the combined VIPT/PIPT cached
343  * CPUs which require a guarantee of coherency (no inequivalent
344  * aliases with different data, whether clean or not) to operate */
345 static inline int parisc_requires_coherency(void)
346 {
347 #ifdef CONFIG_PA8X00
348         return (boot_cpu_data.cpu_type == mako) ||
349                 (boot_cpu_data.cpu_type == mako2);
350 #else
351         return 0;
352 #endif
353 }
354
355 #endif /* __ASSEMBLY__ */
356
357 #endif /* __ASM_PARISC_PROCESSOR_H */