Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for...
[linux-2.6] / include / asm-parisc / 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 #include <linux/spinlock_types.h>
14
15 #include <asm/hardware.h>
16 #include <asm/page.h>
17 #include <asm/pdc.h>
18 #include <asm/ptrace.h>
19 #include <asm/types.h>
20 #include <asm/system.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               (current->thread.task_size)
37 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
38
39 #define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
40 #define DEFAULT_MAP_BASE32      (0x40000000UL)
41
42 #ifdef __LP64__
43 #define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
44 #define DEFAULT_MAP_BASE        (0x200000000UL)
45 #else
46 #define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
47 #define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
48 #endif
49
50 #ifndef __ASSEMBLY__
51
52 /*
53  * Data detected about CPUs at boot time which is the same for all CPU's.
54  * HP boxes are SMP - ie identical processors.
55  *
56  * FIXME: some CPU rev info may be processor specific...
57  */
58 struct system_cpuinfo_parisc {
59         unsigned int    cpu_count;
60         unsigned int    cpu_hz;
61         unsigned int    hversion;
62         unsigned int    sversion;
63         enum cpu_type   cpu_type;
64
65         struct {
66                 struct pdc_model model;
67                 unsigned long versions;
68                 unsigned long cpuid;
69                 unsigned long capabilities;
70                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
71         } pdc;
72
73         char            *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
74         char            *family_name;   /* e.g. "1.1e" */
75 };
76
77
78 /* Per CPU data structure - ie varies per CPU.  */
79 struct cpuinfo_parisc {
80         unsigned long it_value;     /* Interval Timer at last timer Intr */
81         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
82         unsigned long irq_count;    /* number of IRQ's since boot */
83         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
84         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
85         unsigned long hpa;          /* Host Physical address */
86         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
87 #ifdef CONFIG_SMP
88         spinlock_t lock;            /* synchronization for ipi's */
89         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
90         unsigned long ipi_count;    /* number ipi Interrupts */
91 #endif
92         unsigned long bh_count;     /* number of times bh was invoked */
93         unsigned long prof_counter; /* per CPU profiling support */
94         unsigned long prof_multiplier;  /* per CPU profiling support */
95         unsigned long fp_rev;
96         unsigned long fp_model;
97         unsigned int state;
98         struct parisc_device *dev;
99         unsigned long loops_per_jiffy;
100 };
101
102 extern struct system_cpuinfo_parisc boot_cpu_data;
103 extern struct cpuinfo_parisc cpu_data[NR_CPUS];
104 #define current_cpu_data cpu_data[smp_processor_id()]
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 /* Thread struct flags. */
122 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
123 #define PARISC_UAC_SIGBUS       (1UL << 1)
124 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
125
126 #define PARISC_UAC_SHIFT        0
127 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
128
129 #define SET_UNALIGN_CTL(task,value)                                       \
130         ({                                                                \
131         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
132                                 | (((value) << PARISC_UAC_SHIFT) &        \
133                                    PARISC_UAC_MASK));                     \
134         0;                                                                \
135         })
136
137 #define GET_UNALIGN_CTL(task,addr)                                        \
138         ({                                                                \
139         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
140                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
141         })
142
143 #define INIT_THREAD { \
144         .regs = {       .gr     = { 0, }, \
145                         .fr     = { 0, }, \
146                         .sr     = { 0, }, \
147                         .iasq   = { 0, }, \
148                         .iaoq   = { 0, }, \
149                         .cr27   = 0, \
150                 }, \
151         .task_size      = DEFAULT_TASK_SIZE, \
152         .map_base       = DEFAULT_MAP_BASE, \
153         .flags          = 0 \
154         }
155
156 /*
157  * Return saved PC of a blocked thread.  This is used by ps mostly.
158  */
159
160 unsigned long thread_saved_pc(struct task_struct *t);
161 void show_trace(struct task_struct *task, unsigned long *stack);
162
163 /*
164  * Start user thread in another space.
165  *
166  * Note that we set both the iaoq and r31 to the new pc. When
167  * the kernel initially calls execve it will return through an
168  * rfi path that will use the values in the iaoq. The execve
169  * syscall path will return through the gateway page, and
170  * that uses r31 to branch to.
171  *
172  * For ELF we clear r23, because the dynamic linker uses it to pass
173  * the address of the finalizer function.
174  *
175  * We also initialize sr3 to an illegal value (illegal for our
176  * implementation, not for the architecture).
177  */
178 typedef unsigned int elf_caddr_t;
179
180 #define start_thread_som(regs, new_pc, new_sp) do {     \
181         unsigned long *sp = (unsigned long *)new_sp;    \
182         __u32 spaceid = (__u32)current->mm->context;    \
183         unsigned long pc = (unsigned long)new_pc;       \
184         /* offset pc for priv. level */                 \
185         pc |= 3;                                        \
186                                                         \
187         set_fs(USER_DS);                                \
188         regs->iasq[0] = spaceid;                        \
189         regs->iasq[1] = spaceid;                        \
190         regs->iaoq[0] = pc;                             \
191         regs->iaoq[1] = pc + 4;                         \
192         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
193         regs->sr[3] = 0xffff;                           \
194         regs->sr[4] = spaceid;                          \
195         regs->sr[5] = spaceid;                          \
196         regs->sr[6] = spaceid;                          \
197         regs->sr[7] = spaceid;                          \
198         regs->gr[ 0] = USER_PSW;                        \
199         regs->gr[30] = ((new_sp)+63)&~63;               \
200         regs->gr[31] = pc;                              \
201                                                         \
202         get_user(regs->gr[26],&sp[0]);                  \
203         get_user(regs->gr[25],&sp[-1]);                 \
204         get_user(regs->gr[24],&sp[-2]);                 \
205         get_user(regs->gr[23],&sp[-3]);                 \
206 } while(0)
207
208 /* The ELF abi wants things done a "wee bit" differently than
209  * som does.  Supporting this behavior here avoids
210  * having our own version of create_elf_tables.
211  *
212  * Oh, and yes, that is not a typo, we are really passing argc in r25
213  * and argv in r24 (rather than r26 and r25).  This is because that's
214  * where __libc_start_main wants them.
215  *
216  * Duplicated from dl-machine.h for the benefit of readers:
217  *
218  *  Our initial stack layout is rather different from everyone else's
219  *  due to the unique PA-RISC ABI.  As far as I know it looks like
220  *  this:
221
222    -----------------------------------  (user startup code creates this frame)
223    |         32 bytes of magic       |
224    |---------------------------------|
225    | 32 bytes argument/sp save area  |
226    |---------------------------------| (bprm->p)
227    |        ELF auxiliary info       |
228    |         (up to 28 words)        |
229    |---------------------------------|
230    |               NULL              |
231    |---------------------------------|
232    |       Environment pointers      |
233    |---------------------------------|
234    |               NULL              |
235    |---------------------------------|
236    |        Argument pointers        |
237    |---------------------------------| <- argv
238    |          argc (1 word)          |
239    |---------------------------------| <- bprm->exec (HACK!)
240    |         N bytes of slack        |
241    |---------------------------------|
242    |    filename passed to execve    |
243    |---------------------------------| (mm->env_end)
244    |           env strings           |
245    |---------------------------------| (mm->env_start, mm->arg_end)
246    |           arg strings           |
247    |---------------------------------|
248    | additional faked arg strings if |
249    | we're invoked via binfmt_script |
250    |---------------------------------| (mm->arg_start)
251    stack base is at TASK_SIZE - rlim_max.
252
253 on downward growing arches, it looks like this:
254    stack base at TASK_SIZE
255    | filename passed to execve
256    | env strings
257    | arg strings
258    | faked arg strings
259    | slack
260    | ELF
261    | envps
262    | argvs
263    | argc
264
265  *  The pleasant part of this is that if we need to skip arguments we
266  *  can just decrement argc and move argv, because the stack pointer
267  *  is utterly unrelated to the location of the environment and
268  *  argument vectors.
269  *
270  * Note that the S/390 people took the easy way out and hacked their
271  * GCC to make the stack grow downwards.
272  *
273  * Final Note: For entry from syscall, the W (wide) bit of the PSW
274  * is stuffed into the lowest bit of the user sp (%r30), so we fill
275  * it in here from the current->personality
276  */
277
278 #ifdef __LP64__
279 #define USER_WIDE_MODE  (personality(current->personality) == PER_LINUX)
280 #else
281 #define USER_WIDE_MODE  0
282 #endif
283
284 #define start_thread(regs, new_pc, new_sp) do {         \
285         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
286         __u32 spaceid = (__u32)current->mm->context;    \
287         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
288         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
289                                                         \
290         set_fs(USER_DS);                                \
291         regs->iasq[0] = spaceid;                        \
292         regs->iasq[1] = spaceid;                        \
293         regs->iaoq[0] = pc;                             \
294         regs->iaoq[1] = pc + 4;                         \
295         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
296         regs->sr[3] = 0xffff;                           \
297         regs->sr[4] = spaceid;                          \
298         regs->sr[5] = spaceid;                          \
299         regs->sr[6] = spaceid;                          \
300         regs->sr[7] = spaceid;                          \
301         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
302         regs->fr[ 0] = 0LL;                             \
303         regs->fr[ 1] = 0LL;                             \
304         regs->fr[ 2] = 0LL;                             \
305         regs->fr[ 3] = 0LL;                             \
306         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
307         regs->gr[31] = pc;                              \
308                                                         \
309         get_user(regs->gr[25], (argv - 1));             \
310         regs->gr[24] = (long) argv;                     \
311         regs->gr[23] = 0;                               \
312 } while(0)
313
314 struct task_struct;
315 struct mm_struct;
316
317 /* Free all resources held by a thread. */
318 extern void release_thread(struct task_struct *);
319 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
320
321 /* Prepare to copy thread state - unlazy all lazy status */
322 #define prepare_to_copy(tsk)    do { } while (0)
323
324 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
325
326 extern unsigned long get_wchan(struct task_struct *p);
327
328 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
329 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
330
331
332 /*
333  * PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book.
334  * In addition, many implementations do hardware prefetching of both
335  * instructions and data.
336  *
337  * PA7300LC (page 14-4 of the ERS) also implements prefetching by a load
338  * to gr0 but not in a way that Linux can use.  If the load would cause an
339  * interruption (eg due to prefetching 0), it is suppressed on PA2.0
340  * processors, but not on 7300LC.
341  */
342 #ifdef  CONFIG_PREFETCH
343 #define ARCH_HAS_PREFETCH
344 #define ARCH_HAS_PREFETCHW
345
346 extern inline void prefetch(const void *addr)
347 {
348         __asm__("ldw 0(%0), %%r0" : : "r" (addr));
349 }
350
351 extern inline void prefetchw(const void *addr)
352 {
353         __asm__("ldd 0(%0), %%r0" : : "r" (addr));
354 }
355 #endif
356
357 #define cpu_relax()     barrier()
358
359 #endif /* __ASSEMBLY__ */
360
361 #endif /* __ASM_PARISC_PROCESSOR_H */