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processor.h
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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 
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 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
131 
132 /* Thread struct flags. */
133 #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
134 #define PARISC_UAC_SIGBUS (1UL << 1)
135 #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
136 
137 #define PARISC_UAC_SHIFT 0
138 #define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
139 
140 #define SET_UNALIGN_CTL(task,value) \
141  ({ \
142  (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
143  | (((value) << PARISC_UAC_SHIFT) & \
144  PARISC_UAC_MASK)); \
145  0; \
146  })
147 
148 #define GET_UNALIGN_CTL(task,addr) \
149  ({ \
150  put_user(((task)->thread.flags & PARISC_UAC_MASK) \
151  >> PARISC_UAC_SHIFT, (int __user *) (addr)); \
152  })
153 
154 #define INIT_THREAD { \
155  .regs = { .gr = { 0, }, \
156  .fr = { 0, }, \
157  .sr = { 0, }, \
158  .iasq = { 0, }, \
159  .iaoq = { 0, }, \
160  .cr27 = 0, \
161  }, \
162  .task_size = DEFAULT_TASK_SIZE, \
163  .map_base = DEFAULT_MAP_BASE, \
164  .flags = 0 \
165  }
166 
167 /*
168  * Return saved PC of a blocked thread. This is used by ps mostly.
169  */
170 
171 struct task_struct;
172 unsigned long thread_saved_pc(struct task_struct *t);
173 void show_trace(struct task_struct *task, unsigned long *stack);
174 
175 /*
176  * Start user thread in another space.
177  *
178  * Note that we set both the iaoq and r31 to the new pc. When
179  * the kernel initially calls execve it will return through an
180  * rfi path that will use the values in the iaoq. The execve
181  * syscall path will return through the gateway page, and
182  * that uses r31 to branch to.
183  *
184  * For ELF we clear r23, because the dynamic linker uses it to pass
185  * the address of the finalizer function.
186  *
187  * We also initialize sr3 to an illegal value (illegal for our
188  * implementation, not for the architecture).
189  */
190 typedef unsigned int elf_caddr_t;
191 
192 #define start_thread_som(regs, new_pc, new_sp) do { \
193  unsigned long *sp = (unsigned long *)new_sp; \
194  __u32 spaceid = (__u32)current->mm->context; \
195  unsigned long pc = (unsigned long)new_pc; \
196  /* offset pc for priv. level */ \
197  pc |= 3; \
198  \
199  regs->iasq[0] = spaceid; \
200  regs->iasq[1] = spaceid; \
201  regs->iaoq[0] = pc; \
202  regs->iaoq[1] = pc + 4; \
203  regs->sr[2] = LINUX_GATEWAY_SPACE; \
204  regs->sr[3] = 0xffff; \
205  regs->sr[4] = spaceid; \
206  regs->sr[5] = spaceid; \
207  regs->sr[6] = spaceid; \
208  regs->sr[7] = spaceid; \
209  regs->gr[ 0] = USER_PSW; \
210  regs->gr[30] = ((new_sp)+63)&~63; \
211  regs->gr[31] = pc; \
212  \
213  get_user(regs->gr[26],&sp[0]); \
214  get_user(regs->gr[25],&sp[-1]); \
215  get_user(regs->gr[24],&sp[-2]); \
216  get_user(regs->gr[23],&sp[-3]); \
217 } while(0)
218 
219 /* The ELF abi wants things done a "wee bit" differently than
220  * som does. Supporting this behavior here avoids
221  * having our own version of create_elf_tables.
222  *
223  * Oh, and yes, that is not a typo, we are really passing argc in r25
224  * and argv in r24 (rather than r26 and r25). This is because that's
225  * where __libc_start_main wants them.
226  *
227  * Duplicated from dl-machine.h for the benefit of readers:
228  *
229  * Our initial stack layout is rather different from everyone else's
230  * due to the unique PA-RISC ABI. As far as I know it looks like
231  * this:
232 
233  ----------------------------------- (user startup code creates this frame)
234  | 32 bytes of magic |
235  |---------------------------------|
236  | 32 bytes argument/sp save area |
237  |---------------------------------| (bprm->p)
238  | ELF auxiliary info |
239  | (up to 28 words) |
240  |---------------------------------|
241  | NULL |
242  |---------------------------------|
243  | Environment pointers |
244  |---------------------------------|
245  | NULL |
246  |---------------------------------|
247  | Argument pointers |
248  |---------------------------------| <- argv
249  | argc (1 word) |
250  |---------------------------------| <- bprm->exec (HACK!)
251  | N bytes of slack |
252  |---------------------------------|
253  | filename passed to execve |
254  |---------------------------------| (mm->env_end)
255  | env strings |
256  |---------------------------------| (mm->env_start, mm->arg_end)
257  | arg strings |
258  |---------------------------------|
259  | additional faked arg strings if |
260  | we're invoked via binfmt_script |
261  |---------------------------------| (mm->arg_start)
262  stack base is at TASK_SIZE - rlim_max.
263 
264 on downward growing arches, it looks like this:
265  stack base at TASK_SIZE
266  | filename passed to execve
267  | env strings
268  | arg strings
269  | faked arg strings
270  | slack
271  | ELF
272  | envps
273  | argvs
274  | argc
275 
276  * The pleasant part of this is that if we need to skip arguments we
277  * can just decrement argc and move argv, because the stack pointer
278  * is utterly unrelated to the location of the environment and
279  * argument vectors.
280  *
281  * Note that the S/390 people took the easy way out and hacked their
282  * GCC to make the stack grow downwards.
283  *
284  * Final Note: For entry from syscall, the W (wide) bit of the PSW
285  * is stuffed into the lowest bit of the user sp (%r30), so we fill
286  * it in here from the current->personality
287  */
288 
289 #ifdef CONFIG_64BIT
290 #define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
291 #else
292 #define USER_WIDE_MODE 0
293 #endif
294 
295 #define start_thread(regs, new_pc, new_sp) do { \
296  elf_addr_t *sp = (elf_addr_t *)new_sp; \
297  __u32 spaceid = (__u32)current->mm->context; \
298  elf_addr_t pc = (elf_addr_t)new_pc | 3; \
299  elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
300  \
301  regs->iasq[0] = spaceid; \
302  regs->iasq[1] = spaceid; \
303  regs->iaoq[0] = pc; \
304  regs->iaoq[1] = pc + 4; \
305  regs->sr[2] = LINUX_GATEWAY_SPACE; \
306  regs->sr[3] = 0xffff; \
307  regs->sr[4] = spaceid; \
308  regs->sr[5] = spaceid; \
309  regs->sr[6] = spaceid; \
310  regs->sr[7] = spaceid; \
311  regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
312  regs->fr[ 0] = 0LL; \
313  regs->fr[ 1] = 0LL; \
314  regs->fr[ 2] = 0LL; \
315  regs->fr[ 3] = 0LL; \
316  regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
317  regs->gr[31] = pc; \
318  \
319  get_user(regs->gr[25], (argv - 1)); \
320  regs->gr[24] = (long) argv; \
321  regs->gr[23] = 0; \
322 } while(0)
323 
324 struct task_struct;
325 struct mm_struct;
326 
327 /* Free all resources held by a thread. */
328 extern void release_thread(struct task_struct *);
329 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
330 
331 extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
332 
333 extern unsigned long get_wchan(struct task_struct *p);
334 
335 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
336 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
337 
338 #define cpu_relax() barrier()
339 
340 /* Used as a macro to identify the combined VIPT/PIPT cached
341  * CPUs which require a guarantee of coherency (no inequivalent
342  * aliases with different data, whether clean or not) to operate */
343 static inline int parisc_requires_coherency(void)
344 {
345 #ifdef CONFIG_PA8X00
346  return (boot_cpu_data.cpu_type == mako) ||
347  (boot_cpu_data.cpu_type == mako2);
348 #else
349  return 0;
350 #endif
351 }
352 
353 #endif /* __ASSEMBLY__ */
354 
355 #endif /* __ASM_PARISC_PROCESSOR_H */
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