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Linux/arch/parisc/include/asm/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 #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 HAVE_ARCH_PICK_MMAP_LAYOUT
 34 
 35 #define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
 36 #define TASK_SIZE               TASK_SIZE_OF(current)
 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 CONFIG_64BIT
 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 #ifdef __KERNEL__
 51 
 52 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
 53  * prumpf */
 54 
 55 #define STACK_TOP       TASK_SIZE
 56 #define STACK_TOP_MAX   DEFAULT_TASK_SIZE
 57 
 58 /* Allow bigger stacks for 64-bit processes */
 59 #define STACK_SIZE_MAX  (USER_WIDE_MODE                                 \
 60                          ? (1 << 30)    /* 1 GB */                      \
 61                          : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))
 62 
 63 #endif
 64 
 65 #ifndef __ASSEMBLY__
 66 
 67 /*
 68  * Data detected about CPUs at boot time which is the same for all CPU's.
 69  * HP boxes are SMP - ie identical processors.
 70  *
 71  * FIXME: some CPU rev info may be processor specific...
 72  */
 73 struct system_cpuinfo_parisc {
 74         unsigned int    cpu_count;
 75         unsigned int    cpu_hz;
 76         unsigned int    hversion;
 77         unsigned int    sversion;
 78         enum cpu_type   cpu_type;
 79 
 80         struct {
 81                 struct pdc_model model;
 82                 unsigned long versions;
 83                 unsigned long cpuid;
 84                 unsigned long capabilities;
 85                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
 86         } pdc;
 87 
 88         const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
 89         const char      *family_name;   /* e.g. "1.1e" */
 90 };
 91 
 92 
 93 /* Per CPU data structure - ie varies per CPU.  */
 94 struct cpuinfo_parisc {
 95         unsigned long it_value;     /* Interval Timer at last timer Intr */
 96         unsigned long it_delta;     /* Interval delta (tic_10ms / HZ * 100) */
 97         unsigned long irq_count;    /* number of IRQ's since boot */
 98         unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
 99         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
100         unsigned long hpa;          /* Host Physical address */
101         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
102 #ifdef CONFIG_SMP
103         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
104 #endif
105         unsigned long bh_count;     /* number of times bh was invoked */
106         unsigned long prof_counter; /* per CPU profiling support */
107         unsigned long prof_multiplier;  /* per CPU profiling support */
108         unsigned long fp_rev;
109         unsigned long fp_model;
110         unsigned int state;
111         struct parisc_device *dev;
112         unsigned long loops_per_jiffy;
113 };
114 
115 extern struct system_cpuinfo_parisc boot_cpu_data;
116 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
117 
118 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
119 
120 typedef struct {
121         int seg;  
122 } mm_segment_t;
123 
124 #define ARCH_MIN_TASKALIGN      8
125 
126 struct thread_struct {
127         struct pt_regs regs;
128         unsigned long  task_size;
129         unsigned long  map_base;
130         unsigned long  flags;
131 }; 
132 
133 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
134 
135 /* Thread struct flags. */
136 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
137 #define PARISC_UAC_SIGBUS       (1UL << 1)
138 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
139 
140 #define PARISC_UAC_SHIFT        0
141 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
142 
143 #define SET_UNALIGN_CTL(task,value)                                       \
144         ({                                                                \
145         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
146                                 | (((value) << PARISC_UAC_SHIFT) &        \
147                                    PARISC_UAC_MASK));                     \
148         0;                                                                \
149         })
150 
151 #define GET_UNALIGN_CTL(task,addr)                                        \
152         ({                                                                \
153         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
154                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
155         })
156 
157 #define INIT_THREAD { \
158         .regs = {       .gr     = { 0, }, \
159                         .fr     = { 0, }, \
160                         .sr     = { 0, }, \
161                         .iasq   = { 0, }, \
162                         .iaoq   = { 0, }, \
163                         .cr27   = 0, \
164                 }, \
165         .task_size      = DEFAULT_TASK_SIZE, \
166         .map_base       = DEFAULT_MAP_BASE, \
167         .flags          = 0 \
168         }
169 
170 /*
171  * Return saved PC of a blocked thread.  This is used by ps mostly.
172  */
173 
174 struct task_struct;
175 unsigned long thread_saved_pc(struct task_struct *t);
176 void show_trace(struct task_struct *task, unsigned long *stack);
177 
178 /*
179  * Start user thread in another space.
180  *
181  * Note that we set both the iaoq and r31 to the new pc. When
182  * the kernel initially calls execve it will return through an
183  * rfi path that will use the values in the iaoq. The execve
184  * syscall path will return through the gateway page, and
185  * that uses r31 to branch to.
186  *
187  * For ELF we clear r23, because the dynamic linker uses it to pass
188  * the address of the finalizer function.
189  *
190  * We also initialize sr3 to an illegal value (illegal for our
191  * implementation, not for the architecture).
192  */
193 typedef unsigned int elf_caddr_t;
194 
195 #define start_thread_som(regs, new_pc, new_sp) do {     \
196         unsigned long *sp = (unsigned long *)new_sp;    \
197         __u32 spaceid = (__u32)current->mm->context;    \
198         unsigned long pc = (unsigned long)new_pc;       \
199         /* offset pc for priv. level */                 \
200         pc |= 3;                                        \
201                                                         \
202         regs->iasq[0] = spaceid;                        \
203         regs->iasq[1] = spaceid;                        \
204         regs->iaoq[0] = pc;                             \
205         regs->iaoq[1] = pc + 4;                         \
206         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
207         regs->sr[3] = 0xffff;                           \
208         regs->sr[4] = spaceid;                          \
209         regs->sr[5] = spaceid;                          \
210         regs->sr[6] = spaceid;                          \
211         regs->sr[7] = spaceid;                          \
212         regs->gr[ 0] = USER_PSW;                        \
213         regs->gr[30] = ((new_sp)+63)&~63;               \
214         regs->gr[31] = pc;                              \
215                                                         \
216         get_user(regs->gr[26],&sp[0]);                  \
217         get_user(regs->gr[25],&sp[-1]);                 \
218         get_user(regs->gr[24],&sp[-2]);                 \
219         get_user(regs->gr[23],&sp[-3]);                 \
220 } while(0)
221 
222 /* The ELF abi wants things done a "wee bit" differently than
223  * som does.  Supporting this behavior here avoids
224  * having our own version of create_elf_tables.
225  *
226  * Oh, and yes, that is not a typo, we are really passing argc in r25
227  * and argv in r24 (rather than r26 and r25).  This is because that's
228  * where __libc_start_main wants them.
229  *
230  * Duplicated from dl-machine.h for the benefit of readers:
231  *
232  *  Our initial stack layout is rather different from everyone else's
233  *  due to the unique PA-RISC ABI.  As far as I know it looks like
234  *  this:
235 
236    -----------------------------------  (user startup code creates this frame)
237    |         32 bytes of magic       |
238    |---------------------------------|
239    | 32 bytes argument/sp save area  |
240    |---------------------------------| (bprm->p)
241    |        ELF auxiliary info       |
242    |         (up to 28 words)        |
243    |---------------------------------|
244    |               NULL              |
245    |---------------------------------|
246    |       Environment pointers      |
247    |---------------------------------|
248    |               NULL              |
249    |---------------------------------|
250    |        Argument pointers        |
251    |---------------------------------| <- argv
252    |          argc (1 word)          |
253    |---------------------------------| <- bprm->exec (HACK!)
254    |         N bytes of slack        |
255    |---------------------------------|
256    |    filename passed to execve    |
257    |---------------------------------| (mm->env_end)
258    |           env strings           |
259    |---------------------------------| (mm->env_start, mm->arg_end)
260    |           arg strings           |
261    |---------------------------------|
262    | additional faked arg strings if |
263    | we're invoked via binfmt_script |
264    |---------------------------------| (mm->arg_start)
265    stack base is at TASK_SIZE - rlim_max.
266 
267 on downward growing arches, it looks like this:
268    stack base at TASK_SIZE
269    | filename passed to execve
270    | env strings
271    | arg strings
272    | faked arg strings
273    | slack
274    | ELF
275    | envps
276    | argvs
277    | argc
278 
279  *  The pleasant part of this is that if we need to skip arguments we
280  *  can just decrement argc and move argv, because the stack pointer
281  *  is utterly unrelated to the location of the environment and
282  *  argument vectors.
283  *
284  * Note that the S/390 people took the easy way out and hacked their
285  * GCC to make the stack grow downwards.
286  *
287  * Final Note: For entry from syscall, the W (wide) bit of the PSW
288  * is stuffed into the lowest bit of the user sp (%r30), so we fill
289  * it in here from the current->personality
290  */
291 
292 #ifdef CONFIG_64BIT
293 #define USER_WIDE_MODE  (!test_thread_flag(TIF_32BIT))
294 #else
295 #define USER_WIDE_MODE  0
296 #endif
297 
298 #define start_thread(regs, new_pc, new_sp) do {         \
299         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
300         __u32 spaceid = (__u32)current->mm->context;    \
301         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
302         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
303                                                         \
304         regs->iasq[0] = spaceid;                        \
305         regs->iasq[1] = spaceid;                        \
306         regs->iaoq[0] = pc;                             \
307         regs->iaoq[1] = pc + 4;                         \
308         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
309         regs->sr[3] = 0xffff;                           \
310         regs->sr[4] = spaceid;                          \
311         regs->sr[5] = spaceid;                          \
312         regs->sr[6] = spaceid;                          \
313         regs->sr[7] = spaceid;                          \
314         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
315         regs->fr[ 0] = 0LL;                             \
316         regs->fr[ 1] = 0LL;                             \
317         regs->fr[ 2] = 0LL;                             \
318         regs->fr[ 3] = 0LL;                             \
319         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
320         regs->gr[31] = pc;                              \
321                                                         \
322         get_user(regs->gr[25], (argv - 1));             \
323         regs->gr[24] = (long) argv;                     \
324         regs->gr[23] = 0;                               \
325 } while(0)
326 
327 struct task_struct;
328 struct mm_struct;
329 
330 /* Free all resources held by a thread. */
331 extern void release_thread(struct task_struct *);
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 #define cpu_relax_lowlatency() cpu_relax()
340 
341 /* Used as a macro to identify the combined VIPT/PIPT cached
342  * CPUs which require a guarantee of coherency (no inequivalent
343  * aliases with different data, whether clean or not) to operate */
344 static inline int parisc_requires_coherency(void)
345 {
346 #ifdef CONFIG_PA8X00
347         return (boot_cpu_data.cpu_type == mako) ||
348                 (boot_cpu_data.cpu_type == mako2);
349 #else
350         return 0;
351 #endif
352 }
353 
354 #endif /* __ASSEMBLY__ */
355 
356 #endif /* __ASM_PARISC_PROCESSOR_H */
357 

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