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Linux/arch/parisc/include/asm/processor.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * include/asm-parisc/processor.h
  4  *
  5  * Copyright (C) 1994 Linus Torvalds
  6  * Copyright (C) 2001 Grant Grundler
  7  */
  8 
  9 #ifndef __ASM_PARISC_PROCESSOR_H
 10 #define __ASM_PARISC_PROCESSOR_H
 11 
 12 #ifndef __ASSEMBLY__
 13 #include <linux/threads.h>
 14 
 15 #include <asm/prefetch.h>
 16 #include <asm/hardware.h>
 17 #include <asm/pdc.h>
 18 #include <asm/ptrace.h>
 19 #include <asm/types.h>
 20 #include <asm/percpu.h>
 21 #endif /* __ASSEMBLY__ */
 22 
 23 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 24 
 25 #define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
 26 #define TASK_SIZE               TASK_SIZE_OF(current)
 27 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
 28 
 29 #define DEFAULT_TASK_SIZE32     (0xFFF00000UL)
 30 #define DEFAULT_MAP_BASE32      (0x40000000UL)
 31 
 32 #ifdef CONFIG_64BIT
 33 #define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
 34 #define DEFAULT_MAP_BASE        (0x200000000UL)
 35 #else
 36 #define DEFAULT_TASK_SIZE       DEFAULT_TASK_SIZE32
 37 #define DEFAULT_MAP_BASE        DEFAULT_MAP_BASE32
 38 #endif
 39 
 40 #ifdef __KERNEL__
 41 
 42 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
 43  * prumpf */
 44 
 45 #define STACK_TOP       TASK_SIZE
 46 #define STACK_TOP_MAX   DEFAULT_TASK_SIZE
 47 
 48 /* Allow bigger stacks for 64-bit processes */
 49 #define STACK_SIZE_MAX  (USER_WIDE_MODE                                 \
 50                          ? (1 << 30)    /* 1 GB */                      \
 51                          : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))
 52 
 53 #endif
 54 
 55 #ifndef __ASSEMBLY__
 56 
 57 /*
 58  * Data detected about CPUs at boot time which is the same for all CPU's.
 59  * HP boxes are SMP - ie identical processors.
 60  *
 61  * FIXME: some CPU rev info may be processor specific...
 62  */
 63 struct system_cpuinfo_parisc {
 64         unsigned int    cpu_count;
 65         unsigned int    cpu_hz;
 66         unsigned int    hversion;
 67         unsigned int    sversion;
 68         enum cpu_type   cpu_type;
 69 
 70         struct {
 71                 struct pdc_model model;
 72                 unsigned long versions;
 73                 unsigned long cpuid;
 74                 unsigned long capabilities;
 75                 char   sys_model_name[81]; /* PDC-ROM returnes this model name */
 76         } pdc;
 77 
 78         const char      *cpu_name;      /* e.g. "PA7300LC (PCX-L2)" */
 79         const char      *family_name;   /* e.g. "1.1e" */
 80 };
 81 
 82 
 83 /* Per CPU data structure - ie varies per CPU.  */
 84 struct cpuinfo_parisc {
 85         unsigned long it_value;     /* Interval Timer at last timer Intr */
 86         unsigned long irq_count;    /* number of IRQ's since boot */
 87         unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
 88         unsigned long hpa;          /* Host Physical address */
 89         unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
 90 #ifdef CONFIG_SMP
 91         unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
 92 #endif
 93         unsigned long bh_count;     /* number of times bh was invoked */
 94         unsigned long fp_rev;
 95         unsigned long fp_model;
 96         unsigned long cpu_num;      /* CPU number from PAT firmware */
 97         unsigned long cpu_loc;      /* CPU location from PAT firmware */
 98         unsigned int state;
 99         struct parisc_device *dev;
100         unsigned long loops_per_jiffy;
101 };
102 
103 extern struct system_cpuinfo_parisc boot_cpu_data;
104 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
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 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
122 
123 /* Thread struct flags. */
124 #define PARISC_UAC_NOPRINT      (1UL << 0)      /* see prctl and unaligned.c */
125 #define PARISC_UAC_SIGBUS       (1UL << 1)
126 #define PARISC_KERNEL_DEATH     (1UL << 31)     /* see die_if_kernel()... */
127 
128 #define PARISC_UAC_SHIFT        0
129 #define PARISC_UAC_MASK         (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
130 
131 #define SET_UNALIGN_CTL(task,value)                                       \
132         ({                                                                \
133         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
134                                 | (((value) << PARISC_UAC_SHIFT) &        \
135                                    PARISC_UAC_MASK));                     \
136         0;                                                                \
137         })
138 
139 #define GET_UNALIGN_CTL(task,addr)                                        \
140         ({                                                                \
141         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
142                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
143         })
144 
145 #define INIT_THREAD { \
146         .regs = {       .gr     = { 0, }, \
147                         .fr     = { 0, }, \
148                         .sr     = { 0, }, \
149                         .iasq   = { 0, }, \
150                         .iaoq   = { 0, }, \
151                         .cr27   = 0, \
152                 }, \
153         .task_size      = DEFAULT_TASK_SIZE, \
154         .map_base       = DEFAULT_MAP_BASE, \
155         .flags          = 0 \
156         }
157 
158 struct task_struct;
159 void show_trace(struct task_struct *task, unsigned long *stack);
160 
161 /*
162  * Start user thread in another space.
163  *
164  * Note that we set both the iaoq and r31 to the new pc. When
165  * the kernel initially calls execve it will return through an
166  * rfi path that will use the values in the iaoq. The execve
167  * syscall path will return through the gateway page, and
168  * that uses r31 to branch to.
169  *
170  * For ELF we clear r23, because the dynamic linker uses it to pass
171  * the address of the finalizer function.
172  *
173  * We also initialize sr3 to an illegal value (illegal for our
174  * implementation, not for the architecture).
175  */
176 typedef unsigned int elf_caddr_t;
177 
178 /* The ELF abi wants things done a "wee bit" differently than
179  * som does.  Supporting this behavior here avoids
180  * having our own version of create_elf_tables.
181  *
182  * Oh, and yes, that is not a typo, we are really passing argc in r25
183  * and argv in r24 (rather than r26 and r25).  This is because that's
184  * where __libc_start_main wants them.
185  *
186  * Duplicated from dl-machine.h for the benefit of readers:
187  *
188  *  Our initial stack layout is rather different from everyone else's
189  *  due to the unique PA-RISC ABI.  As far as I know it looks like
190  *  this:
191 
192    -----------------------------------  (user startup code creates this frame)
193    |         32 bytes of magic       |
194    |---------------------------------|
195    | 32 bytes argument/sp save area  |
196    |---------------------------------| (bprm->p)
197    |        ELF auxiliary info       |
198    |         (up to 28 words)        |
199    |---------------------------------|
200    |               NULL              |
201    |---------------------------------|
202    |       Environment pointers      |
203    |---------------------------------|
204    |               NULL              |
205    |---------------------------------|
206    |        Argument pointers        |
207    |---------------------------------| <- argv
208    |          argc (1 word)          |
209    |---------------------------------| <- bprm->exec (HACK!)
210    |         N bytes of slack        |
211    |---------------------------------|
212    |    filename passed to execve    |
213    |---------------------------------| (mm->env_end)
214    |           env strings           |
215    |---------------------------------| (mm->env_start, mm->arg_end)
216    |           arg strings           |
217    |---------------------------------|
218    | additional faked arg strings if |
219    | we're invoked via binfmt_script |
220    |---------------------------------| (mm->arg_start)
221    stack base is at TASK_SIZE - rlim_max.
222 
223 on downward growing arches, it looks like this:
224    stack base at TASK_SIZE
225    | filename passed to execve
226    | env strings
227    | arg strings
228    | faked arg strings
229    | slack
230    | ELF
231    | envps
232    | argvs
233    | argc
234 
235  *  The pleasant part of this is that if we need to skip arguments we
236  *  can just decrement argc and move argv, because the stack pointer
237  *  is utterly unrelated to the location of the environment and
238  *  argument vectors.
239  *
240  * Note that the S/390 people took the easy way out and hacked their
241  * GCC to make the stack grow downwards.
242  *
243  * Final Note: For entry from syscall, the W (wide) bit of the PSW
244  * is stuffed into the lowest bit of the user sp (%r30), so we fill
245  * it in here from the current->personality
246  */
247 
248 #define USER_WIDE_MODE  (!is_32bit_task())
249 
250 #define start_thread(regs, new_pc, new_sp) do {         \
251         elf_addr_t *sp = (elf_addr_t *)new_sp;          \
252         __u32 spaceid = (__u32)current->mm->context;    \
253         elf_addr_t pc = (elf_addr_t)new_pc | 3;         \
254         elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;      \
255                                                         \
256         regs->iasq[0] = spaceid;                        \
257         regs->iasq[1] = spaceid;                        \
258         regs->iaoq[0] = pc;                             \
259         regs->iaoq[1] = pc + 4;                         \
260         regs->sr[2] = LINUX_GATEWAY_SPACE;              \
261         regs->sr[3] = 0xffff;                           \
262         regs->sr[4] = spaceid;                          \
263         regs->sr[5] = spaceid;                          \
264         regs->sr[6] = spaceid;                          \
265         regs->sr[7] = spaceid;                          \
266         regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
267         regs->fr[ 0] = 0LL;                             \
268         regs->fr[ 1] = 0LL;                             \
269         regs->fr[ 2] = 0LL;                             \
270         regs->fr[ 3] = 0LL;                             \
271         regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
272         regs->gr[31] = pc;                              \
273                                                         \
274         get_user(regs->gr[25], (argv - 1));             \
275         regs->gr[24] = (long) argv;                     \
276         regs->gr[23] = 0;                               \
277 } while(0)
278 
279 struct task_struct;
280 struct mm_struct;
281 
282 /* Free all resources held by a thread. */
283 extern void release_thread(struct task_struct *);
284 
285 extern unsigned long get_wchan(struct task_struct *p);
286 
287 #define KSTK_EIP(tsk)   ((tsk)->thread.regs.iaoq[0])
288 #define KSTK_ESP(tsk)   ((tsk)->thread.regs.gr[30])
289 
290 #define cpu_relax()     barrier()
291 
292 /*
293  * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
294  * cached CPUs which require a guarantee of coherency (no inequivalent aliases
295  * with different data, whether clean or not) to operate
296  */
297 #ifdef CONFIG_PA8X00
298 extern int _parisc_requires_coherency;
299 #define parisc_requires_coherency()     _parisc_requires_coherency
300 #else
301 #define parisc_requires_coherency()     (0)
302 #endif
303 
304 extern int running_on_qemu;
305 
306 #endif /* __ASSEMBLY__ */
307 
308 #endif /* __ASM_PARISC_PROCESSOR_H */
309 

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