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 /* The ELF abi wants things done a "wee bit" differently than
196 * som does. Supporting this behavior here avoids
197 * having our own version of create_elf_tables.
198 *
199 * Oh, and yes, that is not a typo, we are really passing argc in r25
200 * and argv in r24 (rather than r26 and r25). This is because that's
201 * where __libc_start_main wants them.
202 *
203 * Duplicated from dl-machine.h for the benefit of readers:
204 *
205 * Our initial stack layout is rather different from everyone else's
206 * due to the unique PA-RISC ABI. As far as I know it looks like
207 * this:
208
209 ----------------------------------- (user startup code creates this frame)
210 | 32 bytes of magic |
211 |---------------------------------|
212 | 32 bytes argument/sp save area |
213 |---------------------------------| (bprm->p)
214 | ELF auxiliary info |
215 | (up to 28 words) |
216 |---------------------------------|
217 | NULL |
218 |---------------------------------|
219 | Environment pointers |
220 |---------------------------------|
221 | NULL |
222 |---------------------------------|
223 | Argument pointers |
224 |---------------------------------| <- argv
225 | argc (1 word) |
226 |---------------------------------| <- bprm->exec (HACK!)
227 | N bytes of slack |
228 |---------------------------------|
229 | filename passed to execve |
230 |---------------------------------| (mm->env_end)
231 | env strings |
232 |---------------------------------| (mm->env_start, mm->arg_end)
233 | arg strings |
234 |---------------------------------|
235 | additional faked arg strings if |
236 | we're invoked via binfmt_script |
237 |---------------------------------| (mm->arg_start)
238 stack base is at TASK_SIZE - rlim_max.
239
240 on downward growing arches, it looks like this:
241 stack base at TASK_SIZE
242 | filename passed to execve
243 | env strings
244 | arg strings
245 | faked arg strings
246 | slack
247 | ELF
248 | envps
249 | argvs
250 | argc
251
252 * The pleasant part of this is that if we need to skip arguments we
253 * can just decrement argc and move argv, because the stack pointer
254 * is utterly unrelated to the location of the environment and
255 * argument vectors.
256 *
257 * Note that the S/390 people took the easy way out and hacked their
258 * GCC to make the stack grow downwards.
259 *
260 * Final Note: For entry from syscall, the W (wide) bit of the PSW
261 * is stuffed into the lowest bit of the user sp (%r30), so we fill
262 * it in here from the current->personality
263 */
264
265 #ifdef CONFIG_64BIT
266 #define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
267 #else
268 #define USER_WIDE_MODE 0
269 #endif
270
271 #define start_thread(regs, new_pc, new_sp) do { \
272 elf_addr_t *sp = (elf_addr_t *)new_sp; \
273 __u32 spaceid = (__u32)current->mm->context; \
274 elf_addr_t pc = (elf_addr_t)new_pc | 3; \
275 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
276 \
277 regs->iasq[0] = spaceid; \
278 regs->iasq[1] = spaceid; \
279 regs->iaoq[0] = pc; \
280 regs->iaoq[1] = pc + 4; \
281 regs->sr[2] = LINUX_GATEWAY_SPACE; \
282 regs->sr[3] = 0xffff; \
283 regs->sr[4] = spaceid; \
284 regs->sr[5] = spaceid; \
285 regs->sr[6] = spaceid; \
286 regs->sr[7] = spaceid; \
287 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
288 regs->fr[ 0] = 0LL; \
289 regs->fr[ 1] = 0LL; \
290 regs->fr[ 2] = 0LL; \
291 regs->fr[ 3] = 0LL; \
292 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
293 regs->gr[31] = pc; \
294 \
295 get_user(regs->gr[25], (argv - 1)); \
296 regs->gr[24] = (long) argv; \
297 regs->gr[23] = 0; \
298 } while(0)
299
300 struct task_struct;
301 struct mm_struct;
302
303 /* Free all resources held by a thread. */
304 extern void release_thread(struct task_struct *);
305
306 extern unsigned long get_wchan(struct task_struct *p);
307
308 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
309 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
310
311 #define cpu_relax() barrier()
312 #define cpu_relax_lowlatency() cpu_relax()
313
314 /* Used as a macro to identify the combined VIPT/PIPT cached
315 * CPUs which require a guarantee of coherency (no inequivalent
316 * aliases with different data, whether clean or not) to operate */
parisc_requires_coherency(void)317 static inline int parisc_requires_coherency(void)
318 {
319 #ifdef CONFIG_PA8X00
320 return (boot_cpu_data.cpu_type == mako) ||
321 (boot_cpu_data.cpu_type == mako2);
322 #else
323 return 0;
324 #endif
325 }
326
327 #endif /* __ASSEMBLY__ */
328
329 #endif /* __ASM_PARISC_PROCESSOR_H */
330