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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/system.h>
20#include <asm/percpu.h>
21
22#endif /* __ASSEMBLY__ */
23
24#define KERNEL_STACK_SIZE (4*PAGE_SIZE)
25
26/*
27 * Default implementation of macro that returns current
28 * instruction pointer ("program counter").
29 */
30#ifdef CONFIG_PA20
31#define current_ia(x) __asm__("mfia %0" : "=r"(x))
32#else /* mfia added in pa2.0 */
33#define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x))
34#endif
35#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
36
37#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
38#define TASK_SIZE TASK_SIZE_OF(current)
39#define TASK_UNMAPPED_BASE (current->thread.map_base)
40
41#define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
42#define DEFAULT_MAP_BASE32 (0x40000000UL)
43
44#ifdef CONFIG_64BIT
45#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
46#define DEFAULT_MAP_BASE (0x200000000UL)
47#else
48#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
49#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
50#endif
51
52#ifdef __KERNEL__
53
54/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
55 * prumpf */
56
57#define STACK_TOP TASK_SIZE
58#define STACK_TOP_MAX DEFAULT_TASK_SIZE
59
60#endif
61
62#ifndef __ASSEMBLY__
63
64/*
65 * Data detected about CPUs at boot time which is the same for all CPU's.
66 * HP boxes are SMP - ie identical processors.
67 *
68 * FIXME: some CPU rev info may be processor specific...
69 */
70struct system_cpuinfo_parisc {
71 unsigned int cpu_count;
72 unsigned int cpu_hz;
73 unsigned int hversion;
74 unsigned int sversion;
75 enum cpu_type cpu_type;
76
77 struct {
78 struct pdc_model model;
79 unsigned long versions;
80 unsigned long cpuid;
81 unsigned long capabilities;
82 char sys_model_name[81]; /* PDC-ROM returnes this model name */
83 } pdc;
84
85 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */
86 const char *family_name; /* e.g. "1.1e" */
87};
88
89
90/* Per CPU data structure - ie varies per CPU. */
91struct cpuinfo_parisc {
92 unsigned long it_value; /* Interval Timer at last timer Intr */
93 unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */
94 unsigned long irq_count; /* number of IRQ's since boot */
95 unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
96 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
97 unsigned long hpa; /* Host Physical address */
98 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
99#ifdef CONFIG_SMP
100 unsigned long pending_ipi; /* bitmap of type ipi_message_type */
101 unsigned long ipi_count; /* number ipi Interrupts */
102#endif
103 unsigned long bh_count; /* number of times bh was invoked */
104 unsigned long prof_counter; /* per CPU profiling support */
105 unsigned long prof_multiplier; /* per CPU profiling support */
106 unsigned long fp_rev;
107 unsigned long fp_model;
108 unsigned int state;
109 struct parisc_device *dev;
110 unsigned long loops_per_jiffy;
111};
112
113extern struct system_cpuinfo_parisc boot_cpu_data;
114DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
115
116#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
117
118typedef struct {
119 int seg;
120} mm_segment_t;
121
122#define ARCH_MIN_TASKALIGN 8
123
124struct thread_struct {
125 struct pt_regs regs;
126 unsigned long task_size;
127 unsigned long map_base;
128 unsigned long flags;
129};
130
131#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
132
133/* Thread struct flags. */
134#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
135#define PARISC_UAC_SIGBUS (1UL << 1)
136#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
137
138#define PARISC_UAC_SHIFT 0
139#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
140
141#define SET_UNALIGN_CTL(task,value) \
142 ({ \
143 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
144 | (((value) << PARISC_UAC_SHIFT) & \
145 PARISC_UAC_MASK)); \
146 0; \
147 })
148
149#define GET_UNALIGN_CTL(task,addr) \
150 ({ \
151 put_user(((task)->thread.flags & PARISC_UAC_MASK) \
152 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \
153 })
154
155#define INIT_THREAD { \
156 .regs = { .gr = { 0, }, \
157 .fr = { 0, }, \
158 .sr = { 0, }, \
159 .iasq = { 0, }, \
160 .iaoq = { 0, }, \
161 .cr27 = 0, \
162 }, \
163 .task_size = DEFAULT_TASK_SIZE, \
164 .map_base = DEFAULT_MAP_BASE, \
165 .flags = 0 \
166 }
167
168/*
169 * Return saved PC of a blocked thread. This is used by ps mostly.
170 */
171
172unsigned long thread_saved_pc(struct task_struct *t);
173void 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 */
190typedef 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 set_fs(USER_DS); \
200 regs->iasq[0] = spaceid; \
201 regs->iasq[1] = spaceid; \
202 regs->iaoq[0] = pc; \
203 regs->iaoq[1] = pc + 4; \
204 regs->sr[2] = LINUX_GATEWAY_SPACE; \
205 regs->sr[3] = 0xffff; \
206 regs->sr[4] = spaceid; \
207 regs->sr[5] = spaceid; \
208 regs->sr[6] = spaceid; \
209 regs->sr[7] = spaceid; \
210 regs->gr[ 0] = USER_PSW; \
211 regs->gr[30] = ((new_sp)+63)&~63; \
212 regs->gr[31] = pc; \
213 \
214 get_user(regs->gr[26],&sp[0]); \
215 get_user(regs->gr[25],&sp[-1]); \
216 get_user(regs->gr[24],&sp[-2]); \
217 get_user(regs->gr[23],&sp[-3]); \
218} while(0)
219
220/* The ELF abi wants things done a "wee bit" differently than
221 * som does. Supporting this behavior here avoids
222 * having our own version of create_elf_tables.
223 *
224 * Oh, and yes, that is not a typo, we are really passing argc in r25
225 * and argv in r24 (rather than r26 and r25). This is because that's
226 * where __libc_start_main wants them.
227 *
228 * Duplicated from dl-machine.h for the benefit of readers:
229 *
230 * Our initial stack layout is rather different from everyone else's
231 * due to the unique PA-RISC ABI. As far as I know it looks like
232 * this:
233
234 ----------------------------------- (user startup code creates this frame)
235 | 32 bytes of magic |
236 |---------------------------------|
237 | 32 bytes argument/sp save area |
238 |---------------------------------| (bprm->p)
239 | ELF auxiliary info |
240 | (up to 28 words) |
241 |---------------------------------|
242 | NULL |
243 |---------------------------------|
244 | Environment pointers |
245 |---------------------------------|
246 | NULL |
247 |---------------------------------|
248 | Argument pointers |
249 |---------------------------------| <- argv
250 | argc (1 word) |
251 |---------------------------------| <- bprm->exec (HACK!)
252 | N bytes of slack |
253 |---------------------------------|
254 | filename passed to execve |
255 |---------------------------------| (mm->env_end)
256 | env strings |
257 |---------------------------------| (mm->env_start, mm->arg_end)
258 | arg strings |
259 |---------------------------------|
260 | additional faked arg strings if |
261 | we're invoked via binfmt_script |
262 |---------------------------------| (mm->arg_start)
263 stack base is at TASK_SIZE - rlim_max.
264
265on downward growing arches, it looks like this:
266 stack base at TASK_SIZE
267 | filename passed to execve
268 | env strings
269 | arg strings
270 | faked arg strings
271 | slack
272 | ELF
273 | envps
274 | argvs
275 | argc
276
277 * The pleasant part of this is that if we need to skip arguments we
278 * can just decrement argc and move argv, because the stack pointer
279 * is utterly unrelated to the location of the environment and
280 * argument vectors.
281 *
282 * Note that the S/390 people took the easy way out and hacked their
283 * GCC to make the stack grow downwards.
284 *
285 * Final Note: For entry from syscall, the W (wide) bit of the PSW
286 * is stuffed into the lowest bit of the user sp (%r30), so we fill
287 * it in here from the current->personality
288 */
289
290#ifdef CONFIG_64BIT
291#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
292#else
293#define USER_WIDE_MODE 0
294#endif
295
296#define start_thread(regs, new_pc, new_sp) do { \
297 elf_addr_t *sp = (elf_addr_t *)new_sp; \
298 __u32 spaceid = (__u32)current->mm->context; \
299 elf_addr_t pc = (elf_addr_t)new_pc | 3; \
300 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
301 \
302 set_fs(USER_DS); \
303 regs->iasq[0] = spaceid; \
304 regs->iasq[1] = spaceid; \
305 regs->iaoq[0] = pc; \
306 regs->iaoq[1] = pc + 4; \
307 regs->sr[2] = LINUX_GATEWAY_SPACE; \
308 regs->sr[3] = 0xffff; \
309 regs->sr[4] = spaceid; \
310 regs->sr[5] = spaceid; \
311 regs->sr[6] = spaceid; \
312 regs->sr[7] = spaceid; \
313 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
314 regs->fr[ 0] = 0LL; \
315 regs->fr[ 1] = 0LL; \
316 regs->fr[ 2] = 0LL; \
317 regs->fr[ 3] = 0LL; \
318 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
319 regs->gr[31] = pc; \
320 \
321 get_user(regs->gr[25], (argv - 1)); \
322 regs->gr[24] = (long) argv; \
323 regs->gr[23] = 0; \
324} while(0)
325
326struct task_struct;
327struct mm_struct;
328
329/* Free all resources held by a thread. */
330extern void release_thread(struct task_struct *);
331extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
332
333/* Prepare to copy thread state - unlazy all lazy status */
334#define prepare_to_copy(tsk) do { } while (0)
335
336extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
337
338extern unsigned long get_wchan(struct task_struct *p);
339
340#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
341#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
342
343#define cpu_relax() barrier()
344
345/* Used as a macro to identify the combined VIPT/PIPT cached
346 * CPUs which require a guarantee of coherency (no inequivalent
347 * aliases with different data, whether clean or not) to operate */
348static inline int parisc_requires_coherency(void)
349{
350#ifdef CONFIG_PA8X00
351 return (boot_cpu_data.cpu_type == mako) ||
352 (boot_cpu_data.cpu_type == mako2);
353#else
354 return 0;
355#endif
356}
357
358#endif /* __ASSEMBLY__ */
359
360#endif /* __ASM_PARISC_PROCESSOR_H */