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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#endif /* __ASSEMBLY__ */
21
22#define KERNEL_STACK_SIZE (4*PAGE_SIZE)
23
24/*
25 * Default implementation of macro that returns current
26 * instruction pointer ("program counter").
27 */
28#ifdef CONFIG_PA20
29#define current_ia(x) __asm__("mfia %0" : "=r"(x))
30#else /* mfia added in pa2.0 */
31#define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x))
32#endif
33#define current_text_addr() ({ void *pc; current_ia(pc); pc; })
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#endif
59
60#ifndef __ASSEMBLY__
61
62/*
63 * Data detected about CPUs at boot time which is the same for all CPU's.
64 * HP boxes are SMP - ie identical processors.
65 *
66 * FIXME: some CPU rev info may be processor specific...
67 */
68struct system_cpuinfo_parisc {
69 unsigned int cpu_count;
70 unsigned int cpu_hz;
71 unsigned int hversion;
72 unsigned int sversion;
73 enum cpu_type cpu_type;
74
75 struct {
76 struct pdc_model model;
77 unsigned long versions;
78 unsigned long cpuid;
79 unsigned long capabilities;
80 char sys_model_name[81]; /* PDC-ROM returnes this model name */
81 } pdc;
82
83 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */
84 const char *family_name; /* e.g. "1.1e" */
85};
86
87
88/* Per CPU data structure - ie varies per CPU. */
89struct cpuinfo_parisc {
90 unsigned long it_value; /* Interval Timer at last timer Intr */
91 unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */
92 unsigned long irq_count; /* number of IRQ's since boot */
93 unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
94 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
95 unsigned long hpa; /* Host Physical address */
96 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
97#ifdef CONFIG_SMP
98 unsigned long pending_ipi; /* bitmap of type ipi_message_type */
99 unsigned long ipi_count; /* number ipi Interrupts */
100#endif
101 unsigned long bh_count; /* number of times bh was invoked */
102 unsigned long prof_counter; /* per CPU profiling support */
103 unsigned long prof_multiplier; /* per CPU profiling support */
104 unsigned long fp_rev;
105 unsigned long fp_model;
106 unsigned int state;
107 struct parisc_device *dev;
108 unsigned long loops_per_jiffy;
109};
110
111extern struct system_cpuinfo_parisc boot_cpu_data;
112extern struct cpuinfo_parisc cpu_data[NR_CPUS];
113#define current_cpu_data cpu_data[smp_processor_id()]
114
115#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
116
117typedef struct {
118 int seg;
119} mm_segment_t;
120
121#define ARCH_MIN_TASKALIGN 8
122
123struct thread_struct {
124 struct pt_regs regs;
125 unsigned long task_size;
126 unsigned long map_base;
127 unsigned long flags;
128};
129
130/* Thread struct flags. */
131#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
132#define PARISC_UAC_SIGBUS (1UL << 1)
133#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
134
135#define PARISC_UAC_SHIFT 0
136#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
137
138#define SET_UNALIGN_CTL(task,value) \
139 ({ \
140 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
141 | (((value) << PARISC_UAC_SHIFT) & \
142 PARISC_UAC_MASK)); \
143 0; \
144 })
145
146#define GET_UNALIGN_CTL(task,addr) \
147 ({ \
148 put_user(((task)->thread.flags & PARISC_UAC_MASK) \
149 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \
150 })
151
152#define INIT_THREAD { \
153 .regs = { .gr = { 0, }, \
154 .fr = { 0, }, \
155 .sr = { 0, }, \
156 .iasq = { 0, }, \
157 .iaoq = { 0, }, \
158 .cr27 = 0, \
159 }, \
160 .task_size = DEFAULT_TASK_SIZE, \
161 .map_base = DEFAULT_MAP_BASE, \
162 .flags = 0 \
163 }
164
165/*
166 * Return saved PC of a blocked thread. This is used by ps mostly.
167 */
168
169unsigned long thread_saved_pc(struct task_struct *t);
170void show_trace(struct task_struct *task, unsigned long *stack);
171
172/*
173 * Start user thread in another space.
174 *
175 * Note that we set both the iaoq and r31 to the new pc. When
176 * the kernel initially calls execve it will return through an
177 * rfi path that will use the values in the iaoq. The execve
178 * syscall path will return through the gateway page, and
179 * that uses r31 to branch to.
180 *
181 * For ELF we clear r23, because the dynamic linker uses it to pass
182 * the address of the finalizer function.
183 *
184 * We also initialize sr3 to an illegal value (illegal for our
185 * implementation, not for the architecture).
186 */
187typedef unsigned int elf_caddr_t;
188
189#define start_thread_som(regs, new_pc, new_sp) do { \
190 unsigned long *sp = (unsigned long *)new_sp; \
191 __u32 spaceid = (__u32)current->mm->context; \
192 unsigned long pc = (unsigned long)new_pc; \
193 /* offset pc for priv. level */ \
194 pc |= 3; \
195 \
196 set_fs(USER_DS); \
197 regs->iasq[0] = spaceid; \
198 regs->iasq[1] = spaceid; \
199 regs->iaoq[0] = pc; \
200 regs->iaoq[1] = pc + 4; \
201 regs->sr[2] = LINUX_GATEWAY_SPACE; \
202 regs->sr[3] = 0xffff; \
203 regs->sr[4] = spaceid; \
204 regs->sr[5] = spaceid; \
205 regs->sr[6] = spaceid; \
206 regs->sr[7] = spaceid; \
207 regs->gr[ 0] = USER_PSW; \
208 regs->gr[30] = ((new_sp)+63)&~63; \
209 regs->gr[31] = pc; \
210 \
211 get_user(regs->gr[26],&sp[0]); \
212 get_user(regs->gr[25],&sp[-1]); \
213 get_user(regs->gr[24],&sp[-2]); \
214 get_user(regs->gr[23],&sp[-3]); \
215} while(0)
216
217/* The ELF abi wants things done a "wee bit" differently than
218 * som does. Supporting this behavior here avoids
219 * having our own version of create_elf_tables.
220 *
221 * Oh, and yes, that is not a typo, we are really passing argc in r25
222 * and argv in r24 (rather than r26 and r25). This is because that's
223 * where __libc_start_main wants them.
224 *
225 * Duplicated from dl-machine.h for the benefit of readers:
226 *
227 * Our initial stack layout is rather different from everyone else's
228 * due to the unique PA-RISC ABI. As far as I know it looks like
229 * this:
230
231 ----------------------------------- (user startup code creates this frame)
232 | 32 bytes of magic |
233 |---------------------------------|
234 | 32 bytes argument/sp save area |
235 |---------------------------------| (bprm->p)
236 | ELF auxiliary info |
237 | (up to 28 words) |
238 |---------------------------------|
239 | NULL |
240 |---------------------------------|
241 | Environment pointers |
242 |---------------------------------|
243 | NULL |
244 |---------------------------------|
245 | Argument pointers |
246 |---------------------------------| <- argv
247 | argc (1 word) |
248 |---------------------------------| <- bprm->exec (HACK!)
249 | N bytes of slack |
250 |---------------------------------|
251 | filename passed to execve |
252 |---------------------------------| (mm->env_end)
253 | env strings |
254 |---------------------------------| (mm->env_start, mm->arg_end)
255 | arg strings |
256 |---------------------------------|
257 | additional faked arg strings if |
258 | we're invoked via binfmt_script |
259 |---------------------------------| (mm->arg_start)
260 stack base is at TASK_SIZE - rlim_max.
261
262on downward growing arches, it looks like this:
263 stack base at TASK_SIZE
264 | filename passed to execve
265 | env strings
266 | arg strings
267 | faked arg strings
268 | slack
269 | ELF
270 | envps
271 | argvs
272 | argc
273
274 * The pleasant part of this is that if we need to skip arguments we
275 * can just decrement argc and move argv, because the stack pointer
276 * is utterly unrelated to the location of the environment and
277 * argument vectors.
278 *
279 * Note that the S/390 people took the easy way out and hacked their
280 * GCC to make the stack grow downwards.
281 *
282 * Final Note: For entry from syscall, the W (wide) bit of the PSW
283 * is stuffed into the lowest bit of the user sp (%r30), so we fill
284 * it in here from the current->personality
285 */
286
287#ifdef CONFIG_64BIT
288#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
289#else
290#define USER_WIDE_MODE 0
291#endif
292
293#define start_thread(regs, new_pc, new_sp) do { \
294 elf_addr_t *sp = (elf_addr_t *)new_sp; \
295 __u32 spaceid = (__u32)current->mm->context; \
296 elf_addr_t pc = (elf_addr_t)new_pc | 3; \
297 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
298 \
299 set_fs(USER_DS); \
300 regs->iasq[0] = spaceid; \
301 regs->iasq[1] = spaceid; \
302 regs->iaoq[0] = pc; \
303 regs->iaoq[1] = pc + 4; \
304 regs->sr[2] = LINUX_GATEWAY_SPACE; \
305 regs->sr[3] = 0xffff; \
306 regs->sr[4] = spaceid; \
307 regs->sr[5] = spaceid; \
308 regs->sr[6] = spaceid; \
309 regs->sr[7] = spaceid; \
310 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
311 regs->fr[ 0] = 0LL; \
312 regs->fr[ 1] = 0LL; \
313 regs->fr[ 2] = 0LL; \
314 regs->fr[ 3] = 0LL; \
315 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
316 regs->gr[31] = pc; \
317 \
318 get_user(regs->gr[25], (argv - 1)); \
319 regs->gr[24] = (long) argv; \
320 regs->gr[23] = 0; \
321} while(0)
322
323struct task_struct;
324struct mm_struct;
325
326/* Free all resources held by a thread. */
327extern void release_thread(struct task_struct *);
328extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
329
330/* Prepare to copy thread state - unlazy all lazy status */
331#define prepare_to_copy(tsk) do { } while (0)
332
333extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
334
335extern unsigned long get_wchan(struct task_struct *p);
336
337#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
338#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
339
340#define cpu_relax() barrier()
341
342/* Used as a macro to identify the combined VIPT/PIPT cached
343 * CPUs which require a guarantee of coherency (no inequivalent
344 * aliases with different data, whether clean or not) to operate */
345static inline int parisc_requires_coherency(void)
346{
347#ifdef CONFIG_PA8X00
348 return (boot_cpu_data.cpu_type == mako) ||
349 (boot_cpu_data.cpu_type == mako2);
350#else
351 return 0;
352#endif
353}
354
355#endif /* __ASSEMBLY__ */
356
357#endif /* __ASM_PARISC_PROCESSOR_H */