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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/config.h>
13#include <linux/threads.h>
14
15#include <asm/hardware.h>
16#include <asm/page.h>
17#include <asm/pdc.h>
18#include <asm/ptrace.h>
19#include <asm/types.h>
20#include <asm/system.h>
21#endif /* __ASSEMBLY__ */
22
23#define KERNEL_STACK_SIZE (4*PAGE_SIZE)
24
25/*
26 * Default implementation of macro that returns current
27 * instruction pointer ("program counter").
28 */
29
30/* We cannot use MFIA as it was added for PA2.0 - prumpf
31
32 At one point there were no "0f/0b" type local symbols in gas for
33 PA-RISC. This is no longer true, but this still seems like the
34 nicest way to implement this. */
35
36#define current_text_addr() ({ void *pc; __asm__("\n\tblr 0,%0\n\tnop":"=r" (pc)); pc; })
37
38#define TASK_SIZE (current->thread.task_size)
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 __LP64__
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#ifndef __ASSEMBLY__
53
54/*
55 * Data detected about CPUs at boot time which is the same for all CPU's.
56 * HP boxes are SMP - ie identical processors.
57 *
58 * FIXME: some CPU rev info may be processor specific...
59 */
60struct system_cpuinfo_parisc {
61 unsigned int cpu_count;
62 unsigned int cpu_hz;
63 unsigned int hversion;
64 unsigned int sversion;
65 enum cpu_type cpu_type;
66
67 struct {
68 struct pdc_model model;
69 unsigned long versions;
70 unsigned long cpuid;
71 unsigned long capabilities;
72 char sys_model_name[81]; /* PDC-ROM returnes this model name */
73 } pdc;
74
75 char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */
76 char *family_name; /* e.g. "1.1e" */
77};
78
79
80/* Per CPU data structure - ie varies per CPU. */
81struct cpuinfo_parisc {
82 unsigned long it_value; /* Interval Timer at last timer Intr */
83 unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */
84 unsigned long irq_count; /* number of IRQ's since boot */
85 unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
86 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
87 unsigned long hpa; /* Host Physical address */
88 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
89#ifdef CONFIG_SMP
90 spinlock_t lock; /* synchronization for ipi's */
91 unsigned long pending_ipi; /* bitmap of type ipi_message_type */
92 unsigned long ipi_count; /* number ipi Interrupts */
93#endif
94 unsigned long bh_count; /* number of times bh was invoked */
95 unsigned long prof_counter; /* per CPU profiling support */
96 unsigned long prof_multiplier; /* per CPU profiling support */
97 unsigned long fp_rev;
98 unsigned long fp_model;
99 unsigned int state;
100 struct parisc_device *dev;
101 unsigned long loops_per_jiffy;
102};
103
104extern struct system_cpuinfo_parisc boot_cpu_data;
105extern struct cpuinfo_parisc cpu_data[NR_CPUS];
106#define current_cpu_data cpu_data[smp_processor_id()]
107
108#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
109
110typedef struct {
111 int seg;
112} mm_segment_t;
113
114#define ARCH_MIN_TASKALIGN 8
115
116struct thread_struct {
117 struct pt_regs regs;
118 unsigned long task_size;
119 unsigned long map_base;
120 unsigned long flags;
121};
122
123/* Thread struct flags. */
124#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
125
126#define INIT_THREAD { \
127 regs: { gr: { 0, }, \
128 fr: { 0, }, \
129 sr: { 0, }, \
130 iasq: { 0, }, \
131 iaoq: { 0, }, \
132 cr27: 0, \
133 }, \
134 task_size: DEFAULT_TASK_SIZE, \
135 map_base: DEFAULT_MAP_BASE, \
136 flags: 0 \
137 }
138
139/*
140 * Return saved PC of a blocked thread. This is used by ps mostly.
141 */
142
143unsigned long thread_saved_pc(struct task_struct *t);
144void show_trace(struct task_struct *task, unsigned long *stack);
145
146/*
147 * Start user thread in another space.
148 *
149 * Note that we set both the iaoq and r31 to the new pc. When
150 * the kernel initially calls execve it will return through an
151 * rfi path that will use the values in the iaoq. The execve
152 * syscall path will return through the gateway page, and
153 * that uses r31 to branch to.
154 *
155 * For ELF we clear r23, because the dynamic linker uses it to pass
156 * the address of the finalizer function.
157 *
158 * We also initialize sr3 to an illegal value (illegal for our
159 * implementation, not for the architecture).
160 */
161typedef unsigned int elf_caddr_t;
162
163#define start_thread_som(regs, new_pc, new_sp) do { \
164 unsigned long *sp = (unsigned long *)new_sp; \
165 __u32 spaceid = (__u32)current->mm->context; \
166 unsigned long pc = (unsigned long)new_pc; \
167 /* offset pc for priv. level */ \
168 pc |= 3; \
169 \
170 set_fs(USER_DS); \
171 regs->iasq[0] = spaceid; \
172 regs->iasq[1] = spaceid; \
173 regs->iaoq[0] = pc; \
174 regs->iaoq[1] = pc + 4; \
175 regs->sr[2] = LINUX_GATEWAY_SPACE; \
176 regs->sr[3] = 0xffff; \
177 regs->sr[4] = spaceid; \
178 regs->sr[5] = spaceid; \
179 regs->sr[6] = spaceid; \
180 regs->sr[7] = spaceid; \
181 regs->gr[ 0] = USER_PSW; \
182 regs->gr[30] = ((new_sp)+63)&~63; \
183 regs->gr[31] = pc; \
184 \
185 get_user(regs->gr[26],&sp[0]); \
186 get_user(regs->gr[25],&sp[-1]); \
187 get_user(regs->gr[24],&sp[-2]); \
188 get_user(regs->gr[23],&sp[-3]); \
189} while(0)
190
191/* The ELF abi wants things done a "wee bit" differently than
192 * som does. Supporting this behavior here avoids
193 * having our own version of create_elf_tables.
194 *
195 * Oh, and yes, that is not a typo, we are really passing argc in r25
196 * and argv in r24 (rather than r26 and r25). This is because that's
197 * where __libc_start_main wants them.
198 *
199 * Duplicated from dl-machine.h for the benefit of readers:
200 *
201 * Our initial stack layout is rather different from everyone else's
202 * due to the unique PA-RISC ABI. As far as I know it looks like
203 * this:
204
205 ----------------------------------- (user startup code creates this frame)
206 | 32 bytes of magic |
207 |---------------------------------|
208 | 32 bytes argument/sp save area |
209 |---------------------------------| (bprm->p)
210 | ELF auxiliary info |
211 | (up to 28 words) |
212 |---------------------------------|
213 | NULL |
214 |---------------------------------|
215 | Environment pointers |
216 |---------------------------------|
217 | NULL |
218 |---------------------------------|
219 | Argument pointers |
220 |---------------------------------| <- argv
221 | argc (1 word) |
222 |---------------------------------| <- bprm->exec (HACK!)
223 | N bytes of slack |
224 |---------------------------------|
225 | filename passed to execve |
226 |---------------------------------| (mm->env_end)
227 | env strings |
228 |---------------------------------| (mm->env_start, mm->arg_end)
229 | arg strings |
230 |---------------------------------|
231 | additional faked arg strings if |
232 | we're invoked via binfmt_script |
233 |---------------------------------| (mm->arg_start)
234 stack base is at TASK_SIZE - rlim_max.
235
236on downward growing arches, it looks like this:
237 stack base at TASK_SIZE
238 | filename passed to execve
239 | env strings
240 | arg strings
241 | faked arg strings
242 | slack
243 | ELF
244 | envps
245 | argvs
246 | argc
247
248 * The pleasant part of this is that if we need to skip arguments we
249 * can just decrement argc and move argv, because the stack pointer
250 * is utterly unrelated to the location of the environment and
251 * argument vectors.
252 *
253 * Note that the S/390 people took the easy way out and hacked their
254 * GCC to make the stack grow downwards.
255 *
256 * Final Note: For entry from syscall, the W (wide) bit of the PSW
257 * is stuffed into the lowest bit of the user sp (%r30), so we fill
258 * it in here from the current->personality
259 */
260
261#ifdef __LP64__
262#define USER_WIDE_MODE (personality(current->personality) == PER_LINUX)
263#else
264#define USER_WIDE_MODE 0
265#endif
266
267#define start_thread(regs, new_pc, new_sp) do { \
268 elf_addr_t *sp = (elf_addr_t *)new_sp; \
269 __u32 spaceid = (__u32)current->mm->context; \
270 elf_addr_t pc = (elf_addr_t)new_pc | 3; \
271 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
272 \
273 set_fs(USER_DS); \
274 regs->iasq[0] = spaceid; \
275 regs->iasq[1] = spaceid; \
276 regs->iaoq[0] = pc; \
277 regs->iaoq[1] = pc + 4; \
278 regs->sr[2] = LINUX_GATEWAY_SPACE; \
279 regs->sr[3] = 0xffff; \
280 regs->sr[4] = spaceid; \
281 regs->sr[5] = spaceid; \
282 regs->sr[6] = spaceid; \
283 regs->sr[7] = spaceid; \
284 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
285 regs->fr[ 0] = 0LL; \
286 regs->fr[ 1] = 0LL; \
287 regs->fr[ 2] = 0LL; \
288 regs->fr[ 3] = 0LL; \
289 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
290 regs->gr[31] = pc; \
291 \
292 get_user(regs->gr[25], (argv - 1)); \
293 regs->gr[24] = (long) argv; \
294 regs->gr[23] = 0; \
295} while(0)
296
297struct task_struct;
298struct mm_struct;
299
300/* Free all resources held by a thread. */
301extern void release_thread(struct task_struct *);
302extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
303
304/* Prepare to copy thread state - unlazy all lazy status */
305#define prepare_to_copy(tsk) do { } while (0)
306
307extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
308
309extern unsigned long get_wchan(struct task_struct *p);
310
311#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
312#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
313
314
315/*
316 * PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book.
317 * In addition, many implementations do hardware prefetching of both
318 * instructions and data.
319 *
320 * PA7300LC (page 14-4 of the ERS) also implements prefetching by a load
321 * to gr0 but not in a way that Linux can use. If the load would cause an
322 * interruption (eg due to prefetching 0), it is suppressed on PA2.0
323 * processors, but not on 7300LC.
324 */
325#ifdef CONFIG_PREFETCH
326#define ARCH_HAS_PREFETCH
327#define ARCH_HAS_PREFETCHW
328
329extern inline void prefetch(const void *addr)
330{
331 __asm__("ldw 0(%0), %%r0" : : "r" (addr));
332}
333
334extern inline void prefetchw(const void *addr)
335{
336 __asm__("ldd 0(%0), %%r0" : : "r" (addr));
337}
338#endif
339
340#define cpu_relax() barrier()
341
342#endif /* __ASSEMBLY__ */
343
344#endif /* __ASM_PARISC_PROCESSOR_H */