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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 (current->thread.task_size)
36#define TASK_UNMAPPED_BASE (current->thread.map_base)
37
38#define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
39#define DEFAULT_MAP_BASE32 (0x40000000UL)
40
41#ifdef CONFIG_64BIT
42#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
43#define DEFAULT_MAP_BASE (0x200000000UL)
44#else
45#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
46#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
47#endif
48
49#ifndef __ASSEMBLY__
50
51/*
52 * Data detected about CPUs at boot time which is the same for all CPU's.
53 * HP boxes are SMP - ie identical processors.
54 *
55 * FIXME: some CPU rev info may be processor specific...
56 */
57struct system_cpuinfo_parisc {
58 unsigned int cpu_count;
59 unsigned int cpu_hz;
60 unsigned int hversion;
61 unsigned int sversion;
62 enum cpu_type cpu_type;
63
64 struct {
65 struct pdc_model model;
66 unsigned long versions;
67 unsigned long cpuid;
68 unsigned long capabilities;
69 char sys_model_name[81]; /* PDC-ROM returnes this model name */
70 } pdc;
71
72 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */
73 const char *family_name; /* e.g. "1.1e" */
74};
75
76
77/* Per CPU data structure - ie varies per CPU. */
78struct cpuinfo_parisc {
79 unsigned long it_value; /* Interval Timer at last timer Intr */
80 unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */
81 unsigned long irq_count; /* number of IRQ's since boot */
82 unsigned long irq_max_cr16; /* longest time to handle a single IRQ */
83 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
84 unsigned long hpa; /* Host Physical address */
85 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
86#ifdef CONFIG_SMP
87 unsigned long pending_ipi; /* bitmap of type ipi_message_type */
88 unsigned long ipi_count; /* number ipi Interrupts */
89#endif
90 unsigned long bh_count; /* number of times bh was invoked */
91 unsigned long prof_counter; /* per CPU profiling support */
92 unsigned long prof_multiplier; /* per CPU profiling support */
93 unsigned long fp_rev;
94 unsigned long fp_model;
95 unsigned int state;
96 struct parisc_device *dev;
97 unsigned long loops_per_jiffy;
98};
99
100extern struct system_cpuinfo_parisc boot_cpu_data;
101extern struct cpuinfo_parisc cpu_data[NR_CPUS];
102#define current_cpu_data cpu_data[smp_processor_id()]
103
104#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
105
106typedef struct {
107 int seg;
108} mm_segment_t;
109
110#define ARCH_MIN_TASKALIGN 8
111
112struct thread_struct {
113 struct pt_regs regs;
114 unsigned long task_size;
115 unsigned long map_base;
116 unsigned long flags;
117};
118
119/* Thread struct flags. */
120#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
121#define PARISC_UAC_SIGBUS (1UL << 1)
122#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
123
124#define PARISC_UAC_SHIFT 0
125#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
126
127#define SET_UNALIGN_CTL(task,value) \
128 ({ \
129 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
130 | (((value) << PARISC_UAC_SHIFT) & \
131 PARISC_UAC_MASK)); \
132 0; \
133 })
134
135#define GET_UNALIGN_CTL(task,addr) \
136 ({ \
137 put_user(((task)->thread.flags & PARISC_UAC_MASK) \
138 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \
139 })
140
141#define INIT_THREAD { \
142 .regs = { .gr = { 0, }, \
143 .fr = { 0, }, \
144 .sr = { 0, }, \
145 .iasq = { 0, }, \
146 .iaoq = { 0, }, \
147 .cr27 = 0, \
148 }, \
149 .task_size = DEFAULT_TASK_SIZE, \
150 .map_base = DEFAULT_MAP_BASE, \
151 .flags = 0 \
152 }
153
154/*
155 * Return saved PC of a blocked thread. This is used by ps mostly.
156 */
157
158unsigned long thread_saved_pc(struct task_struct *t);
159void 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 */
176typedef unsigned int elf_caddr_t;
177
178#define start_thread_som(regs, new_pc, new_sp) do { \
179 unsigned long *sp = (unsigned long *)new_sp; \
180 __u32 spaceid = (__u32)current->mm->context; \
181 unsigned long pc = (unsigned long)new_pc; \
182 /* offset pc for priv. level */ \
183 pc |= 3; \
184 \
185 set_fs(USER_DS); \
186 regs->iasq[0] = spaceid; \
187 regs->iasq[1] = spaceid; \
188 regs->iaoq[0] = pc; \
189 regs->iaoq[1] = pc + 4; \
190 regs->sr[2] = LINUX_GATEWAY_SPACE; \
191 regs->sr[3] = 0xffff; \
192 regs->sr[4] = spaceid; \
193 regs->sr[5] = spaceid; \
194 regs->sr[6] = spaceid; \
195 regs->sr[7] = spaceid; \
196 regs->gr[ 0] = USER_PSW; \
197 regs->gr[30] = ((new_sp)+63)&~63; \
198 regs->gr[31] = pc; \
199 \
200 get_user(regs->gr[26],&sp[0]); \
201 get_user(regs->gr[25],&sp[-1]); \
202 get_user(regs->gr[24],&sp[-2]); \
203 get_user(regs->gr[23],&sp[-3]); \
204} while(0)
205
206/* The ELF abi wants things done a "wee bit" differently than
207 * som does. Supporting this behavior here avoids
208 * having our own version of create_elf_tables.
209 *
210 * Oh, and yes, that is not a typo, we are really passing argc in r25
211 * and argv in r24 (rather than r26 and r25). This is because that's
212 * where __libc_start_main wants them.
213 *
214 * Duplicated from dl-machine.h for the benefit of readers:
215 *
216 * Our initial stack layout is rather different from everyone else's
217 * due to the unique PA-RISC ABI. As far as I know it looks like
218 * this:
219
220 ----------------------------------- (user startup code creates this frame)
221 | 32 bytes of magic |
222 |---------------------------------|
223 | 32 bytes argument/sp save area |
224 |---------------------------------| (bprm->p)
225 | ELF auxiliary info |
226 | (up to 28 words) |
227 |---------------------------------|
228 | NULL |
229 |---------------------------------|
230 | Environment pointers |
231 |---------------------------------|
232 | NULL |
233 |---------------------------------|
234 | Argument pointers |
235 |---------------------------------| <- argv
236 | argc (1 word) |
237 |---------------------------------| <- bprm->exec (HACK!)
238 | N bytes of slack |
239 |---------------------------------|
240 | filename passed to execve |
241 |---------------------------------| (mm->env_end)
242 | env strings |
243 |---------------------------------| (mm->env_start, mm->arg_end)
244 | arg strings |
245 |---------------------------------|
246 | additional faked arg strings if |
247 | we're invoked via binfmt_script |
248 |---------------------------------| (mm->arg_start)
249 stack base is at TASK_SIZE - rlim_max.
250
251on downward growing arches, it looks like this:
252 stack base at TASK_SIZE
253 | filename passed to execve
254 | env strings
255 | arg strings
256 | faked arg strings
257 | slack
258 | ELF
259 | envps
260 | argvs
261 | argc
262
263 * The pleasant part of this is that if we need to skip arguments we
264 * can just decrement argc and move argv, because the stack pointer
265 * is utterly unrelated to the location of the environment and
266 * argument vectors.
267 *
268 * Note that the S/390 people took the easy way out and hacked their
269 * GCC to make the stack grow downwards.
270 *
271 * Final Note: For entry from syscall, the W (wide) bit of the PSW
272 * is stuffed into the lowest bit of the user sp (%r30), so we fill
273 * it in here from the current->personality
274 */
275
276#ifdef CONFIG_64BIT
277#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT))
278#else
279#define USER_WIDE_MODE 0
280#endif
281
282#define start_thread(regs, new_pc, new_sp) do { \
283 elf_addr_t *sp = (elf_addr_t *)new_sp; \
284 __u32 spaceid = (__u32)current->mm->context; \
285 elf_addr_t pc = (elf_addr_t)new_pc | 3; \
286 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
287 \
288 set_fs(USER_DS); \
289 regs->iasq[0] = spaceid; \
290 regs->iasq[1] = spaceid; \
291 regs->iaoq[0] = pc; \
292 regs->iaoq[1] = pc + 4; \
293 regs->sr[2] = LINUX_GATEWAY_SPACE; \
294 regs->sr[3] = 0xffff; \
295 regs->sr[4] = spaceid; \
296 regs->sr[5] = spaceid; \
297 regs->sr[6] = spaceid; \
298 regs->sr[7] = spaceid; \
299 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
300 regs->fr[ 0] = 0LL; \
301 regs->fr[ 1] = 0LL; \
302 regs->fr[ 2] = 0LL; \
303 regs->fr[ 3] = 0LL; \
304 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
305 regs->gr[31] = pc; \
306 \
307 get_user(regs->gr[25], (argv - 1)); \
308 regs->gr[24] = (long) argv; \
309 regs->gr[23] = 0; \
310} while(0)
311
312struct task_struct;
313struct mm_struct;
314
315/* Free all resources held by a thread. */
316extern void release_thread(struct task_struct *);
317extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
318
319/* Prepare to copy thread state - unlazy all lazy status */
320#define prepare_to_copy(tsk) do { } while (0)
321
322extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm);
323
324extern unsigned long get_wchan(struct task_struct *p);
325
326#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0])
327#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30])
328
329#define cpu_relax() barrier()
330
331/* Used as a macro to identify the combined VIPT/PIPT cached
332 * CPUs which require a guarantee of coherency (no inequivalent
333 * aliases with different data, whether clean or not) to operate */
334static inline int parisc_requires_coherency(void)
335{
336#ifdef CONFIG_PA8X00
337 return (boot_cpu_data.cpu_type == mako) ||
338 (boot_cpu_data.cpu_type == mako2);
339#else
340 return 0;
341#endif
342}
343
344#endif /* __ASSEMBLY__ */
345
346#endif /* __ASM_PARISC_PROCESSOR_H */