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 */
73struct 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.  */
94struct 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
115extern struct system_cpuinfo_parisc boot_cpu_data;
116DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
117
118#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
119
120typedef struct {
121	int seg;
122} mm_segment_t;
123
124#define ARCH_MIN_TASKALIGN	8
125
126struct 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
174struct task_struct;
175unsigned long thread_saved_pc(struct task_struct *t);
176void 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 */
193typedef 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
240on 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
300struct task_struct;
301struct mm_struct;
302
303/* Free all resources held by a thread. */
304extern void release_thread(struct task_struct *);
305
306extern 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 */
317static 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