1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * include/asm-parisc/processor.h
4 *
5 * Copyright (C) 1994 Linus Torvalds
6 * Copyright (C) 2001 Grant Grundler
7 */
8
9#ifndef __ASM_PARISC_PROCESSOR_H
10#define __ASM_PARISC_PROCESSOR_H
11
12#ifndef __ASSEMBLY__
13#include <linux/threads.h>
14
15#include <asm/prefetch.h>
16#include <asm/hardware.h>
17#include <asm/pdc.h>
18#include <asm/ptrace.h>
19#include <asm/types.h>
20#include <asm/percpu.h>
21#endif /* __ASSEMBLY__ */
22
23#define HAVE_ARCH_PICK_MMAP_LAYOUT
24
25#define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
26#define TASK_SIZE	        TASK_SIZE_OF(current)
27#define TASK_UNMAPPED_BASE      (current->thread.map_base)
28
29#define DEFAULT_TASK_SIZE32	(0xFFF00000UL)
30#define DEFAULT_MAP_BASE32	(0x40000000UL)
31
32#ifdef CONFIG_64BIT
33#define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
34#define DEFAULT_MAP_BASE        (0x200000000UL)
35#else
36#define DEFAULT_TASK_SIZE	DEFAULT_TASK_SIZE32
37#define DEFAULT_MAP_BASE	DEFAULT_MAP_BASE32
38#endif
39
40#ifdef __KERNEL__
41
42/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
43 * prumpf */
44
45#define STACK_TOP	TASK_SIZE
46#define STACK_TOP_MAX	DEFAULT_TASK_SIZE
47
48/* Allow bigger stacks for 64-bit processes */
49#define STACK_SIZE_MAX	(USER_WIDE_MODE					\
50			 ? (1 << 30)	/* 1 GB */			\
51			 : (CONFIG_MAX_STACK_SIZE_MB*1024*1024))
52
53#endif
54
55#ifndef __ASSEMBLY__
56
57/*
58 * Data detected about CPUs at boot time which is the same for all CPU's.
59 * HP boxes are SMP - ie identical processors.
60 *
61 * FIXME: some CPU rev info may be processor specific...
62 */
63struct system_cpuinfo_parisc {
64	unsigned int	cpu_count;
65	unsigned int	cpu_hz;
66	unsigned int	hversion;
67	unsigned int	sversion;
68	enum cpu_type	cpu_type;
69
70	struct {
71		struct pdc_model model;
72		unsigned long versions;
73		unsigned long cpuid;
74		unsigned long capabilities;
75		char   sys_model_name[81]; /* PDC-ROM returnes this model name */
76	} pdc;
77
78	const char	*cpu_name;	/* e.g. "PA7300LC (PCX-L2)" */
79	const char	*family_name;	/* e.g. "1.1e" */
80};
81
82
83/* Per CPU data structure - ie varies per CPU.  */
84struct cpuinfo_parisc {
85	unsigned long it_value;     /* Interval Timer at last timer Intr */
86	unsigned long irq_count;    /* number of IRQ's since boot */
87	unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
88	unsigned long hpa;          /* Host Physical address */
89	unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
90#ifdef CONFIG_SMP
91	unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
92#endif
93	unsigned long bh_count;     /* number of times bh was invoked */
94	unsigned long fp_rev;
95	unsigned long fp_model;
96	unsigned long cpu_num;      /* CPU number from PAT firmware */
97	unsigned long cpu_loc;      /* CPU location from PAT firmware */
98	unsigned int state;
99	struct parisc_device *dev;
100};
101
102extern struct system_cpuinfo_parisc boot_cpu_data;
103DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
104
105#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
106
107typedef struct {
108	int seg;
109} mm_segment_t;
110
111#define ARCH_MIN_TASKALIGN	8
112
113struct thread_struct {
114	struct pt_regs regs;
115	unsigned long  task_size;
116	unsigned long  map_base;
117	unsigned long  flags;
118};
119
120#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
121
122/* Thread struct flags. */
123#define PARISC_UAC_NOPRINT	(1UL << 0)	/* see prctl and unaligned.c */
124#define PARISC_UAC_SIGBUS	(1UL << 1)
125#define PARISC_KERNEL_DEATH	(1UL << 31)	/* see die_if_kernel()... */
126
127#define PARISC_UAC_SHIFT	0
128#define PARISC_UAC_MASK		(PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
129
130#define SET_UNALIGN_CTL(task,value)                                       \
131        ({                                                                \
132        (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
133                                | (((value) << PARISC_UAC_SHIFT) &        \
134                                   PARISC_UAC_MASK));                     \
135        0;                                                                \
136        })
137
138#define GET_UNALIGN_CTL(task,addr)                                        \
139        ({                                                                \
140        put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
141                 >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
142        })
143
144#define INIT_THREAD { \
145	.regs = {	.gr	= { 0, }, \
146			.fr	= { 0, }, \
147			.sr	= { 0, }, \
148			.iasq	= { 0, }, \
149			.iaoq	= { 0, }, \
150			.cr27	= 0, \
151		}, \
152	.task_size	= DEFAULT_TASK_SIZE, \
153	.map_base	= DEFAULT_MAP_BASE, \
154	.flags		= 0 \
155	}
156
157struct task_struct;
158void show_trace(struct task_struct *task, unsigned long *stack);
159
160/*
161 * Start user thread in another space.
162 *
163 * Note that we set both the iaoq and r31 to the new pc. When
164 * the kernel initially calls execve it will return through an
165 * rfi path that will use the values in the iaoq. The execve
166 * syscall path will return through the gateway page, and
167 * that uses r31 to branch to.
168 *
169 * For ELF we clear r23, because the dynamic linker uses it to pass
170 * the address of the finalizer function.
171 *
172 * We also initialize sr3 to an illegal value (illegal for our
173 * implementation, not for the architecture).
174 */
175typedef unsigned int elf_caddr_t;
176
177/* The ELF abi wants things done a "wee bit" differently than
178 * som does.  Supporting this behavior here avoids
179 * having our own version of create_elf_tables.
180 *
181 * Oh, and yes, that is not a typo, we are really passing argc in r25
182 * and argv in r24 (rather than r26 and r25).  This is because that's
183 * where __libc_start_main wants them.
184 *
185 * Duplicated from dl-machine.h for the benefit of readers:
186 *
187 *  Our initial stack layout is rather different from everyone else's
188 *  due to the unique PA-RISC ABI.  As far as I know it looks like
189 *  this:
190
191   -----------------------------------  (user startup code creates this frame)
192   |         32 bytes of magic       |
193   |---------------------------------|
194   | 32 bytes argument/sp save area  |
195   |---------------------------------| (bprm->p)
196   |	    ELF auxiliary info	     |
197   |         (up to 28 words)        |
198   |---------------------------------|
199   |		   NULL		     |
200   |---------------------------------|
201   |	   Environment pointers	     |
202   |---------------------------------|
203   |		   NULL		     |
204   |---------------------------------|
205   |        Argument pointers        |
206   |---------------------------------| <- argv
207   |          argc (1 word)          |
208   |---------------------------------| <- bprm->exec (HACK!)
209   |         N bytes of slack        |
210   |---------------------------------|
211   |	filename passed to execve    |
212   |---------------------------------| (mm->env_end)
213   |           env strings           |
214   |---------------------------------| (mm->env_start, mm->arg_end)
215   |           arg strings           |
216   |---------------------------------|
217   | additional faked arg strings if |
218   | we're invoked via binfmt_script |
219   |---------------------------------| (mm->arg_start)
220   stack base is at TASK_SIZE - rlim_max.
221
222on downward growing arches, it looks like this:
223   stack base at TASK_SIZE
224   | filename passed to execve
225   | env strings
226   | arg strings
227   | faked arg strings
228   | slack
229   | ELF
230   | envps
231   | argvs
232   | argc
233
234 *  The pleasant part of this is that if we need to skip arguments we
235 *  can just decrement argc and move argv, because the stack pointer
236 *  is utterly unrelated to the location of the environment and
237 *  argument vectors.
238 *
239 * Note that the S/390 people took the easy way out and hacked their
240 * GCC to make the stack grow downwards.
241 *
242 * Final Note: For entry from syscall, the W (wide) bit of the PSW
243 * is stuffed into the lowest bit of the user sp (%r30), so we fill
244 * it in here from the current->personality
245 */
246
247#define USER_WIDE_MODE	(!is_32bit_task())
248
249#define start_thread(regs, new_pc, new_sp) do {		\
250	elf_addr_t *sp = (elf_addr_t *)new_sp;		\
251	__u32 spaceid = (__u32)current->mm->context;	\
252	elf_addr_t pc = (elf_addr_t)new_pc | 3;		\
253	elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;	\
254							\
255	regs->iasq[0] = spaceid;			\
256	regs->iasq[1] = spaceid;			\
257	regs->iaoq[0] = pc;				\
258	regs->iaoq[1] = pc + 4;                         \
259	regs->sr[2] = LINUX_GATEWAY_SPACE;              \
260	regs->sr[3] = 0xffff;				\
261	regs->sr[4] = spaceid;				\
262	regs->sr[5] = spaceid;				\
263	regs->sr[6] = spaceid;				\
264	regs->sr[7] = spaceid;				\
265	regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
266	regs->fr[ 0] = 0LL;                            	\
267	regs->fr[ 1] = 0LL;                            	\
268	regs->fr[ 2] = 0LL;                            	\
269	regs->fr[ 3] = 0LL;                            	\
270	regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
271	regs->gr[31] = pc;				\
272							\
273	get_user(regs->gr[25], (argv - 1));		\
274	regs->gr[24] = (long) argv;			\
275	regs->gr[23] = 0;				\
276} while(0)
277
278struct task_struct;
279struct mm_struct;
280
281/* Free all resources held by a thread. */
282extern void release_thread(struct task_struct *);
283
284extern unsigned long get_wchan(struct task_struct *p);
285
286#define KSTK_EIP(tsk)	((tsk)->thread.regs.iaoq[0])
287#define KSTK_ESP(tsk)	((tsk)->thread.regs.gr[30])
288
289#define cpu_relax()	barrier()
290
291/*
292 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
293 * cached CPUs which require a guarantee of coherency (no inequivalent aliases
294 * with different data, whether clean or not) to operate
295 */
296#ifdef CONFIG_PA8X00
297extern int _parisc_requires_coherency;
298#define parisc_requires_coherency()	_parisc_requires_coherency
299#else
300#define parisc_requires_coherency()	(0)
301#endif
302
303extern int running_on_qemu;
304
305#endif /* __ASSEMBLY__ */
306
307#endif /* __ASM_PARISC_PROCESSOR_H */
308