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#include <linux/irqreturn.h>
15
16#include <asm/assembly.h>
17#include <asm/prefetch.h>
18#include <asm/hardware.h>
19#include <asm/pdc.h>
20#include <asm/ptrace.h>
21#include <asm/types.h>
22#include <asm/percpu.h>
23#endif /* __ASSEMBLY__ */
24
25#define HAVE_ARCH_PICK_MMAP_LAYOUT
26
27#define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
28#define TASK_SIZE	        TASK_SIZE_OF(current)
29#define TASK_UNMAPPED_BASE      (current->thread.map_base)
30
31#define DEFAULT_TASK_SIZE32	(0xFFF00000UL)
32#define DEFAULT_MAP_BASE32	(0x40000000UL)
33
34#ifdef CONFIG_64BIT
35#define DEFAULT_TASK_SIZE       (MAX_ADDRESS-0xf000000)
36#define DEFAULT_MAP_BASE        (0x200000000UL)
37#else
38#define DEFAULT_TASK_SIZE	DEFAULT_TASK_SIZE32
39#define DEFAULT_MAP_BASE	DEFAULT_MAP_BASE32
40#endif
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#ifndef __ASSEMBLY__
49
50struct rlimit;
51unsigned long mmap_upper_limit(struct rlimit *rlim_stack);
52unsigned long calc_max_stack_size(unsigned long stack_max);
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	const char	*cpu_name;	/* e.g. "PA7300LC (PCX-L2)" */
76	const 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 irq_count;    /* number of IRQ's since boot */
84	unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
85	unsigned long hpa;          /* Host Physical address */
86	unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
87#ifdef CONFIG_SMP
88	unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
89#endif
90	unsigned long bh_count;     /* number of times bh was invoked */
91	unsigned long fp_rev;
92	unsigned long fp_model;
93	unsigned long cpu_num;      /* CPU number from PAT firmware */
94	unsigned long cpu_loc;      /* CPU location from PAT firmware */
95	unsigned int state;
96	struct parisc_device *dev;
97};
98
99extern struct system_cpuinfo_parisc boot_cpu_data;
100DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
101extern int time_keeper_id;		/* CPU used for timekeeping */
102
103#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
104
105struct thread_struct {
106	struct pt_regs regs;
107	unsigned long  task_size;
108	unsigned long  map_base;
109	unsigned long  flags;
110};
111
112#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
113
114/* Thread struct flags. */
115#define PARISC_UAC_NOPRINT	(1UL << 0)	/* see prctl and unaligned.c */
116#define PARISC_UAC_SIGBUS	(1UL << 1)
117#define PARISC_KERNEL_DEATH	(1UL << 31)	/* see die_if_kernel()... */
118
119#define PARISC_UAC_SHIFT	0
120#define PARISC_UAC_MASK		(PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
121
122#define SET_UNALIGN_CTL(task,value)                                       \
123        ({                                                                \
124        (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
125                                | (((value) << PARISC_UAC_SHIFT) &        \
126                                   PARISC_UAC_MASK));                     \
127        0;                                                                \
128        })
129
130#define GET_UNALIGN_CTL(task,addr)                                        \
131        ({                                                                \
132        put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
133                 >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
134        })
135
136#define INIT_THREAD { \
137	.regs = {	.gr	= { 0, }, \
138			.fr	= { 0, }, \
139			.sr	= { 0, }, \
140			.iasq	= { 0, }, \
141			.iaoq	= { 0, }, \
142			.cr27	= 0, \
143		}, \
144	.task_size	= DEFAULT_TASK_SIZE, \
145	.map_base	= DEFAULT_MAP_BASE, \
146	.flags		= 0 \
147	}
148
149struct task_struct;
150void show_trace(struct task_struct *task, unsigned long *stack);
151
152/*
153 * Start user thread in another space.
154 *
155 * Note that we set both the iaoq and r31 to the new pc. When
156 * the kernel initially calls execve it will return through an
157 * rfi path that will use the values in the iaoq. The execve
158 * syscall path will return through the gateway page, and
159 * that uses r31 to branch to.
160 *
161 * For ELF we clear r23, because the dynamic linker uses it to pass
162 * the address of the finalizer function.
163 *
164 * We also initialize sr3 to an illegal value (illegal for our
165 * implementation, not for the architecture).
166 */
167typedef unsigned int elf_caddr_t;
168
169/* The ELF abi wants things done a "wee bit" differently than
170 * som does.  Supporting this behavior here avoids
171 * having our own version of create_elf_tables.
172 *
173 * Oh, and yes, that is not a typo, we are really passing argc in r25
174 * and argv in r24 (rather than r26 and r25).  This is because that's
175 * where __libc_start_main wants them.
176 *
177 * Duplicated from dl-machine.h for the benefit of readers:
178 *
179 *  Our initial stack layout is rather different from everyone else's
180 *  due to the unique PA-RISC ABI.  As far as I know it looks like
181 *  this:
182
183   -----------------------------------  (user startup code creates this frame)
184   |         32 bytes of magic       |
185   |---------------------------------|
186   | 32 bytes argument/sp save area  |
187   |---------------------------------| (bprm->p)
188   |	    ELF auxiliary info	     |
189   |         (up to 28 words)        |
190   |---------------------------------|
191   |		   NULL		     |
192   |---------------------------------|
193   |	   Environment pointers	     |
194   |---------------------------------|
195   |		   NULL		     |
196   |---------------------------------|
197   |        Argument pointers        |
198   |---------------------------------| <- argv
199   |          argc (1 word)          |
200   |---------------------------------| <- bprm->exec (HACK!)
201   |         N bytes of slack        |
202   |---------------------------------|
203   |	filename passed to execve    |
204   |---------------------------------| (mm->env_end)
205   |           env strings           |
206   |---------------------------------| (mm->env_start, mm->arg_end)
207   |           arg strings           |
208   |---------------------------------|
209   | additional faked arg strings if |
210   | we're invoked via binfmt_script |
211   |---------------------------------| (mm->arg_start)
212   stack base is at TASK_SIZE - rlim_max.
213
214on downward growing arches, it looks like this:
215   stack base at TASK_SIZE
216   | filename passed to execve
217   | env strings
218   | arg strings
219   | faked arg strings
220   | slack
221   | ELF
222   | envps
223   | argvs
224   | argc
225
226 *  The pleasant part of this is that if we need to skip arguments we
227 *  can just decrement argc and move argv, because the stack pointer
228 *  is utterly unrelated to the location of the environment and
229 *  argument vectors.
230 *
231 * Note that the S/390 people took the easy way out and hacked their
232 * GCC to make the stack grow downwards.
233 *
234 * Final Note: For entry from syscall, the W (wide) bit of the PSW
235 * is stuffed into the lowest bit of the user sp (%r30), so we fill
236 * it in here from the current->personality
237 */
238
239#define USER_WIDE_MODE	(!is_32bit_task())
240
241#define start_thread(regs, new_pc, new_sp) do {		\
242	elf_addr_t *sp = (elf_addr_t *)new_sp;		\
243	__u32 spaceid = (__u32)current->mm->context.space_id;	\
244	elf_addr_t pc = (elf_addr_t)new_pc | 3;		\
245	elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;	\
246							\
247	regs->iasq[0] = spaceid;			\
248	regs->iasq[1] = spaceid;			\
249	regs->iaoq[0] = pc;				\
250	regs->iaoq[1] = pc + 4;                         \
251	regs->sr[2] = LINUX_GATEWAY_SPACE;              \
252	regs->sr[3] = 0xffff;				\
253	regs->sr[4] = spaceid;				\
254	regs->sr[5] = spaceid;				\
255	regs->sr[6] = spaceid;				\
256	regs->sr[7] = spaceid;				\
257	regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
258	regs->fr[ 0] = 0LL;                            	\
259	regs->fr[ 1] = 0LL;                            	\
260	regs->fr[ 2] = 0LL;                            	\
261	regs->fr[ 3] = 0LL;                            	\
262	regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
263	regs->gr[31] = pc;				\
264							\
265	get_user(regs->gr[25], (argv - 1));		\
266	regs->gr[24] = (long) argv;			\
267	regs->gr[23] = 0;				\
268} while(0)
269
270struct mm_struct;
271
272extern unsigned long __get_wchan(struct task_struct *p);
273
274#define KSTK_EIP(tsk)	((tsk)->thread.regs.iaoq[0])
275#define KSTK_ESP(tsk)	((tsk)->thread.regs.gr[30])
276
277#define cpu_relax()	barrier()
278
279/*
280 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
281 * cached CPUs which require a guarantee of coherency (no inequivalent aliases
282 * with different data, whether clean or not) to operate
283 */
284#ifdef CONFIG_PA8X00
285extern int _parisc_requires_coherency;
286#define parisc_requires_coherency()	_parisc_requires_coherency
287#else
288#define parisc_requires_coherency()	(0)
289#endif
290
291extern int running_on_qemu;
292extern int parisc_narrow_firmware;
293
294extern void __noreturn toc_intr(struct pt_regs *regs);
295extern void toc_handler(void);
296extern unsigned int toc_handler_size;
297extern unsigned int toc_handler_csum;
298extern void do_cpu_irq_mask(struct pt_regs *);
299extern irqreturn_t timer_interrupt(int, void *);
300extern irqreturn_t ipi_interrupt(int, void *);
301extern void start_cpu_itimer(void);
302extern void handle_interruption(int, struct pt_regs *);
303
304/* called from assembly code: */
305extern void start_parisc(void);
306extern void smp_callin(unsigned long);
307extern void sys_rt_sigreturn(struct pt_regs *, int);
308extern void do_notify_resume(struct pt_regs *, long);
309extern long do_syscall_trace_enter(struct pt_regs *);
310extern void do_syscall_trace_exit(struct pt_regs *);
311
312/* CPU startup and info */
313struct seq_file;
314extern void early_trap_init(void);
315extern void collect_boot_cpu_data(void);
316extern void btlb_init_per_cpu(void);
317extern int show_cpuinfo (struct seq_file *m, void *v);
318
319/* driver code in driver/parisc */
320extern void processor_init(void);
321struct parisc_device;
322struct resource;
323extern void sba_distributed_lmmio(struct parisc_device *, struct resource *);
324extern void sba_directed_lmmio(struct parisc_device *, struct resource *);
325extern void lba_set_iregs(struct parisc_device *lba, u32 ibase, u32 imask);
326extern void ccio_cujo20_fixup(struct parisc_device *dev, u32 iovp);
327
328#endif /* __ASSEMBLY__ */
329
330#endif /* __ASM_PARISC_PROCESSOR_H */
331