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 
50 unsigned long calc_max_stack_size(unsigned long stack_max);
51 
52 /*
53  * Data detected about CPUs at boot time which is the same for all CPU's.
54  * HP boxes are SMP - ie identical processors.
55  *
56  * FIXME: some CPU rev info may be processor specific...
57  */
58 struct system_cpuinfo_parisc {
59 	unsigned int	cpu_count;
60 	unsigned int	cpu_hz;
61 	unsigned int	hversion;
62 	unsigned int	sversion;
63 	enum cpu_type	cpu_type;
64 
65 	struct {
66 		struct pdc_model model;
67 		unsigned long versions;
68 		unsigned long cpuid;
69 		unsigned long capabilities;
70 		char   sys_model_name[81]; /* PDC-ROM returnes this model name */
71 	} pdc;
72 
73 	const char	*cpu_name;	/* e.g. "PA7300LC (PCX-L2)" */
74 	const char	*family_name;	/* e.g. "1.1e" */
75 };
76 
77 
78 /* Per CPU data structure - ie varies per CPU.  */
79 struct cpuinfo_parisc {
80 	unsigned long it_value;     /* Interval Timer at last timer Intr */
81 	unsigned long irq_count;    /* number of IRQ's since boot */
82 	unsigned long cpuid;        /* aka slot_number or set to NO_PROC_ID */
83 	unsigned long hpa;          /* Host Physical address */
84 	unsigned long txn_addr;     /* MMIO addr of EIR or id_eid */
85 #ifdef CONFIG_SMP
86 	unsigned long pending_ipi;  /* bitmap of type ipi_message_type */
87 #endif
88 	unsigned long bh_count;     /* number of times bh was invoked */
89 	unsigned long fp_rev;
90 	unsigned long fp_model;
91 	unsigned long cpu_num;      /* CPU number from PAT firmware */
92 	unsigned long cpu_loc;      /* CPU location from PAT firmware */
93 	unsigned int state;
94 	struct parisc_device *dev;
95 };
96 
97 extern struct system_cpuinfo_parisc boot_cpu_data;
98 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
99 extern int time_keeper_id;		/* CPU used for timekeeping */
100 
101 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
102 
103 struct thread_struct {
104 	struct pt_regs regs;
105 	unsigned long  task_size;
106 	unsigned long  map_base;
107 	unsigned long  flags;
108 };
109 
110 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
111 
112 /* Thread struct flags. */
113 #define PARISC_UAC_NOPRINT	(1UL << 0)	/* see prctl and unaligned.c */
114 #define PARISC_UAC_SIGBUS	(1UL << 1)
115 #define PARISC_KERNEL_DEATH	(1UL << 31)	/* see die_if_kernel()... */
116 
117 #define PARISC_UAC_SHIFT	0
118 #define PARISC_UAC_MASK		(PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
119 
120 #define SET_UNALIGN_CTL(task,value)                                       \
121         ({                                                                \
122         (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
123                                 | (((value) << PARISC_UAC_SHIFT) &        \
124                                    PARISC_UAC_MASK));                     \
125         0;                                                                \
126         })
127 
128 #define GET_UNALIGN_CTL(task,addr)                                        \
129         ({                                                                \
130         put_user(((task)->thread.flags & PARISC_UAC_MASK)                 \
131                  >> PARISC_UAC_SHIFT, (int __user *) (addr));             \
132         })
133 
134 #define INIT_THREAD { \
135 	.regs = {	.gr	= { 0, }, \
136 			.fr	= { 0, }, \
137 			.sr	= { 0, }, \
138 			.iasq	= { 0, }, \
139 			.iaoq	= { 0, }, \
140 			.cr27	= 0, \
141 		}, \
142 	.task_size	= DEFAULT_TASK_SIZE, \
143 	.map_base	= DEFAULT_MAP_BASE, \
144 	.flags		= 0 \
145 	}
146 
147 struct task_struct;
148 void show_trace(struct task_struct *task, unsigned long *stack);
149 
150 /*
151  * Start user thread in another space.
152  *
153  * Note that we set both the iaoq and r31 to the new pc. When
154  * the kernel initially calls execve it will return through an
155  * rfi path that will use the values in the iaoq. The execve
156  * syscall path will return through the gateway page, and
157  * that uses r31 to branch to.
158  *
159  * For ELF we clear r23, because the dynamic linker uses it to pass
160  * the address of the finalizer function.
161  *
162  * We also initialize sr3 to an illegal value (illegal for our
163  * implementation, not for the architecture).
164  */
165 typedef unsigned int elf_caddr_t;
166 
167 /* The ELF abi wants things done a "wee bit" differently than
168  * som does.  Supporting this behavior here avoids
169  * having our own version of create_elf_tables.
170  *
171  * Oh, and yes, that is not a typo, we are really passing argc in r25
172  * and argv in r24 (rather than r26 and r25).  This is because that's
173  * where __libc_start_main wants them.
174  *
175  * Duplicated from dl-machine.h for the benefit of readers:
176  *
177  *  Our initial stack layout is rather different from everyone else's
178  *  due to the unique PA-RISC ABI.  As far as I know it looks like
179  *  this:
180 
181    -----------------------------------  (user startup code creates this frame)
182    |         32 bytes of magic       |
183    |---------------------------------|
184    | 32 bytes argument/sp save area  |
185    |---------------------------------| (bprm->p)
186    |	    ELF auxiliary info	     |
187    |         (up to 28 words)        |
188    |---------------------------------|
189    |		   NULL		     |
190    |---------------------------------|
191    |	   Environment pointers	     |
192    |---------------------------------|
193    |		   NULL		     |
194    |---------------------------------|
195    |        Argument pointers        |
196    |---------------------------------| <- argv
197    |          argc (1 word)          |
198    |---------------------------------| <- bprm->exec (HACK!)
199    |         N bytes of slack        |
200    |---------------------------------|
201    |	filename passed to execve    |
202    |---------------------------------| (mm->env_end)
203    |           env strings           |
204    |---------------------------------| (mm->env_start, mm->arg_end)
205    |           arg strings           |
206    |---------------------------------|
207    | additional faked arg strings if |
208    | we're invoked via binfmt_script |
209    |---------------------------------| (mm->arg_start)
210    stack base is at TASK_SIZE - rlim_max.
211 
212 on downward growing arches, it looks like this:
213    stack base at TASK_SIZE
214    | filename passed to execve
215    | env strings
216    | arg strings
217    | faked arg strings
218    | slack
219    | ELF
220    | envps
221    | argvs
222    | argc
223 
224  *  The pleasant part of this is that if we need to skip arguments we
225  *  can just decrement argc and move argv, because the stack pointer
226  *  is utterly unrelated to the location of the environment and
227  *  argument vectors.
228  *
229  * Note that the S/390 people took the easy way out and hacked their
230  * GCC to make the stack grow downwards.
231  *
232  * Final Note: For entry from syscall, the W (wide) bit of the PSW
233  * is stuffed into the lowest bit of the user sp (%r30), so we fill
234  * it in here from the current->personality
235  */
236 
237 #define USER_WIDE_MODE	(!is_32bit_task())
238 
239 #define start_thread(regs, new_pc, new_sp) do {		\
240 	elf_addr_t *sp = (elf_addr_t *)new_sp;		\
241 	__u32 spaceid = (__u32)current->mm->context.space_id;	\
242 	elf_addr_t pc = (elf_addr_t)new_pc | 3;		\
243 	elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1;	\
244 							\
245 	regs->iasq[0] = spaceid;			\
246 	regs->iasq[1] = spaceid;			\
247 	regs->iaoq[0] = pc;				\
248 	regs->iaoq[1] = pc + 4;                         \
249 	regs->sr[2] = LINUX_GATEWAY_SPACE;              \
250 	regs->sr[3] = 0xffff;				\
251 	regs->sr[4] = spaceid;				\
252 	regs->sr[5] = spaceid;				\
253 	regs->sr[6] = spaceid;				\
254 	regs->sr[7] = spaceid;				\
255 	regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
256 	regs->fr[ 0] = 0LL;                            	\
257 	regs->fr[ 1] = 0LL;                            	\
258 	regs->fr[ 2] = 0LL;                            	\
259 	regs->fr[ 3] = 0LL;                            	\
260 	regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
261 	regs->gr[31] = pc;				\
262 							\
263 	get_user(regs->gr[25], (argv - 1));		\
264 	regs->gr[24] = (long) argv;			\
265 	regs->gr[23] = 0;				\
266 } while(0)
267 
268 struct mm_struct;
269 
270 extern unsigned long __get_wchan(struct task_struct *p);
271 
272 #define KSTK_EIP(tsk)	((tsk)->thread.regs.iaoq[0])
273 #define KSTK_ESP(tsk)	((tsk)->thread.regs.gr[30])
274 
275 #define cpu_relax()	barrier()
276 
277 /*
278  * parisc_requires_coherency() is used to identify the combined VIPT/PIPT
279  * cached CPUs which require a guarantee of coherency (no inequivalent aliases
280  * with different data, whether clean or not) to operate
281  */
282 #ifdef CONFIG_PA8X00
283 extern int _parisc_requires_coherency;
284 #define parisc_requires_coherency()	_parisc_requires_coherency
285 #else
286 #define parisc_requires_coherency()	(0)
287 #endif
288 
289 extern int running_on_qemu;
290 
291 extern void __noreturn toc_intr(struct pt_regs *regs);
292 extern void toc_handler(void);
293 extern unsigned int toc_handler_size;
294 extern unsigned int toc_handler_csum;
295 extern void do_cpu_irq_mask(struct pt_regs *);
296 extern irqreturn_t timer_interrupt(int, void *);
297 extern irqreturn_t ipi_interrupt(int, void *);
298 extern void start_cpu_itimer(void);
299 extern void handle_interruption(int, struct pt_regs *);
300 
301 /* called from assembly code: */
302 extern void start_parisc(void);
303 extern void smp_callin(unsigned long);
304 extern void sys_rt_sigreturn(struct pt_regs *, int);
305 extern void do_notify_resume(struct pt_regs *, long);
306 extern long do_syscall_trace_enter(struct pt_regs *);
307 extern void do_syscall_trace_exit(struct pt_regs *);
308 
309 /* CPU startup and info */
310 struct seq_file;
311 extern void early_trap_init(void);
312 extern void collect_boot_cpu_data(void);
313 extern int show_cpuinfo (struct seq_file *m, void *v);
314 
315 /* driver code in driver/parisc */
316 extern void gsc_init(void);
317 extern void processor_init(void);
318 extern void ccio_init(void);
319 extern void hppb_init(void);
320 extern void dino_init(void);
321 extern void iosapic_init(void);
322 extern void lba_init(void);
323 extern void sba_init(void);
324 extern void parisc_eisa_init(void);
325 struct parisc_device;
326 struct resource;
327 extern void sba_distributed_lmmio(struct parisc_device *, struct resource *);
328 extern void sba_directed_lmmio(struct parisc_device *, struct resource *);
329 extern void lba_set_iregs(struct parisc_device *lba, u32 ibase, u32 imask);
330 extern void ccio_cujo20_fixup(struct parisc_device *dev, u32 iovp);
331 
332 #endif /* __ASSEMBLY__ */
333 
334 #endif /* __ASM_PARISC_PROCESSOR_H */
335