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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 __ASSEMBLER__
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 /* __ASSEMBLER__ */
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 __ASSEMBLER__
49
50struct rlimit;
51unsigned long mmap_upper_limit(const 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 parisc_clockevent_init(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 /* __ASSEMBLER__ */
329
330#endif /* __ASM_PARISC_PROCESSOR_H */