Linux kernel mirror (for testing)
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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 __ASSEMBLY__
13#include <linux/threads.h>
14
15#include <asm/assembly.h>
16#include <asm/prefetch.h>
17#include <asm/hardware.h>
18#include <asm/pdc.h>
19#include <asm/ptrace.h>
20#include <asm/types.h>
21#include <asm/percpu.h>
22#endif /* __ASSEMBLY__ */
23
24#define HAVE_ARCH_PICK_MMAP_LAYOUT
25
26#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size)
27#define TASK_SIZE TASK_SIZE_OF(current)
28#define TASK_UNMAPPED_BASE (current->thread.map_base)
29
30#define DEFAULT_TASK_SIZE32 (0xFFF00000UL)
31#define DEFAULT_MAP_BASE32 (0x40000000UL)
32
33#ifdef CONFIG_64BIT
34#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000)
35#define DEFAULT_MAP_BASE (0x200000000UL)
36#else
37#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32
38#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32
39#endif
40
41/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc.
42 * prumpf */
43
44#define STACK_TOP TASK_SIZE
45#define STACK_TOP_MAX DEFAULT_TASK_SIZE
46
47#ifndef __ASSEMBLY__
48
49unsigned long calc_max_stack_size(unsigned long stack_max);
50
51/*
52 * Data detected about CPUs at boot time which is the same for all CPU's.
53 * HP boxes are SMP - ie identical processors.
54 *
55 * FIXME: some CPU rev info may be processor specific...
56 */
57struct system_cpuinfo_parisc {
58 unsigned int cpu_count;
59 unsigned int cpu_hz;
60 unsigned int hversion;
61 unsigned int sversion;
62 enum cpu_type cpu_type;
63
64 struct {
65 struct pdc_model model;
66 unsigned long versions;
67 unsigned long cpuid;
68 unsigned long capabilities;
69 char sys_model_name[81]; /* PDC-ROM returnes this model name */
70 } pdc;
71
72 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */
73 const char *family_name; /* e.g. "1.1e" */
74};
75
76
77/* Per CPU data structure - ie varies per CPU. */
78struct cpuinfo_parisc {
79 unsigned long it_value; /* Interval Timer at last timer Intr */
80 unsigned long irq_count; /* number of IRQ's since boot */
81 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */
82 unsigned long hpa; /* Host Physical address */
83 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
84#ifdef CONFIG_SMP
85 unsigned long pending_ipi; /* bitmap of type ipi_message_type */
86#endif
87 unsigned long bh_count; /* number of times bh was invoked */
88 unsigned long fp_rev;
89 unsigned long fp_model;
90 unsigned long cpu_num; /* CPU number from PAT firmware */
91 unsigned long cpu_loc; /* CPU location from PAT firmware */
92 unsigned int state;
93 struct parisc_device *dev;
94};
95
96extern struct system_cpuinfo_parisc boot_cpu_data;
97DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data);
98extern int time_keeper_id; /* CPU used for timekeeping */
99
100#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF)
101
102struct thread_struct {
103 struct pt_regs regs;
104 unsigned long task_size;
105 unsigned long map_base;
106 unsigned long flags;
107};
108
109#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs))
110
111/* Thread struct flags. */
112#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */
113#define PARISC_UAC_SIGBUS (1UL << 1)
114#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */
115
116#define PARISC_UAC_SHIFT 0
117#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS)
118
119#define SET_UNALIGN_CTL(task,value) \
120 ({ \
121 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \
122 | (((value) << PARISC_UAC_SHIFT) & \
123 PARISC_UAC_MASK)); \
124 0; \
125 })
126
127#define GET_UNALIGN_CTL(task,addr) \
128 ({ \
129 put_user(((task)->thread.flags & PARISC_UAC_MASK) \
130 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \
131 })
132
133#define INIT_THREAD { \
134 .regs = { .gr = { 0, }, \
135 .fr = { 0, }, \
136 .sr = { 0, }, \
137 .iasq = { 0, }, \
138 .iaoq = { 0, }, \
139 .cr27 = 0, \
140 }, \
141 .task_size = DEFAULT_TASK_SIZE, \
142 .map_base = DEFAULT_MAP_BASE, \
143 .flags = 0 \
144 }
145
146struct task_struct;
147void show_trace(struct task_struct *task, unsigned long *stack);
148
149/*
150 * Start user thread in another space.
151 *
152 * Note that we set both the iaoq and r31 to the new pc. When
153 * the kernel initially calls execve it will return through an
154 * rfi path that will use the values in the iaoq. The execve
155 * syscall path will return through the gateway page, and
156 * that uses r31 to branch to.
157 *
158 * For ELF we clear r23, because the dynamic linker uses it to pass
159 * the address of the finalizer function.
160 *
161 * We also initialize sr3 to an illegal value (illegal for our
162 * implementation, not for the architecture).
163 */
164typedef unsigned int elf_caddr_t;
165
166/* The ELF abi wants things done a "wee bit" differently than
167 * som does. Supporting this behavior here avoids
168 * having our own version of create_elf_tables.
169 *
170 * Oh, and yes, that is not a typo, we are really passing argc in r25
171 * and argv in r24 (rather than r26 and r25). This is because that's
172 * where __libc_start_main wants them.
173 *
174 * Duplicated from dl-machine.h for the benefit of readers:
175 *
176 * Our initial stack layout is rather different from everyone else's
177 * due to the unique PA-RISC ABI. As far as I know it looks like
178 * this:
179
180 ----------------------------------- (user startup code creates this frame)
181 | 32 bytes of magic |
182 |---------------------------------|
183 | 32 bytes argument/sp save area |
184 |---------------------------------| (bprm->p)
185 | ELF auxiliary info |
186 | (up to 28 words) |
187 |---------------------------------|
188 | NULL |
189 |---------------------------------|
190 | Environment pointers |
191 |---------------------------------|
192 | NULL |
193 |---------------------------------|
194 | Argument pointers |
195 |---------------------------------| <- argv
196 | argc (1 word) |
197 |---------------------------------| <- bprm->exec (HACK!)
198 | N bytes of slack |
199 |---------------------------------|
200 | filename passed to execve |
201 |---------------------------------| (mm->env_end)
202 | env strings |
203 |---------------------------------| (mm->env_start, mm->arg_end)
204 | arg strings |
205 |---------------------------------|
206 | additional faked arg strings if |
207 | we're invoked via binfmt_script |
208 |---------------------------------| (mm->arg_start)
209 stack base is at TASK_SIZE - rlim_max.
210
211on downward growing arches, it looks like this:
212 stack base at TASK_SIZE
213 | filename passed to execve
214 | env strings
215 | arg strings
216 | faked arg strings
217 | slack
218 | ELF
219 | envps
220 | argvs
221 | argc
222
223 * The pleasant part of this is that if we need to skip arguments we
224 * can just decrement argc and move argv, because the stack pointer
225 * is utterly unrelated to the location of the environment and
226 * argument vectors.
227 *
228 * Note that the S/390 people took the easy way out and hacked their
229 * GCC to make the stack grow downwards.
230 *
231 * Final Note: For entry from syscall, the W (wide) bit of the PSW
232 * is stuffed into the lowest bit of the user sp (%r30), so we fill
233 * it in here from the current->personality
234 */
235
236#define USER_WIDE_MODE (!is_32bit_task())
237
238#define start_thread(regs, new_pc, new_sp) do { \
239 elf_addr_t *sp = (elf_addr_t *)new_sp; \
240 __u32 spaceid = (__u32)current->mm->context.space_id; \
241 elf_addr_t pc = (elf_addr_t)new_pc | 3; \
242 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \
243 \
244 regs->iasq[0] = spaceid; \
245 regs->iasq[1] = spaceid; \
246 regs->iaoq[0] = pc; \
247 regs->iaoq[1] = pc + 4; \
248 regs->sr[2] = LINUX_GATEWAY_SPACE; \
249 regs->sr[3] = 0xffff; \
250 regs->sr[4] = spaceid; \
251 regs->sr[5] = spaceid; \
252 regs->sr[6] = spaceid; \
253 regs->sr[7] = spaceid; \
254 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \
255 regs->fr[ 0] = 0LL; \
256 regs->fr[ 1] = 0LL; \
257 regs->fr[ 2] = 0LL; \
258 regs->fr[ 3] = 0LL; \
259 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \
260 regs->gr[31] = pc; \
261 \
262 get_user(regs->gr[25], (argv - 1)); \
263 regs->gr[24] = (long) argv; \
264 regs->gr[23] = 0; \
265} while(0)
266
267struct mm_struct;
268
269/* Free all resources held by a thread. */
270extern void release_thread(struct task_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;
292
293extern void __noreturn toc_intr(struct pt_regs *regs);
294extern void toc_handler(void);
295extern unsigned int toc_handler_size;
296extern unsigned int toc_handler_csum;
297
298#endif /* __ASSEMBLY__ */
299
300#endif /* __ASM_PARISC_PROCESSOR_H */