LXR linux/arch/parisc/include/asm/processor.h

   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 */
 301