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 #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 extern int parisc_narrow_firmware;
 291
 292 extern void __noreturn toc_intr(struct pt_regs *regs);
 293 extern void toc_handler(void);
 294 extern unsigned int toc_handler_size;
 295 extern unsigned int toc_handler_csum;
 296 extern void do_cpu_irq_mask(struct pt_regs *);
 297 extern irqreturn_t timer_interrupt(int, void *);
 298 extern irqreturn_t ipi_interrupt(int, void *);
 299 extern void start_cpu_itimer(void);
 300 extern void handle_interruption(int, struct pt_regs *);
 301
 302 /* called from assembly code: */
 303 extern void start_parisc(void);
 304 extern void smp_callin(unsigned long);
 305 extern void sys_rt_sigreturn(struct pt_regs *, int);
 306 extern void do_notify_resume(struct pt_regs *, long);
 307 extern long do_syscall_trace_enter(struct pt_regs *);
 308 extern void do_syscall_trace_exit(struct pt_regs *);
 309
 310 /* CPU startup and info */
 311 struct seq_file;
 312 extern void early_trap_init(void);
 313 extern void collect_boot_cpu_data(void);
 314 extern void btlb_init_per_cpu(void);
 315 extern int show_cpuinfo (struct seq_file *m, void *v);
 316
 317 /* driver code in driver/parisc */
 318 extern void processor_init(void);
 319 struct parisc_device;
 320 struct resource;
 321 extern void sba_distributed_lmmio(struct parisc_device *, struct resource *);
 322 extern void sba_directed_lmmio(struct parisc_device *, struct resource *);
 323 extern void lba_set_iregs(struct parisc_device *lba, u32 ibase, u32 imask);
 324 extern void ccio_cujo20_fixup(struct parisc_device *dev, u32 iovp);
 325
 326 #endif /* __ASSEMBLY__ */
 327
 328 #endif /* __ASM_PARISC_PROCESSOR_H */