1/* 2 * include/asm-parisc/processor.h 3 * 4 * Copyright (C) 1994 Linus Torvalds 5 * Copyright (C) 2001 Grant Grundler 6 */ 7 8#ifndef __ASM_PARISC_PROCESSOR_H 9#define __ASM_PARISC_PROCESSOR_H 10 11#ifndef __ASSEMBLY__ 12#include <linux/threads.h> 13 14#include <asm/prefetch.h> 15#include <asm/hardware.h> 16#include <asm/pdc.h> 17#include <asm/ptrace.h> 18#include <asm/types.h> 19#include <asm/percpu.h> 20#endif /* __ASSEMBLY__ */ 21 22/* 23 * Default implementation of macro that returns current 24 * instruction pointer ("program counter"). 25 */ 26#ifdef CONFIG_PA20 27#define current_ia(x) __asm__("mfia %0" : "=r"(x)) 28#else /* mfia added in pa2.0 */ 29#define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x)) 30#endif 31#define current_text_addr() ({ void *pc; current_ia(pc); pc; }) 32 33#define HAVE_ARCH_PICK_MMAP_LAYOUT 34 35#define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) 36#define TASK_SIZE TASK_SIZE_OF(current) 37#define TASK_UNMAPPED_BASE (current->thread.map_base) 38 39#define DEFAULT_TASK_SIZE32 (0xFFF00000UL) 40#define DEFAULT_MAP_BASE32 (0x40000000UL) 41 42#ifdef CONFIG_64BIT 43#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000) 44#define DEFAULT_MAP_BASE (0x200000000UL) 45#else 46#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32 47#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32 48#endif 49 50#ifdef __KERNEL__ 51 52/* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc. 53 * prumpf */ 54 55#define STACK_TOP TASK_SIZE 56#define STACK_TOP_MAX DEFAULT_TASK_SIZE 57 58/* Allow bigger stacks for 64-bit processes */ 59#define STACK_SIZE_MAX (USER_WIDE_MODE \ 60 ? (1 << 30) /* 1 GB */ \ 61 : (CONFIG_MAX_STACK_SIZE_MB*1024*1024)) 62 63#endif 64 65#ifndef __ASSEMBLY__ 66 67/* 68 * Data detected about CPUs at boot time which is the same for all CPU's. 69 * HP boxes are SMP - ie identical processors. 70 * 71 * FIXME: some CPU rev info may be processor specific... 72 */ 73struct system_cpuinfo_parisc { 74 unsigned int cpu_count; 75 unsigned int cpu_hz; 76 unsigned int hversion; 77 unsigned int sversion; 78 enum cpu_type cpu_type; 79 80 struct { 81 struct pdc_model model; 82 unsigned long versions; 83 unsigned long cpuid; 84 unsigned long capabilities; 85 char sys_model_name[81]; /* PDC-ROM returnes this model name */ 86 } pdc; 87 88 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */ 89 const char *family_name; /* e.g. "1.1e" */ 90}; 91 92 93/* Per CPU data structure - ie varies per CPU. */ 94struct cpuinfo_parisc { 95 unsigned long it_value; /* Interval Timer at last timer Intr */ 96 unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */ 97 unsigned long irq_count; /* number of IRQ's since boot */ 98 unsigned long irq_max_cr16; /* longest time to handle a single IRQ */ 99 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */ 100 unsigned long hpa; /* Host Physical address */ 101 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */ 102#ifdef CONFIG_SMP 103 unsigned long pending_ipi; /* bitmap of type ipi_message_type */ 104#endif 105 unsigned long bh_count; /* number of times bh was invoked */ 106 unsigned long prof_counter; /* per CPU profiling support */ 107 unsigned long prof_multiplier; /* per CPU profiling support */ 108 unsigned long fp_rev; 109 unsigned long fp_model; 110 unsigned int state; 111 struct parisc_device *dev; 112 unsigned long loops_per_jiffy; 113}; 114 115extern struct system_cpuinfo_parisc boot_cpu_data; 116DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data); 117 118#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) 119 120typedef struct { 121 int seg; 122} mm_segment_t; 123 124#define ARCH_MIN_TASKALIGN 8 125 126struct thread_struct { 127 struct pt_regs regs; 128 unsigned long task_size; 129 unsigned long map_base; 130 unsigned long flags; 131}; 132 133#define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs)) 134 135/* Thread struct flags. */ 136#define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */ 137#define PARISC_UAC_SIGBUS (1UL << 1) 138#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ 139 140#define PARISC_UAC_SHIFT 0 141#define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS) 142 143#define SET_UNALIGN_CTL(task,value) \ 144 ({ \ 145 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \ 146 | (((value) << PARISC_UAC_SHIFT) & \ 147 PARISC_UAC_MASK)); \ 148 0; \ 149 }) 150 151#define GET_UNALIGN_CTL(task,addr) \ 152 ({ \ 153 put_user(((task)->thread.flags & PARISC_UAC_MASK) \ 154 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \ 155 }) 156 157#define INIT_THREAD { \ 158 .regs = { .gr = { 0, }, \ 159 .fr = { 0, }, \ 160 .sr = { 0, }, \ 161 .iasq = { 0, }, \ 162 .iaoq = { 0, }, \ 163 .cr27 = 0, \ 164 }, \ 165 .task_size = DEFAULT_TASK_SIZE, \ 166 .map_base = DEFAULT_MAP_BASE, \ 167 .flags = 0 \ 168 } 169 170/* 171 * Return saved PC of a blocked thread. This is used by ps mostly. 172 */ 173 174struct task_struct; 175unsigned long thread_saved_pc(struct task_struct *t); 176void show_trace(struct task_struct *task, unsigned long *stack); 177 178/* 179 * Start user thread in another space. 180 * 181 * Note that we set both the iaoq and r31 to the new pc. When 182 * the kernel initially calls execve it will return through an 183 * rfi path that will use the values in the iaoq. The execve 184 * syscall path will return through the gateway page, and 185 * that uses r31 to branch to. 186 * 187 * For ELF we clear r23, because the dynamic linker uses it to pass 188 * the address of the finalizer function. 189 * 190 * We also initialize sr3 to an illegal value (illegal for our 191 * implementation, not for the architecture). 192 */ 193typedef unsigned int elf_caddr_t; 194 195/* The ELF abi wants things done a "wee bit" differently than 196 * som does. Supporting this behavior here avoids 197 * having our own version of create_elf_tables. 198 * 199 * Oh, and yes, that is not a typo, we are really passing argc in r25 200 * and argv in r24 (rather than r26 and r25). This is because that's 201 * where __libc_start_main wants them. 202 * 203 * Duplicated from dl-machine.h for the benefit of readers: 204 * 205 * Our initial stack layout is rather different from everyone else's 206 * due to the unique PA-RISC ABI. As far as I know it looks like 207 * this: 208 209 ----------------------------------- (user startup code creates this frame) 210 | 32 bytes of magic | 211 |---------------------------------| 212 | 32 bytes argument/sp save area | 213 |---------------------------------| (bprm->p) 214 | ELF auxiliary info | 215 | (up to 28 words) | 216 |---------------------------------| 217 | NULL | 218 |---------------------------------| 219 | Environment pointers | 220 |---------------------------------| 221 | NULL | 222 |---------------------------------| 223 | Argument pointers | 224 |---------------------------------| <- argv 225 | argc (1 word) | 226 |---------------------------------| <- bprm->exec (HACK!) 227 | N bytes of slack | 228 |---------------------------------| 229 | filename passed to execve | 230 |---------------------------------| (mm->env_end) 231 | env strings | 232 |---------------------------------| (mm->env_start, mm->arg_end) 233 | arg strings | 234 |---------------------------------| 235 | additional faked arg strings if | 236 | we're invoked via binfmt_script | 237 |---------------------------------| (mm->arg_start) 238 stack base is at TASK_SIZE - rlim_max. 239 240on downward growing arches, it looks like this: 241 stack base at TASK_SIZE 242 | filename passed to execve 243 | env strings 244 | arg strings 245 | faked arg strings 246 | slack 247 | ELF 248 | envps 249 | argvs 250 | argc 251 252 * The pleasant part of this is that if we need to skip arguments we 253 * can just decrement argc and move argv, because the stack pointer 254 * is utterly unrelated to the location of the environment and 255 * argument vectors. 256 * 257 * Note that the S/390 people took the easy way out and hacked their 258 * GCC to make the stack grow downwards. 259 * 260 * Final Note: For entry from syscall, the W (wide) bit of the PSW 261 * is stuffed into the lowest bit of the user sp (%r30), so we fill 262 * it in here from the current->personality 263 */ 264 265#ifdef CONFIG_64BIT 266#define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT)) 267#else 268#define USER_WIDE_MODE 0 269#endif 270 271#define start_thread(regs, new_pc, new_sp) do { \ 272 elf_addr_t *sp = (elf_addr_t *)new_sp; \ 273 __u32 spaceid = (__u32)current->mm->context; \ 274 elf_addr_t pc = (elf_addr_t)new_pc | 3; \ 275 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \ 276 \ 277 regs->iasq[0] = spaceid; \ 278 regs->iasq[1] = spaceid; \ 279 regs->iaoq[0] = pc; \ 280 regs->iaoq[1] = pc + 4; \ 281 regs->sr[2] = LINUX_GATEWAY_SPACE; \ 282 regs->sr[3] = 0xffff; \ 283 regs->sr[4] = spaceid; \ 284 regs->sr[5] = spaceid; \ 285 regs->sr[6] = spaceid; \ 286 regs->sr[7] = spaceid; \ 287 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \ 288 regs->fr[ 0] = 0LL; \ 289 regs->fr[ 1] = 0LL; \ 290 regs->fr[ 2] = 0LL; \ 291 regs->fr[ 3] = 0LL; \ 292 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \ 293 regs->gr[31] = pc; \ 294 \ 295 get_user(regs->gr[25], (argv - 1)); \ 296 regs->gr[24] = (long) argv; \ 297 regs->gr[23] = 0; \ 298} while(0) 299 300struct task_struct; 301struct mm_struct; 302 303/* Free all resources held by a thread. */ 304extern void release_thread(struct task_struct *); 305 306extern unsigned long get_wchan(struct task_struct *p); 307 308#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0]) 309#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30]) 310 311#define cpu_relax() barrier() 312#define cpu_relax_lowlatency() cpu_relax() 313 314/* Used as a macro to identify the combined VIPT/PIPT cached 315 * CPUs which require a guarantee of coherency (no inequivalent 316 * aliases with different data, whether clean or not) to operate */ 317static inline int parisc_requires_coherency(void) 318{ 319#ifdef CONFIG_PA8X00 320 return (boot_cpu_data.cpu_type == mako) || 321 (boot_cpu_data.cpu_type == mako2); 322#else 323 return 0; 324#endif 325} 326 327#endif /* __ASSEMBLY__ */ 328 329#endif /* __ASM_PARISC_PROCESSOR_H */ 330