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 */ 73 struct 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. */ 94 struct cpuinfo_parisc { 95 unsigned long it_value; /* Interval Timer at last timer Intr */ 96 unsigned long irq_count; /* number of IRQ's since boot */ 97 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */ 98 unsigned long hpa; /* Host Physical address */ 99 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */ 100 #ifdef CONFIG_SMP 101 unsigned long pending_ipi; /* bitmap of type ipi_message_type */ 102 #endif 103 unsigned long bh_count; /* number of times bh was invoked */ 104 unsigned long fp_rev; 105 unsigned long fp_model; 106 unsigned int state; 107 struct parisc_device *dev; 108 unsigned long loops_per_jiffy; 109 }; 110 111 extern struct system_cpuinfo_parisc boot_cpu_data; 112 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data); 113 114 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) 115 116 typedef struct { 117 int seg; 118 } mm_segment_t; 119 120 #define ARCH_MIN_TASKALIGN 8 121 122 struct thread_struct { 123 struct pt_regs regs; 124 unsigned long task_size; 125 unsigned long map_base; 126 unsigned long flags; 127 }; 128 129 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs)) 130 131 /* Thread struct flags. */ 132 #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */ 133 #define PARISC_UAC_SIGBUS (1UL << 1) 134 #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ 135 136 #define PARISC_UAC_SHIFT 0 137 #define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS) 138 139 #define SET_UNALIGN_CTL(task,value) \ 140 ({ \ 141 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \ 142 | (((value) << PARISC_UAC_SHIFT) & \ 143 PARISC_UAC_MASK)); \ 144 0; \ 145 }) 146 147 #define GET_UNALIGN_CTL(task,addr) \ 148 ({ \ 149 put_user(((task)->thread.flags & PARISC_UAC_MASK) \ 150 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \ 151 }) 152 153 #define INIT_THREAD { \ 154 .regs = { .gr = { 0, }, \ 155 .fr = { 0, }, \ 156 .sr = { 0, }, \ 157 .iasq = { 0, }, \ 158 .iaoq = { 0, }, \ 159 .cr27 = 0, \ 160 }, \ 161 .task_size = DEFAULT_TASK_SIZE, \ 162 .map_base = DEFAULT_MAP_BASE, \ 163 .flags = 0 \ 164 } 165 166 /* 167 * Return saved PC of a blocked thread. This is used by ps mostly. 168 */ 169 170 struct task_struct; 171 unsigned long thread_saved_pc(struct task_struct *t); 172 void show_trace(struct task_struct *task, unsigned long *stack); 173 174 /* 175 * Start user thread in another space. 176 * 177 * Note that we set both the iaoq and r31 to the new pc. When 178 * the kernel initially calls execve it will return through an 179 * rfi path that will use the values in the iaoq. The execve 180 * syscall path will return through the gateway page, and 181 * that uses r31 to branch to. 182 * 183 * For ELF we clear r23, because the dynamic linker uses it to pass 184 * the address of the finalizer function. 185 * 186 * We also initialize sr3 to an illegal value (illegal for our 187 * implementation, not for the architecture). 188 */ 189 typedef unsigned int elf_caddr_t; 190 191 /* The ELF abi wants things done a "wee bit" differently than 192 * som does. Supporting this behavior here avoids 193 * having our own version of create_elf_tables. 194 * 195 * Oh, and yes, that is not a typo, we are really passing argc in r25 196 * and argv in r24 (rather than r26 and r25). This is because that's 197 * where __libc_start_main wants them. 198 * 199 * Duplicated from dl-machine.h for the benefit of readers: 200 * 201 * Our initial stack layout is rather different from everyone else's 202 * due to the unique PA-RISC ABI. As far as I know it looks like 203 * this: 204 205 ----------------------------------- (user startup code creates this frame) 206 | 32 bytes of magic | 207 |---------------------------------| 208 | 32 bytes argument/sp save area | 209 |---------------------------------| (bprm->p) 210 | ELF auxiliary info | 211 | (up to 28 words) | 212 |---------------------------------| 213 | NULL | 214 |---------------------------------| 215 | Environment pointers | 216 |---------------------------------| 217 | NULL | 218 |---------------------------------| 219 | Argument pointers | 220 |---------------------------------| <- argv 221 | argc (1 word) | 222 |---------------------------------| <- bprm->exec (HACK!) 223 | N bytes of slack | 224 |---------------------------------| 225 | filename passed to execve | 226 |---------------------------------| (mm->env_end) 227 | env strings | 228 |---------------------------------| (mm->env_start, mm->arg_end) 229 | arg strings | 230 |---------------------------------| 231 | additional faked arg strings if | 232 | we're invoked via binfmt_script | 233 |---------------------------------| (mm->arg_start) 234 stack base is at TASK_SIZE - rlim_max. 235 236 on downward growing arches, it looks like this: 237 stack base at TASK_SIZE 238 | filename passed to execve 239 | env strings 240 | arg strings 241 | faked arg strings 242 | slack 243 | ELF 244 | envps 245 | argvs 246 | argc 247 248 * The pleasant part of this is that if we need to skip arguments we 249 * can just decrement argc and move argv, because the stack pointer 250 * is utterly unrelated to the location of the environment and 251 * argument vectors. 252 * 253 * Note that the S/390 people took the easy way out and hacked their 254 * GCC to make the stack grow downwards. 255 * 256 * Final Note: For entry from syscall, the W (wide) bit of the PSW 257 * is stuffed into the lowest bit of the user sp (%r30), so we fill 258 * it in here from the current->personality 259 */ 260 261 #ifdef CONFIG_64BIT 262 #define USER_WIDE_MODE (!test_thread_flag(TIF_32BIT)) 263 #else 264 #define USER_WIDE_MODE 0 265 #endif 266 267 #define start_thread(regs, new_pc, new_sp) do { \ 268 elf_addr_t *sp = (elf_addr_t *)new_sp; \ 269 __u32 spaceid = (__u32)current->mm->context; \ 270 elf_addr_t pc = (elf_addr_t)new_pc | 3; \ 271 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \ 272 \ 273 regs->iasq[0] = spaceid; \ 274 regs->iasq[1] = spaceid; \ 275 regs->iaoq[0] = pc; \ 276 regs->iaoq[1] = pc + 4; \ 277 regs->sr[2] = LINUX_GATEWAY_SPACE; \ 278 regs->sr[3] = 0xffff; \ 279 regs->sr[4] = spaceid; \ 280 regs->sr[5] = spaceid; \ 281 regs->sr[6] = spaceid; \ 282 regs->sr[7] = spaceid; \ 283 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \ 284 regs->fr[ 0] = 0LL; \ 285 regs->fr[ 1] = 0LL; \ 286 regs->fr[ 2] = 0LL; \ 287 regs->fr[ 3] = 0LL; \ 288 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \ 289 regs->gr[31] = pc; \ 290 \ 291 get_user(regs->gr[25], (argv - 1)); \ 292 regs->gr[24] = (long) argv; \ 293 regs->gr[23] = 0; \ 294 } while(0) 295 296 struct task_struct; 297 struct mm_struct; 298 299 /* Free all resources held by a thread. */ 300 extern void release_thread(struct task_struct *); 301 302 extern unsigned long get_wchan(struct task_struct *p); 303 304 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0]) 305 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30]) 306 307 #define cpu_relax() barrier() 308 309 /* 310 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT 311 * cached CPUs which require a guarantee of coherency (no inequivalent aliases 312 * with different data, whether clean or not) to operate 313 */ 314 #ifdef CONFIG_PA8X00 315 extern int _parisc_requires_coherency; 316 #define parisc_requires_coherency() _parisc_requires_coherency 317 #else 318 #define parisc_requires_coherency() (0) 319 #endif 320 321 #endif /* __ASSEMBLY__ */ 322 323 #endif /* __ASM_PARISC_PROCESSOR_H */ 324