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