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/prefetch.h> 16 #include <asm/hardware.h> 17 #include <asm/pdc.h> 18 #include <asm/ptrace.h> 19 #include <asm/types.h> 20 #include <asm/percpu.h> 21 #endif /* __ASSEMBLY__ */ 22 23 /* 24 * Default implementation of macro that returns current 25 * instruction pointer ("program counter"). 26 */ 27 #ifdef CONFIG_PA20 28 #define current_ia(x) __asm__("mfia %0" : "=r"(x)) 29 #else /* mfia added in pa2.0 */ 30 #define current_ia(x) __asm__("blr 0,%0\n\tnop" : "=r"(x)) 31 #endif 32 #define current_text_addr() ({ void *pc; current_ia(pc); pc; }) 33 34 #define HAVE_ARCH_PICK_MMAP_LAYOUT 35 36 #define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) 37 #define TASK_SIZE TASK_SIZE_OF(current) 38 #define TASK_UNMAPPED_BASE (current->thread.map_base) 39 40 #define DEFAULT_TASK_SIZE32 (0xFFF00000UL) 41 #define DEFAULT_MAP_BASE32 (0x40000000UL) 42 43 #ifdef CONFIG_64BIT 44 #define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000) 45 #define DEFAULT_MAP_BASE (0x200000000UL) 46 #else 47 #define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32 48 #define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32 49 #endif 50 51 #ifdef __KERNEL__ 52 53 /* XXX: STACK_TOP actually should be STACK_BOTTOM for parisc. 54 * prumpf */ 55 56 #define STACK_TOP TASK_SIZE 57 #define STACK_TOP_MAX DEFAULT_TASK_SIZE 58 59 /* Allow bigger stacks for 64-bit processes */ 60 #define STACK_SIZE_MAX (USER_WIDE_MODE \ 61 ? (1 << 30) /* 1 GB */ \ 62 : (CONFIG_MAX_STACK_SIZE_MB*1024*1024)) 63 64 #endif 65 66 #ifndef __ASSEMBLY__ 67 68 /* 69 * Data detected about CPUs at boot time which is the same for all CPU's. 70 * HP boxes are SMP - ie identical processors. 71 * 72 * FIXME: some CPU rev info may be processor specific... 73 */ 74 struct system_cpuinfo_parisc { 75 unsigned int cpu_count; 76 unsigned int cpu_hz; 77 unsigned int hversion; 78 unsigned int sversion; 79 enum cpu_type cpu_type; 80 81 struct { 82 struct pdc_model model; 83 unsigned long versions; 84 unsigned long cpuid; 85 unsigned long capabilities; 86 char sys_model_name[81]; /* PDC-ROM returnes this model name */ 87 } pdc; 88 89 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */ 90 const char *family_name; /* e.g. "1.1e" */ 91 }; 92 93 94 /* Per CPU data structure - ie varies per CPU. */ 95 struct cpuinfo_parisc { 96 unsigned long it_value; /* Interval Timer at last timer Intr */ 97 unsigned long irq_count; /* number of IRQ's since boot */ 98 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */ 99 unsigned long hpa; /* Host Physical address */ 100 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */ 101 #ifdef CONFIG_SMP 102 unsigned long pending_ipi; /* bitmap of type ipi_message_type */ 103 #endif 104 unsigned long bh_count; /* number of times bh was invoked */ 105 unsigned long fp_rev; 106 unsigned long fp_model; 107 unsigned long cpu_num; /* CPU number from PAT firmware */ 108 unsigned long cpu_loc; /* CPU location from PAT firmware */ 109 unsigned int state; 110 struct parisc_device *dev; 111 unsigned long loops_per_jiffy; 112 }; 113 114 extern struct system_cpuinfo_parisc boot_cpu_data; 115 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data); 116 117 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) 118 119 typedef struct { 120 int seg; 121 } mm_segment_t; 122 123 #define ARCH_MIN_TASKALIGN 8 124 125 struct thread_struct { 126 struct pt_regs regs; 127 unsigned long task_size; 128 unsigned long map_base; 129 unsigned long flags; 130 }; 131 132 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs)) 133 134 /* Thread struct flags. */ 135 #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */ 136 #define PARISC_UAC_SIGBUS (1UL << 1) 137 #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ 138 139 #define PARISC_UAC_SHIFT 0 140 #define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS) 141 142 #define SET_UNALIGN_CTL(task,value) \ 143 ({ \ 144 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \ 145 | (((value) << PARISC_UAC_SHIFT) & \ 146 PARISC_UAC_MASK)); \ 147 0; \ 148 }) 149 150 #define GET_UNALIGN_CTL(task,addr) \ 151 ({ \ 152 put_user(((task)->thread.flags & PARISC_UAC_MASK) \ 153 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \ 154 }) 155 156 #define INIT_THREAD { \ 157 .regs = { .gr = { 0, }, \ 158 .fr = { 0, }, \ 159 .sr = { 0, }, \ 160 .iasq = { 0, }, \ 161 .iaoq = { 0, }, \ 162 .cr27 = 0, \ 163 }, \ 164 .task_size = DEFAULT_TASK_SIZE, \ 165 .map_base = DEFAULT_MAP_BASE, \ 166 .flags = 0 \ 167 } 168 169 struct task_struct; 170 void show_trace(struct task_struct *task, unsigned long *stack); 171 172 /* 173 * Start user thread in another space. 174 * 175 * Note that we set both the iaoq and r31 to the new pc. When 176 * the kernel initially calls execve it will return through an 177 * rfi path that will use the values in the iaoq. The execve 178 * syscall path will return through the gateway page, and 179 * that uses r31 to branch to. 180 * 181 * For ELF we clear r23, because the dynamic linker uses it to pass 182 * the address of the finalizer function. 183 * 184 * We also initialize sr3 to an illegal value (illegal for our 185 * implementation, not for the architecture). 186 */ 187 typedef unsigned int elf_caddr_t; 188 189 /* The ELF abi wants things done a "wee bit" differently than 190 * som does. Supporting this behavior here avoids 191 * having our own version of create_elf_tables. 192 * 193 * Oh, and yes, that is not a typo, we are really passing argc in r25 194 * and argv in r24 (rather than r26 and r25). This is because that's 195 * where __libc_start_main wants them. 196 * 197 * Duplicated from dl-machine.h for the benefit of readers: 198 * 199 * Our initial stack layout is rather different from everyone else's 200 * due to the unique PA-RISC ABI. As far as I know it looks like 201 * this: 202 203 ----------------------------------- (user startup code creates this frame) 204 | 32 bytes of magic | 205 |---------------------------------| 206 | 32 bytes argument/sp save area | 207 |---------------------------------| (bprm->p) 208 | ELF auxiliary info | 209 | (up to 28 words) | 210 |---------------------------------| 211 | NULL | 212 |---------------------------------| 213 | Environment pointers | 214 |---------------------------------| 215 | NULL | 216 |---------------------------------| 217 | Argument pointers | 218 |---------------------------------| <- argv 219 | argc (1 word) | 220 |---------------------------------| <- bprm->exec (HACK!) 221 | N bytes of slack | 222 |---------------------------------| 223 | filename passed to execve | 224 |---------------------------------| (mm->env_end) 225 | env strings | 226 |---------------------------------| (mm->env_start, mm->arg_end) 227 | arg strings | 228 |---------------------------------| 229 | additional faked arg strings if | 230 | we're invoked via binfmt_script | 231 |---------------------------------| (mm->arg_start) 232 stack base is at TASK_SIZE - rlim_max. 233 234 on downward growing arches, it looks like this: 235 stack base at TASK_SIZE 236 | filename passed to execve 237 | env strings 238 | arg strings 239 | faked arg strings 240 | slack 241 | ELF 242 | envps 243 | argvs 244 | argc 245 246 * The pleasant part of this is that if we need to skip arguments we 247 * can just decrement argc and move argv, because the stack pointer 248 * is utterly unrelated to the location of the environment and 249 * argument vectors. 250 * 251 * Note that the S/390 people took the easy way out and hacked their 252 * GCC to make the stack grow downwards. 253 * 254 * Final Note: For entry from syscall, the W (wide) bit of the PSW 255 * is stuffed into the lowest bit of the user sp (%r30), so we fill 256 * it in here from the current->personality 257 */ 258 259 #define USER_WIDE_MODE (!is_32bit_task()) 260 261 #define start_thread(regs, new_pc, new_sp) do { \ 262 elf_addr_t *sp = (elf_addr_t *)new_sp; \ 263 __u32 spaceid = (__u32)current->mm->context; \ 264 elf_addr_t pc = (elf_addr_t)new_pc | 3; \ 265 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \ 266 \ 267 regs->iasq[0] = spaceid; \ 268 regs->iasq[1] = spaceid; \ 269 regs->iaoq[0] = pc; \ 270 regs->iaoq[1] = pc + 4; \ 271 regs->sr[2] = LINUX_GATEWAY_SPACE; \ 272 regs->sr[3] = 0xffff; \ 273 regs->sr[4] = spaceid; \ 274 regs->sr[5] = spaceid; \ 275 regs->sr[6] = spaceid; \ 276 regs->sr[7] = spaceid; \ 277 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \ 278 regs->fr[ 0] = 0LL; \ 279 regs->fr[ 1] = 0LL; \ 280 regs->fr[ 2] = 0LL; \ 281 regs->fr[ 3] = 0LL; \ 282 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \ 283 regs->gr[31] = pc; \ 284 \ 285 get_user(regs->gr[25], (argv - 1)); \ 286 regs->gr[24] = (long) argv; \ 287 regs->gr[23] = 0; \ 288 } while(0) 289 290 struct task_struct; 291 struct mm_struct; 292 293 /* Free all resources held by a thread. */ 294 extern void release_thread(struct task_struct *); 295 296 extern unsigned long get_wchan(struct task_struct *p); 297 298 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0]) 299 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30]) 300 301 #define cpu_relax() barrier() 302 303 /* 304 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT 305 * cached CPUs which require a guarantee of coherency (no inequivalent aliases 306 * with different data, whether clean or not) to operate 307 */ 308 #ifdef CONFIG_PA8X00 309 extern int _parisc_requires_coherency; 310 #define parisc_requires_coherency() _parisc_requires_coherency 311 #else 312 #define parisc_requires_coherency() (0) 313 #endif 314 315 extern int running_on_qemu; 316 317 #endif /* __ASSEMBLY__ */ 318 319 #endif /* __ASM_PARISC_PROCESSOR_H */ 320