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