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