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