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 #include <linux/irqreturn.h> 15 16 #include <asm/assembly.h> 17 #include <asm/prefetch.h> 18 #include <asm/hardware.h> 19 #include <asm/pdc.h> 20 #include <asm/ptrace.h> 21 #include <asm/types.h> 22 #include <asm/percpu.h> 23 #endif /* __ASSEMBLY__ */ 24 25 #define HAVE_ARCH_PICK_MMAP_LAYOUT 26 27 #define TASK_SIZE_OF(tsk) ((tsk)->thread.task_size) 28 #define TASK_SIZE TASK_SIZE_OF(current) 29 #define TASK_UNMAPPED_BASE (current->thread.map_base) 30 31 #define DEFAULT_TASK_SIZE32 (0xFFF00000UL) 32 #define DEFAULT_MAP_BASE32 (0x40000000UL) 33 34 #ifdef CONFIG_64BIT 35 #define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000) 36 #define DEFAULT_MAP_BASE (0x200000000UL) 37 #else 38 #define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32 39 #define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32 40 #endif 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 #ifndef __ASSEMBLY__ 49 50 unsigned long calc_max_stack_size(unsigned long stack_max); 51 52 /* 53 * Data detected about CPUs at boot time which is the same for all CPU's. 54 * HP boxes are SMP - ie identical processors. 55 * 56 * FIXME: some CPU rev info may be processor specific... 57 */ 58 struct system_cpuinfo_parisc { 59 unsigned int cpu_count; 60 unsigned int cpu_hz; 61 unsigned int hversion; 62 unsigned int sversion; 63 enum cpu_type cpu_type; 64 65 struct { 66 struct pdc_model model; 67 unsigned long versions; 68 unsigned long cpuid; 69 unsigned long capabilities; 70 char sys_model_name[81]; /* PDC-ROM returnes this model name */ 71 } pdc; 72 73 const char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */ 74 const char *family_name; /* e.g. "1.1e" */ 75 }; 76 77 78 /* Per CPU data structure - ie varies per CPU. */ 79 struct cpuinfo_parisc { 80 unsigned long it_value; /* Interval Timer at last timer Intr */ 81 unsigned long irq_count; /* number of IRQ's since boot */ 82 unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */ 83 unsigned long hpa; /* Host Physical address */ 84 unsigned long txn_addr; /* MMIO addr of EIR or id_eid */ 85 #ifdef CONFIG_SMP 86 unsigned long pending_ipi; /* bitmap of type ipi_message_type */ 87 #endif 88 unsigned long bh_count; /* number of times bh was invoked */ 89 unsigned long fp_rev; 90 unsigned long fp_model; 91 unsigned long cpu_num; /* CPU number from PAT firmware */ 92 unsigned long cpu_loc; /* CPU location from PAT firmware */ 93 unsigned int state; 94 struct parisc_device *dev; 95 }; 96 97 extern struct system_cpuinfo_parisc boot_cpu_data; 98 DECLARE_PER_CPU(struct cpuinfo_parisc, cpu_data); 99 extern int time_keeper_id; /* CPU used for timekeeping */ 100 101 #define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) 102 103 struct thread_struct { 104 struct pt_regs regs; 105 unsigned long task_size; 106 unsigned long map_base; 107 unsigned long flags; 108 }; 109 110 #define task_pt_regs(tsk) ((struct pt_regs *)&((tsk)->thread.regs)) 111 112 /* Thread struct flags. */ 113 #define PARISC_UAC_NOPRINT (1UL << 0) /* see prctl and unaligned.c */ 114 #define PARISC_UAC_SIGBUS (1UL << 1) 115 #define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ 116 117 #define PARISC_UAC_SHIFT 0 118 #define PARISC_UAC_MASK (PARISC_UAC_NOPRINT|PARISC_UAC_SIGBUS) 119 120 #define SET_UNALIGN_CTL(task,value) \ 121 ({ \ 122 (task)->thread.flags = (((task)->thread.flags & ~PARISC_UAC_MASK) \ 123 | (((value) << PARISC_UAC_SHIFT) & \ 124 PARISC_UAC_MASK)); \ 125 0; \ 126 }) 127 128 #define GET_UNALIGN_CTL(task,addr) \ 129 ({ \ 130 put_user(((task)->thread.flags & PARISC_UAC_MASK) \ 131 >> PARISC_UAC_SHIFT, (int __user *) (addr)); \ 132 }) 133 134 #define INIT_THREAD { \ 135 .regs = { .gr = { 0, }, \ 136 .fr = { 0, }, \ 137 .sr = { 0, }, \ 138 .iasq = { 0, }, \ 139 .iaoq = { 0, }, \ 140 .cr27 = 0, \ 141 }, \ 142 .task_size = DEFAULT_TASK_SIZE, \ 143 .map_base = DEFAULT_MAP_BASE, \ 144 .flags = 0 \ 145 } 146 147 struct task_struct; 148 void show_trace(struct task_struct *task, unsigned long *stack); 149 150 /* 151 * Start user thread in another space. 152 * 153 * Note that we set both the iaoq and r31 to the new pc. When 154 * the kernel initially calls execve it will return through an 155 * rfi path that will use the values in the iaoq. The execve 156 * syscall path will return through the gateway page, and 157 * that uses r31 to branch to. 158 * 159 * For ELF we clear r23, because the dynamic linker uses it to pass 160 * the address of the finalizer function. 161 * 162 * We also initialize sr3 to an illegal value (illegal for our 163 * implementation, not for the architecture). 164 */ 165 typedef unsigned int elf_caddr_t; 166 167 /* The ELF abi wants things done a "wee bit" differently than 168 * som does. Supporting this behavior here avoids 169 * having our own version of create_elf_tables. 170 * 171 * Oh, and yes, that is not a typo, we are really passing argc in r25 172 * and argv in r24 (rather than r26 and r25). This is because that's 173 * where __libc_start_main wants them. 174 * 175 * Duplicated from dl-machine.h for the benefit of readers: 176 * 177 * Our initial stack layout is rather different from everyone else's 178 * due to the unique PA-RISC ABI. As far as I know it looks like 179 * this: 180 181 ----------------------------------- (user startup code creates this frame) 182 | 32 bytes of magic | 183 |---------------------------------| 184 | 32 bytes argument/sp save area | 185 |---------------------------------| (bprm->p) 186 | ELF auxiliary info | 187 | (up to 28 words) | 188 |---------------------------------| 189 | NULL | 190 |---------------------------------| 191 | Environment pointers | 192 |---------------------------------| 193 | NULL | 194 |---------------------------------| 195 | Argument pointers | 196 |---------------------------------| <- argv 197 | argc (1 word) | 198 |---------------------------------| <- bprm->exec (HACK!) 199 | N bytes of slack | 200 |---------------------------------| 201 | filename passed to execve | 202 |---------------------------------| (mm->env_end) 203 | env strings | 204 |---------------------------------| (mm->env_start, mm->arg_end) 205 | arg strings | 206 |---------------------------------| 207 | additional faked arg strings if | 208 | we're invoked via binfmt_script | 209 |---------------------------------| (mm->arg_start) 210 stack base is at TASK_SIZE - rlim_max. 211 212 on downward growing arches, it looks like this: 213 stack base at TASK_SIZE 214 | filename passed to execve 215 | env strings 216 | arg strings 217 | faked arg strings 218 | slack 219 | ELF 220 | envps 221 | argvs 222 | argc 223 224 * The pleasant part of this is that if we need to skip arguments we 225 * can just decrement argc and move argv, because the stack pointer 226 * is utterly unrelated to the location of the environment and 227 * argument vectors. 228 * 229 * Note that the S/390 people took the easy way out and hacked their 230 * GCC to make the stack grow downwards. 231 * 232 * Final Note: For entry from syscall, the W (wide) bit of the PSW 233 * is stuffed into the lowest bit of the user sp (%r30), so we fill 234 * it in here from the current->personality 235 */ 236 237 #define USER_WIDE_MODE (!is_32bit_task()) 238 239 #define start_thread(regs, new_pc, new_sp) do { \ 240 elf_addr_t *sp = (elf_addr_t *)new_sp; \ 241 __u32 spaceid = (__u32)current->mm->context.space_id; \ 242 elf_addr_t pc = (elf_addr_t)new_pc | 3; \ 243 elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \ 244 \ 245 regs->iasq[0] = spaceid; \ 246 regs->iasq[1] = spaceid; \ 247 regs->iaoq[0] = pc; \ 248 regs->iaoq[1] = pc + 4; \ 249 regs->sr[2] = LINUX_GATEWAY_SPACE; \ 250 regs->sr[3] = 0xffff; \ 251 regs->sr[4] = spaceid; \ 252 regs->sr[5] = spaceid; \ 253 regs->sr[6] = spaceid; \ 254 regs->sr[7] = spaceid; \ 255 regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \ 256 regs->fr[ 0] = 0LL; \ 257 regs->fr[ 1] = 0LL; \ 258 regs->fr[ 2] = 0LL; \ 259 regs->fr[ 3] = 0LL; \ 260 regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \ 261 regs->gr[31] = pc; \ 262 \ 263 get_user(regs->gr[25], (argv - 1)); \ 264 regs->gr[24] = (long) argv; \ 265 regs->gr[23] = 0; \ 266 } while(0) 267 268 struct mm_struct; 269 270 extern unsigned long __get_wchan(struct task_struct *p); 271 272 #define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0]) 273 #define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30]) 274 275 #define cpu_relax() barrier() 276 277 /* 278 * parisc_requires_coherency() is used to identify the combined VIPT/PIPT 279 * cached CPUs which require a guarantee of coherency (no inequivalent aliases 280 * with different data, whether clean or not) to operate 281 */ 282 #ifdef CONFIG_PA8X00 283 extern int _parisc_requires_coherency; 284 #define parisc_requires_coherency() _parisc_requires_coherency 285 #else 286 #define parisc_requires_coherency() (0) 287 #endif 288 289 extern int running_on_qemu; 290 291 extern void __noreturn toc_intr(struct pt_regs *regs); 292 extern void toc_handler(void); 293 extern unsigned int toc_handler_size; 294 extern unsigned int toc_handler_csum; 295 extern void do_cpu_irq_mask(struct pt_regs *); 296 extern irqreturn_t timer_interrupt(int, void *); 297 extern irqreturn_t ipi_interrupt(int, void *); 298 extern void start_cpu_itimer(void); 299 extern void handle_interruption(int, struct pt_regs *); 300 301 /* called from assembly code: */ 302 extern void start_parisc(void); 303 extern void smp_callin(unsigned long); 304 extern void sys_rt_sigreturn(struct pt_regs *, int); 305 extern void do_notify_resume(struct pt_regs *, long); 306 extern long do_syscall_trace_enter(struct pt_regs *); 307 extern void do_syscall_trace_exit(struct pt_regs *); 308 309 /* CPU startup and info */ 310 struct seq_file; 311 extern void early_trap_init(void); 312 extern void collect_boot_cpu_data(void); 313 extern int show_cpuinfo (struct seq_file *m, void *v); 314 315 /* driver code in driver/parisc */ 316 extern void processor_init(void); 317 struct parisc_device; 318 struct resource; 319 extern void sba_distributed_lmmio(struct parisc_device *, struct resource *); 320 extern void sba_directed_lmmio(struct parisc_device *, struct resource *); 321 extern void lba_set_iregs(struct parisc_device *lba, u32 ibase, u32 imask); 322 extern void ccio_cujo20_fixup(struct parisc_device *dev, u32 iovp); 323 324 #endif /* __ASSEMBLY__ */ 325 326 #endif /* __ASM_PARISC_PROCESSOR_H */ 327