1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* include/asm/processor.h 3 * 4 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu) 5 */ 6 7 #ifndef __ASM_SPARC_PROCESSOR_H 8 #define __ASM_SPARC_PROCESSOR_H 9 10 #include <asm/psr.h> 11 #include <asm/ptrace.h> 12 #include <asm/head.h> 13 #include <asm/signal.h> 14 #include <asm/page.h> 15 16 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too... 17 * That one page is used to protect kernel from intruders, so that 18 * we can make our access_ok test faster 19 */ 20 #define TASK_SIZE PAGE_OFFSET 21 #ifdef __KERNEL__ 22 #define STACK_TOP (PAGE_OFFSET - PAGE_SIZE) 23 #define STACK_TOP_MAX STACK_TOP 24 #endif /* __KERNEL__ */ 25 26 struct task_struct; 27 28 #ifdef __KERNEL__ 29 struct fpq { 30 unsigned long *insn_addr; 31 unsigned long insn; 32 }; 33 #endif 34 35 typedef struct { 36 int seg; 37 } mm_segment_t; 38 39 /* The Sparc processor specific thread struct. */ 40 struct thread_struct { 41 struct pt_regs *kregs; 42 unsigned int _pad1; 43 44 /* Special child fork kpsr/kwim values. */ 45 unsigned long fork_kpsr __attribute__ ((aligned (8))); 46 unsigned long fork_kwim; 47 48 /* Floating point regs */ 49 unsigned long float_regs[32] __attribute__ ((aligned (8))); 50 unsigned long fsr; 51 unsigned long fpqdepth; 52 struct fpq fpqueue[16]; 53 unsigned long flags; 54 mm_segment_t current_ds; 55 }; 56 57 #define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */ 58 #define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */ 59 60 #define INIT_THREAD { \ 61 .flags = SPARC_FLAG_KTHREAD, \ 62 .current_ds = KERNEL_DS, \ 63 } 64 65 /* Do necessary setup to start up a newly executed thread. */ 66 static inline void start_thread(struct pt_regs * regs, unsigned long pc, 67 unsigned long sp) 68 { 69 register unsigned long zero asm("g1"); 70 71 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S; 72 regs->pc = ((pc & (~3)) - 4); 73 regs->npc = regs->pc + 4; 74 regs->y = 0; 75 zero = 0; 76 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t" 77 "std\t%%g0, [%0 + %3 + 0x08]\n\t" 78 "std\t%%g0, [%0 + %3 + 0x10]\n\t" 79 "std\t%%g0, [%0 + %3 + 0x18]\n\t" 80 "std\t%%g0, [%0 + %3 + 0x20]\n\t" 81 "std\t%%g0, [%0 + %3 + 0x28]\n\t" 82 "std\t%%g0, [%0 + %3 + 0x30]\n\t" 83 "st\t%1, [%0 + %3 + 0x38]\n\t" 84 "st\t%%g0, [%0 + %3 + 0x3c]" 85 : /* no outputs */ 86 : "r" (regs), 87 "r" (sp - sizeof(struct reg_window32)), 88 "r" (zero), 89 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])) 90 : "memory"); 91 } 92 93 /* Free all resources held by a thread. */ 94 #define release_thread(tsk) do { } while(0) 95 96 unsigned long get_wchan(struct task_struct *); 97 98 #define task_pt_regs(tsk) ((tsk)->thread.kregs) 99 #define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc) 100 #define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP]) 101 102 #ifdef __KERNEL__ 103 104 extern struct task_struct *last_task_used_math; 105 int do_mathemu(struct pt_regs *regs, struct task_struct *fpt); 106 107 #define cpu_relax() barrier() 108 109 extern void (*sparc_idle)(void); 110 111 #endif 112 113 #endif /* __ASM_SPARC_PROCESSOR_H */ 114