1 /* $Id: processor.h,v 1.83 2001/10/08 09:32:13 davem Exp $
2 * include/asm-sparc/processor.h
4 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
7 #ifndef __ASM_SPARC_PROCESSOR_H
8 #define __ASM_SPARC_PROCESSOR_H
11 * Sparc32 implementation of macro that returns current
12 * instruction pointer ("program counter").
14 #define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;\n1:" : "=r" (pc)); pc; })
16 #include <linux/a.out.h>
19 #include <asm/ptrace.h>
21 #include <asm/signal.h>
22 #include <asm/btfixup.h>
26 * The sparc has no problems with write protection
29 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
31 /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
32 * That one page is used to protect kernel from intruders, so that
33 * we can make our access_ok test faster
35 #define TASK_SIZE PAGE_OFFSET
37 #define STACK_TOP (PAGE_OFFSET - PAGE_SIZE)
38 #define STACK_TOP_MAX STACK_TOP
39 #endif /* __KERNEL__ */
45 unsigned long *insn_addr;
54 /* The Sparc processor specific thread struct. */
55 struct thread_struct {
56 struct pt_regs *kregs;
59 /* Special child fork kpsr/kwim values. */
60 unsigned long fork_kpsr __attribute__ ((aligned (8)));
61 unsigned long fork_kwim;
63 /* Floating point regs */
64 unsigned long float_regs[32] __attribute__ ((aligned (8)));
66 unsigned long fpqdepth;
67 struct fpq fpqueue[16];
69 mm_segment_t current_ds;
70 struct exec core_exec; /* just what it says. */
74 #define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
75 #define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
77 #define INIT_THREAD { \
78 .flags = SPARC_FLAG_KTHREAD, \
79 .current_ds = KERNEL_DS, \
82 /* Return saved PC of a blocked thread. */
83 extern unsigned long thread_saved_pc(struct task_struct *t);
85 /* Do necessary setup to start up a newly executed thread. */
86 static inline void start_thread(struct pt_regs * regs, unsigned long pc,
89 register unsigned long zero asm("g1");
91 regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
92 regs->pc = ((pc & (~3)) - 4);
93 regs->npc = regs->pc + 4;
96 __asm__ __volatile__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
97 "std\t%%g0, [%0 + %3 + 0x08]\n\t"
98 "std\t%%g0, [%0 + %3 + 0x10]\n\t"
99 "std\t%%g0, [%0 + %3 + 0x18]\n\t"
100 "std\t%%g0, [%0 + %3 + 0x20]\n\t"
101 "std\t%%g0, [%0 + %3 + 0x28]\n\t"
102 "std\t%%g0, [%0 + %3 + 0x30]\n\t"
103 "st\t%1, [%0 + %3 + 0x38]\n\t"
104 "st\t%%g0, [%0 + %3 + 0x3c]"
107 "r" (sp - sizeof(struct reg_window)),
109 "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0]))
113 /* Free all resources held by a thread. */
114 #define release_thread(tsk) do { } while(0)
115 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
117 /* Prepare to copy thread state - unlazy all lazy status */
118 #define prepare_to_copy(tsk) do { } while (0)
120 extern unsigned long get_wchan(struct task_struct *);
122 #define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
123 #define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
127 extern struct task_struct *last_task_used_math;
129 #define cpu_relax() barrier()
133 #endif /* __ASM_SPARC_PROCESSOR_H */