processor.h
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- /* $Id: processor.h,v 1.83 2001/10/08 09:32:13 davem Exp $
- * include/asm-sparc/processor.h
- *
- * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
- */
- #ifndef __ASM_SPARC_PROCESSOR_H
- #define __ASM_SPARC_PROCESSOR_H
- /*
- * Sparc32 implementation of macro that returns current
- * instruction pointer ("program counter").
- */
- #define current_text_addr() ({ void *pc; __asm__("sethi %%hi(1f), %0; or %0, %%lo(1f), %0;n1:" : "=r" (pc)); pc; })
- #include <linux/a.out.h>
- #include <asm/psr.h>
- #include <asm/ptrace.h>
- #include <asm/head.h>
- #include <asm/signal.h>
- #include <asm/segment.h>
- #include <asm/btfixup.h>
- #include <asm/page.h>
- #include <asm/atomic.h>
- /*
- * Bus types
- */
- #define EISA_bus 0
- #define EISA_bus__is_a_macro /* for versions in ksyms.c */
- #define MCA_bus 0
- #define MCA_bus__is_a_macro /* for versions in ksyms.c */
- /*
- * The sparc has no problems with write protection
- */
- #define wp_works_ok 1
- #define wp_works_ok__is_a_macro /* for versions in ksyms.c */
- /* Whee, this is STACK_TOP + PAGE_SIZE and the lowest kernel address too...
- * That one page is used to protect kernel from intruders, so that
- * we can make our access_ok test faster
- */
- #define TASK_SIZE PAGE_OFFSET
- struct fpq {
- unsigned long *insn_addr;
- unsigned long insn;
- };
- typedef struct {
- int seg;
- } mm_segment_t;
- /* The Sparc processor specific thread struct. */
- struct thread_struct {
- unsigned long uwinmask __attribute__ ((aligned (8)));
- struct pt_regs *kregs;
- /* Context switch saved kernel state. */
- unsigned long ksp __attribute__ ((aligned (8)));
- unsigned long kpc;
- unsigned long kpsr;
- unsigned long kwim;
- /* Special child fork kpsr/kwim values. */
- unsigned long fork_kpsr __attribute__ ((aligned (8)));
- unsigned long fork_kwim;
- /* A place to store user windows and stack pointers
- * when the stack needs inspection.
- */
- #define NSWINS 8
- struct reg_window reg_window[NSWINS] __attribute__ ((aligned (8)));
- unsigned long rwbuf_stkptrs[NSWINS] __attribute__ ((aligned (8)));
- unsigned long w_saved;
- /* Floating point regs */
- unsigned long float_regs[32] __attribute__ ((aligned (8)));
- unsigned long fsr;
- unsigned long fpqdepth;
- struct fpq fpqueue[16];
- unsigned long flags;
- mm_segment_t current_ds;
- struct exec core_exec; /* just what it says. */
- int new_signal;
- atomic_t refcount; /* used for sun4c only */
- };
- #define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
- #define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
- #define INIT_THREAD {
- /* uwinmask, kregs, ksp, kpc, kpsr, kwim */
- 0, 0, 0, 0, 0, 0,
- /* fork_kpsr, fork_kwim */
- 0, 0,
- /* reg_window */
- { { { 0, }, { 0, } }, },
- /* rwbuf_stkptrs */
- { 0, 0, 0, 0, 0, 0, 0, 0, },
- /* w_saved */
- 0,
- /* FPU regs */ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, },
- /* FPU status, FPU qdepth, FPU queue */
- 0, 0, { { 0, 0, }, },
- /* flags, current_ds, */
- SPARC_FLAG_KTHREAD, KERNEL_DS,
- /* core_exec */
- { 0, },
- /* new_signal */
- 0,
- }
- /* Return saved PC of a blocked thread. */
- extern __inline__ unsigned long thread_saved_pc(struct thread_struct *t)
- {
- return t->kpc;
- }
- /* Do necessary setup to start up a newly executed thread. */
- extern __inline__ void start_thread(struct pt_regs * regs, unsigned long pc,
- unsigned long sp)
- {
- register unsigned long zero asm("g1");
- regs->psr = (regs->psr & (PSR_CWP)) | PSR_S;
- regs->pc = ((pc & (~3)) - 4);
- regs->npc = regs->pc + 4;
- regs->y = 0;
- zero = 0;
- __asm__ __volatile__("stdt%%g0, [%0 + %3 + 0x00]nt"
- "stdt%%g0, [%0 + %3 + 0x08]nt"
- "stdt%%g0, [%0 + %3 + 0x10]nt"
- "stdt%%g0, [%0 + %3 + 0x18]nt"
- "stdt%%g0, [%0 + %3 + 0x20]nt"
- "stdt%%g0, [%0 + %3 + 0x28]nt"
- "stdt%%g0, [%0 + %3 + 0x30]nt"
- "stt%1, [%0 + %3 + 0x38]nt"
- "stt%%g0, [%0 + %3 + 0x3c]"
- : : "r" (regs), "r" (sp - REGWIN_SZ), "r" (zero),
- "i" ((const unsigned long)(&((struct pt_regs *)0)->u_regs[0])));
- }
- /* Free all resources held by a thread. */
- #define release_thread(tsk) do { } while(0)
- extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
- #define copy_segments(tsk, mm) do { } while (0)
- #define release_segments(mm) do { } while (0)
- #define get_wchan(__TSK)
- ({ extern void scheduling_functions_start_here(void);
- extern void scheduling_functions_end_here(void);
- unsigned long pc, fp, bias = 0;
- unsigned long task_base = (unsigned long) (__TSK);
- unsigned long __ret = 0;
- struct reg_window *rw;
- int count = 0;
- if (!(__TSK) || (__TSK) == current ||
- (__TSK)->state == TASK_RUNNING)
- goto __out;
- fp = (__TSK)->thread.ksp + bias;
- do {
- /* Bogus frame pointer? */
- if (fp < (task_base + sizeof(struct task_struct)) ||
- fp >= (task_base + (2 * PAGE_SIZE)))
- break;
- rw = (struct reg_window *) fp;
- pc = rw->ins[7];
- if (pc < ((unsigned long) scheduling_functions_start_here) ||
- pc >= ((unsigned long) scheduling_functions_end_here)) {
- __ret = pc;
- goto __out;
- }
- fp = rw->ins[6] + bias;
- } while (++count < 16);
- __out: __ret;
- })
- #define KSTK_EIP(tsk) ((tsk)->thread.kregs->pc)
- #define KSTK_ESP(tsk) ((tsk)->thread.kregs->u_regs[UREG_FP])
- #ifdef __KERNEL__
- #define THREAD_SIZE (2*PAGE_SIZE)
- extern struct task_struct *last_task_used_math;
- /* Allocation and freeing of basic task resources. */
- BTFIXUPDEF_CALL(struct task_struct *, alloc_task_struct, void)
- BTFIXUPDEF_CALL(void, free_task_struct, struct task_struct *)
- BTFIXUPDEF_CALL(void, get_task_struct, struct task_struct *)
- #define alloc_task_struct() BTFIXUP_CALL(alloc_task_struct)()
- #define free_task_struct(tsk) BTFIXUP_CALL(free_task_struct)(tsk)
- #define get_task_struct(tsk) BTFIXUP_CALL(get_task_struct)(tsk)
- #define init_task (init_task_union.task)
- #define init_stack (init_task_union.stack)
- #define cpu_relax() do { } while (0)
- #endif
- #endif /* __ASM_SPARC_PROCESSOR_H */