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- /* $Id: processor.h,v 1.70 1999/03/24 11:42:44 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
-
- #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>
-
- /*
- * 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;
-
- /* For signal handling */
- unsigned long sig_address __attribute__ ((aligned (8)));
- unsigned long sig_desc;
-
- /* 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;
- };
-
- #define SPARC_FLAG_KTHREAD 0x1 /* task is a kernel thread */
- #define SPARC_FLAG_UNALIGNED 0x2 /* is allowed to do unaligned accesses */
-
- #define INIT_MMAP { &init_mm, (0), (0), \
- NULL, __pgprot(0x0) , VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
-
- #define INIT_TSS { \
- /* uwinmask, kregs, sig_address, sig_desc, ksp, kpc, kpsr, kwim */ \
- 0, 0, 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__("std\t%%g0, [%0 + %3 + 0x00]\n\t"
- "std\t%%g0, [%0 + %3 + 0x08]\n\t"
- "std\t%%g0, [%0 + %3 + 0x10]\n\t"
- "std\t%%g0, [%0 + %3 + 0x18]\n\t"
- "std\t%%g0, [%0 + %3 + 0x20]\n\t"
- "std\t%%g0, [%0 + %3 + 0x28]\n\t"
- "std\t%%g0, [%0 + %3 + 0x30]\n\t"
- "st\t%1, [%0 + %3 + 0x38]\n\t"
- "st\t%%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(__nr, __tsk, __mm) \
- if((__tsk) == current && \
- (__mm) != NULL) \
- flush_user_windows()
- #define release_segments(mm) do { } while (0)
- #define forget_segments() do { } while (0)
-
- #ifdef __KERNEL__
-
- 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 *)
-
- #define alloc_task_struct() BTFIXUP_CALL(alloc_task_struct)()
- #define free_task_struct(tsk) BTFIXUP_CALL(free_task_struct)(tsk)
-
- #define init_task (init_task_union.task)
- #define init_stack (init_task_union.stack)
-
- #endif
-
- #endif /* __ASM_SPARC_PROCESSOR_H */
-