+++ /dev/null
-/*
- * include/asm-xtensa/processor.h
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
- */
-
-#ifndef _XTENSA_PROCESSOR_H
-#define _XTENSA_PROCESSOR_H
-
-#include <asm/variant/core.h>
-#include <asm/coprocessor.h>
-
-#include <linux/compiler.h>
-#include <asm/ptrace.h>
-#include <asm/types.h>
-#include <asm/regs.h>
-
-/* Assertions. */
-
-#if (XCHAL_HAVE_WINDOWED != 1)
-# error Linux requires the Xtensa Windowed Registers Option.
-#endif
-
-/*
- * User space process size: 1 GB.
- * Windowed call ABI requires caller and callee to be located within the same
- * 1 GB region. The C compiler places trampoline code on the stack for sources
- * that take the address of a nested C function (a feature used by glibc), so
- * the 1 GB requirement applies to the stack as well.
- */
-
-#define TASK_SIZE __XTENSA_UL_CONST(0x40000000)
-#define STACK_TOP TASK_SIZE
-#define STACK_TOP_MAX STACK_TOP
-
-/*
- * General exception cause assigned to debug exceptions. Debug exceptions go
- * to their own vector, rather than the general exception vectors (user,
- * kernel, double); and their specific causes are reported via DEBUGCAUSE
- * rather than EXCCAUSE. However it is sometimes convenient to redirect debug
- * exceptions to the general exception mechanism. To do this, an otherwise
- * unused EXCCAUSE value was assigned to debug exceptions for this purpose.
- */
-
-#define EXCCAUSE_MAPPED_DEBUG 63
-
-/*
- * We use DEPC also as a flag to distinguish between double and regular
- * exceptions. For performance reasons, DEPC might contain the value of
- * EXCCAUSE for regular exceptions, so we use this definition to mark a
- * valid double exception address.
- * (Note: We use it in bgeui, so it should be 64, 128, or 256)
- */
-
-#define VALID_DOUBLE_EXCEPTION_ADDRESS 64
-
-/* LOCKLEVEL defines the interrupt level that masks all
- * general-purpose interrupts.
- */
-#define LOCKLEVEL 1
-
-/* WSBITS and WBBITS are the width of the WINDOWSTART and WINDOWBASE
- * registers
- */
-#define WSBITS (XCHAL_NUM_AREGS / 4) /* width of WINDOWSTART in bits */
-#define WBBITS (XCHAL_NUM_AREGS_LOG2 - 2) /* width of WINDOWBASE in bits */
-
-#ifndef __ASSEMBLY__
-
-/* Build a valid return address for the specified call winsize.
- * winsize must be 1 (call4), 2 (call8), or 3 (call12)
- */
-#define MAKE_RA_FOR_CALL(ra,ws) (((ra) & 0x3fffffff) | (ws) << 30)
-
-/* Convert return address to a valid pc
- * Note: We assume that the stack pointer is in the same 1GB ranges as the ra
- */
-#define MAKE_PC_FROM_RA(ra,sp) (((ra) & 0x3fffffff) | ((sp) & 0xc0000000))
-
-typedef struct {
- unsigned long seg;
-} mm_segment_t;
-
-struct thread_struct {
-
- /* kernel's return address and stack pointer for context switching */
- unsigned long ra; /* kernel's a0: return address and window call size */
- unsigned long sp; /* kernel's a1: stack pointer */
-
- mm_segment_t current_ds; /* see uaccess.h for example uses */
-
- /* struct xtensa_cpuinfo info; */
-
- unsigned long bad_vaddr; /* last user fault */
- unsigned long bad_uaddr; /* last kernel fault accessing user space */
- unsigned long error_code;
-
- unsigned long ibreak[XCHAL_NUM_IBREAK];
- unsigned long dbreaka[XCHAL_NUM_DBREAK];
- unsigned long dbreakc[XCHAL_NUM_DBREAK];
-
- /* Make structure 16 bytes aligned. */
- int align[0] __attribute__ ((aligned(16)));
-};
-
-
-/*
- * Default implementation of macro that returns current
- * instruction pointer ("program counter").
- */
-#define current_text_addr() ({ __label__ _l; _l: &&_l;})
-
-
-/* This decides where the kernel will search for a free chunk of vm
- * space during mmap's.
- */
-#define TASK_UNMAPPED_BASE (TASK_SIZE / 2)
-
-#define INIT_THREAD \
-{ \
- ra: 0, \
- sp: sizeof(init_stack) + (long) &init_stack, \
- current_ds: {0}, \
- /*info: {0}, */ \
- bad_vaddr: 0, \
- bad_uaddr: 0, \
- error_code: 0, \
-}
-
-
-/*
- * Do necessary setup to start up a newly executed thread.
- * Note: We set-up ps as if we did a call4 to the new pc.
- * set_thread_state in signal.c depends on it.
- */
-#define USER_PS_VALUE ((1 << PS_WOE_BIT) | \
- (1 << PS_CALLINC_SHIFT) | \
- (USER_RING << PS_RING_SHIFT) | \
- (1 << PS_UM_BIT) | \
- (1 << PS_EXCM_BIT))
-
-/* Clearing a0 terminates the backtrace. */
-#define start_thread(regs, new_pc, new_sp) \
- regs->pc = new_pc; \
- regs->ps = USER_PS_VALUE; \
- regs->areg[1] = new_sp; \
- regs->areg[0] = 0; \
- regs->wmask = 1; \
- regs->depc = 0; \
- regs->windowbase = 0; \
- regs->windowstart = 1;
-
-/* Forward declaration */
-struct task_struct;
-struct mm_struct;
-
-/* Free all resources held by a thread. */
-#define release_thread(thread) do { } while(0)
-
-/* Prepare to copy thread state - unlazy all lazy status */
-extern void prepare_to_copy(struct task_struct*);
-
-/* Create a kernel thread without removing it from tasklists */
-extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-
-/* Copy and release all segment info associated with a VM */
-#define copy_segments(p, mm) do { } while(0)
-#define release_segments(mm) do { } while(0)
-#define forget_segments() do { } while (0)
-
-#define thread_saved_pc(tsk) (task_pt_regs(tsk)->pc)
-
-extern unsigned long get_wchan(struct task_struct *p);
-
-#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
-#define KSTK_ESP(tsk) (task_pt_regs(tsk)->areg[1])
-
-#define cpu_relax() barrier()
-
-/* Special register access. */
-
-#define WSR(v,sr) __asm__ __volatile__ ("wsr %0,"__stringify(sr) :: "a"(v));
-#define RSR(v,sr) __asm__ __volatile__ ("rsr %0,"__stringify(sr) : "=a"(v));
-
-#define set_sr(x,sr) ({unsigned int v=(unsigned int)x; WSR(v,sr);})
-#define get_sr(sr) ({unsigned int v; RSR(v,sr); v; })
-
-#endif /* __ASSEMBLY__ */
-#endif /* _XTENSA_PROCESSOR_H */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff