/*
* Copyright (c) 2005-2007, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _ARCH_H
#define _ARCH_H
/*
* Common register frame for trap/interrupt.
* These cpu state are saved into top of the kernel stack in
* trap/interrupt entries. Since the arguments of system calls are
* passed via registers, the system call library is completely
* dependent on this register format.
*
* The value of ss & esp are not valid for kernel mode trap
* because these are set only when privilege level is changed.
*/
struct cpu_regs {
u_long ebx; /* +0 (00) --- s/w trap frame --- */
u_long ecx; /* +4 (04) */
u_long edx; /* +8 (08) */
u_long esi; /* +12 (0C) */
u_long edi; /* +16 (10) */
u_long ebp; /* +20 (14) */
u_long eax; /* +24 (18) */
u_long ds; /* +28 (1C) */
u_long es; /* +32 (20) */
u_long trap_no; /* +36 (24) --- h/w trap frame --- */
u_long err_code; /* +40 (28) */
u_long eip; /* +44 (2C) */
u_long cs; /* +48 (30) */
u_long eflags; /* +52 (34) */
u_long esp; /* +56 (38) */
u_long ss; /* +60 (3C) */
};
/*
* Kernel mode context for context switching.
*/
struct kern_regs {
u_long eip; /* +0 (00) */
u_long edi; /* +4 (04) */
u_long esi; /* +8 (08) */
u_long ebp; /* +12 (0C) */
u_long esp; /* +16 (10) */
};
#ifdef CONFIG_FPU
/*
* FPU register for fsave/frstor
*/
struct fpu_regs {
u_long ctrl_word;
u_long stat_word;
u_long tag_word;
u_long ip_offset;
u_long cs_sel;
u_long op_offset;
u_long op_sel;
u_long st[20];
};
#endif
/*
* Processor context
*/
struct context {
struct kern_regs kregs; /* kernel mode registers */
struct cpu_regs *uregs; /* user mode registers */
#ifdef CONFIG_FPU
struct fpu_regs *fregs; /* co-processor registers */
#endif
u_long esp0; /* top of kernel stack */
};
typedef struct context *context_t; /* context id */
/* types for context_set */
#define CTX_UENTRY 0 /* set user mode entry addres */
#define CTX_USTACK 1 /* set user mode stack address */
#define CTX_KENTRY 2 /* set kernel mode entry address */
#define CTX_KARG 3 /* set kernel mode argument */
extern void context_init(context_t, u_long);
extern void context_set(context_t, int, u_long);
extern void context_switch(context_t, context_t);
extern void context_save(context_t, int);
extern void context_restore(context_t, void *);
/*
* Memory Management Unit
*/
typedef long *pgd_t; /* page directory */
/* memory page type */
#define PG_UNMAP 0 /* no page */
#define PG_READ 1 /* read only */
#define PG_WRITE 2 /* read/write */
#ifdef CONFIG_MMU
extern void mmu_init(void);
extern pgd_t mmu_newmap(void);
extern void mmu_delmap(pgd_t);
extern int mmu_map(pgd_t, void *, void *, size_t, int);
extern void mmu_switch(pgd_t);
extern void *mmu_extract(pgd_t, void *, size_t);
#else /* CONFIG_MMU */
#define mmu_init() do {} while (0)
#endif /* CONFIG_MMU */
/*
* User Memory access
*/
extern int umem_copyin(void *, void *, size_t);
extern int umem_copyout(void *, void *, size_t);
extern int umem_strnlen(const char *, size_t, size_t *);
#define breakpoint() __asm__ __volatile__("int $3"::)
#endif /* !_ARCH_H */