system.h

基于组件方式开发操作系统的OSKIT源代码

#ifndef __ASM_ARM_SYSTEM_H
#define __ASM_ARM_SYSTEM_H

#include <linux/kernel.h>

#ifdef __KERNEL__

#include <linux/config.h>

#define __ebsa285_data		__attribute__((__section__(".data.ebsa285")))
#define __netwinder_data	__attribute__((__section__(".data.netwinder")))

#ifdef CONFIG_TEXT_SECTIONS
#define __ebsa285_text		__attribute__((__section__(".text.ebsa285")))
#define __netwinder_text	__attribute__((__section__(".text.netwinder")))
#else
#define __ebsa285_text
#define __netwinder_text
#endif

/* The type of machine we're running on */
extern unsigned int __machine_arch_type;

#define MACH_TYPE_EBSA110	0
#define MACH_TYPE_RISCPC	1
#define MACH_TYPE_NEXUSPCI	3
#define MACH_TYPE_EBSA285	4
#define MACH_TYPE_NETWINDER	5
#define MACH_TYPE_CATS		6
#define MACH_TYPE_TBOX		7
#define MACH_TYPE_CO285		8
#define MACH_TYPE_CLPS7110	9
#define MACH_TYPE_ARCHIMEDES	10
#define MACH_TYPE_A5K		11

/*
 * Sort out a definition for machine_arch_type
 * The rules basically are:
 * 1. If one architecture is selected, then all machine_is_xxx()
 *    are constant.
 * 2. If two or more architectures are selected, then the selected
 *    machine_is_xxx() are variable, and the unselected machine_is_xxx()
 *    are constant zero.
 */
#ifdef CONFIG_ARCH_EBSA110
# ifdef machine_arch_type
#  undef machine_arch_type
#  define machine_arch_type	__machine_arch_type
# else
#  define machine_arch_type	MACH_TYPE_EBSA110
# endif
# define machine_is_ebsa110()	(machine_arch_type == MACH_TYPE_EBSA110)
#else
# define machine_is_ebsa110()	(0)
#endif

#ifdef CONFIG_ARCH_RPC
# ifdef machine_arch_type
#  undef machine_arch_type
#  define machine_arch_type	__machine_arch_type
# else
#  define machine_arch_type	MACH_TYPE_RISCPC
# endif
# define machine_is_riscpc()	(machine_arch_type == MACH_TYPE_RISCPC)
#else
# define machine_is_riscpc()	(0)
#endif

#ifdef CONFIG_ARCH_EBSA285
# ifdef machine_arch_type
#  undef machine_arch_type
#  define machine_arch_type	__machine_arch_type
# else
#  define machine_arch_type	MACH_TYPE_EBSA285
# endif
# define machine_is_ebsa285()	(machine_arch_type == MACH_TYPE_EBSA285)
#else
# define machine_is_ebsa285()	(0)
#endif

#ifdef CONFIG_ARCH_NETWINDER
# ifdef machine_arch_type
#  undef machine_arch_type
#  define machine_arch_type	__machine_arch_type
# else
#  define machine_arch_type	MACH_TYPE_NETWINDER
# endif
# define machine_is_netwinder()	(machine_arch_type == MACH_TYPE_NETWINDER)
#else
# define machine_is_netwinder()	(0)
#endif

#ifdef CONFIG_CATS
# ifdef machine_arch_type
#  undef machine_arch_type
#  define machine_arch_type	__machine_arch_type
# else
#  define machine_arch_type	MACH_TYPE_CATS
# endif
# define machine_is_cats()	(machine_arch_type == MACH_TYPE_CATS)
#else
# define machine_is_cats()	(0)
#endif

#ifdef CONFIG_ARCH_CO285
# ifdef machine_arch_type
#  undef machine_arch_type
#  define machine_arch_type	__machine_arch_type
# else
#  define machine_arch_type	MACH_TYPE_CO285
# endif
# define machine_is_co285()	(machine_arch_type == MACH_TYPE_CO285)
#else
# define machine_is_co285()	(0)
#endif

#ifndef machine_arch_type
#define machine_arch_type	__machine_arch_type
#endif

/*
 * task_struct isn't always declared - forward-declare it here.
 */
struct task_struct;

#include <asm/proc-fns.h>

extern void arm_malalignedptr(const char *, void *, volatile void *);
extern void arm_invalidptr(const char *, int);

#define xchg(ptr,x) \
	((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))

#define tas(ptr) (xchg((ptr),1))

/*
 * switch_to(prev, next) should switch from task `prev' to `next'
 * `prev' will never be the same as `next'.
 *
 * `next' and `prev' should be struct task_struct, but it isn't always defined
 */
#define switch_to(prev,next,last) do { last = processor._switch_to(prev,next); } while (0)

/*
 * Include processor dependent parts
 */
#include <asm/proc/system.h>
#include <asm/arch/system.h>

#define mb() __asm__ __volatile__ ("" : : : "memory")
#define rmb() mb()
#define wmb() mb()
#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");

extern asmlinkage void __backtrace(void);

#endif

#endif