WebSVN - shark - Blame - Rev 3 - /shark/trunk/include/ll/i386/hw-func.h

Rev	Author	Line No.	Line
2	pj	1	/* Project: OSLib
		2	* Description: The OS Construction Kit
		3	* Date: 1.6.2000
		4	* Idea by: Luca Abeni & Gerardo Lamastra
		5	*
		6	* OSLib is an SO project aimed at developing a common, easy-to-use
		7	* low-level infrastructure for developing OS kernels and Embedded
		8	* Applications; it partially derives from the HARTIK project but it
		9	* currently is independently developed.
		10	*
		11	* OSLib is distributed under GPL License, and some of its code has
		12	* been derived from the Linux kernel source; also some important
		13	* ideas come from studying the DJGPP go32 extender.
		14	*
		15	* We acknowledge the Linux Community, Free Software Foundation,
		16	* D.J. Delorie and all the other developers who believe in the
		17	* freedom of software and ideas.
		18	*
		19	* For legalese, check out the included GPL license.
		20	*/
		21
		22	/* As the name says...
		23	All the hardware-dependent functions
		24	IDT/GDT management
		25	context switch
		26	IRQ/Exc handling... */
		27
		28	#ifndef __LL_I386_HW_FUNC_H__
		29	#define __LL_I386_HW_FUNC_H__
		30
		31	#include <ll/i386/defs.h>
		32	BEGIN_DEF
		33
		34	#include <ll/i386/hw-instr.h>
		35
		36	/* Low level exit functions! It will halt, reboot or
		37	* give back the control to X, depending on how YAMME started...
		38	*/
		39	void __exit(int code) __attribute__((noreturn));
		40	void halt(void);
		41
		42	/* Functions to reboot the machine */
		43	void cold_reboot(void);
		44	void warm_reboot(void);
		45	void reboot(int mode);
		46
		47	/* System tables management functions */
		48	void IDT_place(BYTE num,void (*handler)(void));
		49	void GDT_place(WORD sel,DWORD base,DWORD lim,BYTE acc,BYTE gran);
		50	DWORD GDT_read(WORD sel,DWORD lim,BYTE acc,BYTE *gran);
		51	LIN_ADDR addr2linear(unsigned short sel,unsigned long offset);
		52
		53	/* These 3 function realize the context switching. The context_save has */
		54	/* to be the first call of a kernel primitive, and the context_change has */
		55	/* to be the last call. */
		56	/* The context_save disables the interrupt (a kernel primitive must be */
		57	/* atomic) and return the context of the running task. */
		58	/* The context_change take the context of the new task (or of the */
		59	/* same task), switch to the new context and return restoring the flag */
		60	/* register. */
		61	/* The context_load is used when the task is going to be killed; then its */
		62	/* context does not need to be saved; we only need to load the context of */
		63	/* the new task; the effective implementation of this functions can vary */
		64	/* greatly throughout different implementations as some of them are */
		65	/* mapped to empty functions or mapped one onto another */
		66
		67	CONTEXT ll_context_save(void);
		68	void ll_context_change(CONTEXT c);
		69	void ll_context_load(CONTEXT c);
		70
		71	CONTEXT ll_context_from(void);
		72	void ll_context_to(CONTEXT c);
		73
		74
		75
		76	void *l1_init(void);
		77	void l1_end(void);
		78	void l1_exc_bind(int i, void (*f)(int n));
		79	void l1_irq_bind(int i, void (*f)(int n));
		80
		81
		82	END_DEF
		83
		84	#endif

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