WebSVN - shark - Blame - Rev 2 - /shark/branches/pj/oslib/xlib/x1.c

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	/* File: X1.C */
		23	/* Startup code: */
		24	/* Build parameters list & make info accessible */
		25
		26	#include <ll/i386/hw-func.h>
		27	#include <ll/stdlib.h>
		28	#include <ll/i386/cons.h>
		29	#include <ll/i386/mb-info.h>
		30
		31	#include <ll/i386/mem.h>
		32
		33	FILE(X1);
		34
		35	/* #define __DUMP_MEM__ */
		36
		37	/* We need to copy from X address space to the application space */
		38	/* the info structure to allow pointer access using flat model */
		39	/* Remember that flat model is similar to small model also if we */
		40	/* can see the whole memory, because it has no explicit far */
		41	/* pointers; then if we pass into _args[] the address of the */
		42	/* string of the n-th argument it could not be correctly accessed */
		43	/* because it lies in a memory zone unseen from PM application. */
		44	/* This is due to the ELF format which has no relocation info */
		45	/* since the file is already relocated starting from address 0! */
		46	/* Then the PM application cannot see a real flat memory (segment */
		47	/* with 0 base) but CS,DS & SS MUST have the base correctly set. */
		48	/* Refer to this figure: */
		49	/* */
		50	/* DOS Memory <- X is there */
		51	/* */
		52	/* EXTENDED Memory -----[ */
		53	/* [ */
		54	/* Address xxxx [ <- Application code is here! */
		55	/* [ */
		56	/* Address yyyy [ <- Application Data & Stack! */
		57	/* */
		58	/* Then CS has xxxx base while DS & SS have yyyy base! */
		59
		60	/* Stack base address; use this to check stack overflow! */
		61	/* With Flat model I do not think we can use 386 protection */
		62	/* to detect a stack overflow; anyway Watcom C use a standard */
		63	/* function __CHK to detect it! The compiler place it whenever */
		64	/* it calls a function to detect overflow */
		65
		66	DWORD _stkbase;
		67	DWORD _stktop;
		68
		69	/* This is some extra stuff we need to compile with argument */
		70	/* passing and math extensions */
		71	DWORD _argc = 0;
		72	typedef char *charp;
		73	charp _argv[100];
		74
		75	extern void main(int argc, char *argv[]);
		76	extern void bios_save(void);
		77	extern void bios_restore(void);
		78
		79	/* This is used in GNU-C to implement C++ constructors/destructors */
		80	/* See the lib sources for more details */
		81	void __main(int argc, char **argv)
		82	{
		83	}
		84
		85
		86	struct multiboot_info *mbi_address(void)
		87	{
		88	/* This is declared in [wc32/gnu]\x0.[asm/s] */
		89	extern struct multiboot_info *mbi;
		90
		91	return (mbi);
		92	}
		93
		94	#ifndef __NOH4__
		95
		96	void __kernel_init__(struct multiboot_info *m);
		97
		98	void _startup(void)
		99	{
		100	struct multiboot_info *mbi = mbi_address();
		101
		102	bios_save();
		103
		104	/* Call init procedure using standard C convention */
		105	/* Remember you cannot call any console I/O function */
		106	/* if you do not call bios_save() */
		107
		108	#ifdef __DUMP_MEM__
		109	message("X/MEM : %u\n", mbi->mem_upper);
		110	message("DOS/MEM : %u\n", mbi->mem_lower);
		111	message("x_bios Size : %u\n", sizeof(X_BIOSCALL));
		112	message("mbi Size : %u\n", sizeof(struct multiboot_info));
		113	message("Cmdline : %s\n", mbi->cmdline);
		114	/* message("Argc : %u",_argc);
		115	message("Argv[0] : %s / %s\n",_argv[0]);
		116	message("Argv[1] : %s\n",_argv[1]);
		117	message("Argv[2] : %s\n",_argv[2]);
		118	message("Argv[3] : %s\n",_argv[3]); */
		119	#endif
		120
		121	__kernel_init__(mbi);
		122
		123	bios_restore();
		124	}
		125
		126	#else
		127	void _startup(void)
		128	{
		129	register int i = 0;
		130	struct multiboot_info *mbi = mbi_address();
		131	char cmdline = (char ) (mbi->cmdline);
		132
		133	if (!(mbi->flags & MB_INFO_MEMORY)) {
		134	cputs
		135	("X/Runtime library error!!! Unable to find memory information!\n");
		136	l1_exit(-1);
		137	}
		138
		139	if (mbi->flags & MB_INFO_CMDLINE) {
		140	/* Build parameter list, up to 100 parms... */
		141	while (cmdline[i] != 0) {
		142	_argv[_argc] = &(cmdline[i]);
		143	while (cmdline[i] != ' ' && cmdline[i] != 0)
		144	i++;
		145	if (cmdline[i] == ' ') {
		146	cmdline[i] = 0;
		147	i++;
		148	_argc++;
		149	}
		150	}
		151	_argc++;
		152	}
		153
		154	bios_save();
		155	/* Call main procedure using standard C convention */
		156	/* Remember you cannot call any console I/O function */
		157	/* if you do not call bios_save() */
		158
		159	#ifdef __DUMP_MEM__
		160	message("X/MEM : %u\n", mbi->mem_upper);
		161	message("DOS/MEM : %u\n", mbi->mem_lower);
		162	message("x_bios Size : %u\n", sizeof(X_BIOSCALL));
		163	message("mbi Size : %u\n", sizeof(struct multiboot_info));
		164	message("Cmdline : %s\n", mbi->cmdline);
		165	message("Argc : %u", _argc);
		166	message("Argv[0] : %s / %s\n", _argv[0]);
		167	message("Argv[1] : %s\n", _argv[1]);
		168	message("Argv[2] : %s\n", _argv[2]);
		169	message("Argv[3] : %s\n", _argv[3]);
		170	#endif
		171	main(_argc, _argv);
		172	bios_restore();
		173	}
		174
		175	#endif

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