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/* Project: OSLib
* Description: The OS Construction Kit
* Date: 1.6.2000
* Idea by: Luca Abeni & Gerardo Lamastra
*
* OSLib is an SO project aimed at developing a common, easy-to-use
* low-level infrastructure for developing OS kernels and Embedded
* Applications; it partially derives from the HARTIK project but it
* currently is independently developed.
*
* OSLib is distributed under GPL License, and some of its code has
* been derived from the Linux kernel source; also some important
* ideas come from studying the DJGPP go32 extender.
*
* We acknowledge the Linux Community, Free Software Foundation,
* D.J. Delorie and all the other developers who believe in the
* freedom of software and ideas.
*
* For legalese, check out the included GPL license.
*/
/* KL initialization code */
#include <ll/i386/stdlib.h>
#include <ll/i386/x-bios.h>
#include <ll/i386/mem.h>
#include <ll/i386/cons.h>
#include <ll/i386/mb-info.h>
#include <ll/i386/error.h>
#include <ll/i386/pit.h>
#include <ll/i386/pic.h>
#include <ll/i386/advtimer.h>
#include <ll/i386/tss-ctx.h>
#include <ll/i386/hw-arch.h>
#include <ll/sys/ll/ll-func.h>
#include <ll/sys/ll/ll-mem.h>
#include <ll/sys/ll/ll-instr.h>
#include <ll/sys/ll/event.h> /* for irq_bind() & irq_init() */
#include <ll/sys/ll/exc.h> /* These are the HW exceptions */
FILE
(LL
-Init
);
/* These are declared in llCx32b.C */
TSS TSS_table
[TSSMax
];
WORD TSS_control
[TSSMax
];
BYTE ll_FPU_stdctx
[FPU_CONTEXT_SIZE
];
void debug_info
(void) {
static DWORD fault_ip
;
static DWORD fault_cs
;
static DWORD error_code
;
static DWORD fault_eflag
;
static DWORD sp
;
static DWORD fault_sp
;
static DWORD data0
;
static DWORD data1
;
static DWORD data2
;
static DWORD sdata4
;
static DWORD sdata8
;
asm
(" movl %%esp,%0\n\t":"=r"(sp
));
asm
(" movl -8(%%ebp),%0\n\t":"=r"(sdata8
));
asm
(" movl -4(%%ebp),%0\n\t":"=r"(sdata4
));
asm
(" movl 0(%%ebp),%0\n\t":"=r"(data0
));
asm
(" movl 4(%%ebp),%0\n\t":"=r"(error_code
));
asm
(" movl 8(%%ebp),%0\n\t":"=r"(fault_ip
));
asm
(" movl 12(%%ebp),%0\n\t":"=r"(fault_cs
));
asm
(" movl 16(%%ebp),%0\n\t":"=r"(fault_eflag
));
asm
(" movl 20(%%ebp),%0\n\t":"=r"(fault_sp
));
asm
(" movl 24(%%ebp),%0\n\t":"=r"(data1
));
message
(":F -8: %lx:", sdata8
);
message
(":F -4: %lx:", sdata4
);
message
(":F 0: %lx:", data0
);
message
(":F ec/4: %lx:", error_code
);
message
(":F ip/8: %lx:", fault_ip
);
message
(":F cs/12 : %lx:", fault_cs
);
message
(":F eflag/16 : %lx:", fault_eflag
);
message
(":F sp/20 : %lx:", fault_sp
);
message
(":F 24 : %lx:", data1
);
}
void ll_exc_hook
(int i
)
{
static char *exc_mess
[] = {
"#Division by 0",
"#Debug fault",
"#NMI detected",
"#Breakpoint trap",
"#Overflow detected on INTO",
"#BOUND limit exceeded",
"*Unvalid opcode",
"1FPU context switch", /* Handled in the llCtx.Asm/S File */
"*Double defect",
"#INTEL reserved",
"*Unvalid TSS",
"*Segment not present",
"*Stack exception",
"*General protection fault",
"#Page fault",
"#INTEL reserved",
"2Coprocessor error"
};
static int exc_code
[] = {
DIV_BY_0
, NMI_EXC
, DEBUG_EXC
, BREAKPOINT_EXC
,
HW_FAULT
, HW_FAULT
, HW_FAULT
,
0, /* This is the FPU ctx Switch */
HW_FAULT
, HW_FAULT
, HW_FAULT
, HW_FAULT
,
HW_FAULT
, HW_FAULT
, HW_FAULT
, HW_FAULT
,
MATH_EXC
};
char code
= *exc_mess
[i
];
#ifdef __LL_DEBUG__
extern long int ndp_called
,ndp_switched
;
extern wu_called
;
extern ai_called
;
extern DWORD
*smain
;
#endif
/* Math error! FPU has to be acknowledgded */
if (code
== '2') ll_out
(0x0F0,0);
message
("Exception %d occurred\n", i
);
message
("%s\n", &exc_mess
[i
][1]);
#ifdef __LL_DEBUG__
if (code
== '*') {
/* Dump additional info */
message
("DS:%nx CS:%nx\n",get_DS
(),get_CS
());
/* message("WU : %d AI : %d\n",wu_called,ai_called); */
message
("Actual stack : %x\n",get_SP
());
/* message("Main stack : %p\n",smain); */
dump_TSS
(get_TR
());
}
#endif
/* halt(); */
message
("Actual stack : %x\n",get_SP
());
dump_TSS
(get_TR
());
ll_abort
(exc_code
[i
]);
}
void *ll_init
(void)
{
void *p
;
int i
;
LIN_ADDR b
;
/*
DWORD s;
BYTE *base;
*/
TSS dummy_tss
; /* Very dirty, but we need it, in order to
get an initial value for the FPU
context...
*/
p
= l1_init
();
/* First of all, init the exc and irq tables... */
irq_init
();
for(i
= 0; i
< 32; i
++) {
/* Warning!!! The hw exceptions should be 32.... Fix it!!! */
/*
ll_irq_table[i] = (DWORD)act_int;
ll_exc_table[i] = (DWORD)ll_exc_hook;
*/
l1_exc_bind
(i
, ll_exc_hook
);
}
for(i
= 0; i
< 16; i
++) {
void act_int
(int i
);
l1_irq_bind
(i
, act_int
);
}
/* Init TSS table & put the corrispondent selectors into GDT */
TSS_control
[TSSMain
] |= TSS_USED
;
for (i
= 0; i
< TSSMax
; i
++) {
/* b = appl2linear(&TSS_table[i]); */
b
= (LIN_ADDR
)(&TSS_table
[i
]);
GDT_place
(TSSindex2sel
(i
),(DWORD
)b
,sizeof(TSS
),FREE_TSS386
, GRAN_16
);
}
#if 0
ll_FPU_save
();
memcpy(ll_FPU_stdctx
,ll_FPU_savearea
,FPU_CONTEXT_SIZE
);
#else
save_fpu
(&dummy_tss
); /* OK???*/
memcpy(ll_FPU_stdctx
, dummy_tss.
ctx_FPU, FPU_CONTEXT_SIZE
);
#endif
init_fpu
();
/* ll_mem_init must be explicitelly called by program... */
#if 0
/* Get info about extended memory! We suppose that X has loaded */
/* there the application; if you switch to DOS memory, then you */
/* have to change the stuff in order it works; check X_... for */
/* details. */
X_meminfo
(&b
,&s
,NULL
,NULL
);
base
= (BYTE
*)b
;
#ifdef __MEM_DEBUG__
message
("PM Free Mem Base : %lx\n",b
);
message
("PM null addr (0L) : %lx\n",appl2linear
((void *)0L));
message
("PM Free Mem Base (Cnvrtd): %lp\n",base
);
#endif
ll_mem_init
(base
,s
);
#ifdef __MEM_DEBUG__
ll_mem_dump
();
#endif
#endif
return p
;
}
void abort_tail
(int code
)
{
message
("ABORT %d !!!",code
);
ll_restore_adv
();
l1_end
();
sti
();
l1_exit
(1);
}
void ll_end
(void)
{
ll_restore_adv
();
l1_end
();
}