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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.

 */

/*      As the name says... All the hardware-dependent data structures... */

#ifndef __LL_I386_HW_DATA_H__

#define __LL_I386_HW_DATA_H__

#include <ll/i386/defs.h>

BEGIN_DEF

/* DO WE NEED A SEPARATE INCL FILE FOR THIS? */

#if defined(__GNU__)

#define __LL_ARCH__ "32/DJGPP C/COFF"

#elif defined(__LINUX__)

#define __LL_ARCH__ "32/LINUX CrossCompiled/ELF"

#else

#error Architecture Undefined!

#endif

#include <ll/i386/sel.h>

/* Useful basic types */

#ifndef __BASIC_DATA__

    #define __BASIC_DATA__

    typedef void *LIN_ADDR;

    typedef unsigned long  DWORD;

    typedef unsigned short WORD;

    typedef unsigned char  BYTE;

    typedef unsigned long  TIME;

    typedef unsigned long  SYS_FLAGS;

    #define TRUE        1

    #define FALSE       0

    #define MAX_DWORD   0xFFFFFFFF

    #define MAX_WORD    0xFFFF

    #define MAX_BYTE    0xFF

    #define MAX_TIME    MAX_DWORD

#endif

typedef short CONTEXT;

/* Hardware based types (Self explanatory) */

typedef struct gate {

    WORD offset_lo __attribute__ ((packed));

    WORD sel __attribute__ ((packed));

    BYTE dword_cnt __attribute__ ((packed));

    BYTE access __attribute__ ((packed));

    WORD offset_hi __attribute__ ((packed));

} GATE;

typedef struct descriptor {

    WORD lim_lo __attribute__ ((packed));

    WORD base_lo __attribute__ ((packed));

    BYTE base_med __attribute__ ((packed));

    BYTE access __attribute__ ((packed));

    BYTE gran __attribute__ ((packed));

    BYTE base_hi __attribute__ ((packed));

} DESCRIPTOR;

/* A LDT/GDT entry could be a gate or a selector */

/* An IDT entry could be a gate only             */

union gdt_entry {

    DESCRIPTOR d __attribute__ ((packed));

    GATE g __attribute__ ((packed));

};

#define STACK_ACCESS    0x92    /* Basic Access bytes */

#define DATA_ACCESS     0x92

#define CODE_ACCESS     0x9A

/* At this level we just need to set up 2 gates to enter/exit PM */

/* The entry gate is a 386 32 bit call gate                      */

/* The exit (Back To Real Mode) gate is a 286 16 bit gate        */

#define CALL_GATE286    0x84    /* Call & Int Gate Access bytes */

#define CALL_GATE386    0x8C    

#define TASK_GATE       0x85

#define INT_GATE286     0x86

#define INT_GATE386     0x8E

#define TRAP_GATE286    0x87

#define TRAP_GATE386    0x8F

/* TSS selectors */

#define FREE_TSS386     0x89

#define BUSY_TSS386     0x8B

#define FREE_TSS286     0x81

#define BUSY_TSS286     0x83

#define GRAN_32B        0xC0    /* Granularity settings */

#define GRAN_32         0x40

#define GRAN_16         0x00

/* This is the TSS image for a 386 hardware task                        */

/* I added two other fields to the basic structure:                     */

/* 1) The CONTROL field which is used by system software to detect      */

/*    particular conditions; in this the first phase it is mainly used  */

/*    to mark the unused TSS & TSS which use math, altough thanks to    */

/*    the automatic FPU preemption supported in 386 this would be not   */

/*    necessary.                                                        */

/* 2) The ctx_FPU field used to store the FPU context if necessaary     */

#define TSS_USED                0x8000

#define FPU_USED                0x4000

#define FPU_CONTEXT_SIZE        108

/* CPU flags definitions */

#define CPU_FLAG_TF     0x00000100

#define CPU_FLAG_IF     0x00000200

#define CPU_FLAG_IOPL   0x00003000

#define CPU_FLAG_NT     0x00004000

#define CPU_FLAG_VM     0x00020000

#define CPU_FLAG_AC     0x00040000

#define CPU_FLAG_VIF    0x00080000

#define CPU_FLAG_VIP    0x00100000

#define CPU_FLAG_ID     0x00200000

typedef struct tss {

    WORD back_link __attribute__ ((packed));

    WORD _fill0 __attribute__ ((packed));

    DWORD esp0 __attribute__ ((packed));

    WORD ss0 __attribute__ ((packed));

    WORD _fill1 __attribute__ ((packed));

    DWORD esp1 __attribute__ ((packed));

    WORD ss1 __attribute__ ((packed));

    WORD _fill2 __attribute__ ((packed));

    DWORD esp2 __attribute__ ((packed));

    WORD ss2 __attribute__ ((packed));

    WORD _fill3 __attribute__ ((packed));

    DWORD cr3 __attribute__ ((packed));

    DWORD eip __attribute__ ((packed));

    DWORD eflags __attribute__ ((packed));

    DWORD eax __attribute__ ((packed));

    DWORD ecx __attribute__ ((packed));

    DWORD edx __attribute__ ((packed));

    DWORD ebx __attribute__ ((packed));

    DWORD esp __attribute__ ((packed));

    DWORD ebp __attribute__ ((packed));

    DWORD esi __attribute__ ((packed));

    DWORD edi __attribute__ ((packed));

    WORD es __attribute__ ((packed));

    WORD _fill5 __attribute__ ((packed));

    WORD cs __attribute__ ((packed));

    WORD _fill6 __attribute__ ((packed));

    WORD ss __attribute__ ((packed));

    WORD _fill7 __attribute__ ((packed));

    WORD ds __attribute__ ((packed));

    WORD _fill8 __attribute__ ((packed));

    WORD fs __attribute__ ((packed));

    WORD _fill9 __attribute__ ((packed));

    WORD gs __attribute__ ((packed));

    WORD _fill10 __attribute__ ((packed));

    WORD ldt __attribute__ ((packed));

    WORD _fill11 __attribute__ ((packed));

    WORD trap __attribute__ ((packed));

    WORD io_base __attribute__ ((packed));

    DWORD control __attribute__ ((packed));

    BYTE ctx_FPU[FPU_CONTEXT_SIZE] __attribute__ ((packed));

} TSS;

/* Irq services specifications */

#define TIMER_IRQ       0

#define KEYB_IRQ        1

#define COM2_IRQ        3

#define COM1_IRQ        4

#define COM4_IRQ        3

#define COM3_IRQ        4

#define SB_IRQ          5

#define FDC_IRQ         6

#define SB2_IRQ         7

#define RTC_IRQ         8

#define PS2MOUSE_IRQ    12

#define COPROC_IRQ      13

#define IDE0_IRQ        14

#define IDE1_IRQ        15

typedef void (*INTERRUPT)(void);

/* Any Kernel primitive is declared with the SYSCALL() modifier         */

/* This is useful to add special purposes meaning to the function       */

/* defclaration                                                         */

#define SYSCALL(x)      x

END_DEF

#endif