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/* Project:     OSLib
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 * Description: The OS Construction Kit
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 * Date:                1.6.2000
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 * Idea by:             Luca Abeni & Gerardo Lamastra
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 *
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 * OSLib is an SO project aimed at developing a common, easy-to-use
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 * low-level infrastructure for developing OS kernels and Embedded
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 * Applications; it partially derives from the HARTIK project but it
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 * currently is independently developed.
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 *
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 * OSLib is distributed under GPL License, and some of its code has
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 * been derived from the Linux kernel source; also some important
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 * ideas come from studying the DJGPP go32 extender.
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 *
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 * We acknowledge the Linux Community, Free Software Foundation,
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 * D.J. Delorie and all the other developers who believe in the
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 * freedom of software and ideas.
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 *
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 * For legalese, check out the included GPL license.
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 */
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/*      As the name says... All the hardware-dependent data structures... */
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#ifndef __LL_I386_HW_DATA_H__
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#define __LL_I386_HW_DATA_H__
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#include <ll/i386/defs.h>
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BEGIN_DEF
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/* DO WE NEED A SEPARATE INCL FILE FOR THIS? */
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#if defined(__GNU__)
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#define __LL_ARCH__ "32/DJGPP C/COFF"
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#elif defined(__LINUX__)
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#define __LL_ARCH__ "32/LINUX CrossCompiled/ELF"
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#else
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#error Architecture Undefined!
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#endif
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#include <ll/i386/sel.h>
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/* Useful basic types */
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#ifndef __BASIC_DATA__
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    #define __BASIC_DATA__
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    typedef void *LIN_ADDR;
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    typedef unsigned long long  QWORD;
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    typedef unsigned long  DWORD;
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    typedef unsigned short WORD;
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    typedef unsigned char  BYTE;
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    typedef unsigned long  TIME;
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    typedef unsigned long  SYS_FLAGS;
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    #define TRUE        1
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    #define FALSE       0
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    #define MAX_DWORD   0xFFFFFFFF
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    #define MAX_WORD    0xFFFF
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    #define MAX_BYTE    0xFF
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    #define MAX_TIME    MAX_DWORD
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#endif
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typedef short CONTEXT;
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/* Hardware based types (Self explanatory) */
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typedef struct gate {
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    WORD offset_lo __attribute__ ((packed));
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    WORD sel __attribute__ ((packed));
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    BYTE dword_cnt __attribute__ ((packed));
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    BYTE access __attribute__ ((packed));
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    WORD offset_hi __attribute__ ((packed));
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} GATE;
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typedef struct descriptor {
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    WORD lim_lo __attribute__ ((packed));
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    WORD base_lo __attribute__ ((packed));
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    BYTE base_med __attribute__ ((packed));
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    BYTE access __attribute__ ((packed));
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    BYTE gran __attribute__ ((packed));
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    BYTE base_hi __attribute__ ((packed));
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} DESCRIPTOR;
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/* A LDT/GDT entry could be a gate or a selector */
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/* An IDT entry could be a gate only             */
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union gdt_entry {
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    DESCRIPTOR d __attribute__ ((packed));
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    GATE g __attribute__ ((packed));
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};
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struct registers {
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    DWORD dummy1;
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    DWORD dummy2;
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    DWORD egs;
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    DWORD efs;
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    DWORD ees;
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    DWORD ess;
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    DWORD eds;
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    DWORD edi;
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    DWORD esi;
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    DWORD ebp;
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    DWORD esp;
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    DWORD ebx;
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    DWORD edx;
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    DWORD ecx;
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    DWORD eax;
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    DWORD eip;
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    DWORD ecs;
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    DWORD flags;
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};
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#define STACK_ACCESS    0x92    /* Basic Access bytes */
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#define DATA_ACCESS     0x92
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#define CODE_ACCESS     0x9A
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/* At this level we just need to set up 2 gates to enter/exit PM */
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/* The entry gate is a 386 32 bit call gate                      */
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/* The exit (Back To Real Mode) gate is a 286 16 bit gate        */
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#define CALL_GATE286    0x84    /* Call & Int Gate Access bytes */
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#define CALL_GATE386    0x8C    
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#define TASK_GATE       0x85
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#define INT_GATE286     0x86
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#define INT_GATE386     0x8E
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#define TRAP_GATE286    0x87
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#define TRAP_GATE386    0x8F
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/* TSS selectors */
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#define FREE_TSS386     0x89
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#define BUSY_TSS386     0x8B
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#define FREE_TSS286     0x81
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#define BUSY_TSS286     0x83
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#define GRAN_32B        0xC0    /* Granularity settings */
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#define GRAN_32         0x40
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#define GRAN_16         0x00
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/* This is the TSS image for a 386 hardware task                        */
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/* I added two other fields to the basic structure:                     */
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/* 1) The CONTROL field which is used by system software to detect      */
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/*    particular conditions; in this the first phase it is mainly used  */
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/*    to mark the unused TSS & TSS which use math, altough thanks to    */
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/*    the automatic FPU preemption supported in 386 this would be not   */
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/*    necessary.                                                        */
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/* 2) The ctx_FPU field used to store the FPU context if necessaary     */
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#define TSS_USED                0x8000
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#define FPU_USED                0x4000
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#define FPU_CONTEXT_SIZE        108
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/* CPU flags definitions */
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#define CPU_FLAG_TF     0x00000100
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#define CPU_FLAG_IF     0x00000200
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#define CPU_FLAG_IOPL   0x00003000
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#define CPU_FLAG_NT     0x00004000
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#define CPU_FLAG_VM     0x00020000
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#define CPU_FLAG_AC     0x00040000
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#define CPU_FLAG_VIF    0x00080000
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#define CPU_FLAG_VIP    0x00100000
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#define CPU_FLAG_ID     0x00200000
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typedef struct tss {
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    WORD back_link __attribute__ ((packed));
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    WORD _fill0 __attribute__ ((packed));
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    DWORD esp0 __attribute__ ((packed));
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    WORD ss0 __attribute__ ((packed));
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    WORD _fill1 __attribute__ ((packed));
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    DWORD esp1 __attribute__ ((packed));
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    WORD ss1 __attribute__ ((packed));
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    WORD _fill2 __attribute__ ((packed));
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    DWORD esp2 __attribute__ ((packed));
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    WORD ss2 __attribute__ ((packed));
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    WORD _fill3 __attribute__ ((packed));
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    DWORD cr3 __attribute__ ((packed));
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    DWORD eip __attribute__ ((packed));
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    DWORD eflags __attribute__ ((packed));
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    DWORD eax __attribute__ ((packed));
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    DWORD ecx __attribute__ ((packed));
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    DWORD edx __attribute__ ((packed));
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    DWORD ebx __attribute__ ((packed));
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    DWORD esp __attribute__ ((packed));
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    DWORD ebp __attribute__ ((packed));
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    DWORD esi __attribute__ ((packed));
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    DWORD edi __attribute__ ((packed));
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    WORD es __attribute__ ((packed));
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    WORD _fill5 __attribute__ ((packed));
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    WORD cs __attribute__ ((packed));
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    WORD _fill6 __attribute__ ((packed));
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    WORD ss __attribute__ ((packed));
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    WORD _fill7 __attribute__ ((packed));
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    WORD ds __attribute__ ((packed));
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    WORD _fill8 __attribute__ ((packed));
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    WORD fs __attribute__ ((packed));
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    WORD _fill9 __attribute__ ((packed));
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    WORD gs __attribute__ ((packed));
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    WORD _fill10 __attribute__ ((packed));
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    WORD ldt __attribute__ ((packed));
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    WORD _fill11 __attribute__ ((packed));
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    WORD trap __attribute__ ((packed));
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    WORD io_base __attribute__ ((packed));
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    DWORD control __attribute__ ((packed));
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    BYTE ctx_FPU[FPU_CONTEXT_SIZE] __attribute__ ((packed));
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} TSS;
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/* Irq services specifications */
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#define TIMER_IRQ       0
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#define KEYB_IRQ        1
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#define COM2_IRQ        3
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#define COM1_IRQ        4
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#define COM4_IRQ        3
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#define COM3_IRQ        4
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#define SB_IRQ          5
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#define FDC_IRQ         6
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#define SB2_IRQ         7
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#define RTC_IRQ         8
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#define PS2MOUSE_IRQ    12
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#define COPROC_IRQ      13
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#define IDE0_IRQ        14
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#define IDE1_IRQ        15
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typedef void (*INTERRUPT)(void);
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/* Any Kernel primitive is declared with the SYSCALL() modifier         */
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/* This is useful to add special purposes meaning to the function       */
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/* defclaration                                                         */
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#define SYSCALL(x)      x
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END_DEF
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#endif