kernel/arch/i386/include/io.h

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #ifndef _X86_H
  21 #define _X86_H
  22
  23 #include <system.h>
  24 #include <build.h>
  25
  26 #define M_PIC  0x20     /* I/O for master PIC              */
  27 #define M_IMR  0x21     /* I/O for master IMR              */
  28 #define S_PIC  0xA0     /* I/O for slave PIC               */
  29 #define S_IMR  0xA1     /* I/O for slace IMR               */
  30
  31 #define EOI    0x20     /* EOI command                     */
  32
  33 #define ICW1   0x11     /* Cascade, Edge triggered         */
  34                         /* ICW2 is vector                  */
  35                         /* ICW3 is slave bitmap or number  */
  36 #define ICW4   0x01     /* 8088 mode                       */
  37
  38 #define M_VEC  0x68     /* Vector for master               */
  39 #define S_VEC  0x70     /* Vector for slave                */
  40
  41 #define OCW3_IRR  0x0A  /* Read IRR                        */
  42 #define OCW3_ISR  0x0B  /* Read ISR                        */
  43
  44
  45 #ifdef ARCH_i386
  46
  47 #define inw(port) ({ \
  48 unsigned short _v; \
  49 __asm__ volatile ("inw %%dx, %%ax":"=a" (_v):"dN" (port)); \
  50 _v; \
  51 })
  52
  53 /*#define outw(value, port) \
  54 __asm__ ("outw %%ax, %%dx"::"a" (value),"dN" (port))*/
  55
  56 #define outb_p(value, port) \
  57 __asm__ ("outb %%al, %%dx\n" \
  58                 "\tjmp 1f\n" \
  59                 "1:\tjmp 1f\n" \
  60                 "1:"::"a" (value),"d" (port))
  61
  62 #define outw_p(value,port) \
  63 __asm__ ("outw %%ax,%%dx\n" \
  64                 "\tjmp 1f\n" \
  65                 "1:\tjmp 1f\n" \
  66                 "1:"::"a" (value),"dN" (port))
  67
  68 #define inb_p(port) ({ \
  69 unsigned char _v; \
  70 __asm__ volatile ("inb %%dx,%%al\n" \
  71         "\tjmp 1f\n" \
  72         "1:\tjmp 1f\n" \
  73         "1:":"=a" (_v):"d" (port)); \
  74 _v; \
  75 })
  76
  77
  78 /* This defines what the stack looks like after an ISR was running */
  79 struct regs
  80 {
  81         unsigned int ds, es, fs, gs;
  82         unsigned int edi, esi, ebp, esp, ebx, edx, ecx, eax;
  83         unsigned int int_no, err_code;
  84         unsigned int eip, cs, eflags, useresp, ss;
  85 };
  86
  87 /* registers pushed on the stack by exceptions or interrupts that
  88 switch from user privilege to kernel privilege
  89         *** WARNING ***
  90 The layout of this struct must agree with the order in which
  91 registers are pushed and popped in the assembly-language
  92 interrupt handler code. */
  93 typedef struct
  94 {
  95         unsigned edi, esi, ebp, esp, ebx, edx, ecx, eax; /* PUSHA/POP */
  96         unsigned ds, es, fs, gs;
  97         unsigned which_int, err_code;
  98         unsigned eip, cs, eflags, user_esp, user_ss; /* INT nn/IRET */
  99         unsigned v_es, v_ds, v_fs, v_gs; /* V86 mode only */
 100 } uregs_t;
 101
 102 #define _set_gate(gate_addr, type, dpl, addr) \
 103 __asm__ ("movw %%dx,%%ax\n\t" \
 104         "movw %0,%%dx\n\t" \
 105         "movl %%eax,%1\n\t" \
 106         "movl %%edx,%2" \
 107         : \
 108         : "i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
 109         "o" (*((char *) (gate_addr))), \
 110         "o" (*(4+(char *) (gate_addr))), \
 111         "d" ((char *) (addr)),"a" (0x00080000))
 112
 113 void dma_xfer (unsigned char channel, unsigned long address, unsigned int length, unsigned char read);
 114
 115 void enable_irq (unsigned short irq_num);
 116 void disable_irq (unsigned short irq_num);
 117
 118 extern void outb (unsigned port, unsigned val);
 119
 120 extern void init_v86_regs(uregs_t *regs);
 121 extern void do_v86_int(uregs_t *regs, unsigned int_num);
 122
 123 /* gtd.c */
 124 extern void gdt_set_gate (int num, unsigned long base, unsigned long limit, unsigned char access, unsigned char gran);
 125 extern unsigned int gdt_install ();
 126
 127 /* idt.c */
 128 extern void idt_set_gate (unsigned char num, unsigned long base, unsigned short sel, unsigned char flags);
 129 extern unsigned int idt_install ();
 130
 131 /* isrs.c */
 132 extern unsigned int isrs_install ();
 133
 134 /* irq.c */
 135 extern void irq_install_handler (int irq, void (*handler)(struct regs *r));
 136 extern void irq_uninstall_handler (int irq);
 137 extern unsigned int irq_install ();
 138
 139 /* timer.c */
 140 extern void timer_wait (int ticks);
 141 extern unsigned int timer_install ();
 142
 143 #endif
 144
 145 #endif
 146