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#include <arch/mm/page.h>
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#include <arch/mm/page.h>
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#include <synch/spinlock.h>
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#include <synch/spinlock.h>
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#include <arch/types.h>
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#include <arch/types.h>
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#include <arch/asm.h>
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#include <arch/asm.h>
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#include <memstr.h>
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#include <memstr.h>
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#include <console/chardev.h>
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#include <console/console.h>
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/*
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/*
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 * The EGA driver.
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 * The EGA driver.
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 * Simple and short. Function for displaying characters and "scrolling".
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 * Simple and short. Function for displaying characters and "scrolling".
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 */
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 */
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static spinlock_t egalock;
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static spinlock_t egalock;
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static __u32 ega_cursor;
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static __u32 ega_cursor;
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static void ega_putchar(chardev_t *d, const char ch);
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chardev_t ega_console;
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static chardev_operations_t ega_ops = {
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    .write = ega_putchar
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};
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void ega_move_cursor(void);
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void ega_move_cursor(void);
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void ega_init(void)
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void ega_init(void)
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{
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{
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    __u8 hi, lo;
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    __u8 hi, lo;
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    outb(0x3d4,0xe);
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    outb(0x3d4,0xe);
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    hi = inb(0x3d5);
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    hi = inb(0x3d5);
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    outb(0x3d4,0xf);
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    outb(0x3d4,0xf);
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    lo = inb(0x3d5);
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    lo = inb(0x3d5);
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    ega_cursor = (hi<<8)|lo;
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    ega_cursor = (hi<<8)|lo;
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    chardev_initialize("ega_out", &ega_console, &ega_ops);
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    stdout = &ega_console;
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    ega_putchar('\n');
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    putchar('\n');
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}
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}
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static void ega_display_char(char ch)
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static void ega_display_char(char ch)
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{
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{
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    __u8 *vram = (__u8 *) PA2KA(VIDEORAM);
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    __u8 *vram = (__u8 *) PA2KA(VIDEORAM);
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    memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2);
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    memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2);
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    memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720);
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    memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720);
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    ega_cursor = ega_cursor - ROW;
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    ega_cursor = ega_cursor - ROW;
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}
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}
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void ega_putchar(const char ch)
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void ega_putchar(chardev_t *d, const char ch)
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{
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{
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    ipl_t ipl;
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    ipl_t ipl;
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    ipl = interrupts_disable();
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    ipl = interrupts_disable();
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    spinlock_lock(&egalock);
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    spinlock_lock(&egalock);
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    outb(0x3d4,0xe);
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    outb(0x3d4,0xe);
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    outb(0x3d5,(ega_cursor>>8)&0xff);
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    outb(0x3d5,(ega_cursor>>8)&0xff);
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    outb(0x3d4,0xf);
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    outb(0x3d4,0xf);
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    outb(0x3d5,ega_cursor&0xff);   
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    outb(0x3d5,ega_cursor&0xff);   
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}
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}
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void putchar(const char ch)
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{
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    ega_putchar(ch);
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}
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