57 lines
825 B
C
57 lines
825 B
C
typedef int dev_t;
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#define SCREEN_WIDTH 80
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#define SCREEN_LENGTH 25
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#define VGA_BUFFER_ADDR 0xb8000
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char*
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memcpy(char *a, char *b, int l)
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{
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for(int i = 0; i < l; ++i)
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a[i] = b[i];
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return a;
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}
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int
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strlen(char *s)
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{
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int i = 0;
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for(; s[i]; ++i)
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;
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return i;
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}
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char*
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itostr(int n, char *s)
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{
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char buf[16];
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char *p = buf;
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do {
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*p++ = n%16;
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}while((n/=16) != 0);
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while(p > buf){
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*s++ = "0123456789abcdef"[(int)*--p];
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}
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return s;
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}
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void
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boot(dev_t bootdev)
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{
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char *p;
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char s[SCREEN_WIDTH] = "booted on disk:0x";
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short* vga = (short*)VGA_BUFFER_ADDR;
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p = s+strlen(s);
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p = itostr((int)bootdev, p);
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for(int j = 0; j < SCREEN_LENGTH; ++j){
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for (int i = 0; i < sizeof(s); ++i) {
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vga[(j*SCREEN_WIDTH) + (i + SCREEN_WIDTH*2)] = 0x9100 | s[i];
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}
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}
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while(1)
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;
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}
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