49 lines
760 B
C
49 lines
760 B
C
// IO Port Access Type Purpose
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// 0x60 Read/Write Data Port
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// 0x64 Read Status Register
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// 0x64 Write Command Register
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enum{
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CON_PC,
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CON_SRI,
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CON_END,
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};
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struct BIOSreg{
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u32 ax;
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u32 cx;
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u32 dx;
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u32 bx;
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u32 bp;
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u32 si;
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u32 di;
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u32 ds;
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u32 es;
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}__attribute__((packed));
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typedef struct{
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char *name;
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void (**probes)(void);
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uint cnt;
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}BootProbe;
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typedef struct ConDev ConDev;
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struct ConDev{
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int (*probe)(ConDev*);
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void (*init)(ConDev *);
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int (*getc)(int);
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void (*putc)(int, int);
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uint dev;
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uchar pri; // the higher the better
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};
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// gdt.S
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extern volatile struct BIOSreg BIOSreg;
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// boot.c
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extern void (*probe1[])(void);
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extern void (*probe2[])(void);
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extern BootProbe probes[];
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extern ConDev contab[CON_END];
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extern ConDev *con;
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