1 | #ifndef ROMBIOS_COMPAT |
---|
2 | #define ROMBIOS_COMPAT |
---|
3 | |
---|
4 | /* |
---|
5 | * Compatibility functions and structures for transitioning between |
---|
6 | * 16 bit Bochs BIOS and 32 bit BIOS code. |
---|
7 | */ |
---|
8 | #include <stdint.h> |
---|
9 | |
---|
10 | #define ADDR_FROM_SEG_OFF(seg, off) (void *)((((uint32_t)(seg)) << 4) + (off)) |
---|
11 | |
---|
12 | typedef uint8_t Bit8u; |
---|
13 | typedef uint16_t Bit16u; |
---|
14 | typedef uint32_t Bit32u; |
---|
15 | |
---|
16 | #define SetCF(x) (x)->u.r8.flagsl |= 0x01 |
---|
17 | #define SetZF(x) (x)->u.r8.flagsl |= 0x40 |
---|
18 | #define ClearCF(x) (x)->u.r8.flagsl &= 0xfe |
---|
19 | #define ClearZF(x) (x)->u.r8.flagsl &= 0xbf |
---|
20 | #define GetCF(x) ((x)->u.r8.flagsl & 0x01) |
---|
21 | |
---|
22 | #define SET_CF() *FLAGS |= 0x0001 |
---|
23 | #define CLEAR_CF() *FLAGS &= 0xfffe |
---|
24 | #define GET_CF() (*FLAGS & 0x0001) |
---|
25 | |
---|
26 | #define SET_ZF() *FLAGS |= 0x0040 |
---|
27 | #define CLEAR_ZF() *FLAGS &= 0xffbf |
---|
28 | |
---|
29 | |
---|
30 | typedef struct { |
---|
31 | union { |
---|
32 | struct { |
---|
33 | Bit32u edi, esi, ebp, esp; |
---|
34 | Bit32u ebx, edx, ecx, eax; |
---|
35 | } r32; |
---|
36 | struct { |
---|
37 | Bit16u di, filler1, si, filler2, bp, filler3, sp, filler4; |
---|
38 | Bit16u bx, filler5, dx, filler6, cx, filler7, ax, filler8; |
---|
39 | } r16; |
---|
40 | struct { |
---|
41 | Bit32u filler[4]; |
---|
42 | Bit8u bl, bh; |
---|
43 | Bit16u filler1; |
---|
44 | Bit8u dl, dh; |
---|
45 | Bit16u filler2; |
---|
46 | Bit8u cl, ch; |
---|
47 | Bit16u filler3; |
---|
48 | Bit8u al, ah; |
---|
49 | Bit16u filler4; |
---|
50 | } r8; |
---|
51 | } u; |
---|
52 | } __attribute__((packed)) pushad_regs_t; |
---|
53 | |
---|
54 | |
---|
55 | |
---|
56 | static inline Bit32u read_dword(Bit16u seg, Bit16u off) |
---|
57 | { |
---|
58 | uint32_t *addr = (uint32_t *)ADDR_FROM_SEG_OFF(seg,off); |
---|
59 | return *addr; |
---|
60 | } |
---|
61 | |
---|
62 | static inline Bit16u read_word(Bit16u seg, Bit16u off) |
---|
63 | { |
---|
64 | uint16_t *addr = (uint16_t *)ADDR_FROM_SEG_OFF(seg,off); |
---|
65 | return *addr; |
---|
66 | } |
---|
67 | |
---|
68 | static inline Bit8u read_byte(Bit16u seg, Bit16u off) |
---|
69 | { |
---|
70 | uint8_t *addr = (uint8_t *)ADDR_FROM_SEG_OFF(seg,off); |
---|
71 | return *addr; |
---|
72 | } |
---|
73 | |
---|
74 | static inline void write_dword(Bit16u seg, Bit16u off, Bit32u val) |
---|
75 | { |
---|
76 | uint32_t *addr = (uint32_t *)ADDR_FROM_SEG_OFF(seg,off); |
---|
77 | *addr = val; |
---|
78 | } |
---|
79 | |
---|
80 | static inline void write_word(Bit16u seg, Bit16u off, Bit16u val) |
---|
81 | { |
---|
82 | uint16_t *addr = (uint16_t *)ADDR_FROM_SEG_OFF(seg,off); |
---|
83 | *addr = val; |
---|
84 | } |
---|
85 | |
---|
86 | static inline void write_byte(Bit16u seg, Bit16u off, Bit8u val) |
---|
87 | { |
---|
88 | uint8_t *addr = (uint8_t *)ADDR_FROM_SEG_OFF(seg,off); |
---|
89 | *addr = val; |
---|
90 | } |
---|
91 | |
---|
92 | #endif |
---|