82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
#pragma once
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#include <stdint.h>
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// Labels of v8086 programs
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// TODO Remove these and use
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// a single define for location?
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extern void v86Test();
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extern void v86TransFlag();
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extern void v86Interrupt();
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extern void v86TextMode();
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extern void v86DiskOp();
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extern void v86DiskGetGeometry();
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extern void v86DiskReadCHS();
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union __attribute((__packed__)) V86Regs_t {
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struct dword_regs {
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uint32_t edi;
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uint32_t esi;
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uint32_t ebx;
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uint32_t edx;
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uint32_t ecx;
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uint32_t eax;
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} d;
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struct word_regs {
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uint16_t di, _upper_di;
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uint16_t si, _upper_si;
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uint16_t bx, _upper_bx;
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uint16_t dx, _upper_dx;
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uint16_t cx, _upper_cx;
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uint16_t ax, _upper_ax;
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} w;
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struct byte_regs {
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uint16_t di, _upper_di;
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uint16_t si, _upper_si;
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uint8_t bl, bh;
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uint16_t _upper_bx;
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uint8_t dl, dh;
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uint16_t _upper_dx;
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uint8_t cl, ch;
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uint16_t _upper_cx;
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uint8_t al, ah;
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uint16_t _upper_ax;
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} h;
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};
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extern uint32_t enter_v86(uint32_t ss, uint32_t esp, uint32_t cs, uint32_t eip, union V86Regs_t *regs);
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void V8086Int(uint8_t interrupt, union V86Regs_t *regs);
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struct __attribute((__packed__)) Int13DiskPacket_t {
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uint8_t size; // 0x10
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uint8_t reserved; // 0x00
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uint16_t blocks;
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uint32_t transfer_buffer; // 0x2300:0000
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uint64_t start_block;
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};
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extern struct Int13DiskPacket_t v86disk_addr_packet;
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/* Real Mode helper macros */
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/* segment:offset pair */
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typedef uint32_t FARPTR;
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/* Make a FARPTR from a segment and an offset */
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#define MK_FP(seg, off) ((FARPTR) (((uint32_t) (seg) << 16) | (uint16_t) (off)))
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/* Extract the segment part of a FARPTR */
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#define FP_SEG(fp) (((FARPTR) fp) >> 16)
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/* Extract the offset part of a FARPTR */
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#define FP_OFF(fp) (((FARPTR) fp) & 0xffff)
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/* Convert a segment:offset pair to a linear address */
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#define FP_TO_LINEAR(seg, off) ((void*)(uintptr_t)((((uint32_t)seg) << 4) + ((uint32_t)off)))
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#define EFLAG_IF ((uint32_t)1 << 9)
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#define EFLAG_VM ((uint32_t)1 << 17)
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FARPTR i386LinearToFp(void *ptr);
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void ensure_v86env();
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