rayzor
annotate src/dpmi.c @ 14:a9a948809c6f
starting the renderer screen, plus misc stuff
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sun, 13 Apr 2014 08:06:21 +0300 |
| parents | |
| children |
| rev | line source |
|---|---|
| nuclear@0 | 1 #include "dpmi.h" |
| nuclear@0 | 2 |
| nuclear@0 | 3 void dpmi_real_int(int inum, struct dpmi_real_regs *regs) |
| nuclear@0 | 4 { |
| nuclear@0 | 5 unsigned char int_num = (unsigned char)inum; |
| nuclear@0 | 6 __asm { |
| nuclear@0 | 7 mov eax, 0x300 |
| nuclear@0 | 8 mov edi, regs |
| nuclear@0 | 9 mov bl, int_num |
| nuclear@0 | 10 mov bh, 0 |
| nuclear@0 | 11 xor ecx, ecx |
| nuclear@0 | 12 int 0x31 |
| nuclear@0 | 13 } |
| nuclear@0 | 14 } |
| nuclear@0 | 15 |
| nuclear@0 | 16 void *dpmi_mmap(uint32_t phys_addr, unsigned int size) |
| nuclear@0 | 17 { |
| nuclear@0 | 18 uint16_t mem_high, mem_low; |
| nuclear@0 | 19 uint16_t phys_high = phys_addr >> 16; |
| nuclear@0 | 20 uint16_t phys_low = phys_addr & 0xffff; |
| nuclear@0 | 21 uint16_t size_high = size >> 16; |
| nuclear@0 | 22 uint16_t size_low = size & 0xffff; |
| nuclear@0 | 23 unsigned int err, res = 0; |
| nuclear@0 | 24 |
| nuclear@0 | 25 __asm { |
| nuclear@0 | 26 mov eax, 0x800 |
| nuclear@0 | 27 mov bx, phys_high |
| nuclear@0 | 28 mov cx, phys_low |
| nuclear@0 | 29 mov si, size_high |
| nuclear@0 | 30 mov di, size_low |
| nuclear@0 | 31 int 0x31 |
| nuclear@0 | 32 add res, 1 |
| nuclear@0 | 33 mov err, eax |
| nuclear@0 | 34 mov mem_high, bx |
| nuclear@0 | 35 mov mem_low, cx |
| nuclear@0 | 36 } |
| nuclear@0 | 37 |
| nuclear@0 | 38 if(res == 2) { |
| nuclear@0 | 39 return 0; |
| nuclear@0 | 40 } |
| nuclear@0 | 41 return (void*)(((uint32_t)mem_high << 16) | ((uint32_t)mem_low)); |
| nuclear@0 | 42 } |
| nuclear@0 | 43 |
| nuclear@0 | 44 void dpmi_munmap(void *addr) |
| nuclear@0 | 45 { |
| nuclear@0 | 46 uint16_t mem_high = (uint32_t)addr >> 16; |
| nuclear@0 | 47 uint16_t mem_low = (uint16_t)addr; |
| nuclear@0 | 48 |
| nuclear@0 | 49 __asm { |
| nuclear@0 | 50 mov eax, 0x801 |
| nuclear@0 | 51 mov bx, mem_high |
| nuclear@0 | 52 mov cx, mem_low |
| nuclear@0 | 53 int 0x31 |
| nuclear@0 | 54 } |
| nuclear@0 | 55 } |