conio.S revision 1.1
1 1.1 perry /* $NetBSD: conio.S,v 1.1 1997/03/14 02:40:32 perry Exp $ */ 2 1.1 perry 3 1.1 perry /* PC console handling 4 1.1 perry originally from: FreeBSD:sys/i386/boot/netboot/start2.S 5 1.1 perry */ 6 1.1 perry 7 1.1 perry #include <machine/asm.h> 8 1.1 perry 9 1.1 perry #define data32 .byte 0x66 10 1.1 perry 11 1.1 perry .text 12 1.1 perry 13 1.1 perry /************************************************************************** 14 1.1 perry PUTC - Print a character 15 1.1 perry **************************************************************************/ 16 1.1 perry ENTRY(conputc) 17 1.1 perry push %ebp 18 1.1 perry mov %esp,%ebp 19 1.1 perry push %ecx 20 1.1 perry push %ebx 21 1.1 perry push %esi 22 1.1 perry push %edi 23 1.1 perry 24 1.1 perry movb 8(%ebp),%cl 25 1.1 perry 26 1.1 perry call _C_LABEL(prot_to_real) # enter real mode 27 1.1 perry 28 1.1 perry movb %cl,%al 29 1.1 perry data32 30 1.1 perry mov $1,%ebx 31 1.1 perry movb $0x0e,%ah 32 1.1 perry int $0x10 33 1.1 perry 34 1.1 perry data32 35 1.1 perry call _C_LABEL(real_to_prot) # back to protected mode 36 1.1 perry 37 1.1 perry pop %edi 38 1.1 perry pop %esi 39 1.1 perry pop %ebx 40 1.1 perry pop %ecx 41 1.1 perry pop %ebp 42 1.1 perry ret 43 1.1 perry 44 1.1 perry /************************************************************************** 45 1.1 perry GETC - Get a character 46 1.1 perry **************************************************************************/ 47 1.1 perry ENTRY(congetc) 48 1.1 perry push %ebp 49 1.1 perry mov %esp,%ebp 50 1.1 perry push %ebx 51 1.1 perry push %esi 52 1.1 perry push %edi 53 1.1 perry 54 1.1 perry call _C_LABEL(prot_to_real) # enter real mode 55 1.1 perry 56 1.1 perry movb $0x0,%ah 57 1.1 perry int $0x16 58 1.1 perry movb %al,%bl 59 1.1 perry 60 1.1 perry data32 61 1.1 perry call _C_LABEL(real_to_prot) # back to protected mode 62 1.1 perry 63 1.1 perry xor %eax,%eax 64 1.1 perry movb %bl,%al 65 1.1 perry 66 1.1 perry pop %edi 67 1.1 perry pop %esi 68 1.1 perry pop %ebx 69 1.1 perry pop %ebp 70 1.1 perry ret 71 1.1 perry 72 1.1 perry /************************************************************************** 73 1.1 perry ISKEY - Check for keyboard interrupt 74 1.1 perry **************************************************************************/ 75 1.1 perry ENTRY(coniskey) 76 1.1 perry push %ebp 77 1.1 perry mov %esp,%ebp 78 1.1 perry push %ebx 79 1.1 perry push %esi 80 1.1 perry push %edi 81 1.1 perry 82 1.1 perry call _C_LABEL(prot_to_real) # enter real mode 83 1.1 perry 84 1.1 perry xor %ebx,%ebx 85 1.1 perry movb $0x1,%ah 86 1.1 perry int $0x16 87 1.1 perry data32 88 1.1 perry jz 1f 89 1.1 perry movb %al,%bl 90 1.1 perry 1: 91 1.1 perry 92 1.1 perry data32 93 1.1 perry call _C_LABEL(real_to_prot) # back to protected mode 94 1.1 perry 95 1.1 perry xor %eax,%eax 96 1.1 perry movb %bl,%al 97 1.1 perry 98 1.1 perry pop %edi 99 1.1 perry pop %esi 100 1.1 perry pop %ebx 101 1.1 perry pop %ebp 102 1.1 perry ret 103
Indexes created Sun Sep 28 07:09:56 GMT 2025