conio.S revision 1.2
1 1.2 dsl /* $NetBSD: conio.S,v 1.2 2003/02/01 14:48:18 dsl 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 1.2 dsl .code16 28 1.1 perry 29 1.1 perry movb %cl,%al 30 1.2 dsl movw $1,%bx 31 1.1 perry movb $0x0e,%ah 32 1.1 perry int $0x10 33 1.1 perry 34 1.2 dsl calll _C_LABEL(real_to_prot) # back to protected mode 35 1.2 dsl .code32 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 1.2 dsl .code16 56 1.1 perry 57 1.1 perry movb $0x0,%ah 58 1.1 perry int $0x16 59 1.1 perry movb %al,%bl 60 1.1 perry 61 1.2 dsl calll _C_LABEL(real_to_prot) # back to protected mode 62 1.2 dsl .code32 63 1.1 perry 64 1.1 perry xor %eax,%eax 65 1.1 perry movb %bl,%al 66 1.1 perry 67 1.1 perry pop %edi 68 1.1 perry pop %esi 69 1.1 perry pop %ebx 70 1.1 perry pop %ebp 71 1.1 perry ret 72 1.1 perry 73 1.1 perry /************************************************************************** 74 1.1 perry ISKEY - Check for keyboard interrupt 75 1.1 perry **************************************************************************/ 76 1.1 perry ENTRY(coniskey) 77 1.1 perry push %ebp 78 1.1 perry mov %esp,%ebp 79 1.1 perry push %ebx 80 1.1 perry push %esi 81 1.1 perry push %edi 82 1.1 perry 83 1.1 perry call _C_LABEL(prot_to_real) # enter real mode 84 1.2 dsl .code16 85 1.1 perry 86 1.2 dsl xor %bx,%bx 87 1.1 perry movb $0x1,%ah 88 1.1 perry int $0x16 89 1.2 dsl movb $0,%bl 90 1.1 perry jz 1f 91 1.2 dsl incb %bl 92 1.1 perry 1: 93 1.1 perry 94 1.2 dsl calll _C_LABEL(real_to_prot) # back to protected mode 95 1.2 dsl .code32 96 1.1 perry 97 1.1 perry xor %eax,%eax 98 1.1 perry movb %bl,%al 99 1.1 perry 100 1.1 perry pop %edi 101 1.1 perry pop %esi 102 1.1 perry pop %ebx 103 1.1 perry pop %ebp 104 1.1 perry ret 105
Indexes created Sun Sep 28 16:09:52 GMT 2025