conio.S revision 1.6
1 1.6 ad /* $NetBSD: conio.S,v 1.6 2008/05/21 01:51:34 ad 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 .text 10 1.1 perry 11 1.1 perry /************************************************************************** 12 1.6 ad CLR - Clear screen 13 1.6 ad **************************************************************************/ 14 1.6 ad ENTRY(conclr) 15 1.6 ad push %ebp 16 1.6 ad mov %esp,%ebp 17 1.6 ad push %ecx 18 1.6 ad push %ebx 19 1.6 ad push %esi 20 1.6 ad push %edi 21 1.6 ad 22 1.6 ad movb 8(%ebp),%cl 23 1.6 ad 24 1.6 ad call _C_LABEL(prot_to_real) # enter real mode 25 1.6 ad .code16 26 1.6 ad 27 1.6 ad /* Clear screen. */ 28 1.6 ad movw $0x0600, %ax 29 1.6 ad movw $0x0700, %bx 30 1.6 ad xorw %cx, %cx 31 1.6 ad movw $0x184f, %dx /* 80x25 */ 32 1.6 ad int $0x10 33 1.6 ad 34 1.6 ad /* Home cursor. */ 35 1.6 ad movb $0x02, %ah 36 1.6 ad xorw %bx, %bx 37 1.6 ad xorw %dx, %dx 38 1.6 ad int $0x10 39 1.6 ad 40 1.6 ad calll _C_LABEL(real_to_prot) # back to protected mode 41 1.6 ad .code32 42 1.6 ad 43 1.6 ad pop %edi 44 1.6 ad pop %esi 45 1.6 ad pop %ebx 46 1.6 ad pop %ecx 47 1.6 ad pop %ebp 48 1.6 ad ret 49 1.6 ad 50 1.6 ad /************************************************************************** 51 1.1 perry PUTC - Print a character 52 1.1 perry **************************************************************************/ 53 1.1 perry ENTRY(conputc) 54 1.1 perry push %ebp 55 1.1 perry mov %esp,%ebp 56 1.1 perry push %ecx 57 1.1 perry push %ebx 58 1.1 perry push %esi 59 1.1 perry push %edi 60 1.1 perry 61 1.1 perry movb 8(%ebp),%cl 62 1.1 perry 63 1.1 perry call _C_LABEL(prot_to_real) # enter real mode 64 1.2 dsl .code16 65 1.1 perry 66 1.1 perry movb %cl,%al 67 1.2 dsl movw $1,%bx 68 1.1 perry movb $0x0e,%ah 69 1.1 perry int $0x10 70 1.1 perry 71 1.2 dsl calll _C_LABEL(real_to_prot) # back to protected mode 72 1.2 dsl .code32 73 1.1 perry 74 1.1 perry pop %edi 75 1.1 perry pop %esi 76 1.1 perry pop %ebx 77 1.1 perry pop %ecx 78 1.1 perry pop %ebp 79 1.1 perry ret 80 1.1 perry 81 1.1 perry /************************************************************************** 82 1.1 perry GETC - Get a character 83 1.1 perry **************************************************************************/ 84 1.1 perry ENTRY(congetc) 85 1.1 perry push %ebp 86 1.1 perry mov %esp,%ebp 87 1.1 perry push %ebx 88 1.1 perry push %esi 89 1.1 perry push %edi 90 1.1 perry 91 1.1 perry call _C_LABEL(prot_to_real) # enter real mode 92 1.2 dsl .code16 93 1.1 perry 94 1.1 perry movb $0x0,%ah 95 1.1 perry int $0x16 96 1.1 perry movb %al,%bl 97 1.1 perry 98 1.2 dsl calll _C_LABEL(real_to_prot) # back to protected mode 99 1.2 dsl .code32 100 1.1 perry 101 1.1 perry xor %eax,%eax 102 1.1 perry movb %bl,%al 103 1.1 perry 104 1.1 perry pop %edi 105 1.1 perry pop %esi 106 1.1 perry pop %ebx 107 1.1 perry pop %ebp 108 1.1 perry ret 109 1.1 perry 110 1.1 perry /************************************************************************** 111 1.3 mycroft ISSHIFT - Check for keyboard interrupt; via shift key 112 1.3 mycroft **************************************************************************/ 113 1.3 mycroft ENTRY(conisshift) 114 1.3 mycroft push %ebp 115 1.3 mycroft mov %esp,%ebp 116 1.3 mycroft push %ebx 117 1.3 mycroft push %esi 118 1.3 mycroft push %edi 119 1.3 mycroft 120 1.3 mycroft call _C_LABEL(prot_to_real) # enter real mode 121 1.3 mycroft .code16 122 1.3 mycroft 123 1.3 mycroft xor %bx,%bx 124 1.3 mycroft movb $0x2,%ah 125 1.3 mycroft int $0x16 126 1.3 mycroft testb $3,%al 127 1.3 mycroft setnz %bl 128 1.3 mycroft 129 1.3 mycroft calll _C_LABEL(real_to_prot) # back to protected mode 130 1.3 mycroft .code32 131 1.3 mycroft 132 1.3 mycroft xor %eax,%eax 133 1.3 mycroft movb %bl,%al 134 1.3 mycroft 135 1.3 mycroft pop %edi 136 1.3 mycroft pop %esi 137 1.3 mycroft pop %ebx 138 1.3 mycroft pop %ebp 139 1.3 mycroft ret 140 1.3 mycroft 141 1.3 mycroft /************************************************************************** 142 1.3 mycroft ISKEY - Check for keyboard input 143 1.1 perry **************************************************************************/ 144 1.1 perry ENTRY(coniskey) 145 1.1 perry push %ebp 146 1.1 perry mov %esp,%ebp 147 1.1 perry push %ebx 148 1.1 perry push %esi 149 1.1 perry push %edi 150 1.1 perry 151 1.1 perry call _C_LABEL(prot_to_real) # enter real mode 152 1.2 dsl .code16 153 1.1 perry 154 1.2 dsl xor %bx,%bx 155 1.1 perry movb $0x1,%ah 156 1.1 perry int $0x16 157 1.3 mycroft setnz %bl 158 1.1 perry 159 1.2 dsl calll _C_LABEL(real_to_prot) # back to protected mode 160 1.2 dsl .code32 161 1.1 perry 162 1.1 perry xor %eax,%eax 163 1.1 perry movb %bl,%al 164 1.1 perry 165 1.1 perry pop %edi 166 1.1 perry pop %esi 167 1.1 perry pop %ebx 168 1.1 perry pop %ebp 169 1.1 perry ret 170
Indexes created Sat Sep 27 14:09:57 GMT 2025