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copy over debug print to COM ports from UNSTABLE branch

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This commit is contained in:
Kenneth J Davis 2024-02-10 17:27:23 -05:00
parent 795c1df742
commit 7a73120228
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GPG Key ID: 59D5F216C38F11FD
2 changed files with 82 additions and 5 deletions
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51
kernel/console.asm
View File

@ -57,6 +57,11 @@ uScanCode db 0 ; Scan code for con: device
global _kbdType
_kbdType db 0 ; 00 for 84key, 10h for 102key
%IFDEF DEBUG_PRINT_COMPORT
ASYNC_NEED_INIT db 1
%ENDIF
global ConInit
ConInit:
xor ax,ax
@ -245,12 +250,58 @@ _int29_handler:
push di
push bp
push bx
%IFDEF DEBUG_PRINT_COMPORT
cmp bx, 0xFD05 ; magic value for COM print routine
je .comprint
%ENDIF
mov ah,0Eh
mov bx,7
int 10h ; write char al, teletype mode
.int29hndlr_ret:
pop bx
pop bp
pop di
pop si
pop ax
iret
%IFDEF DEBUG_PRINT_COMPORT
.comprint:
push dx
mov dx, 1 ; 0=COM1,1=COM2,2=COM3,3=COM4
mov ah, [cs:ASYNC_NEED_INIT]
or ah,ah
jz .skip_init
push ax ; preserve char (AL) to print
; initialize serial port using BIOS to DOS default
; of 2400 bps, 8 data bits, 1 stop bit, and no parity
mov ax, 0x00A3
int 14h ; BIOS initialize serial port
mov ax, 0x011B ; clear the remote screen (ESC[2J)
int 14h ; BIOS write character to serial port
mov ax, 0x015B ; '['
int 14h ; BIOS write character to serial port
mov ax, 0x0132 ; '2'
int 14h ; BIOS write character to serial port
mov ax, 0x014A ; 'J'
int 14h ; BIOS write character to serial port
; mark initialization complete
mov byte [cs:ASYNC_NEED_INIT], 0
pop ax ; restore char to print
.skip_init:
cmp al, 0x0A ; do we need to add a carriage return?
jne .print_it
mov ax, 0x010D ; print as \r\n
int 14h
mov al, 0x0A
.print_it:
mov ah, 0x01
int 14h ; BIOS write character to serial port
pop dx
jmp .int29hndlr_ret
%ENDIF ; DEBUG_PRINT_COMPORT

36
kernel/prf.c
View File

@ -100,6 +100,13 @@ void put_console(int c)
#ifdef __WATCOMC__
void int29(char c);
#pragma aux int29 = "int 0x29" parm [al] modify exact [bx];
#ifdef DEBUG_PRINT_COMPORT
void fastComPrint(char c);
#pragma aux fastComPrint = \
"mov bx, 0xFD05" \
"int 0x29" parm [al] modify exact [bx];
#endif
#endif
void put_console(int c)
@ -115,6 +122,9 @@ void put_console(int c)
__int__(0x29);
#elif defined(__WATCOMC__)
int29(c);
#if defined DEBUG_PRINT_COMPORT
fastComPrint(c);
#endif
#elif defined(__GNUC__)
asm volatile("int $0x29" : : "a"(c) : "bx");
#elif defined(I86)
@ -157,6 +167,11 @@ STATIC VOID handle_char(COUNT c)
if (charp == 0)
put_console(c);
else
#ifdef DEBUG_PRINT_COMPORT
if (charp == (BYTE SSFAR *)-1)
fastComPrint(c);
else
#endif
*charp++ = c;
}
@ -237,13 +252,24 @@ int VA_CDECL sprintf(char * buff, CONST char * fmt, ...)
return 0;
}
#ifdef DEBUG_PRINT_COMPORT
int dbgc_printf(CONST char * fmt, ...)
{
va_list arg;
va_start(arg, fmt);
charp = (BYTE SSFAR *)-1;
do_printf(fmt, arg);
handle_char('\0');
return 0;
}
#endif
STATIC void do_printf(CONST BYTE * fmt, va_list arg)
{
int base;
BYTE s[11];
BYTE FAR * p;
int size;
unsigned char flags;
int base, size;
BYTE s[13]; /* long enough for a 32-bit octal number string with sign */
BYTE flags, FAR *p;
for (;*fmt != '\0'; fmt++)
{