1 // Raw screen writing code.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
5 // This file may be distributed under the terms of the GNU GPLv3 license.
7 #include <stdarg.h> // va_list
9 #include "farptr.h" // GET_VAR
10 #include "util.h" // bprintf
11 #include "biosvar.h" // struct bregs
20 #define PORT_DEBUG 0x403
22 // Write a charcter to the framebuffer.
24 putc(u16 action, char c)
30 // Write a string to the framebuffer.
32 puts(u16 action, const char *s)
38 // Write a string to the framebuffer.
40 puts_cs(u16 action, const char *s)
43 char c = GET_VAR(CS, (u8)*s);
50 // Write an unsigned integer to the screen.
52 putuint(u16 action, u32 val)
55 char *d = &buf[sizeof(buf) - 1];
58 *d = (val % 10) + '0';
67 // Write a single digit hex character to the screen.
69 putsinglehex(u16 action, u32 val)
78 // Write an integer in hexadecimal to the screen.
80 puthex(u16 action, u32 val)
82 putsinglehex(action, (val >> 28) & 0xf);
83 putsinglehex(action, (val >> 24) & 0xf);
84 putsinglehex(action, (val >> 20) & 0xf);
85 putsinglehex(action, (val >> 16) & 0xf);
86 putsinglehex(action, (val >> 12) & 0xf);
87 putsinglehex(action, (val >> 8) & 0xf);
88 putsinglehex(action, (val >> 4) & 0xf);
89 putsinglehex(action, (val >> 0) & 0xf);
93 bprintf(u16 action, const char *fmt, ...)
99 char c = GET_VAR(CS, (u8)*s);
107 c = GET_VAR(CS, (u8)*n);
115 val = va_arg(args, s32);
120 putuint(action, val);
123 val = va_arg(args, s32);
124 putuint(action, val);
127 val = va_arg(args, s32);
131 sarg = va_arg(args, const char *);
132 puts_cs(action, sarg);
143 // Function called on handler startup.
145 __debug_enter(const char *fname, struct bregs *regs)
147 bprintf(0, "enter %s: a=%x b=%x c=%x d=%x si=%x di=%x\n"
148 , fname, regs->eax, regs->ebx, regs->ecx, regs->edx
149 , regs->esi, regs->edi);
153 __debug_exit(const char *fname, struct bregs *regs)
155 if (! (regs->flags & F_CF))
157 bprintf(0, "exit %s: a=%x b=%x c=%x d=%x s=%x i=%x\n"
158 , fname, regs->eax, regs->ebx, regs->ecx, regs->edx
159 , regs->esi, regs->edi);