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
17 memset(&br, 0, sizeof(br));
20 call16_int(0x10, &br);
24 #define PORT_DEBUG 0x403
26 // Write a charcter to the framebuffer.
28 putc(u16 action, char c)
38 // Write a string to the framebuffer.
40 puts(u16 action, const char *s)
46 // Write a string to the framebuffer.
48 puts_cs(u16 action, const char *s)
51 char c = GET_VAR(CS, (u8)*s);
58 // Write an unsigned integer to the screen.
60 putuint(u16 action, u32 val)
63 char *d = &buf[sizeof(buf) - 1];
66 *d = (val % 10) + '0';
75 // Write a single digit hex character to the screen.
77 putsinglehex(u16 action, u32 val)
86 // Write an integer in hexadecimal to the screen.
88 puthex(u16 action, u32 val)
90 putsinglehex(action, (val >> 28) & 0xf);
91 putsinglehex(action, (val >> 24) & 0xf);
92 putsinglehex(action, (val >> 20) & 0xf);
93 putsinglehex(action, (val >> 16) & 0xf);
94 putsinglehex(action, (val >> 12) & 0xf);
95 putsinglehex(action, (val >> 8) & 0xf);
96 putsinglehex(action, (val >> 4) & 0xf);
97 putsinglehex(action, (val >> 0) & 0xf);
107 bprintf(u16 action, const char *fmt, ...)
113 char c = GET_VAR(CS, (u8)*s);
122 c = GET_VAR(CS, (u8)*n);
134 val = va_arg(args, s32);
139 putuint(action, val);
142 val = va_arg(args, s32);
143 putuint(action, val);
146 val = va_arg(args, s32);
150 val = va_arg(args, int);
154 sarg = va_arg(args, const char *);
155 puts_cs(action, sarg);
167 dump_regs(const char *fname, const char *type, struct bregs *regs)
170 bprintf(0, "%s %s: NULL\n", type, fname);
173 bprintf(0, "%s %s: a=%x b=%x c=%x d=%x si=%x di=%x\n"
174 , type, fname, regs->eax, regs->ebx, regs->ecx, regs->edx
175 , regs->esi, regs->edi);
176 bprintf(0, " ds=%x es=%x bp=%x sp=%x ip=%x cs=%x f=%x\n"
177 , regs->ds, regs->es, regs->ebp, regs->esp
178 , regs->ip, regs->cs, regs->flags);
182 __debug_isr(const char *fname, struct bregs *regs)
188 // Function called on handler startup.
190 __debug_enter(const char *fname, struct bregs *regs)
192 // XXX - implement run time suppression test
193 dump_regs(fname, "enter", regs);
197 __debug_exit(const char *fname, struct bregs *regs)
199 if (! (regs->flags & F_CF))
201 dump_regs(fname, "exit", regs);
205 __debug_stub(const char *fname, struct bregs *regs)
207 dump_regs(fname, "stub", regs);