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Kernel+LibC: Add a DebugLogDevice that forwards everything to I/O port 0xe9.

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This is then used to implement the userspace dbgprintf() in a far more
efficient way than what we had before. :^)
This commit is contained in:
Andreas Kling 2019-04-18 16:08:52 +02:00
parent 3b986da643
commit 3817f5f619
7 changed files with 61 additions and 7 deletions
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17
LibC/stdio.cpp
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@ -13,10 +13,11 @@
extern "C" {
static FILE __default_streams[3];
static FILE __default_streams[4];
FILE* stdin;
FILE* stdout;
FILE* stderr;
FILE* stddbg;
void init_FILE(FILE& fp, int fd, int mode)
{
@ -39,9 +40,16 @@ void __stdio_init()
stdin = &__default_streams[0];
stdout = &__default_streams[1];
stderr = &__default_streams[2];
stddbg = &__default_streams[3];
init_FILE(*stdin, 0, isatty(0) ? _IOLBF : _IOFBF);
init_FILE(*stdout, 1, isatty(1) ? _IOLBF : _IOFBF);
init_FILE(*stderr, 2, _IONBF);
int fd = open("/dev/debuglog", O_WRONLY);
if (fd < 0) {
perror("open /dev/debuglog");
ASSERT_NOT_REACHED();
}
init_FILE(*stddbg, fd, _IOLBF);
}
int setvbuf(FILE* stream, char* buf, int mode, size_t size)
@ -263,16 +271,11 @@ void rewind(FILE* stream)
fseek(stream, 0, SEEK_SET);
}
static void sys_putch(char*&, char ch)
{
syscall(SC_putch, ch);
}
int dbgprintf(const char* fmt, ...)
{
va_list ap;
va_start(ap, fmt);
int ret = printf_internal(sys_putch, nullptr, fmt, ap);
int ret = vfprintf(stddbg, fmt, ap);
va_end(ap);
return ret;
}