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Kernel: Add kernelearlyputstr and use it in dbgln in very-early boot

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This variant of dbgputstr does not lock the global log lock, as it is
called before the current or any other processor was initialized,
meaning that:
A) The $gs base was not setup yet, so we cannot enter into critical
   sections, and as a result we cannot use SpinLocks
B) No other processors may try to print at the same time anyway
This commit is contained in:
Idan Horowitz 2021-09-10 21:46:54 +03:00
parent 18d2a74e62
commit 6348b63476
3 changed files with 20 additions and 0 deletions
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Kernel/kstdio.h
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@ -14,6 +14,7 @@ void dbgputch(char);
void dbgputstr(const char*, size_t);
void kernelputstr(const char*, size_t);
void kernelcriticalputstr(const char*, size_t);
void kernelearlyputstr(const char*, size_t);
int snprintf(char* buf, size_t, const char* fmt, ...) __attribute__((format(printf, 3, 4)));
void set_serial_debug(bool on_or_off);
int get_serial_debug();