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Set up a fake device for early boot logging

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This commit is contained in:
Kevin Lange 2014-04-12 23:02:03 -07:00
parent 9e50872d5e
commit 8cd386ba5b
1 changed files with 16 additions and 0 deletions
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16
kernel/main.c
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@ -51,6 +51,22 @@ uintptr_t initial_esp = 0;
fs_node_t * ramdisk_mount(uintptr_t, size_t);
#ifdef EARLY_BOT_LOG
#define EARLY_LOG_DEVICE 0x3F8
static uint32_t _early_log_write(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
for (unsigned int i = 0; i < size; ++i) {
outportb(EARLY_LOG_DEVICE, buffer[i]);
}
return size;
}
fs_node_t _early_log = { .write = &_early_log_write };
#define ENABLE_EARLY_BOOT_LOG(level) do { debug_file = &_early_log; debug_level = (level); } while (0)
#define DISABLE_EARLY_BOOT_LOG() do { debug_file = NULL; debug_level = NOTICE; } while (0)
#else
#define ENABLE_EARLY_BOOT_LOG(level)
#define DISABLE_EARLY_BOOT_LOG()
#endif
/*
* multiboot i386 (pc) kernel entry point
*/