These logs come from tboot (Trusted Boot, an open source, pre-kernel/VMM module that uses Intel TXT to perform a measured and verified launch of an OS kernel/VMM.).
Signed-off-by: Qiaowei Ren <[email protected]> --- arch/x86/kernel/tboot.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index f84fe00..dd6f198 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -31,6 +31,7 @@ #include <linux/pfn.h> #include <linux/mm.h> #include <linux/tboot.h> +#include <linux/debugfs.h> #include <asm/realmode.h> #include <asm/processor.h> @@ -338,6 +339,70 @@ static struct notifier_block tboot_cpu_notifier __cpuinitdata = .notifier_call = tboot_cpu_callback, }; +#if defined(CONFIG_DEBUG_FS) + +#define TBOOT_LOG_UUID {0x26, 0x25, 0x19, 0xc0, 0x30, 0x6b, 0xb4, 0x4d, \ + 0x4c, 0x84, 0xa3, 0xe9, 0x53, 0xb8, 0x81, 0x74} +#define TBOOT_SERIAL_LOG_ADDR 0x60000 +#define TBOOT_SERIAL_LOG_SIZE 0x08000 + +static uint8_t tboot_log_uuid[16] = TBOOT_LOG_UUID; + +struct tboot_log { + uint8_t uuid[16]; + uint32_t max_size; + uint32_t curr_pos; + char buf[]; +}; + +static struct tboot_log *get_log(void) +{ + struct tboot_log *log; + + log = (struct tboot_log *)ioremap_nocache(TBOOT_SERIAL_LOG_ADDR, + TBOOT_SERIAL_LOG_SIZE); + if (!log) + return NULL; + + if (memcmp(&tboot_log_uuid, &log->uuid, sizeof(log->uuid))) { + iounmap(log); + return NULL; + } + + return log; +} + +static ssize_t tboot_log_read(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct tboot_log *log; + + log = get_log(); + if (!log) + return -EFAULT; + + if (*ppos >= log->max_size) + return 0; + + if (*ppos + count > log->max_size) + count = log->max_size - *ppos; + + if (copy_to_user(user_buf, log->buf + *ppos, count)) + return -EFAULT; + + *ppos += count; + + iounmap(log); + return count; +} + +static const struct file_operations tboot_log_fops = { + .read = tboot_log_read, + .llseek = default_llseek, +}; + +#endif /* CONFIG_DEBUG_FS */ + static __init int tboot_late_init(void) { if (!tboot_enabled()) @@ -348,6 +413,11 @@ static __init int tboot_late_init(void) atomic_set(&ap_wfs_count, 0); register_hotcpu_notifier(&tboot_cpu_notifier); +#if defined(CONFIG_DEBUG_FS) + debugfs_create_file("tboot_log", S_IRUSR, + arch_debugfs_dir, NULL, &tboot_log_fops); +#endif + acpi_os_set_prepare_sleep(&tboot_sleep); return 0; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
