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Diffstat (limited to 'arch/x86_64/kernel/early_printk.c')
-rw-r--r--arch/x86_64/kernel/early_printk.c116
1 files changed, 57 insertions, 59 deletions
diff --git a/arch/x86_64/kernel/early_printk.c b/arch/x86_64/kernel/early_printk.c
index 6dffb498ccd7..13af920b6594 100644
--- a/arch/x86_64/kernel/early_printk.c
+++ b/arch/x86_64/kernel/early_printk.c
@@ -17,11 +17,8 @@
#define VGABASE ((void __iomem *)0xffffffff800b8000UL)
#endif
-#define MAX_YPOS max_ypos
-#define MAX_XPOS max_xpos
-
static int max_ypos = 25, max_xpos = 80;
-static int current_ypos = 1, current_xpos = 0;
+static int current_ypos = 25, current_xpos = 0;
static void early_vga_write(struct console *con, const char *str, unsigned n)
{
@@ -29,26 +26,26 @@ static void early_vga_write(struct console *con, const char *str, unsigned n)
int i, k, j;
while ((c = *str++) != '\0' && n-- > 0) {
- if (current_ypos >= MAX_YPOS) {
+ if (current_ypos >= max_ypos) {
/* scroll 1 line up */
- for (k = 1, j = 0; k < MAX_YPOS; k++, j++) {
- for (i = 0; i < MAX_XPOS; i++) {
- writew(readw(VGABASE + 2*(MAX_XPOS*k + i)),
- VGABASE + 2*(MAX_XPOS*j + i));
+ for (k = 1, j = 0; k < max_ypos; k++, j++) {
+ for (i = 0; i < max_xpos; i++) {
+ writew(readw(VGABASE+2*(max_xpos*k+i)),
+ VGABASE + 2*(max_xpos*j + i));
}
}
- for (i = 0; i < MAX_XPOS; i++)
- writew(0x720, VGABASE + 2*(MAX_XPOS*j + i));
- current_ypos = MAX_YPOS-1;
+ for (i = 0; i < max_xpos; i++)
+ writew(0x720, VGABASE + 2*(max_xpos*j + i));
+ current_ypos = max_ypos-1;
}
if (c == '\n') {
current_xpos = 0;
current_ypos++;
} else if (c != '\r') {
writew(((0x7 << 8) | (unsigned short) c),
- VGABASE + 2*(MAX_XPOS*current_ypos +
+ VGABASE + 2*(max_xpos*current_ypos +
current_xpos++));
- if (current_xpos >= MAX_XPOS) {
+ if (current_xpos >= max_xpos) {
current_xpos = 0;
current_ypos++;
}
@@ -63,7 +60,7 @@ static struct console early_vga_console = {
.index = -1,
};
-/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
+/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
static int early_serial_base = 0x3f8; /* ttyS0 */
@@ -83,30 +80,30 @@ static int early_serial_base = 0x3f8; /* ttyS0 */
#define DLL 0 /* Divisor Latch Low */
#define DLH 1 /* Divisor latch High */
-static int early_serial_putc(unsigned char ch)
-{
- unsigned timeout = 0xffff;
- while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
+static int early_serial_putc(unsigned char ch)
+{
+ unsigned timeout = 0xffff;
+ while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
cpu_relax();
outb(ch, early_serial_base + TXR);
return timeout ? 0 : -1;
-}
+}
static void early_serial_write(struct console *con, const char *s, unsigned n)
{
- while (*s && n-- > 0) {
- early_serial_putc(*s);
- if (*s == '\n')
- early_serial_putc('\r');
- s++;
- }
-}
+ while (*s && n-- > 0) {
+ early_serial_putc(*s);
+ if (*s == '\n')
+ early_serial_putc('\r');
+ s++;
+ }
+}
#define DEFAULT_BAUD 9600
static __init void early_serial_init(char *s)
{
- unsigned char c;
+ unsigned char c;
unsigned divisor;
unsigned baud = DEFAULT_BAUD;
char *e;
@@ -115,7 +112,7 @@ static __init void early_serial_init(char *s)
++s;
if (*s) {
- unsigned port;
+ unsigned port;
if (!strncmp(s,"0x",2)) {
early_serial_base = simple_strtoul(s, &e, 16);
} else {
@@ -139,16 +136,16 @@ static __init void early_serial_init(char *s)
outb(0x3, early_serial_base + MCR); /* DTR + RTS */
if (*s) {
- baud = simple_strtoul(s, &e, 0);
- if (baud == 0 || s == e)
+ baud = simple_strtoul(s, &e, 0);
+ if (baud == 0 || s == e)
baud = DEFAULT_BAUD;
- }
-
- divisor = 115200 / baud;
- c = inb(early_serial_base + LCR);
- outb(c | DLAB, early_serial_base + LCR);
- outb(divisor & 0xff, early_serial_base + DLL);
- outb((divisor >> 8) & 0xff, early_serial_base + DLH);
+ }
+
+ divisor = 115200 / baud;
+ c = inb(early_serial_base + LCR);
+ outb(c | DLAB, early_serial_base + LCR);
+ outb(divisor & 0xff, early_serial_base + DLL);
+ outb((divisor >> 8) & 0xff, early_serial_base + DLH);
outb(c & ~DLAB, early_serial_base + LCR);
}
@@ -205,67 +202,68 @@ struct console *early_console = &early_vga_console;
static int early_console_initialized = 0;
void early_printk(const char *fmt, ...)
-{
- char buf[512];
- int n;
+{
+ char buf[512];
+ int n;
va_list ap;
- va_start(ap,fmt);
+ va_start(ap,fmt);
n = vscnprintf(buf,512,fmt,ap);
early_console->write(early_console,buf,n);
- va_end(ap);
-}
+ va_end(ap);
+}
static int __initdata keep_early;
-int __init setup_early_printk(char *opt)
-{
+int __init setup_early_printk(char *opt)
+{
char *space;
- char buf[256];
+ char buf[256];
if (early_console_initialized)
return -1;
- strlcpy(buf,opt,sizeof(buf));
- space = strchr(buf, ' ');
+ strlcpy(buf,opt,sizeof(buf));
+ space = strchr(buf, ' ');
if (space)
- *space = 0;
+ *space = 0;
if (strstr(buf,"keep"))
- keep_early = 1;
+ keep_early = 1;
- if (!strncmp(buf, "serial", 6)) {
+ if (!strncmp(buf, "serial", 6)) {
early_serial_init(buf + 6);
early_console = &early_serial_console;
- } else if (!strncmp(buf, "ttyS", 4)) {
+ } else if (!strncmp(buf, "ttyS", 4)) {
early_serial_init(buf);
- early_console = &early_serial_console;
+ early_console = &early_serial_console;
} else if (!strncmp(buf, "vga", 3)
&& SCREEN_INFO.orig_video_isVGA == 1) {
max_xpos = SCREEN_INFO.orig_video_cols;
max_ypos = SCREEN_INFO.orig_video_lines;
- early_console = &early_vga_console;
+ current_ypos = SCREEN_INFO.orig_y;
+ early_console = &early_vga_console;
} else if (!strncmp(buf, "simnow", 6)) {
simnow_init(buf + 6);
early_console = &simnow_console;
keep_early = 1;
}
early_console_initialized = 1;
- register_console(early_console);
+ register_console(early_console);
return 0;
}
void __init disable_early_printk(void)
-{
+{
if (!early_console_initialized || !early_console)
return;
if (!keep_early) {
printk("disabling early console\n");
unregister_console(early_console);
early_console_initialized = 0;
- } else {
+ } else {
printk("keeping early console\n");
}
-}
+}
__setup("earlyprintk=", setup_early_printk);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.