Initial import

1 files changed, 390 insertions, 0 deletions

diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c
new file mode 100644
index 000000000..62b9e04d4
--- /dev/null
+++ b/arch/x86/kernel/early_printk.c
@@ -0,0 +1,390 @@
+#include <linux/console.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/screen_info.h>
+#include <linux/usb/ch9.h>
+#include <linux/pci_regs.h>
+#include <linux/pci_ids.h>
+#include <linux/errno.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/fcntl.h>
+#include <asm/setup.h>
+#include <xen/hvc-console.h>
+#include <asm/pci-direct.h>
+#include <asm/fixmap.h>
+#include <asm/intel-mid.h>
+#include <asm/pgtable.h>
+#include <linux/usb/ehci_def.h>
+#include <linux/efi.h>
+#include <asm/efi.h>
+#include <asm/pci_x86.h>
+
+/* Simple VGA output */
+#define VGABASE		(__ISA_IO_base + 0xb8000)
+
+static int max_ypos = 25, max_xpos = 80;
+static int current_ypos = 25, current_xpos;
+
+static void early_vga_write(struct console *con, const char *str, unsigned n,
+                            unsigned int loglevel)
+{
+	char c;
+	int  i, k, j;
+
+	while ((c = *str++) != '\0' && n-- > 0) {
+		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 (i = 0; i < max_xpos; i++)
+				writew(0x720, VGABASE + 2*(max_xpos*j + i));
+			current_ypos = max_ypos-1;
+		}
+#ifdef CONFIG_KGDB_KDB
+		if (c == '\b') {
+			if (current_xpos > 0)
+				current_xpos--;
+		} else if (c == '\r') {
+			current_xpos = 0;
+		} else
+#endif
+		if (c == '\n') {
+			current_xpos = 0;
+			current_ypos++;
+		} else if (c != '\r')  {
+			writew(((0x7 << 8) | (unsigned short) c),
+			       VGABASE + 2*(max_xpos*current_ypos +
+						current_xpos++));
+			if (current_xpos >= max_xpos) {
+				current_xpos = 0;
+				current_ypos++;
+			}
+		}
+	}
+}
+
+static struct console early_vga_console = {
+	.name =		"earlyvga",
+	.write =	early_vga_write,
+	.flags =	CON_PRINTBUFFER,
+	.index =	-1,
+};
+
+/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
+
+static unsigned long early_serial_base = 0x3f8;  /* ttyS0 */
+
+#define XMTRDY          0x20
+
+#define DLAB		0x80
+
+#define TXR             0       /*  Transmit register (WRITE) */
+#define RXR             0       /*  Receive register  (READ)  */
+#define IER             1       /*  Interrupt Enable          */
+#define IIR             2       /*  Interrupt ID              */
+#define FCR             2       /*  FIFO control              */
+#define LCR             3       /*  Line control              */
+#define MCR             4       /*  Modem control             */
+#define LSR             5       /*  Line Status               */
+#define MSR             6       /*  Modem Status              */
+#define DLL             0       /*  Divisor Latch Low         */
+#define DLH             1       /*  Divisor latch High        */
+
+static unsigned int io_serial_in(unsigned long addr, int offset)
+{
+	return inb(addr + offset);
+}
+
+static void io_serial_out(unsigned long addr, int offset, int value)
+{
+	outb(value, addr + offset);
+}
+
+static unsigned int (*serial_in)(unsigned long addr, int offset) = io_serial_in;
+static void (*serial_out)(unsigned long addr, int offset, int value) = io_serial_out;
+
+static int early_serial_putc(unsigned char ch)
+{
+	unsigned timeout = 0xffff;
+
+	while ((serial_in(early_serial_base, LSR) & XMTRDY) == 0 && --timeout)
+		cpu_relax();
+	serial_out(early_serial_base, TXR, ch);
+	return timeout ? 0 : -1;
+}
+
+static void early_serial_write(struct console *con, const char *s, unsigned n,
+                               unsigned int loglevel)
+{
+	while (*s && n-- > 0) {
+		if (*s == '\n')
+			early_serial_putc('\r');
+		early_serial_putc(*s);
+		s++;
+	}
+}
+
+static __init void early_serial_hw_init(unsigned divisor)
+{
+	unsigned char c;
+
+	serial_out(early_serial_base, LCR, 0x3);	/* 8n1 */
+	serial_out(early_serial_base, IER, 0);	/* no interrupt */
+	serial_out(early_serial_base, FCR, 0);	/* no fifo */
+	serial_out(early_serial_base, MCR, 0x3);	/* DTR + RTS */
+
+	c = serial_in(early_serial_base, LCR);
+	serial_out(early_serial_base, LCR, c | DLAB);
+	serial_out(early_serial_base, DLL, divisor & 0xff);
+	serial_out(early_serial_base, DLH, (divisor >> 8) & 0xff);
+	serial_out(early_serial_base, LCR, c & ~DLAB);
+}
+
+#define DEFAULT_BAUD 9600
+
+static __init void early_serial_init(char *s)
+{
+	unsigned divisor;
+	unsigned long baud = DEFAULT_BAUD;
+	char *e;
+
+	if (*s == ',')
+		++s;
+
+	if (*s) {
+		unsigned port;
+		if (!strncmp(s, "0x", 2)) {
+			early_serial_base = simple_strtoul(s, &e, 16);
+		} else {
+			static const int __initconst bases[] = { 0x3f8, 0x2f8 };
+
+			if (!strncmp(s, "ttyS", 4))
+				s += 4;
+			port = simple_strtoul(s, &e, 10);
+			if (port > 1 || s == e)
+				port = 0;
+			early_serial_base = bases[port];
+		}
+		s += strcspn(s, ",");
+		if (*s == ',')
+			s++;
+	}
+
+	if (*s) {
+		if (kstrtoul(s, 0, &baud) < 0 || baud == 0)
+			baud = DEFAULT_BAUD;
+	}
+
+	/* Convert from baud to divisor value */
+	divisor = 115200 / baud;
+
+	/* These will always be IO based ports */
+	serial_in = io_serial_in;
+	serial_out = io_serial_out;
+
+	/* Set up the HW */
+	early_serial_hw_init(divisor);
+}
+
+#ifdef CONFIG_PCI
+static void mem32_serial_out(unsigned long addr, int offset, int value)
+{
+	u32 *vaddr = (u32 *)addr;
+	/* shift implied by pointer type */
+	writel(value, vaddr + offset);
+}
+
+static unsigned int mem32_serial_in(unsigned long addr, int offset)
+{
+	u32 *vaddr = (u32 *)addr;
+	/* shift implied by pointer type */
+	return readl(vaddr + offset);
+}
+
+/*
+ * early_pci_serial_init()
+ *
+ * This function is invoked when the early_printk param starts with "pciserial"
+ * The rest of the param should be ",B:D.F,baud" where B, D & F describe the
+ * location of a PCI device that must be a UART device.
+ */
+static __init void early_pci_serial_init(char *s)
+{
+	unsigned divisor;
+	unsigned long baud = DEFAULT_BAUD;
+	u8 bus, slot, func;
+	u32 classcode, bar0;
+	u16 cmdreg;
+	char *e;
+
+
+	/*
+	 * First, part the param to get the BDF values
+	 */
+	if (*s == ',')
+		++s;
+
+	if (*s == 0)
+		return;
+
+	bus = (u8)simple_strtoul(s, &e, 16);
+	s = e;
+	if (*s != ':')
+		return;
+	++s;
+	slot = (u8)simple_strtoul(s, &e, 16);
+	s = e;
+	if (*s != '.')
+		return;
+	++s;
+	func = (u8)simple_strtoul(s, &e, 16);
+	s = e;
+
+	/* A baud might be following */
+	if (*s == ',')
+		s++;
+
+	/*
+	 * Second, find the device from the BDF
+	 */
+	cmdreg = read_pci_config(bus, slot, func, PCI_COMMAND);
+	classcode = read_pci_config(bus, slot, func, PCI_CLASS_REVISION);
+	bar0 = read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0);
+
+	/*
+	 * Verify it is a UART type device
+	 */
+	if (((classcode >> 16 != PCI_CLASS_COMMUNICATION_MODEM) &&
+	     (classcode >> 16 != PCI_CLASS_COMMUNICATION_SERIAL)) ||
+	   (((classcode >> 8) & 0xff) != 0x02)) /* 16550 I/F at BAR0 */
+		return;
+
+	/*
+	 * Determine if it is IO or memory mapped
+	 */
+	if (bar0 & 0x01) {
+		/* it is IO mapped */
+		serial_in = io_serial_in;
+		serial_out = io_serial_out;
+		early_serial_base = bar0&0xfffffffc;
+		write_pci_config(bus, slot, func, PCI_COMMAND,
+						cmdreg|PCI_COMMAND_IO);
+	} else {
+		/* It is memory mapped - assume 32-bit alignment */
+		serial_in = mem32_serial_in;
+		serial_out = mem32_serial_out;
+		/* WARNING! assuming the address is always in the first 4G */
+		early_serial_base =
+			(unsigned long)early_ioremap(bar0 & 0xfffffff0, 0x10);
+		write_pci_config(bus, slot, func, PCI_COMMAND,
+						cmdreg|PCI_COMMAND_MEMORY);
+	}
+
+	/*
+	 * Lastly, initalize the hardware
+	 */
+	if (*s) {
+		if (strcmp(s, "nocfg") == 0)
+			/* Sometimes, we want to leave the UART alone
+			 * and assume the BIOS has set it up correctly.
+			 * "nocfg" tells us this is the case, and we
+			 * should do no more setup.
+			 */
+			return;
+		if (kstrtoul(s, 0, &baud) < 0 || baud == 0)
+			baud = DEFAULT_BAUD;
+	}
+
+	/* Convert from baud to divisor value */
+	divisor = 115200 / baud;
+
+	/* Set up the HW */
+	early_serial_hw_init(divisor);
+}
+#endif
+
+static struct console early_serial_console = {
+	.name =		"earlyser",
+	.write =	early_serial_write,
+	.flags =	CON_PRINTBUFFER,
+	.index =	-1,
+};
+
+static inline void early_console_register(struct console *con, int keep_early)
+{
+	if (con->index != -1) {
+		printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
+		       con->name);
+		return;
+	}
+	early_console = con;
+	if (keep_early)
+		early_console->flags &= ~CON_BOOT;
+	else
+		early_console->flags |= CON_BOOT;
+	register_console(early_console);
+}
+
+static int __init setup_early_printk(char *buf)
+{
+	int keep;
+
+	if (!buf)
+		return 0;
+
+	if (early_console)
+		return 0;
+
+	keep = (strstr(buf, "keep") != NULL);
+
+	while (*buf != '\0') {
+		if (!strncmp(buf, "serial", 6)) {
+			buf += 6;
+			early_serial_init(buf);
+			early_console_register(&early_serial_console, keep);
+			if (!strncmp(buf, ",ttyS", 5))
+				buf += 5;
+		}
+		if (!strncmp(buf, "ttyS", 4)) {
+			early_serial_init(buf + 4);
+			early_console_register(&early_serial_console, keep);
+		}
+#ifdef CONFIG_PCI
+		if (!strncmp(buf, "pciserial", 9)) {
+			early_pci_serial_init(buf + 9);
+			early_console_register(&early_serial_console, keep);
+			buf += 9; /* Keep from match the above "serial" */
+		}
+#endif
+		if (!strncmp(buf, "vga", 3) &&
+		    boot_params.screen_info.orig_video_isVGA == 1) {
+			max_xpos = boot_params.screen_info.orig_video_cols;
+			max_ypos = boot_params.screen_info.orig_video_lines;
+			current_ypos = boot_params.screen_info.orig_y;
+			early_console_register(&early_vga_console, keep);
+		}
+#ifdef CONFIG_EARLY_PRINTK_DBGP
+		if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
+			early_console_register(&early_dbgp_console, keep);
+#endif
+#ifdef CONFIG_HVC_XEN
+		if (!strncmp(buf, "xen", 3))
+			early_console_register(&xenboot_console, keep);
+#endif
+#ifdef CONFIG_EARLY_PRINTK_EFI
+		if (!strncmp(buf, "efi", 3))
+			early_console_register(&early_efi_console, keep);
+#endif
+
+		buf++;
+	}
+	return 0;
+}
+
+early_param("earlyprintk", setup_early_printk);