--- /dev/null
+/*
+ * Parse the EFI PCDP table to locate the console device.
+ *
+ * (c) Copyright 2002, 2003, 2004 Hewlett-Packard Development Company, L.P.
+ * Khalid Aziz <khalid.aziz@hp.com>
+ * Alex Williamson <alex.williamson@hp.com>
+ * Bjorn Helgaas <bjorn.helgaas@hp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/console.h>
+#include <linux/efi.h>
+#include <linux/serial.h>
+#ifdef XEN
+#include <linux/errno.h>
+#endif
+#include "pcdp.h"
+
+static int __init
+setup_serial_console(struct pcdp_uart *uart)
+{
+#ifdef XEN
+ extern char opt_com1[1];
+ if (opt_com1[0]) return 0;
+ sprintf(&opt_com1[0], "0x%lx,%lu,%dn1",
+ uart->addr.address, uart->baud,
+ uart->bits ? uart->bits : 8);
+ return 0;
+#else
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+ int mmio;
+ static char options[64];
+
+ mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
+ snprintf(options, sizeof(options), "console=uart,%s,0x%lx,%lun%d",
+ mmio ? "mmio" : "io", uart->addr.address, uart->baud,
+ uart->bits ? uart->bits : 8);
+
+ return early_serial_console_init(options);
+#else
+ return -ENODEV;
+#endif
+#endif
+}
+
+#ifndef XEN
+static int __init
+setup_vga_console(struct pcdp_vga *vga)
+{
+#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
+ if (efi_mem_type(0xA0000) == EFI_CONVENTIONAL_MEMORY) {
+ printk(KERN_ERR "PCDP: VGA selected, but frame buffer is not MMIO!\n");
+ return -ENODEV;
+ }
+
+ conswitchp = &vga_con;
+ printk(KERN_INFO "PCDP: VGA console\n");
+ return 0;
+#else
+ return -ENODEV;
+#endif
+}
+#endif
+
+int __init
+efi_setup_pcdp_console(char *cmdline)
+{
+ struct pcdp *pcdp;
+ struct pcdp_uart *uart;
+ struct pcdp_device *dev, *end;
+ int i, serial = 0;
+
+ pcdp = efi.hcdp;
+ if (!pcdp)
+ return -ENODEV;
+
+#ifndef XEN
+ printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, __pa(pcdp));
+#endif
+
+ if (strstr(cmdline, "console=hcdp")) {
+ if (pcdp->rev < 3)
+ serial = 1;
+ } else if (strstr(cmdline, "console=")) {
+#ifndef XEN
+ printk(KERN_INFO "Explicit \"console=\"; ignoring PCDP\n");
+#endif
+ return -ENODEV;
+ }
+
+ if (pcdp->rev < 3 && efi_uart_console_only())
+ serial = 1;
+
+ for (i = 0, uart = pcdp->uart; i < pcdp->num_uarts; i++, uart++) {
+ if (uart->flags & PCDP_UART_PRIMARY_CONSOLE || serial) {
+ if (uart->type == PCDP_CONSOLE_UART) {
+ return setup_serial_console(uart);
+ }
+ }
+ }
+
+#ifndef XEN
+ end = (struct pcdp_device *) ((u8 *) pcdp + pcdp->length);
+ for (dev = (struct pcdp_device *) (pcdp->uart + pcdp->num_uarts);
+ dev < end;
+ dev = (struct pcdp_device *) ((u8 *) dev + dev->length)) {
+ if (dev->flags & PCDP_PRIMARY_CONSOLE) {
+ if (dev->type == PCDP_CONSOLE_VGA) {
+ return setup_vga_console((struct pcdp_vga *) dev);
+ }
+ }
+ }
+#endif
+
+ return -ENODEV;
+}
projects / xen.git / commitdiff