// SPDX-License-Identifier: GPL-2.0/* *	linux/arch/alpha/kernel/console.c * * Architecture-specific specific support for VGA device on  * non-0 I/O hose */ #include <linux/pci.h>#include <linux/init.h>#include <linux/tty.h>#include <linux/console.h>#include <linux/vt.h>#include <asm/vga.h>#include <asm/machvec.h> #include "pci_impl.h"#include "proto.h" #ifdef CONFIG_VGA_HOSE struct pci_controller *pci_vga_hose;static struct resource alpha_vga = {	.name	= "alpha-vga+",	.flags	= IORESOURCE_IO,	.start	= 0x3C0,	.end	= 0x3DF}; static struct pci_controller * __init default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2){	if (h2->index < h1->index)		return h2; 	return h1;} void __init locate_and_init_vga(void *(*sel_func)(void *, void *)){	struct pci_controller *hose = NULL;	struct pci_dev *dev = NULL; 	/* Default the select function */	if (!sel_func) sel_func = (void *)default_vga_hose_select; 	/* Find the console VGA device */	for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {		if (!hose)			hose = dev->sysdata;		else			hose = sel_func(hose, dev->sysdata);	} 	/* Did we already initialize the correct one? Is there one? */	if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))		return; 	/* Create a new VGA ioport resource WRT the hose it is on. */	alpha_vga.start += hose->io_space->start;	alpha_vga.end += hose->io_space->start;	request_resource(hose->io_space, &alpha_vga); 	/* Set the VGA hose and init the new console. */	pci_vga_hose = hose;	console_lock();	do_take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);	console_unlock();} void __initfind_console_vga_hose(void){	u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset); 	if (pu64[7] == 3) {	/* TERM_TYPE == graphics */		struct pci_controller *hose;		int h = (pu64[30] >> 24) & 0xff;	/* console hose # */ 		/*		 * Our hose numbering DOES match the console's, so find		 * the right one...		 */		for (hose = hose_head; hose; hose = hose->next) {			if (hose->index == h) break;		} 		if (hose) {			printk("Console graphics on hose %d\n", h);			pci_vga_hose = hose;		}	}} #endif