cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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console.c (2157B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *	linux/arch/alpha/kernel/console.c
      4 *
      5 * Architecture-specific specific support for VGA device on 
      6 * non-0 I/O hose
      7 */
      8
      9#include <linux/pci.h>
     10#include <linux/init.h>
     11#include <linux/tty.h>
     12#include <linux/console.h>
     13#include <linux/vt.h>
     14#include <asm/vga.h>
     15#include <asm/machvec.h>
     16
     17#include "pci_impl.h"
     18
     19#ifdef CONFIG_VGA_HOSE
     20
     21struct pci_controller *pci_vga_hose;
     22static struct resource alpha_vga = {
     23	.name	= "alpha-vga+",
     24	.flags	= IORESOURCE_IO,
     25	.start	= 0x3C0,
     26	.end	= 0x3DF
     27};
     28
     29static struct pci_controller * __init 
     30default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2)
     31{
     32	if (h2->index < h1->index)
     33		return h2;
     34
     35	return h1;
     36}
     37
     38void __init 
     39locate_and_init_vga(void *(*sel_func)(void *, void *))
     40{
     41	struct pci_controller *hose = NULL;
     42	struct pci_dev *dev = NULL;
     43
     44	/* Default the select function */
     45	if (!sel_func) sel_func = (void *)default_vga_hose_select;
     46
     47	/* Find the console VGA device */
     48	for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) {
     49		if (!hose)
     50			hose = dev->sysdata;
     51		else
     52			hose = sel_func(hose, dev->sysdata);
     53	}
     54
     55	/* Did we already initialize the correct one? Is there one? */
     56	if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose))
     57		return;
     58
     59	/* Create a new VGA ioport resource WRT the hose it is on. */
     60	alpha_vga.start += hose->io_space->start;
     61	alpha_vga.end += hose->io_space->start;
     62	request_resource(hose->io_space, &alpha_vga);
     63
     64	/* Set the VGA hose and init the new console. */
     65	pci_vga_hose = hose;
     66	console_lock();
     67	do_take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
     68	console_unlock();
     69}
     70
     71void __init
     72find_console_vga_hose(void)
     73{
     74	u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset);
     75
     76	if (pu64[7] == 3) {	/* TERM_TYPE == graphics */
     77		struct pci_controller *hose;
     78		int h = (pu64[30] >> 24) & 0xff;	/* console hose # */
     79
     80		/*
     81		 * Our hose numbering DOES match the console's, so find
     82		 * the right one...
     83		 */
     84		for (hose = hose_head; hose; hose = hose->next) {
     85			if (hose->index == h) break;
     86		}
     87
     88		if (hose) {
     89			printk("Console graphics on hose %d\n", h);
     90			pci_vga_hose = hose;
     91		}
     92	}
     93}
     94
     95#endif