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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697// 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