mirror of https://gitee.com/openkylin/linux.git
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*
|
|
* linux/arch/alpha/kernel/console.c
|
|
*
|
|
* Architecture-specific specific support for VGA device on
|
|
* non-0 I/O hose
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/init.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/console.h>
|
|
#include <asm/vga.h>
|
|
#include <asm/machvec.h>
|
|
|
|
#ifdef CONFIG_VGA_HOSE
|
|
|
|
/*
|
|
* Externally-visible vga hose bases
|
|
*/
|
|
unsigned long __vga_hose_io_base = 0; /* base for default hose */
|
|
unsigned long __vga_hose_mem_base = 0; /* base for default hose */
|
|
|
|
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
|
|
set_vga_hose(struct pci_controller *hose)
|
|
{
|
|
if (hose) {
|
|
__vga_hose_io_base = hose->io_space->start;
|
|
__vga_hose_mem_base = hose->mem_space->start;
|
|
}
|
|
}
|
|
|
|
void __init
|
|
locate_and_init_vga(void *(*sel_func)(void *, void *))
|
|
{
|
|
struct pci_controller *hose = NULL;
|
|
struct pci_dev *dev = NULL;
|
|
|
|
if (!sel_func) sel_func = (void *)default_vga_hose_select;
|
|
|
|
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 inititialize the correct one? */
|
|
if (conswitchp == &vga_con &&
|
|
__vga_hose_io_base == hose->io_space->start &&
|
|
__vga_hose_mem_base == hose->mem_space->start)
|
|
return;
|
|
|
|
/* Set the VGA hose and init the new console */
|
|
set_vga_hose(hose);
|
|
take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1);
|
|
}
|
|
|
|
#endif
|