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/******************************************************************************
* vga.c
*
* VGA support routines.
*/
#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/mm.h>
#include <xen/vga.h>
#include <xen/pci.h>
#include <asm/io.h>
/* Filled in by arch boot code. */
struct xen_vga_console_info vga_console_info;
static int vgacon_keep;
static unsigned int xpos, ypos;
static unsigned char *video;
static void vga_text_puts(const char *s);
static void vga_noop_puts(const char *s) {}
void (*video_puts)(const char *) = vga_noop_puts;
/*
* 'vga=<mode-specifier>[,keep]' where <mode-specifier> is one of:
*
* 'vga=ask':
* display a vga menu of available modes
*
* 'vga=current':
* use the current vga mode without modification
*
* 'vga=text-80x<rows>':
* text mode, where <rows> is one of {25,28,30,34,43,50,60}
*
* 'vga=gfx-<width>x<height>x<depth>':
* graphics mode, e.g., vga=gfx-1024x768x16
*
* 'vga=mode-<mode>:
* specifies a mode as specified in 'vga=ask' menu
* (NB. menu modes are displayed in hex, so mode numbers here must
* be prefixed with '0x' (e.g., 'vga=mode-0x0318'))
*
* The option 'keep' causes Xen to continue to print to the VGA console even
* after domain 0 starts to boot. The default behaviour is to relinquish
* control of the console to domain 0.
*/
static char __initdata opt_vga[30] = "";
string_param("vga", opt_vga);
/* VGA text-mode definitions. */
static unsigned int columns, lines;
#define ATTRIBUTE 7
#ifdef CONFIG_X86
void vesa_early_init(void);
void vesa_endboot(bool_t keep);
#else
#define vesa_early_init() ((void)0)
#define vesa_endboot(x) ((void)0)
#endif
void __init video_init(void)
{
char *p;
/* Look for 'keep' in comma-separated options. */
for ( p = opt_vga; p != NULL; p = strchr(p, ',') )
{
if ( *p == ',' )
p++;
if ( strncmp(p, "keep", 4) == 0 )
vgacon_keep = 1;
}
switch ( vga_console_info.video_type )
{
case XEN_VGATYPE_TEXT_MODE_3:
if ( page_is_ram_type(paddr_to_pfn(0xB8000), RAM_TYPE_CONVENTIONAL) ||
((video = ioremap(0xB8000, 0x8000)) == NULL) )
return;
outw(0x200a, 0x3d4); /* disable cursor */
columns = vga_console_info.u.text_mode_3.columns;
lines = vga_console_info.u.text_mode_3.rows;
memset(video, 0, columns * lines * 2);
video_puts = vga_text_puts;
break;
case XEN_VGATYPE_VESA_LFB:
case XEN_VGATYPE_EFI_LFB:
vesa_early_init();
break;
default:
memset(&vga_console_info, 0, sizeof(vga_console_info));
break;
}
}
void __init video_endboot(void)
{
if ( video_puts == vga_noop_puts )
return;
printk("Xen is %s VGA console.\n",
vgacon_keep ? "keeping" : "relinquishing");
if ( !vgacon_keep )
video_puts = vga_noop_puts;
else
{
int bus, devfn;
for ( bus = 0; bus < 256; ++bus )
for ( devfn = 0; devfn < 256; ++devfn )
{
const struct pci_dev *pdev;
u8 b = bus, df = devfn, sb;
spin_lock(&pcidevs_lock);
pdev = pci_get_pdev(0, bus, devfn);
spin_unlock(&pcidevs_lock);
if ( !pdev ||
pci_conf_read16(0, bus, PCI_SLOT(devfn), PCI_FUNC(devfn),
PCI_CLASS_DEVICE) != 0x0300 ||
!(pci_conf_read16(0, bus, PCI_SLOT(devfn),
PCI_FUNC(devfn), PCI_COMMAND) &
(PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) )
continue;
while ( b )
{
switch ( find_upstream_bridge(0, &b, &df, &sb) )
{
case 0:
b = 0;
break;
case 1:
switch ( pci_conf_read8(0, b, PCI_SLOT(df),
PCI_FUNC(df),
PCI_HEADER_TYPE) )
{
case PCI_HEADER_TYPE_BRIDGE:
case PCI_HEADER_TYPE_CARDBUS:
if ( pci_conf_read16(0, b, PCI_SLOT(df),
PCI_FUNC(df),
PCI_BRIDGE_CONTROL) &
PCI_BRIDGE_CTL_VGA )
continue;
break;
}
break;
}
break;
}
if ( !b )
{
printk(XENLOG_INFO "Boot video device %02x:%02x.%u\n",
bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
pci_hide_device(bus, devfn);
}
}
}
switch ( vga_console_info.video_type )
{
case XEN_VGATYPE_TEXT_MODE_3:
if ( !vgacon_keep )
memset(video, 0, columns * lines * 2);
break;
case XEN_VGATYPE_VESA_LFB:
case XEN_VGATYPE_EFI_LFB:
vesa_endboot(vgacon_keep);
break;
default:
BUG();
}
}
static void vga_text_puts(const char *s)
{
char c;
while ( (c = *s++) != '\0' )
{
if ( (c == '\n') || (xpos >= columns) )
{
if ( ++ypos >= lines )
{
ypos = lines - 1;
memmove(video, video + 2 * columns, ypos * 2 * columns);
memset(video + ypos * 2 * columns, 0, 2 * xpos);
}
xpos = 0;
}
if ( c != '\n' )
{
video[(xpos + ypos * columns) * 2] = c;
video[(xpos + ypos * columns) * 2 + 1] = ATTRIBUTE;
xpos++;
}
}
}
int __init fill_console_start_info(struct dom0_vga_console_info *ci)
{
memcpy(ci, &vga_console_info, sizeof(*ci));
return 1;
}
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