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vgapci: New vga_pci_repost() function

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This can be used to restore the VGA mode after a KMS driver is unloaded.

Differential Revision:	https://reviews.freebsd.org/D687
This commit is contained in:
dumbbell 2015-03-01 12:47:36 +00:00
parent f4b588d2fc
commit a8e8986092
2 changed files with 33 additions and 0 deletions
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1
sys/dev/pci/pcivar.h
View File

@ -591,5 +591,6 @@ struct pcicfg_vpd *pci_fetch_vpd_list(device_t dev);
int vga_pci_is_boot_display(device_t dev);
void * vga_pci_map_bios(device_t dev, size_t *size);
void vga_pci_unmap_bios(device_t dev, void *bios);
int vga_pci_repost(device_t dev);
#endif /* _PCIVAR_H_ */

32
sys/dev/pci/vga_pci.c
View File

@ -51,6 +51,8 @@ __FBSDID("$FreeBSD$");
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <compat/x86bios/x86bios.h> /* To re-POST the card. */
struct vga_resource {
struct resource *vr_res;
int vr_refs;
@ -194,6 +196,36 @@ vga_pci_unmap_bios(device_t dev, void *bios)
vr->vr_res);
}
int
vga_pci_repost(device_t dev)
{
#if defined(__amd64__) || defined(__i386__)
x86regs_t regs;
if (!vga_pci_is_boot_display(dev))
return (EINVAL);
if (x86bios_get_orm(VGA_PCI_BIOS_SHADOW_ADDR) == NULL)
return (ENOTSUP);
x86bios_init_regs(&regs);
regs.R_AH = pci_get_bus(dev);
regs.R_AL = (pci_get_slot(dev) << 3) | (pci_get_function(dev) & 0x07);
regs.R_DL = 0x80;
device_printf(dev, "REPOSTing\n");
x86bios_call(&regs, X86BIOS_PHYSTOSEG(VGA_PCI_BIOS_SHADOW_ADDR + 3),
X86BIOS_PHYSTOOFF(VGA_PCI_BIOS_SHADOW_ADDR + 3));
x86bios_get_intr(0x10);
return (0);
#else
return (ENOTSUP);
#endif
}
static int
vga_pci_probe(device_t dev)
{