Rewrite x86bios and update its dependent drivers.

- Do not map entire real mode memory (1MB).  Instead, we map IVT/BDA and
ROM area separately.  Most notably, ROM area is mapped as device memory
(uncacheable) as it should be.  User memory is dynamically allocated and
free'ed with contigmalloc(9) and contigfree(9).  Remove now redundant and
potentially dangerous x86bios_alloc.c.  If this emulator ever grows to
support non-PC hardware, we may implement it with rman(9) later.
- Move all host-specific initializations from x86emu_util.c to x86bios.c and
remove now unnecessary x86emu_util.c.  Currently, non-PC hardware is not
supported.  We may use bus_space(9) later when the KPI is fixed.
- Replace all bzero() calls for emulated registers with more obviously named
x86bios_init_regs().  This function also initializes DS and SS properly.
- Add x86bios_get_intr().  This function checks if the interrupt vector is
available for the platform.  It is not necessary for PC-compatible hardware
but it may be needed later. ;-)
- Do not try turning off monitor if DPMS does not support the state.
- Allocate stable memory for VESA OEM strings instead of just holding
pointers to them.  They may or may not be accessible always.  Fix a memory
leak of video mode table while I am here.
- Add (experimental) BIOS POST call for vesa(4).  This function calls VGA
BIOS POST code from the current VGA option ROM.  Some video controllers
cannot save and restore the state properly even if it is claimed to be
supported.  Usually the symptom is blank display after resuming from suspend
state.  If the video mode does not match the previous mode after restoring,
we try BIOS POST and force the known good initial state.  Some magic was
taken from NetBSD (and it was taken from vbetool, I believe.)
- Add a loader tunable for vgapci(4) to give a hint to dpms(4) and vesa(4)
to identify who owns the VESA BIOS.  This is very useful for multi-display
adapter setup.  By default, the POST video controller is automatically
probed and the tunable "hw.pci.default_vgapci_unit" is set to corresponding
vgapci unit number.  You may override it from loader but it is very unlikely
to be necessary.  Unfortunately only AGP/PCI/PCI-E controllers can be
matched because ISA controller does not have necessary device IDs.
- Fix a long standing bug in state save/restore function.  The state buffer
pointer should be ES:BX, not ES:DI according to VBE 3.0.  If it ever worked,
that's because BX was always zero. :-)
- Clean up register initializations more clearer per VBE 3.0.
- Fix a lot of style issues with vesa(4).

1 files changed, 21 insertions, 0 deletions

diff --git a/sys/dev/pci/vga_pci.c b/sys/dev/pci/vga_pci.c
index 3e5b1a6..1467bbd 100644
--- a/sys/dev/pci/vga_pci.c
+++ b/sys/dev/pci/vga_pci.c
@@ -43,6 +43,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/kernel.h>
 #include <sys/module.h>
 #include <sys/rman.h>
+#include <sys/sysctl.h>
 #include <sys/systm.h>
 
 #include <dev/pci/pcireg.h>
@@ -58,9 +59,19 @@ struct vga_pci_softc {
 	struct vga_resource vga_res[PCIR_MAX_BAR_0 + 1];
 };
 
+SYSCTL_DECL(_hw_pci);
+
+int vga_pci_default_unit = -1;
+TUNABLE_INT("hw.pci.default_vgapci_unit", &vga_pci_default_unit);
+SYSCTL_INT(_hw_pci, OID_AUTO, default_vgapci_unit, CTLFLAG_RD,
+    &vga_pci_default_unit, -1, "Default VGA-compatible display");
+
 static int
 vga_pci_probe(device_t dev)
 {
+	device_t bdev;
+	int unit;
+	uint16_t bctl;
 
 	switch (pci_get_class(dev)) {
 	case PCIC_DISPLAY:
@@ -72,6 +83,16 @@ vga_pci_probe(device_t dev)
 	default:
 		return (ENXIO);
 	}
+
+	/* Probe default display. */
+	unit = device_get_unit(dev);
+	bdev = device_get_parent(device_get_parent(dev));
+	bctl = pci_read_config(bdev, PCIR_BRIDGECTL_1, 2);
+	if (vga_pci_default_unit < 0 && (bctl & PCIB_BCR_VGA_ENABLE) != 0)
+		vga_pci_default_unit = unit;
+	if (vga_pci_default_unit == unit)
+		device_set_flags(dev, 1);
+
 	device_set_desc(dev, "VGA-compatible display");
 	return (BUS_PROBE_GENERIC);
 }