2 * Copyright 2001-2003 SuSE Labs.
3 * Distributed under the GNU public license, v2.
5 * This is a GART driver for the AMD Opteron/Athlon64 on-CPU northbridge.
6 * It also includes support for the AMD 8151 AGP bridge,
7 * although it doesn't actually do much, as all the real
8 * work is done in the northbridge(s).
11 #include <linux/module.h>
12 #include <linux/pci.h>
13 #include <linux/init.h>
14 #include <linux/agp_backend.h>
15 #include <linux/mmzone.h>
16 #include <asm/page.h> /* PAGE_SIZE */
22 /* NVIDIA K8 registers */
23 #define NVIDIA_X86_64_0_APBASE 0x10
24 #define NVIDIA_X86_64_1_APBASE1 0x50
25 #define NVIDIA_X86_64_1_APLIMIT1 0x54
26 #define NVIDIA_X86_64_1_APSIZE 0xa8
27 #define NVIDIA_X86_64_1_APBASE2 0xd8
28 #define NVIDIA_X86_64_1_APLIMIT2 0xdc
30 /* ULi K8 registers */
31 #define ULI_X86_64_BASE_ADDR 0x10
32 #define ULI_X86_64_HTT_FEA_REG 0x50
33 #define ULI_X86_64_ENU_SCR_REG 0x54
35 static struct resource *aperture_resource;
36 static int __initdata agp_try_unsupported = 1;
38 static void amd64_tlbflush(struct agp_memory *temp)
43 static int amd64_insert_memory(struct agp_memory *mem, off_t pg_start, int type)
45 int i, j, num_entries;
48 struct agp_bridge_data *bridge = mem->bridge;
51 num_entries = agp_num_entries();
53 if (type != mem->type)
55 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
60 /* Make sure we can fit the range in the gatt table. */
61 /* FIXME: could wrap */
62 if (((unsigned long)pg_start + mem->page_count) > num_entries)
67 /* gatt table should be empty. */
68 while (j < (pg_start + mem->page_count)) {
69 if (!PGE_EMPTY(agp_bridge, readl(agp_bridge->gatt_table+j)))
74 if (mem->is_flushed == FALSE) {
76 mem->is_flushed = TRUE;
79 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
80 tmp = agp_bridge->driver->mask_memory(agp_bridge,
81 mem->memory[i], mask_type);
83 BUG_ON(tmp & 0xffffff0000000ffcULL);
84 pte = (tmp & 0x000000ff00000000ULL) >> 28;
85 pte |=(tmp & 0x00000000fffff000ULL);
86 pte |= GPTE_VALID | GPTE_COHERENT;
88 writel(pte, agp_bridge->gatt_table+j);
89 readl(agp_bridge->gatt_table+j); /* PCI Posting. */
96 * This hack alters the order element according
97 * to the size of a long. It sucks. I totally disown this, even
98 * though it does appear to work for the most part.
100 static struct aper_size_info_32 amd64_aperture_sizes[7] =
102 {32, 8192, 3+(sizeof(long)/8), 0 },
103 {64, 16384, 4+(sizeof(long)/8), 1<<1 },
104 {128, 32768, 5+(sizeof(long)/8), 1<<2 },
105 {256, 65536, 6+(sizeof(long)/8), 1<<1 | 1<<2 },
106 {512, 131072, 7+(sizeof(long)/8), 1<<3 },
107 {1024, 262144, 8+(sizeof(long)/8), 1<<1 | 1<<3},
108 {2048, 524288, 9+(sizeof(long)/8), 1<<2 | 1<<3}
113 * Get the current Aperture size from the x86-64.
114 * Note, that there may be multiple x86-64's, but we just return
115 * the value from the first one we find. The set_size functions
116 * keep the rest coherent anyway. Or at least should do.
118 static int amd64_fetch_size(void)
123 struct aper_size_info_32 *values;
125 dev = k8_northbridges[0];
129 pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &temp);
131 values = A_SIZE_32(amd64_aperture_sizes);
133 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
134 if (temp == values[i].size_value) {
135 agp_bridge->previous_size =
136 agp_bridge->current_size = (void *) (values + i);
138 agp_bridge->aperture_size_idx = i;
139 return values[i].size;
146 * In a multiprocessor x86-64 system, this function gets
147 * called once for each CPU.
149 static u64 amd64_configure(struct pci_dev *hammer, u64 gatt_table)
155 /* Address to map to */
156 pci_read_config_dword (hammer, AMD64_GARTAPERTUREBASE, &tmp);
157 aperturebase = tmp << 25;
158 aper_base = (aperturebase & PCI_BASE_ADDRESS_MEM_MASK);
160 /* address of the mappings table */
161 addr = (u64) gatt_table;
165 pci_write_config_dword(hammer, AMD64_GARTTABLEBASE, tmp);
167 /* Enable GART translation for this hammer. */
168 pci_read_config_dword(hammer, AMD64_GARTAPERTURECTL, &tmp);
170 tmp &= ~(DISGARTCPU | DISGARTIO);
171 pci_write_config_dword(hammer, AMD64_GARTAPERTURECTL, tmp);
177 static const struct aper_size_info_32 amd_8151_sizes[7] =
179 {2048, 524288, 9, 0x00000000 }, /* 0 0 0 0 0 0 */
180 {1024, 262144, 8, 0x00000400 }, /* 1 0 0 0 0 0 */
181 {512, 131072, 7, 0x00000600 }, /* 1 1 0 0 0 0 */
182 {256, 65536, 6, 0x00000700 }, /* 1 1 1 0 0 0 */
183 {128, 32768, 5, 0x00000720 }, /* 1 1 1 1 0 0 */
184 {64, 16384, 4, 0x00000730 }, /* 1 1 1 1 1 0 */
185 {32, 8192, 3, 0x00000738 } /* 1 1 1 1 1 1 */
188 static int amd_8151_configure(void)
190 unsigned long gatt_bus = virt_to_gart(agp_bridge->gatt_table_real);
193 /* Configure AGP regs in each x86-64 host bridge. */
194 for (i = 0; i < num_k8_northbridges; i++) {
195 agp_bridge->gart_bus_addr =
196 amd64_configure(k8_northbridges[i], gatt_bus);
203 static void amd64_cleanup(void)
207 for (i = 0; i < num_k8_northbridges; i++) {
208 struct pci_dev *dev = k8_northbridges[i];
209 /* disable gart translation */
210 pci_read_config_dword (dev, AMD64_GARTAPERTURECTL, &tmp);
211 tmp &= ~AMD64_GARTEN;
212 pci_write_config_dword (dev, AMD64_GARTAPERTURECTL, tmp);
217 static const struct agp_bridge_driver amd_8151_driver = {
218 .owner = THIS_MODULE,
219 .aperture_sizes = amd_8151_sizes,
220 .size_type = U32_APER_SIZE,
221 .num_aperture_sizes = 7,
222 .configure = amd_8151_configure,
223 .fetch_size = amd64_fetch_size,
224 .cleanup = amd64_cleanup,
225 .tlb_flush = amd64_tlbflush,
226 .mask_memory = agp_generic_mask_memory,
228 .agp_enable = agp_generic_enable,
229 .cache_flush = global_cache_flush,
230 .create_gatt_table = agp_generic_create_gatt_table,
231 .free_gatt_table = agp_generic_free_gatt_table,
232 .insert_memory = amd64_insert_memory,
233 .remove_memory = agp_generic_remove_memory,
234 .alloc_by_type = agp_generic_alloc_by_type,
235 .free_by_type = agp_generic_free_by_type,
236 .agp_alloc_page = agp_generic_alloc_page,
237 .agp_destroy_page = agp_generic_destroy_page,
238 .agp_type_to_mask_type = agp_generic_type_to_mask_type,
241 /* Some basic sanity checks for the aperture. */
242 static int __devinit aperture_valid(u64 aper, u32 size)
245 printk(KERN_ERR PFX "No aperture\n");
248 if (size < 32*1024*1024) {
249 printk(KERN_ERR PFX "Aperture too small (%d MB)\n", size>>20);
252 if ((u64)aper + size > 0x100000000ULL) {
253 printk(KERN_ERR PFX "Aperture out of bounds\n");
256 if (e820_any_mapped(aper, aper + size, E820_RAM)) {
257 printk(KERN_ERR PFX "Aperture pointing to RAM\n");
261 /* Request the Aperture. This catches cases when someone else
262 already put a mapping in there - happens with some very broken BIOS
264 Maybe better to use pci_assign_resource/pci_enable_device instead
265 trusting the bridges? */
266 if (!aperture_resource &&
267 !(aperture_resource = request_mem_region(aper, size, "aperture"))) {
268 printk(KERN_ERR PFX "Aperture conflicts with PCI mapping.\n");
275 * W*s centric BIOS sometimes only set up the aperture in the AGP
276 * bridge, not the northbridge. On AMD64 this is handled early
277 * in aperture.c, but when IOMMU is not enabled or we run
278 * on a 32bit kernel this needs to be redone.
279 * Unfortunately it is impossible to fix the aperture here because it's too late
280 * to allocate that much memory. But at least error out cleanly instead of
283 static __devinit int fix_northbridge(struct pci_dev *nb, struct pci_dev *agp,
286 u32 aper_low, aper_hi;
289 u32 nb_order, nb_base;
292 pci_read_config_dword(nb, 0x90, &nb_order);
293 nb_order = (nb_order >> 1) & 7;
294 pci_read_config_dword(nb, 0x94, &nb_base);
295 nb_aper = nb_base << 25;
296 if (aperture_valid(nb_aper, (32*1024*1024)<<nb_order)) {
300 /* Northbridge seems to contain crap. Try the AGP bridge. */
302 pci_read_config_word(agp, cap+0x14, &apsize);
303 if (apsize == 0xffff)
307 /* Some BIOS use weird encodings not in the AGPv3 table. */
310 order = 7 - hweight16(apsize);
312 pci_read_config_dword(agp, 0x10, &aper_low);
313 pci_read_config_dword(agp, 0x14, &aper_hi);
314 aper = (aper_low & ~((1<<22)-1)) | ((u64)aper_hi << 32);
317 * On some sick chips APSIZE is 0. This means it wants 4G
318 * so let double check that order, and lets trust the AMD NB settings
320 if (aper + (32ULL<<(20 + order)) > 0x100000000ULL) {
321 printk(KERN_INFO "Aperture size %u MB is not right, using settings from NB\n",
326 printk(KERN_INFO PFX "Aperture from AGP @ %Lx size %u MB\n", aper, 32 << order);
327 if (order < 0 || !aperture_valid(aper, (32*1024*1024)<<order))
330 pci_write_config_dword(nb, 0x90, order << 1);
331 pci_write_config_dword(nb, 0x94, aper >> 25);
336 static __devinit int cache_nbs (struct pci_dev *pdev, u32 cap_ptr)
340 if (cache_k8_northbridges() < 0)
344 for (i = 0; i < num_k8_northbridges; i++) {
345 struct pci_dev *dev = k8_northbridges[i];
346 if (fix_northbridge(dev, pdev, cap_ptr) < 0) {
347 printk(KERN_ERR PFX "No usable aperture found.\n");
349 /* should port this to i386 */
350 printk(KERN_ERR PFX "Consider rebooting with iommu=memaper=2 to get a good aperture.\n");
358 /* Handle AMD 8151 quirks */
359 static void __devinit amd8151_init(struct pci_dev *pdev, struct agp_bridge_data *bridge)
363 switch (pdev->revision) {
364 case 0x01: revstring="A0"; break;
365 case 0x02: revstring="A1"; break;
366 case 0x11: revstring="B0"; break;
367 case 0x12: revstring="B1"; break;
368 case 0x13: revstring="B2"; break;
369 case 0x14: revstring="B3"; break;
370 default: revstring="??"; break;
373 printk (KERN_INFO PFX "Detected AMD 8151 AGP Bridge rev %s\n", revstring);
376 * Work around errata.
377 * Chips before B2 stepping incorrectly reporting v3.5
379 if (pdev->revision < 0x13) {
380 printk (KERN_INFO PFX "Correcting AGP revision (reports 3.5, is really 3.0)\n");
381 bridge->major_version = 3;
382 bridge->minor_version = 0;
387 static const struct aper_size_info_32 uli_sizes[7] =
397 static int __devinit uli_agp_init(struct pci_dev *pdev)
399 u32 httfea,baseaddr,enuscr;
400 struct pci_dev *dev1;
402 unsigned size = amd64_fetch_size();
403 printk(KERN_INFO "Setting up ULi AGP.\n");
404 dev1 = pci_get_slot (pdev->bus,PCI_DEVFN(0,0));
406 printk(KERN_INFO PFX "Detected a ULi chipset, "
407 "but could not fine the secondary device.\n");
411 for (i = 0; i < ARRAY_SIZE(uli_sizes); i++)
412 if (uli_sizes[i].size == size)
415 if (i == ARRAY_SIZE(uli_sizes)) {
416 printk(KERN_INFO PFX "No ULi size found for %d\n", size);
420 /* shadow x86-64 registers into ULi registers */
421 pci_read_config_dword (k8_northbridges[0], AMD64_GARTAPERTUREBASE, &httfea);
423 /* if x86-64 aperture base is beyond 4G, exit here */
424 if ((httfea & 0x7fff) >> (32 - 25))
427 httfea = (httfea& 0x7fff) << 25;
429 pci_read_config_dword(pdev, ULI_X86_64_BASE_ADDR, &baseaddr);
430 baseaddr&= ~PCI_BASE_ADDRESS_MEM_MASK;
432 pci_write_config_dword(pdev, ULI_X86_64_BASE_ADDR, baseaddr);
434 enuscr= httfea+ (size * 1024 * 1024) - 1;
435 pci_write_config_dword(dev1, ULI_X86_64_HTT_FEA_REG, httfea);
436 pci_write_config_dword(dev1, ULI_X86_64_ENU_SCR_REG, enuscr);
443 static const struct aper_size_info_32 nforce3_sizes[5] =
445 {512, 131072, 7, 0x00000000 },
446 {256, 65536, 6, 0x00000008 },
447 {128, 32768, 5, 0x0000000C },
448 {64, 16384, 4, 0x0000000E },
449 {32, 8192, 3, 0x0000000F }
452 /* Handle shadow device of the Nvidia NForce3 */
453 /* CHECK-ME original 2.4 version set up some IORRs. Check if that is needed. */
454 static int nforce3_agp_init(struct pci_dev *pdev)
456 u32 tmp, apbase, apbar, aplimit;
457 struct pci_dev *dev1;
459 unsigned size = amd64_fetch_size();
461 printk(KERN_INFO PFX "Setting up Nforce3 AGP.\n");
463 dev1 = pci_get_slot(pdev->bus, PCI_DEVFN(11, 0));
465 printk(KERN_INFO PFX "agpgart: Detected an NVIDIA "
466 "nForce3 chipset, but could not find "
467 "the secondary device.\n");
471 for (i = 0; i < ARRAY_SIZE(nforce3_sizes); i++)
472 if (nforce3_sizes[i].size == size)
475 if (i == ARRAY_SIZE(nforce3_sizes)) {
476 printk(KERN_INFO PFX "No NForce3 size found for %d\n", size);
480 pci_read_config_dword(dev1, NVIDIA_X86_64_1_APSIZE, &tmp);
482 tmp |= nforce3_sizes[i].size_value;
483 pci_write_config_dword(dev1, NVIDIA_X86_64_1_APSIZE, tmp);
485 /* shadow x86-64 registers into NVIDIA registers */
486 pci_read_config_dword (k8_northbridges[0], AMD64_GARTAPERTUREBASE, &apbase);
488 /* if x86-64 aperture base is beyond 4G, exit here */
489 if ( (apbase & 0x7fff) >> (32 - 25) ) {
490 printk(KERN_INFO PFX "aperture base > 4G\n");
494 apbase = (apbase & 0x7fff) << 25;
496 pci_read_config_dword(pdev, NVIDIA_X86_64_0_APBASE, &apbar);
497 apbar &= ~PCI_BASE_ADDRESS_MEM_MASK;
499 pci_write_config_dword(pdev, NVIDIA_X86_64_0_APBASE, apbar);
501 aplimit = apbase + (size * 1024 * 1024) - 1;
502 pci_write_config_dword(dev1, NVIDIA_X86_64_1_APBASE1, apbase);
503 pci_write_config_dword(dev1, NVIDIA_X86_64_1_APLIMIT1, aplimit);
504 pci_write_config_dword(dev1, NVIDIA_X86_64_1_APBASE2, apbase);
505 pci_write_config_dword(dev1, NVIDIA_X86_64_1_APLIMIT2, aplimit);
512 static int __devinit agp_amd64_probe(struct pci_dev *pdev,
513 const struct pci_device_id *ent)
515 struct agp_bridge_data *bridge;
518 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
522 /* Could check for AGPv3 here */
524 bridge = agp_alloc_bridge();
528 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
529 pdev->device == PCI_DEVICE_ID_AMD_8151_0) {
530 amd8151_init(pdev, bridge);
532 printk(KERN_INFO PFX "Detected AGP bridge %x\n", pdev->devfn);
535 bridge->driver = &amd_8151_driver;
537 bridge->capndx = cap_ptr;
539 /* Fill in the mode register */
540 pci_read_config_dword(pdev, bridge->capndx+PCI_AGP_STATUS, &bridge->mode);
542 if (cache_nbs(pdev, cap_ptr) == -1) {
543 agp_put_bridge(bridge);
547 if (pdev->vendor == PCI_VENDOR_ID_NVIDIA) {
548 int ret = nforce3_agp_init(pdev);
550 agp_put_bridge(bridge);
555 if (pdev->vendor == PCI_VENDOR_ID_AL) {
556 int ret = uli_agp_init(pdev);
558 agp_put_bridge(bridge);
563 pci_set_drvdata(pdev, bridge);
564 return agp_add_bridge(bridge);
567 static void __devexit agp_amd64_remove(struct pci_dev *pdev)
569 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
571 release_mem_region(virt_to_gart(bridge->gatt_table_real),
572 amd64_aperture_sizes[bridge->aperture_size_idx].size);
573 agp_remove_bridge(bridge);
574 agp_put_bridge(bridge);
579 static int agp_amd64_suspend(struct pci_dev *pdev, pm_message_t state)
581 pci_save_state(pdev);
582 pci_set_power_state(pdev, pci_choose_state(pdev, state));
587 static int agp_amd64_resume(struct pci_dev *pdev)
589 pci_set_power_state(pdev, PCI_D0);
590 pci_restore_state(pdev);
592 if (pdev->vendor == PCI_VENDOR_ID_NVIDIA)
593 nforce3_agp_init(pdev);
595 return amd_8151_configure();
598 #endif /* CONFIG_PM */
600 static struct pci_device_id agp_amd64_pci_table[] = {
602 .class = (PCI_CLASS_BRIDGE_HOST << 8),
604 .vendor = PCI_VENDOR_ID_AMD,
605 .device = PCI_DEVICE_ID_AMD_8151_0,
606 .subvendor = PCI_ANY_ID,
607 .subdevice = PCI_ANY_ID,
611 .class = (PCI_CLASS_BRIDGE_HOST << 8),
613 .vendor = PCI_VENDOR_ID_AL,
614 .device = PCI_DEVICE_ID_AL_M1689,
615 .subvendor = PCI_ANY_ID,
616 .subdevice = PCI_ANY_ID,
620 .class = (PCI_CLASS_BRIDGE_HOST << 8),
622 .vendor = PCI_VENDOR_ID_VIA,
623 .device = PCI_DEVICE_ID_VIA_K8T800PRO_0,
624 .subvendor = PCI_ANY_ID,
625 .subdevice = PCI_ANY_ID,
629 .class = (PCI_CLASS_BRIDGE_HOST << 8),
631 .vendor = PCI_VENDOR_ID_VIA,
632 .device = PCI_DEVICE_ID_VIA_8385_0,
633 .subvendor = PCI_ANY_ID,
634 .subdevice = PCI_ANY_ID,
636 /* VIA K8M800 / K8N800 */
638 .class = (PCI_CLASS_BRIDGE_HOST << 8),
640 .vendor = PCI_VENDOR_ID_VIA,
641 .device = PCI_DEVICE_ID_VIA_8380_0,
642 .subvendor = PCI_ANY_ID,
643 .subdevice = PCI_ANY_ID,
645 /* VIA K8M890 / K8N890 */
647 .class = (PCI_CLASS_BRIDGE_HOST << 8),
649 .vendor = PCI_VENDOR_ID_VIA,
650 .device = PCI_DEVICE_ID_VIA_VT3336,
651 .subvendor = PCI_ANY_ID,
652 .subdevice = PCI_ANY_ID,
656 .class = (PCI_CLASS_BRIDGE_HOST << 8),
658 .vendor = PCI_VENDOR_ID_VIA,
659 .device = PCI_DEVICE_ID_VIA_3238_0,
660 .subvendor = PCI_ANY_ID,
661 .subdevice = PCI_ANY_ID,
663 /* VIA K8T800/K8M800/K8N800 */
665 .class = (PCI_CLASS_BRIDGE_HOST << 8),
667 .vendor = PCI_VENDOR_ID_VIA,
668 .device = PCI_DEVICE_ID_VIA_838X_1,
669 .subvendor = PCI_ANY_ID,
670 .subdevice = PCI_ANY_ID,
674 .class = (PCI_CLASS_BRIDGE_HOST << 8),
676 .vendor = PCI_VENDOR_ID_NVIDIA,
677 .device = PCI_DEVICE_ID_NVIDIA_NFORCE3,
678 .subvendor = PCI_ANY_ID,
679 .subdevice = PCI_ANY_ID,
682 .class = (PCI_CLASS_BRIDGE_HOST << 8),
684 .vendor = PCI_VENDOR_ID_NVIDIA,
685 .device = PCI_DEVICE_ID_NVIDIA_NFORCE3S,
686 .subvendor = PCI_ANY_ID,
687 .subdevice = PCI_ANY_ID,
691 .class = (PCI_CLASS_BRIDGE_HOST << 8),
693 .vendor = PCI_VENDOR_ID_SI,
694 .device = PCI_DEVICE_ID_SI_755,
695 .subvendor = PCI_ANY_ID,
696 .subdevice = PCI_ANY_ID,
700 .class = (PCI_CLASS_BRIDGE_HOST << 8),
702 .vendor = PCI_VENDOR_ID_SI,
703 .device = PCI_DEVICE_ID_SI_760,
704 .subvendor = PCI_ANY_ID,
705 .subdevice = PCI_ANY_ID,
709 .class = (PCI_CLASS_BRIDGE_HOST << 8),
711 .vendor = PCI_VENDOR_ID_AL,
713 .subvendor = PCI_ANY_ID,
714 .subdevice = PCI_ANY_ID,
720 MODULE_DEVICE_TABLE(pci, agp_amd64_pci_table);
722 static struct pci_driver agp_amd64_pci_driver = {
723 .name = "agpgart-amd64",
724 .id_table = agp_amd64_pci_table,
725 .probe = agp_amd64_probe,
726 .remove = agp_amd64_remove,
728 .suspend = agp_amd64_suspend,
729 .resume = agp_amd64_resume,
734 /* Not static due to IOMMU code calling it early. */
735 int __init agp_amd64_init(void)
741 if (pci_register_driver(&agp_amd64_pci_driver) < 0) {
743 if (!agp_try_unsupported && !agp_try_unsupported_boot) {
744 printk(KERN_INFO PFX "No supported AGP bridge found.\n");
746 printk(KERN_INFO PFX "You can try agp_try_unsupported=1\n");
748 printk(KERN_INFO PFX "You can boot with agp=try_unsupported\n");
753 /* First check that we have at least one AMD64 NB */
754 if (!pci_dev_present(k8_nb_ids))
757 /* Look for any AGP bridge */
760 for_each_pci_dev(dev) {
761 if (!pci_find_capability(dev, PCI_CAP_ID_AGP))
763 /* Only one bridge supported right now */
764 if (agp_amd64_probe(dev, NULL) == 0) {
773 static void __exit agp_amd64_cleanup(void)
775 if (aperture_resource)
776 release_resource(aperture_resource);
777 pci_unregister_driver(&agp_amd64_pci_driver);
780 /* On AMD64 the PCI driver needs to initialize this driver early
781 for the IOMMU, so it has to be called via a backdoor. */
782 #ifndef CONFIG_GART_IOMMU
783 module_init(agp_amd64_init);
784 module_exit(agp_amd64_cleanup);
787 MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>, Andi Kleen");
788 module_param(agp_try_unsupported, bool, 0);
789 MODULE_LICENSE("GPL");