1 // SPDX-License-Identifier: GPL-2.0
3  * BIOS32 and PCI BIOS handling.
6 #include <linux/pci.h>
14 #include <asm/pci-functions.h>
20 /* PCI signature: "PCI " */
23 /* PCI service signature: "$PCI" */
26 /* PCI BIOS hardware mechanism flags */
38  * We could make the 0xe0000-0x100000 range rox, but this can break
48 	set_memory_x(PAGE_OFFSET + BIOS_BEGIN, (BIOS_END - BIOS_BEGIN) >> PAGE_SHIFT);  in set_bios_x()
50 		printk(KERN_INFO "PCI: PCI BIOS area is rw and x. Use pci=nobios if you want it NX.\n");  in set_bios_x()
56  * 	Standard BIOS 32-bit Service Directory Proposal
60  * and the PCI BIOS specification.
117 			printk(KERN_WARNING "bios32_service(0x%lx): returned 0x%x -- BIOS bug!\n",  in bios32_service()
163 		DBG("PCI: BIOS probe returned s=%02x hw=%02x ver=%02x.%02x l=%02x\n",  in check_pcibios()
166 			printk (KERN_ERR "PCI: BIOS BUG #%x[%08x] found\n",  in check_pcibios()
170 		printk(KERN_INFO "PCI: PCI BIOS revision %x.%02x entry at 0x%lx, last bus=%d\n",  in check_pcibios()
193 		return -EINVAL;  in pci_bios_read()
222 	 * Zero-extend the result beyond 8 or 16 bits, do not trust the  in pci_bios_read()
243 		return -EINVAL;  in pci_bios_write()
286  * Try to find PCI BIOS.
304 		long sig;  in pci_find_bios()  local
305 		if (get_kernel_nofault(sig, &check->fields.signature))  in pci_find_bios()
308 		if (check->fields.signature != BIOS32_SIGNATURE)  in pci_find_bios()
310 		length = check->fields.length * 16;  in pci_find_bios()
315 			sum += check->chars[i];  in pci_find_bios()
318 		if (check->fields.revision != 0) {  in pci_find_bios()
319 			printk("PCI: unsupported BIOS32 revision %d at 0x%p\n",  in pci_find_bios()
320 				check->fields.revision, check);  in pci_find_bios()
323 		DBG("PCI: BIOS32 Service Directory structure at 0x%p\n", check);  in pci_find_bios()
324 		if (check->fields.entry >= 0x100000) {  in pci_find_bios()
325 			printk("PCI: BIOS32 entry (0x%p) in high memory, "  in pci_find_bios()
329 			unsigned long bios32_entry = check->fields.entry;  in pci_find_bios()
330 			DBG("PCI: BIOS32 Service Directory entry at 0x%lx\n",  in pci_find_bios()
369 	DBG("PCI: Fetching IRQ routing table... ");  in pcibios_get_irq_routing_table()
389 		printk(KERN_ERR "PCI: Error %02x when fetching IRQ routing table.\n", (ret >> 8) & 0xff);  in pcibios_get_irq_routing_table()
394 			rt->size = opt.size + sizeof(struct irq_routing_table);  in pcibios_get_irq_routing_table()
395 			rt->exclusive_irqs = map;  in pcibios_get_irq_routing_table()
396 			memcpy(rt->slots, (void *) page, opt.size);  in pcibios_get_irq_routing_table()
397 			printk(KERN_INFO "PCI: Using BIOS Interrupt Routing Table\n");  in pcibios_get_irq_routing_table()
415 		  "b" ((dev->bus->number << 8) | dev->devfn),  in pcibios_set_irq_routing()