1 #include <linux/sched.h>
3 #include <linux/uaccess.h>
4 #include <linux/mmzone.h>
5 #include <linux/ioport.h>
6 #include <linux/seq_file.h>
7 #include <linux/console.h>
8 #include <linux/init.h>
10 #include <linux/dmi.h>
11 #include <linux/pfn.h>
12 #include <linux/pci.h>
13 #include <linux/export.h>
15 #include <asm/probe_roms.h>
16 #include <asm/pci-direct.h>
18 #include <asm/mmzone.h>
19 #include <asm/setup.h>
20 #include <asm/sections.h>
22 #include <asm/setup_arch.h>
24 static struct resource system_rom_resource = {
28 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
31 static struct resource extension_rom_resource = {
32 .name = "Extension ROM",
35 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
38 static struct resource adapter_rom_resources[] = { {
39 .name = "Adapter ROM",
42 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
44 .name = "Adapter ROM",
47 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
49 .name = "Adapter ROM",
52 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
54 .name = "Adapter ROM",
57 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
59 .name = "Adapter ROM",
62 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
64 .name = "Adapter ROM",
67 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
70 static struct resource video_rom_resource = {
74 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
77 /* does this oprom support the given pci device, or any of the devices
78 * that the driver supports?
80 static bool match_id(struct pci_dev *pdev, unsigned short vendor, unsigned short device)
82 struct pci_driver *drv = pdev->driver;
83 const struct pci_device_id *id;
85 if (pdev->vendor == vendor && pdev->device == device)
88 for (id = drv ? drv->id_table : NULL; id && id->vendor; id++)
89 if (id->vendor == vendor && id->device == device)
92 return id && id->vendor;
95 static bool probe_list(struct pci_dev *pdev, unsigned short vendor,
96 const unsigned char *rom_list)
98 unsigned short device;
101 if (probe_kernel_address(rom_list, device) != 0)
104 if (device && match_id(pdev, vendor, device))
113 static struct resource *find_oprom(struct pci_dev *pdev)
115 struct resource *oprom = NULL;
119 if (!is_initial_xendomain())
123 for (i = 0; i < ARRAY_SIZE(adapter_rom_resources); i++) {
124 struct resource *res = &adapter_rom_resources[i];
125 unsigned short offset, vendor, device, list, rev;
126 const unsigned char *rom;
131 rom = isa_bus_to_virt(res->start);
132 if (probe_kernel_address(rom + 0x18, offset) != 0)
135 if (probe_kernel_address(rom + offset + 0x4, vendor) != 0)
138 if (probe_kernel_address(rom + offset + 0x6, device) != 0)
141 if (match_id(pdev, vendor, device)) {
146 if (probe_kernel_address(rom + offset + 0x8, list) == 0 &&
147 probe_kernel_address(rom + offset + 0xc, rev) == 0 &&
149 probe_list(pdev, vendor, rom + offset + list)) {
158 void *pci_map_biosrom(struct pci_dev *pdev)
160 struct resource *oprom = find_oprom(pdev);
165 return ioremap(oprom->start, resource_size(oprom));
167 EXPORT_SYMBOL(pci_map_biosrom);
169 void pci_unmap_biosrom(void __iomem *image)
173 EXPORT_SYMBOL(pci_unmap_biosrom);
175 size_t pci_biosrom_size(struct pci_dev *pdev)
177 struct resource *oprom = find_oprom(pdev);
179 return oprom ? resource_size(oprom) : 0;
181 EXPORT_SYMBOL(pci_biosrom_size);
183 #define ROMSIGNATURE 0xaa55
185 static int __init romsignature(const unsigned char *rom)
187 const unsigned short * const ptr = (const unsigned short *)rom;
190 return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE;
193 static int __init romchecksum(const unsigned char *rom, unsigned long length)
195 unsigned char sum, c;
197 for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--)
199 return !length && !sum;
202 void __init probe_roms(void)
204 const unsigned char *rom;
205 unsigned long start, length, upper;
210 upper = adapter_rom_resources[0].start;
211 for (start = video_rom_resource.start; start < upper; start += 2048) {
212 rom = isa_bus_to_virt(start);
213 if (!romsignature(rom))
216 video_rom_resource.start = start;
218 if (probe_kernel_address(rom + 2, c) != 0)
221 /* 0 < length <= 0x7f * 512, historically */
224 /* if checksum okay, trust length byte */
225 if (length && romchecksum(rom, length))
226 video_rom_resource.end = start + length - 1;
228 request_resource(&iomem_resource, &video_rom_resource);
232 start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
237 request_resource(&iomem_resource, &system_rom_resource);
238 upper = system_rom_resource.start;
240 /* check for extension rom (ignore length byte!) */
241 rom = isa_bus_to_virt((unsigned long)extension_rom_resource.start);
242 if (romsignature(rom)) {
243 length = resource_size(&extension_rom_resource);
244 if (romchecksum(rom, length)) {
245 request_resource(&iomem_resource, &extension_rom_resource);
246 upper = extension_rom_resource.start;
250 /* check for adapter roms on 2k boundaries */
251 for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += 2048) {
252 rom = isa_bus_to_virt(start);
253 if (!romsignature(rom))
256 if (probe_kernel_address(rom + 2, c) != 0)
259 /* 0 < length <= 0x7f * 512, historically */
262 /* but accept any length that fits if checksum okay */
263 if (!length || start + length > upper || !romchecksum(rom, length))
266 adapter_rom_resources[i].start = start;
267 adapter_rom_resources[i].end = start + length - 1;
268 request_resource(&iomem_resource, &adapter_rom_resources[i]);
270 start = adapter_rom_resources[i++].end & ~2047UL;