1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/sched.h>
4 #include <linux/uaccess.h>
5 #include <linux/mmzone.h>
6 #include <linux/ioport.h>
7 #include <linux/seq_file.h>
8 #include <linux/console.h>
9 #include <linux/init.h>
10 #include <linux/edd.h>
11 #include <linux/dmi.h>
12 #include <linux/pfn.h>
13 #include <linux/pci.h>
14 #include <linux/export.h>
16 #include <asm/probe_roms.h>
17 #include <asm/pci-direct.h>
18 #include <asm/e820/api.h>
19 #include <asm/mmzone.h>
20 #include <asm/setup.h>
21 #include <asm/sections.h>
23 #include <asm/setup_arch.h>
25 static struct resource system_rom_resource = {
29 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
32 static struct resource extension_rom_resource = {
33 .name = "Extension ROM",
36 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
39 static struct resource adapter_rom_resources[] = { {
40 .name = "Adapter ROM",
43 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
45 .name = "Adapter ROM",
48 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
50 .name = "Adapter ROM",
53 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
55 .name = "Adapter ROM",
58 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
60 .name = "Adapter ROM",
63 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
65 .name = "Adapter ROM",
68 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
71 static struct resource video_rom_resource = {
75 .flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
78 /* does this oprom support the given pci device, or any of the devices
79 * that the driver supports?
81 static bool match_id(struct pci_dev *pdev, unsigned short vendor, unsigned short device)
83 struct pci_driver *drv = to_pci_driver(pdev->dev.driver);
84 const struct pci_device_id *id;
86 if (pdev->vendor == vendor && pdev->device == device)
89 for (id = drv ? drv->id_table : NULL; id && id->vendor; id++)
90 if (id->vendor == vendor && id->device == device)
93 return id && id->vendor;
96 static bool probe_list(struct pci_dev *pdev, unsigned short vendor,
99 unsigned short device;
102 if (get_kernel_nofault(device, rom_list) != 0)
105 if (device && match_id(pdev, vendor, device))
114 static struct resource *find_oprom(struct pci_dev *pdev)
116 struct resource *oprom = NULL;
119 for (i = 0; i < ARRAY_SIZE(adapter_rom_resources); i++) {
120 struct resource *res = &adapter_rom_resources[i];
121 unsigned short offset, vendor, device, list, rev;
127 rom = isa_bus_to_virt(res->start);
128 if (get_kernel_nofault(offset, rom + 0x18) != 0)
131 if (get_kernel_nofault(vendor, rom + offset + 0x4) != 0)
134 if (get_kernel_nofault(device, rom + offset + 0x6) != 0)
137 if (match_id(pdev, vendor, device)) {
142 if (get_kernel_nofault(list, rom + offset + 0x8) == 0 &&
143 get_kernel_nofault(rev, rom + offset + 0xc) == 0 &&
145 probe_list(pdev, vendor, rom + offset + list)) {
154 void __iomem *pci_map_biosrom(struct pci_dev *pdev)
156 struct resource *oprom = find_oprom(pdev);
161 return ioremap(oprom->start, resource_size(oprom));
163 EXPORT_SYMBOL(pci_map_biosrom);
165 void pci_unmap_biosrom(void __iomem *image)
169 EXPORT_SYMBOL(pci_unmap_biosrom);
171 size_t pci_biosrom_size(struct pci_dev *pdev)
173 struct resource *oprom = find_oprom(pdev);
175 return oprom ? resource_size(oprom) : 0;
177 EXPORT_SYMBOL(pci_biosrom_size);
179 #define ROMSIGNATURE 0xaa55
181 static int __init romsignature(const unsigned char *rom)
183 const unsigned short * const ptr = (const unsigned short *)rom;
186 return get_kernel_nofault(sig, ptr) == 0 && sig == ROMSIGNATURE;
189 static int __init romchecksum(const unsigned char *rom, unsigned long length)
191 unsigned char sum, c;
193 for (sum = 0; length && get_kernel_nofault(c, rom++) == 0; length--)
195 return !length && !sum;
198 void __init probe_roms(void)
200 const unsigned char *rom;
201 unsigned long start, length, upper;
206 upper = adapter_rom_resources[0].start;
207 for (start = video_rom_resource.start; start < upper; start += 2048) {
208 rom = isa_bus_to_virt(start);
209 if (!romsignature(rom))
212 video_rom_resource.start = start;
214 if (get_kernel_nofault(c, rom + 2) != 0)
217 /* 0 < length <= 0x7f * 512, historically */
220 /* if checksum okay, trust length byte */
221 if (length && romchecksum(rom, length))
222 video_rom_resource.end = start + length - 1;
224 request_resource(&iomem_resource, &video_rom_resource);
228 start = (video_rom_resource.end + 1 + 2047) & ~2047UL;
233 request_resource(&iomem_resource, &system_rom_resource);
234 upper = system_rom_resource.start;
236 /* check for extension rom (ignore length byte!) */
237 rom = isa_bus_to_virt(extension_rom_resource.start);
238 if (romsignature(rom)) {
239 length = resource_size(&extension_rom_resource);
240 if (romchecksum(rom, length)) {
241 request_resource(&iomem_resource, &extension_rom_resource);
242 upper = extension_rom_resource.start;
246 /* check for adapter roms on 2k boundaries */
247 for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += 2048) {
248 rom = isa_bus_to_virt(start);
249 if (!romsignature(rom))
252 if (get_kernel_nofault(c, rom + 2) != 0)
255 /* 0 < length <= 0x7f * 512, historically */
258 /* but accept any length that fits if checksum okay */
259 if (!length || start + length > upper || !romchecksum(rom, length))
262 adapter_rom_resources[i].start = start;
263 adapter_rom_resources[i].end = start + length - 1;
264 request_resource(&iomem_resource, &adapter_rom_resources[i]);
266 start = adapter_rom_resources[i++].end & ~2047UL;