1 // Option rom scanning code.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2002 MandrakeSoft S.A.
6 // This file may be distributed under the terms of the GNU LGPLv3 license.
8 #include "bregs.h" // struct bregs
9 #include "farptr.h" // FLATPTR_TO_SEG
10 #include "config.h" // CONFIG_*
11 #include "util.h" // dprintf
12 #include "pci.h" // foreachpci
13 #include "pci_regs.h" // PCI_ROM_ADDRESS
14 #include "pci_ids.h" // PCI_CLASS_DISPLAY_VGA
15 #include "boot.h" // IPL
16 #include "paravirt.h" // qemu_cfg_*
19 /****************************************************************
21 ****************************************************************/
68 #define OPTION_ROM_SIGNATURE 0xaa55
69 #define OPTION_ROM_ALIGN 2048
70 #define OPTION_ROM_INITVECTOR offsetof(struct rom_header, initVector[0])
71 #define PCI_ROM_SIGNATURE 0x52494350 // PCIR
72 #define PCIROM_CODETYPE_X86 0
74 // The end of the last deployed rom.
75 u32 RomEnd = BUILD_ROM_START;
78 /****************************************************************
80 ****************************************************************/
82 // Execute a given option rom.
84 __callrom(struct rom_header *rom, u16 offset, u16 bdf)
86 u16 seg = FLATPTR_TO_SEG(rom);
87 dprintf(1, "Running option rom at %04x:%04x\n", seg, offset);
90 memset(&br, 0, sizeof(br));
96 br.di = get_pnp_offset();
97 br.code = SEGOFF(seg, offset);
102 debug_serial_setup();
105 // Execute a given option rom at the standard entry vector.
107 callrom(struct rom_header *rom, u16 bdf)
109 __callrom(rom, OPTION_ROM_INITVECTOR, bdf);
112 // Execute a BCV option rom registered via add_bcv().
114 call_bcv(u16 seg, u16 ip)
116 __callrom(MAKE_FLATPTR(seg, 0), ip, 0);
119 static int EnforceChecksum;
121 // Verify that an option rom looks valid
123 is_valid_rom(struct rom_header *rom)
125 dprintf(6, "Checking rom %p (sig %x size %d)\n"
126 , rom, rom->signature, rom->size);
127 if (rom->signature != OPTION_ROM_SIGNATURE)
131 u32 len = rom->size * 512;
132 u8 sum = checksum(rom, len);
134 dprintf(1, "Found option rom with bad checksum: loc=%p len=%d sum=%x\n"
142 // Check if a valid option rom has a pnp struct; return it if so.
143 static struct pnp_data *
144 get_pnp_rom(struct rom_header *rom)
146 struct pnp_data *pnp = (void*)((u8*)rom + rom->pnpoffset);
147 if (pnp->signature != PNP_SIGNATURE)
152 // Check for multiple pnp option rom headers.
153 static struct pnp_data *
154 get_pnp_next(struct rom_header *rom, struct pnp_data *pnp)
156 if (! pnp->nextoffset)
158 pnp = (void*)((u8*)rom + pnp->nextoffset);
159 if (pnp->signature != PNP_SIGNATURE)
164 // Check if a valid option rom has a pci struct; return it if so.
165 static struct pci_data *
166 get_pci_rom(struct rom_header *rom)
168 struct pci_data *pd = (void*)((u32)rom + rom->pcioffset);
169 if (pd->signature != PCI_ROM_SIGNATURE)
174 // Return start of code in 0xc0000-0xf0000 space.
175 static inline u32 _max_rom(void) {
176 extern u8 code32flat_start[], code32init_end[];
177 return CONFIG_RELOCATE_INIT ? (u32)code32init_end : (u32)code32flat_start;
179 // Return the memory position up to which roms may be located.
180 static inline u32 max_rom(void) {
181 u32 end = _max_rom();
182 return end > BUILD_BIOS_ADDR ? BUILD_BIOS_ADDR : end;
185 // Copy a rom to its permanent location below 1MiB
186 static struct rom_header *
187 copy_rom(struct rom_header *rom)
189 u32 romsize = rom->size * 512;
190 if (RomEnd + romsize > max_rom()) {
191 // Option rom doesn't fit.
195 dprintf(4, "Copying option rom (size %d) from %p to %x\n"
196 , romsize, rom, RomEnd);
197 iomemcpy((void*)RomEnd, rom, romsize);
198 return (void*)RomEnd;
201 // Run rom init code and note rom size.
203 init_optionrom(struct rom_header *rom, u16 bdf, int isvga)
205 if (! is_valid_rom(rom))
208 if (isvga || get_pnp_rom(rom))
209 // Only init vga and PnP roms here.
212 RomEnd = (u32)rom + ALIGN(rom->size * 512, OPTION_ROM_ALIGN);
217 #define RS_PCIROM (1LL<<33)
220 setRomSource(u64 *sources, struct rom_header *rom, u64 source)
223 sources[((u32)rom - BUILD_ROM_START) / OPTION_ROM_ALIGN] = source;
227 getRomPriority(u64 *sources, struct rom_header *rom, int instance)
229 u64 source = sources[((u32)rom - BUILD_ROM_START) / OPTION_ROM_ALIGN];
232 if (source & RS_PCIROM)
233 return bootprio_find_pci_rom((void*)(u32)source, instance);
234 return bootprio_find_named_rom(romfile_name(source), instance);
238 /****************************************************************
240 ****************************************************************/
242 // Check if an option rom is at a hardcoded location or in CBFS.
243 static struct rom_header *
244 lookup_hardcode(struct pci_device *pci)
247 snprintf(fname, sizeof(fname), "pci%04x,%04x.rom"
248 , pci->vendor, pci->device);
249 int ret = romfile_copy(romfile_find(fname), (void*)RomEnd
250 , max_rom() - RomEnd);
253 return (void*)RomEnd;
256 // Run all roms in a given CBFS directory.
258 run_file_roms(const char *prefix, int isvga, u64 *sources)
262 file = romfile_findprefix(prefix, file);
265 struct rom_header *rom = (void*)RomEnd;
266 int ret = romfile_copy(file, rom, max_rom() - RomEnd);
268 setRomSource(sources, rom, file);
269 init_optionrom(rom, 0, isvga);
275 /****************************************************************
277 ****************************************************************/
279 // Verify device is a vga device with legacy address decoding enabled.
281 is_pci_vga(struct pci_device *pci)
283 if (pci->class != PCI_CLASS_DISPLAY_VGA)
285 u16 cmd = pci_config_readw(pci->bdf, PCI_COMMAND);
286 if (!(cmd & PCI_COMMAND_IO && cmd & PCI_COMMAND_MEMORY))
288 while (pci->parent) {
290 u32 ctrl = pci_config_readb(pci->bdf, PCI_BRIDGE_CONTROL);
291 if (!(ctrl & PCI_BRIDGE_CTL_VGA))
297 // Map the option rom of a given PCI device.
298 static struct rom_header *
299 map_pcirom(struct pci_device *pci)
302 dprintf(6, "Attempting to map option rom on dev %02x:%02x.%x\n"
303 , pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf));
305 if ((pci->header_type & 0x7f) != PCI_HEADER_TYPE_NORMAL) {
306 dprintf(6, "Skipping non-normal pci device (type=%x)\n"
311 u32 orig = pci_config_readl(bdf, PCI_ROM_ADDRESS);
312 pci_config_writel(bdf, PCI_ROM_ADDRESS, ~PCI_ROM_ADDRESS_ENABLE);
313 u32 sz = pci_config_readl(bdf, PCI_ROM_ADDRESS);
315 dprintf(6, "Option rom sizing returned %x %x\n", orig, sz);
316 orig &= ~PCI_ROM_ADDRESS_ENABLE;
317 if (!sz || sz == 0xffffffff)
320 if (orig == sz || (u32)(orig + 4*1024*1024) < 20*1024*1024) {
321 // Don't try to map to a pci addresses at its max, in the last
322 // 4MiB of ram, or the first 16MiB of ram.
323 dprintf(6, "Preset rom address doesn't look valid\n");
327 // Looks like a rom - enable it.
328 pci_config_writel(bdf, PCI_ROM_ADDRESS, orig | PCI_ROM_ADDRESS_ENABLE);
330 struct rom_header *rom = (void*)orig;
332 dprintf(5, "Inspecting possible rom at %p (vd=%04x:%04x"
333 " bdf=%02x:%02x.%x)\n"
334 , rom, pci->vendor, pci->device
335 , pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf));
336 if (rom->signature != OPTION_ROM_SIGNATURE) {
337 dprintf(6, "No option rom signature (got %x)\n", rom->signature);
340 struct pci_data *pd = get_pci_rom(rom);
342 dprintf(6, "No valid pci signature found\n");
346 if (pd->vendor == pci->vendor && pd->device == pci->device
347 && pd->type == PCIROM_CODETYPE_X86)
350 dprintf(6, "Didn't match dev/ven (got %04x:%04x) or type (got %d)\n"
351 , pd->vendor, pd->device, pd->type);
352 if (pd->indicator & 0x80) {
353 dprintf(6, "No more images left\n");
356 rom = (void*)((u32)rom + pd->ilen * 512);
360 pci_config_writel(bdf, PCI_ROM_ADDRESS, orig);
363 // Not valid - restore original and exit.
364 pci_config_writel(bdf, PCI_ROM_ADDRESS, orig);
368 // Attempt to map and initialize the option rom on a given PCI device.
370 init_pcirom(struct pci_device *pci, int isvga, u64 *sources)
373 dprintf(4, "Attempting to init PCI bdf %02x:%02x.%x (vd %04x:%04x)\n"
374 , pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf)
375 , pci->vendor, pci->device);
376 struct rom_header *rom = lookup_hardcode(pci);
378 rom = map_pcirom(pci);
382 setRomSource(sources, rom, RS_PCIROM | (u32)pci);
383 return init_optionrom(rom, bdf, isvga);
387 /****************************************************************
388 * Non-VGA option rom init
389 ****************************************************************/
392 optionrom_setup(void)
394 if (! CONFIG_OPTIONROMS)
397 dprintf(1, "Scan for option roms\n");
398 u64 sources[(BUILD_BIOS_ADDR - BUILD_ROM_START) / OPTION_ROM_ALIGN];
399 memset(sources, 0, sizeof(sources));
400 u32 post_vga = RomEnd;
402 if (CONFIG_OPTIONROMS_DEPLOYED) {
403 // Option roms are already deployed on the system.
405 while (pos < max_rom()) {
406 int ret = init_optionrom((void*)pos, 0, 0);
408 pos += OPTION_ROM_ALIGN;
413 // Find and deploy PCI roms.
414 struct pci_device *pci;
416 if (pci->class == PCI_CLASS_DISPLAY_VGA || pci->have_driver)
418 init_pcirom(pci, 0, sources);
421 // Find and deploy CBFS roms not associated with a device.
422 run_file_roms("genroms/", 0, sources);
425 // All option roms found and deployed - now build BEV/BCV vectors.
428 while (pos < RomEnd) {
429 struct rom_header *rom = (void*)pos;
430 if (! is_valid_rom(rom)) {
431 pos += OPTION_ROM_ALIGN;
434 pos += ALIGN(rom->size * 512, OPTION_ROM_ALIGN);
435 struct pnp_data *pnp = get_pnp_rom(rom);
438 boot_add_bcv(FLATPTR_TO_SEG(rom), OPTION_ROM_INITVECTOR, 0
439 , getRomPriority(sources, rom, 0));
444 // Can boot system - add to IPL list.
445 boot_add_bev(FLATPTR_TO_SEG(rom), pnp->bev, pnp->productname
446 , getRomPriority(sources, rom, 0));
448 // Check for BCV (there may be multiple).
450 while (pnp && pnp->bcv) {
451 boot_add_bcv(FLATPTR_TO_SEG(rom), pnp->bcv, pnp->productname
452 , getRomPriority(sources, rom, instance++));
453 pnp = get_pnp_next(rom, pnp);
460 /****************************************************************
462 ****************************************************************/
464 static int S3ResumeVgaInit;
467 // Call into vga code to turn on console.
471 if (! CONFIG_OPTIONROMS)
474 dprintf(1, "Scan for VGA option rom\n");
476 // Load some config settings that impact VGA.
477 EnforceChecksum = romfile_loadint("etc/optionroms-checksum", 1);
478 S3ResumeVgaInit = romfile_loadint("etc/s3-resume-vga-init", 0);
479 ScreenAndDebug = romfile_loadint("etc/screen-and-debug", 1);
481 if (CONFIG_OPTIONROMS_DEPLOYED) {
482 // Option roms are already deployed on the system.
483 init_optionrom((void*)BUILD_ROM_START, 0, 1);
485 // Clear option rom memory
486 memset((void*)RomEnd, 0, max_rom() - RomEnd);
488 // Find and deploy PCI VGA rom.
489 struct pci_device *pci;
491 if (!is_pci_vga(pci))
494 init_pcirom(pci, 1, NULL);
498 // Find and deploy CBFS vga-style roms not associated with a device.
499 run_file_roms("vgaroms/", 1, NULL);
502 if (RomEnd == BUILD_ROM_START) {
504 RomEnd += OPTION_ROM_ALIGN;
508 enable_vga_console();
512 s3_resume_vga_init(void)
514 if (!S3ResumeVgaInit)
516 struct rom_header *rom = (void*)BUILD_ROM_START;
517 if (! is_valid_rom(rom))