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Annotation of Gnu-Mach/i386/i386at/gpl/linux/pci/bios32.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * bios32.c - BIOS32, PCI BIOS functions.
        !             3:  *
        !             4:  * Sponsored by
        !             5:  *     iX Multiuser Multitasking Magazine
        !             6:  *     Hannover, Germany
        !             7:  *     [email protected]
        !             8:  *
        !             9:  * Copyright 1993, 1994 Drew Eckhardt
        !            10:  *      Visionary Computing
        !            11:  *      (Unix and Linux consulting and custom programming)
        !            12:  *      [email protected]
        !            13:  *      +1 (303) 786-7975
        !            14:  *
        !            15:  * For more information, please consult
        !            16:  *
        !            17:  * PCI BIOS Specification Revision
        !            18:  * PCI Local Bus Specification
        !            19:  * PCI System Design Guide
        !            20:  *
        !            21:  * PCI Special Interest Group
        !            22:  * M/S HF3-15A
        !            23:  * 5200 N.E. Elam Young Parkway
        !            24:  * Hillsboro, Oregon 97124-6497
        !            25:  * +1 (503) 696-2000
        !            26:  * +1 (800) 433-5177
        !            27:  *
        !            28:  * Manuals are $25 each or $50 for all three, plus $7 shipping
        !            29:  * within the United States, $35 abroad.
        !            30:  *
        !            31:  *
        !            32:  * CHANGELOG :
        !            33:  * Jun 17, 1994 : Modified to accommodate the broken pre-PCI BIOS SPECIFICATION
        !            34:  *     Revision 2.0 present on <[email protected]>'s ASUS mainboard.
        !            35:  *
        !            36:  * Jan 5,  1995 : Modified to probe PCI hardware at boot time by Frederic
        !            37:  *     Potter, [email protected]
        !            38:  *
        !            39:  * Jan 10, 1995 : Modified to store the information about configured pci
        !            40:  *      devices into a list, which can be accessed via /proc/pci by
        !            41:  *      Curtis Varner, [email protected]
        !            42:  *
        !            43:  * Jan 12, 1995 : CPU-PCI bridge optimization support by Frederic Potter.
        !            44:  *     Alpha version. Intel & UMC chipset support only.
        !            45:  *
        !            46:  * Apr 16, 1995 : Source merge with the DEC Alpha PCI support. Most of the code
        !            47:  *     moved to drivers/pci/pci.c.
        !            48:  *
        !            49:  *
        !            50:  */
        !            51: 
        !            52: #include <linux/config.h>
        !            53: #include <linux/types.h>
        !            54: #include <linux/kernel.h>
        !            55: #include <linux/bios32.h>
        !            56: #include <linux/pci.h>
        !            57: 
        !            58: #include <asm/segment.h>
        !            59: 
        !            60: #define PCIBIOS_PCI_FUNCTION_ID        0xb1XX
        !            61: #define PCIBIOS_PCI_BIOS_PRESENT       0xb101
        !            62: #define PCIBIOS_FIND_PCI_DEVICE                0xb102
        !            63: #define PCIBIOS_FIND_PCI_CLASS_CODE    0xb103
        !            64: #define PCIBIOS_GENERATE_SPECIAL_CYCLE 0xb106
        !            65: #define PCIBIOS_READ_CONFIG_BYTE       0xb108
        !            66: #define PCIBIOS_READ_CONFIG_WORD       0xb109
        !            67: #define PCIBIOS_READ_CONFIG_DWORD      0xb10a
        !            68: #define PCIBIOS_WRITE_CONFIG_BYTE      0xb10b
        !            69: #define PCIBIOS_WRITE_CONFIG_WORD      0xb10c
        !            70: #define PCIBIOS_WRITE_CONFIG_DWORD     0xb10d
        !            71: 
        !            72: 
        !            73: /* BIOS32 signature: "_32_" */
        !            74: #define BIOS32_SIGNATURE       (('_' << 0) + ('3' << 8) + ('2' << 16) + ('_' << 24))
        !            75: 
        !            76: /* PCI signature: "PCI " */
        !            77: #define PCI_SIGNATURE          (('P' << 0) + ('C' << 8) + ('I' << 16) + (' ' << 24))
        !            78: 
        !            79: /* PCI service signature: "$PCI" */
        !            80: #define PCI_SERVICE            (('$' << 0) + ('P' << 8) + ('C' << 16) + ('I' << 24))
        !            81: 
        !            82: /*
        !            83:  * This is the standard structure used to identify the entry point
        !            84:  * to the BIOS32 Service Directory, as documented in
        !            85:  *     Standard BIOS 32-bit Service Directory Proposal
        !            86:  *     Revision 0.4 May 24, 1993
        !            87:  *     Phoenix Technologies Ltd.
        !            88:  *     Norwood, MA
        !            89:  * and the PCI BIOS specification.
        !            90:  */
        !            91: 
        !            92: union bios32 {
        !            93:        struct {
        !            94:                unsigned long signature;        /* _32_ */
        !            95:                unsigned long entry;            /* 32 bit physical address */
        !            96:                unsigned char revision;         /* Revision level, 0 */
        !            97:                unsigned char length;           /* Length in paragraphs should be 01 */
        !            98:                unsigned char checksum;         /* All bytes must add up to zero */
        !            99:                unsigned char reserved[5];      /* Must be zero */
        !           100:        } fields;
        !           101:        char chars[16];
        !           102: };
        !           103: 
        !           104: /*
        !           105:  * Physical address of the service directory.  I don't know if we're
        !           106:  * allowed to have more than one of these or not, so just in case
        !           107:  * we'll make pcibios_present() take a memory start parameter and store
        !           108:  * the array there.
        !           109:  */
        !           110: 
        !           111: static unsigned long bios32_entry = 0;
        !           112: static struct {
        !           113:        unsigned long address;
        !           114:        unsigned short segment;
        !           115: } bios32_indirect = { 0, KERNEL_CS };
        !           116: 
        !           117: #ifdef CONFIG_PCI
        !           118: /*
        !           119:  * Returns the entry point for the given service, NULL on error
        !           120:  */
        !           121: 
        !           122: static unsigned long bios32_service(unsigned long service)
        !           123: {
        !           124:        unsigned char return_code;      /* %al */
        !           125:        unsigned long address;          /* %ebx */
        !           126:        unsigned long length;           /* %ecx */
        !           127:        unsigned long entry;            /* %edx */
        !           128: 
        !           129:        __asm__("lcall (%%edi)"
        !           130:                : "=a" (return_code),
        !           131:                  "=b" (address),
        !           132:                  "=c" (length),
        !           133:                  "=d" (entry)
        !           134:                : "0" (service),
        !           135:                  "1" (0),
        !           136:                  "D" (&bios32_indirect));
        !           137: 
        !           138:        switch (return_code) {
        !           139:                case 0:
        !           140:                        return address + entry;
        !           141:                case 0x80:      /* Not present */
        !           142:                        printk("bios32_service(%ld) : not present\n", service);
        !           143:                        return 0;
        !           144:                default: /* Shouldn't happen */
        !           145:                        printk("bios32_service(%ld) : returned 0x%x, mail [email protected]\n",
        !           146:                                service, return_code);
        !           147:                        return 0;
        !           148:        }
        !           149: }
        !           150: 
        !           151: static long pcibios_entry = 0;
        !           152: static struct {
        !           153:        unsigned long address;
        !           154:        unsigned short segment;
        !           155: } pci_indirect = { 0, KERNEL_CS };
        !           156: 
        !           157: 
        !           158: extern unsigned long check_pcibios(unsigned long memory_start, unsigned long memory_end)
        !           159: {
        !           160:        unsigned long signature;
        !           161:        unsigned char present_status;
        !           162:        unsigned char major_revision;
        !           163:        unsigned char minor_revision;
        !           164:        int pack;
        !           165: 
        !           166:        if ((pcibios_entry = bios32_service(PCI_SERVICE))) {
        !           167:                pci_indirect.address = pcibios_entry;
        !           168: 
        !           169:                __asm__("lcall (%%edi)\n\t"
        !           170:                        "jc 1f\n\t"
        !           171:                        "xor %%ah, %%ah\n"
        !           172:                        "1:\tshl $8, %%eax\n\t"
        !           173:                        "movw %%bx, %%ax"
        !           174:                        : "=d" (signature),
        !           175:                          "=a" (pack)
        !           176:                        : "1" (PCIBIOS_PCI_BIOS_PRESENT),
        !           177:                          "D" (&pci_indirect)
        !           178:                        : "bx", "cx");
        !           179: 
        !           180:                present_status = (pack >> 16) & 0xff;
        !           181:                major_revision = (pack >> 8) & 0xff;
        !           182:                minor_revision = pack & 0xff;
        !           183:                if (present_status || (signature != PCI_SIGNATURE)) {
        !           184:                        printk ("pcibios_init : %s : BIOS32 Service Directory says PCI BIOS is present,\n"
        !           185:                                "       but PCI_BIOS_PRESENT subfunction fails with present status of 0x%x\n"
        !           186:                                "       and signature of 0x%08lx (%c%c%c%c).  mail [email protected]\n",
        !           187:                                (signature == PCI_SIGNATURE) ?  "WARNING" : "ERROR",
        !           188:                                present_status, signature,
        !           189:                                (char) (signature >>  0), (char) (signature >>  8),
        !           190:                                (char) (signature >> 16), (char) (signature >> 24));
        !           191: 
        !           192:                        if (signature != PCI_SIGNATURE)
        !           193:                                pcibios_entry = 0;
        !           194:                }
        !           195: #if 0
        !           196:                if (pcibios_entry) {
        !           197:                        printk ("pcibios_init : PCI BIOS revision %x.%02x entry at 0x%lx\n",
        !           198:                                major_revision, minor_revision, pcibios_entry);
        !           199:                }
        !           200: #endif
        !           201:        }
        !           202:        return memory_start;
        !           203: }
        !           204: 
        !           205: int pcibios_present(void)
        !           206: {
        !           207:        return pcibios_entry ? 1 : 0;
        !           208: }
        !           209: 
        !           210: int pcibios_find_class (unsigned int class_code, unsigned short index,
        !           211:        unsigned char *bus, unsigned char *device_fn)
        !           212: {
        !           213:        unsigned long bx;
        !           214:        unsigned long ret;
        !           215: 
        !           216:        __asm__ ("lcall (%%edi)\n\t"
        !           217:                "jc 1f\n\t"
        !           218:                "xor %%ah, %%ah\n"
        !           219:                "1:"
        !           220:                : "=b" (bx),
        !           221:                  "=a" (ret)
        !           222:                : "1" (PCIBIOS_FIND_PCI_CLASS_CODE),
        !           223:                  "c" (class_code),
        !           224:                  "S" ((int) index),
        !           225:                  "D" (&pci_indirect));
        !           226:        *bus = (bx >> 8) & 0xff;
        !           227:        *device_fn = bx & 0xff;
        !           228:        return (int) (ret & 0xff00) >> 8;
        !           229: }
        !           230: 
        !           231: 
        !           232: int pcibios_find_device (unsigned short vendor, unsigned short device_id,
        !           233:        unsigned short index, unsigned char *bus, unsigned char *device_fn)
        !           234: {
        !           235:        unsigned short bx;
        !           236:        unsigned short ret;
        !           237: 
        !           238:        __asm__("lcall (%%edi)\n\t"
        !           239:                "jc 1f\n\t"
        !           240:                "xor %%ah, %%ah\n"
        !           241:                "1:"
        !           242:                : "=b" (bx),
        !           243:                  "=a" (ret)
        !           244:                : "1" (PCIBIOS_FIND_PCI_DEVICE),
        !           245:                  "c" (device_id),
        !           246:                  "d" (vendor),
        !           247:                  "S" ((int) index),
        !           248:                  "D" (&pci_indirect));
        !           249:        *bus = (bx >> 8) & 0xff;
        !           250:        *device_fn = bx & 0xff;
        !           251:        return (int) (ret & 0xff00) >> 8;
        !           252: }
        !           253: 
        !           254: int pcibios_read_config_byte(unsigned char bus,
        !           255:        unsigned char device_fn, unsigned char where, unsigned char *value)
        !           256: {
        !           257:        unsigned long ret;
        !           258:        unsigned long bx = (bus << 8) | device_fn;
        !           259: 
        !           260:        __asm__("lcall (%%esi)\n\t"
        !           261:                "jc 1f\n\t"
        !           262:                "xor %%ah, %%ah\n"
        !           263:                "1:"
        !           264:                : "=c" (*value),
        !           265:                  "=a" (ret)
        !           266:                : "1" (PCIBIOS_READ_CONFIG_BYTE),
        !           267:                  "b" (bx),
        !           268:                  "D" ((long) where),
        !           269:                  "S" (&pci_indirect));
        !           270:        return (int) (ret & 0xff00) >> 8;
        !           271: }
        !           272: 
        !           273: int pcibios_read_config_word (unsigned char bus,
        !           274:        unsigned char device_fn, unsigned char where, unsigned short *value)
        !           275: {
        !           276:        unsigned long ret;
        !           277:        unsigned long bx = (bus << 8) | device_fn;
        !           278: 
        !           279:        __asm__("lcall (%%esi)\n\t"
        !           280:                "jc 1f\n\t"
        !           281:                "xor %%ah, %%ah\n"
        !           282:                "1:"
        !           283:                : "=c" (*value),
        !           284:                  "=a" (ret)
        !           285:                : "1" (PCIBIOS_READ_CONFIG_WORD),
        !           286:                  "b" (bx),
        !           287:                  "D" ((long) where),
        !           288:                  "S" (&pci_indirect));
        !           289:        return (int) (ret & 0xff00) >> 8;
        !           290: }
        !           291: 
        !           292: int pcibios_read_config_dword (unsigned char bus,
        !           293:        unsigned char device_fn, unsigned char where, unsigned int *value)
        !           294: {
        !           295:        unsigned long ret;
        !           296:        unsigned long bx = (bus << 8) | device_fn;
        !           297: 
        !           298:        __asm__("lcall (%%esi)\n\t"
        !           299:                "jc 1f\n\t"
        !           300:                "xor %%ah, %%ah\n"
        !           301:                "1:"
        !           302:                : "=c" (*value),
        !           303:                  "=a" (ret)
        !           304:                : "1" (PCIBIOS_READ_CONFIG_DWORD),
        !           305:                  "b" (bx),
        !           306:                  "D" ((long) where),
        !           307:                  "S" (&pci_indirect));
        !           308:        return (int) (ret & 0xff00) >> 8;
        !           309: }
        !           310: 
        !           311: int pcibios_write_config_byte (unsigned char bus,
        !           312:        unsigned char device_fn, unsigned char where, unsigned char value)
        !           313: {
        !           314:        unsigned long ret;
        !           315:        unsigned long bx = (bus << 8) | device_fn;
        !           316: 
        !           317:        __asm__("lcall (%%esi)\n\t"
        !           318:                "jc 1f\n\t"
        !           319:                "xor %%ah, %%ah\n"
        !           320:                "1:"
        !           321:                : "=a" (ret)
        !           322:                : "0" (PCIBIOS_WRITE_CONFIG_BYTE),
        !           323:                  "c" (value),
        !           324:                  "b" (bx),
        !           325:                  "D" ((long) where),
        !           326:                  "S" (&pci_indirect));
        !           327:        return (int) (ret & 0xff00) >> 8;
        !           328: }
        !           329: 
        !           330: int pcibios_write_config_word (unsigned char bus,
        !           331:        unsigned char device_fn, unsigned char where, unsigned short value)
        !           332: {
        !           333:        unsigned long ret;
        !           334:        unsigned long bx = (bus << 8) | device_fn;
        !           335: 
        !           336:        __asm__("lcall (%%esi)\n\t"
        !           337:                "jc 1f\n\t"
        !           338:                "xor %%ah, %%ah\n"
        !           339:                "1:"
        !           340:                : "=a" (ret)
        !           341:                : "0" (PCIBIOS_WRITE_CONFIG_WORD),
        !           342:                  "c" (value),
        !           343:                  "b" (bx),
        !           344:                  "D" ((long) where),
        !           345:                  "S" (&pci_indirect));
        !           346:        return (int) (ret & 0xff00) >> 8;
        !           347: }
        !           348: 
        !           349: int pcibios_write_config_dword (unsigned char bus,
        !           350:        unsigned char device_fn, unsigned char where, unsigned int value)
        !           351: {
        !           352:        unsigned long ret;
        !           353:        unsigned long bx = (bus << 8) | device_fn;
        !           354: 
        !           355:        __asm__("lcall (%%esi)\n\t"
        !           356:                "jc 1f\n\t"
        !           357:                "xor %%ah, %%ah\n"
        !           358:                "1:"
        !           359:                : "=a" (ret)
        !           360:                : "0" (PCIBIOS_WRITE_CONFIG_DWORD),
        !           361:                  "c" (value),
        !           362:                  "b" (bx),
        !           363:                  "D" ((long) where),
        !           364:                  "S" (&pci_indirect));
        !           365:        return (int) (ret & 0xff00) >> 8;
        !           366: }
        !           367: 
        !           368: const char *pcibios_strerror (int error)
        !           369: {
        !           370:        static char buf[80];
        !           371: 
        !           372:        switch (error) {
        !           373:                case PCIBIOS_SUCCESSFUL:
        !           374:                        return "SUCCESSFUL";
        !           375: 
        !           376:                case PCIBIOS_FUNC_NOT_SUPPORTED:
        !           377:                        return "FUNC_NOT_SUPPORTED";
        !           378: 
        !           379:                case PCIBIOS_BAD_VENDOR_ID:
        !           380:                        return "SUCCESSFUL";
        !           381: 
        !           382:                case PCIBIOS_DEVICE_NOT_FOUND:
        !           383:                        return "DEVICE_NOT_FOUND";
        !           384: 
        !           385:                case PCIBIOS_BAD_REGISTER_NUMBER:
        !           386:                        return "BAD_REGISTER_NUMBER";
        !           387: 
        !           388:                 case PCIBIOS_SET_FAILED:          
        !           389:                        return "SET_FAILED";
        !           390: 
        !           391:                 case PCIBIOS_BUFFER_TOO_SMALL:    
        !           392:                        return "BUFFER_TOO_SMALL";
        !           393: 
        !           394:                default:
        !           395:                        sprintf (buf, "UNKNOWN RETURN 0x%x", error);
        !           396:                        return buf;
        !           397:        }
        !           398: }
        !           399: 
        !           400: 
        !           401: unsigned long pcibios_fixup(unsigned long mem_start, unsigned long mem_end)
        !           402: {
        !           403: return mem_start;
        !           404: }
        !           405: 
        !           406: 
        !           407: #endif
        !           408: 
        !           409: unsigned long pcibios_init(unsigned long memory_start, unsigned long memory_end)
        !           410: {
        !           411:        union bios32 *check;
        !           412:        unsigned char sum;
        !           413:        int i, length;
        !           414: 
        !           415:        /*
        !           416:         * Follow the standard procedure for locating the BIOS32 Service
        !           417:         * directory by scanning the permissible address range from
        !           418:         * 0xe0000 through 0xfffff for a valid BIOS32 structure.
        !           419:         *
        !           420:         */
        !           421: 
        !           422:        for (check = (union bios32 *) 0xe0000; check <= (union bios32 *) 0xffff0; ++check) {
        !           423:                if (check->fields.signature != BIOS32_SIGNATURE)
        !           424:                        continue;
        !           425:                length = check->fields.length * 16;
        !           426:                if (!length)
        !           427:                        continue;
        !           428:                sum = 0;
        !           429:                for (i = 0; i < length ; ++i)
        !           430:                        sum += check->chars[i];
        !           431:                if (sum != 0)
        !           432:                        continue;
        !           433:                if (check->fields.revision != 0) {
        !           434:                        printk("pcibios_init : unsupported revision %d at 0x%p, mail [email protected]\n",
        !           435:                                check->fields.revision, check);
        !           436:                        continue;
        !           437:                }
        !           438: #if 0
        !           439:                printk ("pcibios_init : BIOS32 Service Directory structure at 0x%p\n", check);
        !           440: #endif
        !           441:                if (!bios32_entry) {
        !           442:                        if (check->fields.entry >= 0x100000) {
        !           443:                                printk("pcibios_init: entry in high memory, unable to access\n");
        !           444:                        } else {
        !           445:                                bios32_indirect.address = bios32_entry = check->fields.entry;
        !           446: #if 0
        !           447:                                printk ("pcibios_init : BIOS32 Service Directory entry at 0x%lx\n", bios32_entry);
        !           448: #endif
        !           449:                        }
        !           450:                } else {
        !           451:                        printk ("pcibios_init : multiple entries, mail [email protected]\n");
        !           452:                        /*
        !           453:                         * Jeremy Fitzhardinge reports at least one PCI BIOS
        !           454:                         * with two different service directories, and as both
        !           455:                         * worked for him, we'll just mention the fact, and
        !           456:                         * not actually disallow it..
        !           457:                         */
        !           458:                }
        !           459:        }
        !           460: #ifdef CONFIG_PCI
        !           461:        if (bios32_entry) {
        !           462:                memory_start = check_pcibios (memory_start, memory_end);
        !           463:        }
        !           464: #endif
        !           465:        return memory_start;
        !           466: }

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