| 1 | /* |
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| 2 | Taken from arch/i386/kernel/dmi_scan.c. |
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| 3 | Changes dmi_ident to be non-static so we can access. |
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| 4 | */ |
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| 5 | |
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| 6 | #include <linux/module.h> |
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| 7 | #include <linux/config.h> |
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| 8 | #include <linux/types.h> |
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| 9 | #include <linux/kernel.h> |
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| 10 | #include <linux/string.h> |
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| 11 | #include <linux/init.h> |
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| 12 | #include <linux/apm_bios.h> |
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| 13 | #include <linux/slab.h> |
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| 14 | #include <asm/io.h> |
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| 15 | #include <linux/pm.h> |
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| 16 | #include <asm/keyboard.h> |
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| 17 | #include <asm/system.h> |
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| 18 | #include <linux/bootmem.h> |
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| 19 | #include "version.h" |
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| 20 | #include "dmi_scan.h" |
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| 21 | |
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| 22 | struct dmi_header |
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| 23 | { |
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| 24 | u8 type; |
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| 25 | u8 length; |
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| 26 | u16 handle; |
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| 27 | }; |
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| 28 | |
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| 29 | #define dmi_printk(x) |
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| 30 | //#define dmi_printk(x) printk x |
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| 31 | |
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| 32 | static char * __init dmi_string(struct dmi_header *dm, u8 s) |
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| 33 | { |
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| 34 | u8 *bp=(u8 *)dm; |
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| 35 | bp+=dm->length; |
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| 36 | if(!s) |
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| 37 | return ""; |
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| 38 | s--; |
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| 39 | while(s>0 && *bp) |
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| 40 | { |
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| 41 | bp+=strlen(bp); |
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| 42 | bp++; |
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| 43 | s--; |
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| 44 | } |
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| 45 | return bp; |
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| 46 | } |
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| 47 | |
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| 48 | /* |
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| 49 | * We have to be cautious here. We have seen BIOSes with DMI pointers |
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| 50 | * pointing to completely the wrong place for example |
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| 51 | */ |
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| 52 | |
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| 53 | static int __init dmi_table(u32 base, int len, int num, void (*decode)(struct dmi_header *)) |
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| 54 | { |
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| 55 | u8 *buf; |
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| 56 | struct dmi_header *dm; |
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| 57 | u8 *data; |
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| 58 | int i=0; |
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| 59 | |
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| 60 | buf = ioremap(base, len); |
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| 61 | if(buf==NULL) |
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| 62 | return -1; |
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| 63 | |
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| 64 | data = buf; |
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| 65 | |
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| 66 | /* |
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| 67 | * Stop when we see all the items the table claimed to have |
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| 68 | * OR we run off the end of the table (also happens) |
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| 69 | */ |
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| 70 | |
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| 71 | while(i<num && data-buf+sizeof(struct dmi_header)<=len) |
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| 72 | { |
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| 73 | dm=(struct dmi_header *)data; |
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| 74 | /* |
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| 75 | * We want to know the total length (formated area and strings) |
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| 76 | * before decoding to make sure we won't run off the table in |
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| 77 | * dmi_decode or dmi_string |
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| 78 | */ |
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| 79 | data+=dm->length; |
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| 80 | while(data-buf<len-1 && (data[0] || data[1])) |
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| 81 | data++; |
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| 82 | if(data-buf<len-1) |
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| 83 | decode(dm); |
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| 84 | data+=2; |
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| 85 | i++; |
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| 86 | } |
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| 87 | iounmap(buf); |
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| 88 | return 0; |
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| 89 | } |
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| 90 | |
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| 91 | |
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| 92 | inline static int __init dmi_checksum(u8 *buf) |
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| 93 | { |
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| 94 | u8 sum=0; |
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| 95 | int a; |
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| 96 | |
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| 97 | for(a=0; a<15; a++) |
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| 98 | sum+=buf[a]; |
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| 99 | return (sum==0); |
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| 100 | } |
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| 101 | |
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| 102 | static int __init dmi_iterate(void (*decode)(struct dmi_header *)) |
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| 103 | { |
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| 104 | u8 buf[15]; |
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| 105 | u32 fp=0xF0000; |
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| 106 | |
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| 107 | #ifdef CONFIG_SIMNOW |
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| 108 | /* |
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| 109 | * Skip on x86/64 with simnow. Will eventually go away |
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| 110 | * If you see this ifdef in 2.6pre mail me ! |
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| 111 | */ |
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| 112 | return -1; |
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| 113 | #endif |
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| 114 | |
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| 115 | while( fp < 0xFFFFF) |
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| 116 | { |
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| 117 | isa_memcpy_fromio(buf, fp, 15); |
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| 118 | if(memcmp(buf, "_DMI_", 5)==0 && dmi_checksum(buf)) |
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| 119 | { |
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| 120 | u16 num=buf[13]<<8|buf[12]; |
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| 121 | u16 len=buf[7]<<8|buf[6]; |
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| 122 | u32 base=buf[11]<<24|buf[10]<<16|buf[9]<<8|buf[8]; |
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| 123 | |
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| 124 | /* |
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| 125 | * DMI version 0.0 means that the real version is taken from |
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| 126 | * the SMBIOS version, which we don't know at this point. |
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| 127 | */ |
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| 128 | if(buf[14]!=0) |
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| 129 | dmi_printk((KERN_INFO "DMI %d.%d present.\n", |
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| 130 | buf[14]>>4, buf[14]&0x0F)); |
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| 131 | else |
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| 132 | dmi_printk((KERN_INFO "DMI present.\n")); |
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| 133 | dmi_printk((KERN_INFO "%d structures occupying %d bytes.\n", |
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| 134 | num, len)); |
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| 135 | dmi_printk((KERN_INFO "DMI table at 0x%08X.\n", |
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| 136 | base)); |
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| 137 | if(dmi_table(base,len, num, decode)==0) |
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| 138 | return 0; |
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| 139 | } |
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| 140 | fp+=16; |
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| 141 | } |
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| 142 | return -1; |
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| 143 | } |
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| 144 | |
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| 145 | |
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| 146 | char *dmi_ident[DMI_STRING_MAX]; |
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| 147 | |
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| 148 | /* |
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| 149 | * Save a DMI string |
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| 150 | */ |
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| 151 | |
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| 152 | static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string) |
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| 153 | { |
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| 154 | char *d = (char*)dm; |
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| 155 | char *p = dmi_string(dm, d[string]); |
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| 156 | if(p==NULL || *p == 0) |
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| 157 | return; |
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| 158 | if (dmi_ident[slot]) |
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| 159 | return; |
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| 160 | dmi_ident[slot] = kmalloc(strlen(p)+1, GFP_KERNEL); |
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| 161 | if(dmi_ident[slot]) |
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| 162 | strcpy(dmi_ident[slot], p); |
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| 163 | else |
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| 164 | printk(KERN_ERR "dmi_save_ident: out of memory.\n"); |
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| 165 | } |
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| 166 | |
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| 167 | /* |
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| 168 | * Process a DMI table entry. Right now all we care about are the BIOS |
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| 169 | * and machine entries. For 2.5 we should pull the smbus controller info |
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| 170 | * out of here. |
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| 171 | */ |
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| 172 | |
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| 173 | static void __init dmi_decode(struct dmi_header *dm) |
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| 174 | { |
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| 175 | u8 *data = (u8 *)dm; |
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| 176 | |
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| 177 | switch(dm->type) |
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| 178 | { |
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| 179 | case 0: |
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| 180 | dmi_printk(("BIOS Vendor: %s\n", |
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| 181 | dmi_string(dm, data[4]))); |
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| 182 | dmi_save_ident(dm, DMI_BIOS_VENDOR, 4); |
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| 183 | dmi_printk(("BIOS Version: %s\n", |
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| 184 | dmi_string(dm, data[5]))); |
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| 185 | dmi_save_ident(dm, DMI_BIOS_VERSION, 5); |
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| 186 | dmi_printk(("BIOS Release: %s\n", |
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| 187 | dmi_string(dm, data[8]))); |
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| 188 | dmi_save_ident(dm, DMI_BIOS_DATE, 8); |
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| 189 | break; |
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| 190 | case 1: |
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| 191 | dmi_printk(("System Vendor: %s\n", |
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| 192 | dmi_string(dm, data[4]))); |
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| 193 | dmi_save_ident(dm, DMI_SYS_VENDOR, 4); |
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| 194 | dmi_printk(("Product Name: %s\n", |
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| 195 | dmi_string(dm, data[5]))); |
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| 196 | dmi_save_ident(dm, DMI_PRODUCT_NAME, 5); |
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| 197 | dmi_printk(("Version: %s\n", |
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| 198 | dmi_string(dm, data[6]))); |
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| 199 | dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6); |
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| 200 | dmi_printk(("Serial Number: %s\n", |
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| 201 | dmi_string(dm, data[7]))); |
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| 202 | break; |
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| 203 | case 2: |
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| 204 | dmi_printk(("Board Vendor: %s\n", |
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| 205 | dmi_string(dm, data[4]))); |
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| 206 | dmi_save_ident(dm, DMI_BOARD_VENDOR, 4); |
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| 207 | dmi_printk(("Board Name: %s\n", |
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| 208 | dmi_string(dm, data[5]))); |
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| 209 | dmi_save_ident(dm, DMI_BOARD_NAME, 5); |
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| 210 | dmi_printk(("Board Version: %s\n", |
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| 211 | dmi_string(dm, data[6]))); |
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| 212 | dmi_save_ident(dm, DMI_BOARD_VERSION, 6); |
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| 213 | break; |
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| 214 | } |
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| 215 | } |
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| 216 | |
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| 217 | void __init dmi_scan_mach(void) |
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| 218 | { |
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| 219 | int err; |
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| 220 | printk("dmi_scan.o version %s (%s)\n", LM_VERSION, LM_DATE); |
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| 221 | err = dmi_iterate(dmi_decode); |
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| 222 | if(err) |
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| 223 | printk("dmi_scan.o: SM BIOS not found\n"); |
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| 224 | else |
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| 225 | printk("dmi_scan.o: SM BIOS found\n"); |
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| 226 | } |
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| 227 | |
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| 228 | #ifdef MODULE |
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| 229 | MODULE_DESCRIPTION("SM BIOS DMI Scanner"); |
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| 230 | #ifdef MODULE_LICENSE |
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| 231 | MODULE_LICENSE("GPL"); |
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| 232 | #endif |
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| 233 | EXPORT_SYMBOL(dmi_ident); |
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| 234 | EXPORT_SYMBOL(dmi_scan_mach); |
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| 235 | int init_module(void) |
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| 236 | { |
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| 237 | return 0; |
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| 238 | } |
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| 239 | |
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| 240 | int cleanup_module(void) |
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| 241 | { |
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| 242 | return 0; |
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| 243 | } |
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| 244 | |
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| 245 | #endif |
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