arch/x86/mtrr.rst

73   reg00: base=0x00000000 (   0MB), size= 128MB: write-back, count=1
74   reg01: base=0x08000000 ( 128MB), size=  64MB: write-back, count=1
78   # echo "base=0xf8000000 size=0x400000 type=write-combining" >! /proc/mtrr
82   # echo "base=0xf8000000 size=0x400000 type=write-combining" >| /proc/mtrr
87   reg00: base=0x00000000 (   0MB), size= 128MB: write-back, count=1
88   reg01: base=0x08000000 ( 128MB), size=  64MB: write-back, count=1
89   reg02: base=0xf8000000 (3968MB), size=   4MB: write-combining, count=1
91 This is for video RAM at base address 0xf8000000 and size 4 megabytes. To
96   (--) S3: PCI: 968 rev 0, Linear FB @ 0xf8000000
107 That's 4 megabytes, which is 0x400000 bytes (in hexadecimal).
118   %echo "base=0xfb000000 size=0x1000000 type=write-combining" >/proc/mtrr
119   %echo "base=0xfb000000 size=0x1000 type=uncachable" >/proc/mtrr
124   reg00: base=0x00000000 (   0MB), size=  64MB: write-back, count=1
125   reg01: base=0xfb000000 (4016MB), size=  16MB: write-combining, count=1
126   reg02: base=0xfb000000 (4016MB), size=   4kB: uncachable, count=1
198   #define FALSE 0
203       "uncachable",               /* 0 */
217       if ( ( fd = open ("/proc/mtrr", O_RDONLY, 0) ) == -1 )
228       for (gentry.regnum = 0; ioctl (fd, MTRRIOC_GET_ENTRY, &gentry) == 0;
236     fprintf (stderr, "Register: %u base: 0x%lx size: 0x%lx type: %s\n",
240       if (errno == EINVAL) exit (0);
298   #define FALSE 0
303       "uncachable",               /* 0 */
322       sentry.base = strtoul (argv[1], NULL, 0);
323       sentry.size = strtoul (argv[2], NULL, 0);
324       for (sentry.type = 0; sentry.type < MTRR_NUM_TYPES; ++sentry.type)
326     if (strcmp (argv[3], mtrr_strings[sentry.type]) == 0) break;
333       if ( ( fd = open ("/proc/mtrr", O_WRONLY, 0) ) == -1 )