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/Linux-v5.4/Documentation/x86/
Dpat.rst4 PAT (Page Attribute Table)
7 x86 Page Attribute Table (PAT) allows for setting the memory attribute at the
8 page level granularity. PAT is complementary to the MTRR settings which allows
9 for setting of memory types over physical address ranges. However, PAT is
16 PAT allows for different types of memory attributes. The most commonly used
28 PAT APIs
110 With PAT support, a new API pgprot_writecombine is being added. So, drivers can
122 MTRR effects on PAT / non-PAT systems
126 using ioremap*() calls on x86 for both non-PAT and PAT systems. Ideally
128 be a no-op on PAT enabled systems. The region over which a arch_phys_wc_add()
[all …]
Dmtrr.rst14 MTRR use is replaced on modern x86 hardware with PAT. Direct MTRR use by
17 non-PAT systems while a no-op but equally effective on PAT enabled systems.
/Linux-v5.4/arch/x86/mm/
Dpat.c211 #define PAT(x, y) ((u64)PAT_ ## y << ((x)*8)) macro
286 pat = PAT(0, WB) | PAT(1, WT) | PAT(2, UC_MINUS) | PAT(3, UC) | in init_cache_modes()
287 PAT(4, WB) | PAT(5, WT) | PAT(6, UC_MINUS) | PAT(7, UC); in init_cache_modes()
334 pat = PAT(0, WB) | PAT(1, WC) | PAT(2, UC_MINUS) | PAT(3, UC) | in pat_init()
335 PAT(4, WB) | PAT(5, WC) | PAT(6, UC_MINUS) | PAT(7, UC); in pat_init()
363 pat = PAT(0, WB) | PAT(1, WC) | PAT(2, UC_MINUS) | PAT(3, UC) | in pat_init()
364 PAT(4, WB) | PAT(5, WP) | PAT(6, UC_MINUS) | PAT(7, WT); in pat_init()
375 #undef PAT
/Linux-v5.4/drivers/media/pci/ivtv/
DKconfig77 bool "force cx23415 framebuffer init with x86 PAT enabled"
80 With PAT enabled, the cx23415 framebuffer driver does not
83 when initializied on a kernel with PAT enabled (i.e. not
86 The driver is not easily upgradable to the PAT-aware
91 PAT-enabled systems but the framebuffer memory will be uncached.
/Linux-v5.4/drivers/media/i2c/
Dsaa6752hs.c115 static const u8 PAT[] = { variable
462 memcpy(localPAT, PAT, sizeof(PAT)); in saa6752hs_init()
465 crc = crc32_be(~0, &localPAT[7], sizeof(PAT) - 7 - 4); in saa6752hs_init()
466 localPAT[sizeof(PAT) - 4] = (crc >> 24) & 0xFF; in saa6752hs_init()
467 localPAT[sizeof(PAT) - 3] = (crc >> 16) & 0xFF; in saa6752hs_init()
468 localPAT[sizeof(PAT) - 2] = (crc >> 8) & 0xFF; in saa6752hs_init()
469 localPAT[sizeof(PAT) - 1] = crc & 0xFF; in saa6752hs_init()
503 i2c_master_send(client, localPAT, sizeof(PAT)); in saa6752hs_init()
/Linux-v5.4/arch/x86/kvm/
Dcpuid.c452 F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLUSH) | in __do_cpuid_func()
462 F(PAT) | F(PSE36) | 0 /* Reserved */ | in __do_cpuid_func()
/Linux-v5.4/Documentation/vm/
Dhighmem.rst142 like NX and PAT.
/Linux-v5.4/arch/x86/
DKconfig1846 prompt "x86 PAT support" if EXPERT
1849 Use PAT attributes to setup page level cache control.
/Linux-v5.4/lib/
DKconfig.debug2101 be used by people debugging the kernel. Note that with PAT support
/Linux-v5.4/Documentation/admin-guide/
Dkernel-parameters.txt816 debugpat [X86] Enable PAT debugging
3137 nopat [X86] Disable PAT (page attribute table extension of