diff options
Diffstat (limited to 'Documentation/x86')
| -rw-r--r-- | Documentation/x86/boot.txt | 6 | ||||
| -rw-r--r-- | Documentation/x86/pat.txt | 24 | ||||
| -rw-r--r-- | Documentation/x86/x86_64/boot-options.txt | 4 | ||||
| -rw-r--r-- | Documentation/x86/x86_64/fake-numa-for-cpusets | 2 | ||||
| -rw-r--r-- | Documentation/x86/x86_64/mm.txt | 2 |
5 files changed, 31 insertions, 7 deletions
diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt index 83c0033ee9e..fcdc62b3c3d 100644 --- a/Documentation/x86/boot.txt +++ b/Documentation/x86/boot.txt @@ -349,7 +349,7 @@ Protocol: 2.00+ 3 SYSLINUX 4 EtherBoot 5 ELILO - 7 GRuB + 7 GRUB 8 U-BOOT 9 Xen A Gujin @@ -537,8 +537,8 @@ Type: read Offset/size: 0x248/4 Protocol: 2.08+ - If non-zero then this field contains the offset from the end of the - real-mode code to the payload. + If non-zero then this field contains the offset from the beginning + of the protected-mode code to the payload. The payload may be compressed. The format of both the compressed and uncompressed data should be determined using the standard magic diff --git a/Documentation/x86/pat.txt b/Documentation/x86/pat.txt index c93ff5f4c0d..cf08c9fff3c 100644 --- a/Documentation/x86/pat.txt +++ b/Documentation/x86/pat.txt @@ -80,6 +80,30 @@ pci proc | -- | -- | WC | | | | | ------------------------------------------------------------------- +Advanced APIs for drivers +------------------------- +A. Exporting pages to users with remap_pfn_range, io_remap_pfn_range, +vm_insert_pfn + +Drivers wanting to export some pages to userspace do it by using mmap +interface and a combination of +1) pgprot_noncached() +2) io_remap_pfn_range() or remap_pfn_range() or vm_insert_pfn() + +With PAT support, a new API pgprot_writecombine is being added. So, drivers can +continue to use the above sequence, with either pgprot_noncached() or +pgprot_writecombine() in step 1, followed by step 2. + +In addition, step 2 internally tracks the region as UC or WC in memtype +list in order to ensure no conflicting mapping. + +Note that this set of APIs only works with IO (non RAM) regions. If driver +wants to export a RAM region, it has to do set_memory_uc() or set_memory_wc() +as step 0 above and also track the usage of those pages and use set_memory_wb() +before the page is freed to free pool. + + + Notes: -- in the above table mean "Not suggested usage for the API". Some of the --'s diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt index bc8a339c1f2..34c13040a71 100644 --- a/Documentation/x86/x86_64/boot-options.txt +++ b/Documentation/x86/x86_64/boot-options.txt @@ -35,7 +35,7 @@ APICs nolapic Don't use the local APIC (alias for i386 compatibility) - pirq=... See Documentation/i386/IO-APIC.txt + pirq=... See Documentation/x86/i386/IO-APIC.txt noapictimer Don't set up the APIC timer @@ -128,7 +128,7 @@ Non Executable Mappings SMP additional_cpus=NUM Allow NUM more CPUs for hotplug - (defaults are specified by the BIOS, see Documentation/x86_64/cpu-hotplug-spec) + (defaults are specified by the BIOS, see Documentation/x86/x86_64/cpu-hotplug-spec) NUMA diff --git a/Documentation/x86/x86_64/fake-numa-for-cpusets b/Documentation/x86/x86_64/fake-numa-for-cpusets index d1a985c5b00..33bb5665599 100644 --- a/Documentation/x86/x86_64/fake-numa-for-cpusets +++ b/Documentation/x86/x86_64/fake-numa-for-cpusets @@ -10,7 +10,7 @@ amount of system memory that are available to a certain class of tasks. For more information on the features of cpusets, see Documentation/cpusets.txt. There are a number of different configurations you can use for your needs. For more information on the numa=fake command line option and its various ways of -configuring fake nodes, see Documentation/x86_64/boot-options.txt. +configuring fake nodes, see Documentation/x86/x86_64/boot-options.txt. For the purposes of this introduction, we'll assume a very primitive NUMA emulation setup of "numa=fake=4*512,". This will split our system memory into diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt index efce7509736..29b52b14d0b 100644 --- a/Documentation/x86/x86_64/mm.txt +++ b/Documentation/x86/x86_64/mm.txt @@ -6,7 +6,7 @@ Virtual memory map with 4 level page tables: 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm hole caused by [48:63] sign extension ffff800000000000 - ffff80ffffffffff (=40 bits) guard hole -ffff810000000000 - ffffc0ffffffffff (=46 bits) direct mapping of all phys. memory +ffff880000000000 - ffffc0ffffffffff (=57 TB) direct mapping of all phys. memory ffffc10000000000 - ffffc1ffffffffff (=40 bits) hole ffffc20000000000 - ffffe1ffffffffff (=45 bits) vmalloc/ioremap space ffffe20000000000 - ffffe2ffffffffff (=40 bits) virtual memory map (1TB) |