diff options
Diffstat (limited to 'Documentation/x86')
| -rw-r--r-- | Documentation/x86/kernel-stacks | 13 | ||||
| -rw-r--r-- | Documentation/x86/topology.txt | 2 | ||||
| -rw-r--r-- | Documentation/x86/x86_64/mm.txt | 6 |
3 files changed, 13 insertions, 8 deletions
diff --git a/Documentation/x86/kernel-stacks b/Documentation/x86/kernel-stacks index 9a0aa4d3a866..d1bfb0b95ee0 100644 --- a/Documentation/x86/kernel-stacks +++ b/Documentation/x86/kernel-stacks @@ -59,7 +59,7 @@ If that assumption is ever broken then the stacks will become corrupt. The currently assigned IST stacks are :- -* DOUBLEFAULT_STACK. EXCEPTION_STKSZ (PAGE_SIZE). +* ESTACK_DF. EXCEPTION_STKSZ (PAGE_SIZE). Used for interrupt 8 - Double Fault Exception (#DF). @@ -68,7 +68,7 @@ The currently assigned IST stacks are :- Using a separate stack allows the kernel to recover from it well enough in many cases to still output an oops. -* NMI_STACK. EXCEPTION_STKSZ (PAGE_SIZE). +* ESTACK_NMI. EXCEPTION_STKSZ (PAGE_SIZE). Used for non-maskable interrupts (NMI). @@ -76,7 +76,7 @@ The currently assigned IST stacks are :- middle of switching stacks. Using IST for NMI events avoids making assumptions about the previous state of the kernel stack. -* DEBUG_STACK. DEBUG_STKSZ +* ESTACK_DB. EXCEPTION_STKSZ (PAGE_SIZE). Used for hardware debug interrupts (interrupt 1) and for software debug interrupts (INT3). @@ -86,7 +86,12 @@ The currently assigned IST stacks are :- avoids making assumptions about the previous state of the kernel stack. -* MCE_STACK. EXCEPTION_STKSZ (PAGE_SIZE). + To handle nested #DB correctly there exist two instances of DB stacks. On + #DB entry the IST stackpointer for #DB is switched to the second instance + so a nested #DB starts from a clean stack. The nested #DB switches + the IST stackpointer to a guard hole to catch triple nesting. + +* ESTACK_MCE. EXCEPTION_STKSZ (PAGE_SIZE). Used for interrupt 18 - Machine Check Exception (#MC). diff --git a/Documentation/x86/topology.txt b/Documentation/x86/topology.txt index 2953e3ec9a02..06b3cdbc4048 100644 --- a/Documentation/x86/topology.txt +++ b/Documentation/x86/topology.txt @@ -51,7 +51,7 @@ The topology of a system is described in the units of: The physical ID of the package. This information is retrieved via CPUID and deduced from the APIC IDs of the cores in the package. - - cpuinfo_x86.logical_id: + - cpuinfo_x86.logical_proc_id: The logical ID of the package. As we do not trust BIOSes to enumerate the packages in a consistent way, we introduced the concept of logical package diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt index 804f9426ed17..6cbe652d7a49 100644 --- a/Documentation/x86/x86_64/mm.txt +++ b/Documentation/x86/x86_64/mm.txt @@ -72,7 +72,7 @@ Complete virtual memory map with 5-level page tables Notes: - With 56-bit addresses, user-space memory gets expanded by a factor of 512x, - from 0.125 PB to 64 PB. All kernel mappings shift down to the -64 PT starting + from 0.125 PB to 64 PB. All kernel mappings shift down to the -64 PB starting offset and many of the regions expand to support the much larger physical memory supported. @@ -83,7 +83,7 @@ Notes: 0000000000000000 | 0 | 00ffffffffffffff | 64 PB | user-space virtual memory, different per mm __________________|____________|__________________|_________|___________________________________________________________ | | | | - 0000800000000000 | +64 PB | ffff7fffffffffff | ~16K PB | ... huge, still almost 64 bits wide hole of non-canonical + 0100000000000000 | +64 PB | feffffffffffffff | ~16K PB | ... huge, still almost 64 bits wide hole of non-canonical | | | | virtual memory addresses up to the -64 PB | | | | starting offset of kernel mappings. __________________|____________|__________________|_________|___________________________________________________________ @@ -99,7 +99,7 @@ ____________________________________________________________|___________________ ffd2000000000000 | -11.5 PB | ffd3ffffffffffff | 0.5 PB | ... unused hole ffd4000000000000 | -11 PB | ffd5ffffffffffff | 0.5 PB | virtual memory map (vmemmap_base) ffd6000000000000 | -10.5 PB | ffdeffffffffffff | 2.25 PB | ... unused hole - ffdf000000000000 | -8.25 PB | fffffdffffffffff | ~8 PB | KASAN shadow memory + ffdf000000000000 | -8.25 PB | fffffbffffffffff | ~8 PB | KASAN shadow memory __________________|____________|__________________|_________|____________________________________________________________ | | Identical layout to the 47-bit one from here on: |