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| author | Oliver O'Halloran <oohall@gmail.com> | 2016-07-01 09:20:39 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-07-05 16:58:53 +0300 |
| commit | 799010244685334b34e674d354a1a71a3a6b6148 (patch) | |
| tree | c689fe80239f447d33866dc2af3ed2d1603937bc /arch/powerpc/include/asm/reg.h | |
| parent | 9ddf0075f9184f1e1dabf7bfea6397b00ee17e46 (diff) | |
| download | linux-799010244685334b34e674d354a1a71a3a6b6148.tar.xz | |
powerpc/timer: Large Decrementer support
Power ISAv3 adds a large decrementer (LD) mode which increases the size
of the decrementer register. The size of the enlarged decrementer
register is between 32 and 64 bits with the exact size being dependent
on the implementation. When in LD mode, reads are sign extended to 64
bits and a decrementer exception is raised when the high bit is set (i.e
the value goes below zero). Writes however are truncated to the physical
register width so some care needs to be taken to ensure that the high
bit is not set when reloading the decrementer. This patch adds support
for using the LD inside the host kernel on processors that support it.
When LD mode is supported firmware will supply the ibm,dec-bits property
for CPU nodes to allow the kernel to determine the maximum decrementer
value. Enabling LD mode is a hypervisor privileged operation so the kernel
can only enable it manually when running in hypervisor mode. Guests that
support LD mode can request it using the "ibm,client-architecture-support"
firmware call (not implemented in this patch) or some other platform
specific method. If this property is not supplied then the traditional
decrementer width of 32 bit is assumed and LD mode will not be enabled.
This patch was based on initial work by Jack Miller.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/reg.h')
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index ce44fe27f48f..320136f5fe28 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -337,6 +337,7 @@ #define LPCR_AIL_0 0x00000000 /* MMU off exception offset 0x0 */ #define LPCR_AIL_3 0x01800000 /* MMU on exception offset 0xc00...4xxx */ #define LPCR_ONL 0x00040000 /* online - PURR/SPURR count */ +#define LPCR_LD 0x00020000 /* large decremeter */ #define LPCR_PECE 0x0001f000 /* powersave exit cause enable */ #define LPCR_PECEDP 0x00010000 /* directed priv dbells cause exit */ #define LPCR_PECEDH 0x00008000 /* directed hyp dbells cause exit */ |