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| author | kib <kib@FreeBSD.org> | 2015-05-09 12:28:48 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2015-05-09 12:28:48 +0000 |
| commit | 6006bf3a7dfd2f9b0bf0be6700967a1ab993b8a0 (patch) | |
| tree | 4fbee808b24332d8ef01cb71eaaf6ca38551cfb9 /sys/amd64 | |
| parent | 4f7fc385cadf246ec334db975b16c0e1743e87da (diff) | |
| download | FreeBSD-src-6006bf3a7dfd2f9b0bf0be6700967a1ab993b8a0.zip FreeBSD-src-6006bf3a7dfd2f9b0bf0be6700967a1ab993b8a0.tar.gz | |
If x86 CPU implementation of the MWAIT instruction reasonably
interacts with interrupts, query ACPI and use MWAIT for entrance into
Cx sleep states. Support C1 "I/O then halt" mode. See Intel'
document 302223-007 "Intelб╝ Processor Vendor-Specific ACPI Interface
Specification" for description.
Move the acpi_cpu_c1() function into x86/cpu_machdep.c and use
it instead of inlining "sti; hlt" sequence in several places.
In the acpi(4) man page, besides documenting the dev.cpu.N.cx_methods
sysctl, correct the names for dev.cpu.N.{cx_usage,cx_lowest,cx_supported}
sysctls.
Both jkim and avg have some other patches implementing the mwait
functionality; this work is unrelated. Linux does not rely on the
ACPI to provide correct tables describing Cx modes. Instead, the
driver has pre-defined knowledge of the CPU models, it was supplied by
Intel.
Tested by: pho (previous versions)
Sponsored by: The FreeBSD Foundation
Diffstat (limited to 'sys/amd64')
| -rw-r--r-- | sys/amd64/acpica/acpi_machdep.c | 7 | ||||
| -rw-r--r-- | sys/amd64/include/md_var.h | 1 |
2 files changed, 1 insertions, 7 deletions
diff --git a/sys/amd64/acpica/acpi_machdep.c b/sys/amd64/acpica/acpi_machdep.c index 049b51bb4e..8f88a00 100644 --- a/sys/amd64/acpica/acpi_machdep.c +++ b/sys/amd64/acpica/acpi_machdep.c @@ -87,13 +87,6 @@ acpi_machdep_quirks(int *quirks) return (0); } -void -acpi_cpu_c1() -{ - - __asm __volatile("sti; hlt"); -} - /* * Support for mapping ACPI tables during early boot. Currently this * uses the crashdump map to map each table. However, the crashdump diff --git a/sys/amd64/include/md_var.h b/sys/amd64/include/md_var.h index 9083421..0813e5f 100644 --- a/sys/amd64/include/md_var.h +++ b/sys/amd64/include/md_var.h @@ -91,6 +91,7 @@ struct dumperinfo; void *alloc_fpusave(int flags); void amd64_syscall(struct thread *td, int traced); void busdma_swi(void); +bool cpu_mwait_usable(void); void cpu_probe_amdc1e(void); void cpu_setregs(void); void doreti_iret(void) __asm(__STRING(doreti_iret)); |
