High resolution timer support. Implemented for x86 CPUs using TSC.
Extracted generic grub_millisleep() so it's linked in only as needed.
This requires a Pentium compatible CPU; if the RDTSC instruction is
not supported, then it falls back on the generic grub_get_time_ms()
implementation that uses the machine's RTC.
* conf/i386-pc.rmk (kernel_img_SOURCES): Add `kern/time.c',
`kern/i386/tsc.c', `kern/generic/rtc_get_time_ms.c' and
`kern/generic/millisleep.c'.
* conf/i386-efi.rmk (kernel_mod_SOURCES): Add `kern/i386/tsc.c',
`kern/generic/rtc_get_time_ms.c' and `kern/generic/millisleep.c'.
* conf/x86_64-efi.rml (kernel_mod_SOURCES): Add
`kern/generic/millisleep.c' and `kern/generic/rtc_get_time_ms.c'.
* conf/sparc64-ieee1275.rmk (kernel_elf_SOURCES): Likewise.
* conf/powerpc-ieee1275.rmk (kernel_elf_SOURCES): Add
`kern/generic/millisleep.c'.
* conf/i386-ieee1275.rmk (kernel_elf_SOURCES): Likewise.
* conf/i386-coreboot.rmk (kernel_elf_SOURCES): Add `kern/time.c'.
* kern/generic/rtc_get_time_ms.c: New file.
* kern/generic/millisleep.c: New file.
* kern/misc.c: Don't include
<kern/time.h> anymore.
(grub_millisleep_generic): Removed.
* commands/sleep.c (grub_interruptible_millisleep): Uses
grub_get_time_ms() instead of grub_get_rtc().
* include/grub/i386/tsc.h (grub_get_tsc): New file. New inline
function.
(grub_cpu_is_cpuid_supported): New inline function.
(grub_cpu_is_tsc_supported): New inline function.
(grub_tsc_init): New function prototype.
(grub_tsc_get_time_ms): New function prototype.
* kern/i386/tsc.c (grub_get_time_ms): New file.
* include/grub/time.h: Include <grub/types.h.
(grub_millisleep_generic): Removed.
(grub_get_time_ms): New prototype.
(grub_install_get_time_ms): New prototype.
(grub_rtc_get_time_ms): New prototype.
* kern/time.c (grub_get_time_ms): New function.
(grub_install_get_time_ms): New function.
* kern/i386/efi/init.c: Include <grub/cpu/tsc.h>. Don't include
<grub/time.h> anymore.
(grub_millisleep): Removed.
(grub_machine_init): Call grub_tsc_init.
* kern/i386/linuxbios/init.c (grub_machine_init): Install the RTC
get_time_ms() implementation.
* kern/sparc64/ieee1275/init.c (grub_millisleep): Removed.
(ieee1275_get_time_ms): New function.
(grub_machine_init): Install get_time_ms() implementation.
* kern/i386/pc/init.c: Include <grub/cpu/tsc.h>.
(grub_machine_init): Call grub_tsc_init().
(grub_millisleep): Removed.
* kern/ieee1275/init.c (grub_millisleep): Removed.
(grub_machine_init): Install ieee1275_get_time_ms()
implementation.
(ieee1275_get_time_ms): New function.
(grub_get_rtc): Now calls ieee1275_get_time_ms(), which does the
real work.
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