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Add new ports: i386-xen and x86_64-xen. This allows running GRUB in

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XEN PV environment and load kernels.
This commit is contained in:
Vladimir Serbinenko 2013-11-09 21:29:11 +01:00
parent 1a46a3a4b3
commit 9612ebc00e
59 changed files with 4167 additions and 259 deletions
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21
grub-core/kern/i386/tsc.c
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@ -25,7 +25,11 @@
#include <grub/misc.h>
#include <grub/i386/tsc.h>
#include <grub/i386/cpuid.h>
#ifdef GRUB_MACHINE_XEN
#include <grub/xen.h>
#else
#include <grub/i386/pit.h>
#endif
#include <grub/cpu/io.h>
/* This defines the value TSC had at the epoch (that is, when we calibrated it). */
@ -65,6 +69,8 @@ grub_cpu_is_tsc_supported (void)
return (d & (1 << 4)) != 0;
}
#ifndef GRUB_MACHINE_XEN
static void
grub_pit_wait (grub_uint16_t tics)
{
@ -92,6 +98,7 @@ grub_pit_wait (grub_uint16_t tics)
& ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
GRUB_PIT_SPEAKER_PORT);
}
#endif
static grub_uint64_t
grub_tsc_get_time_ms (void)
@ -103,6 +110,7 @@ grub_tsc_get_time_ms (void)
return ((al * grub_tsc_rate) >> 32) + ah * grub_tsc_rate;
}
#ifndef GRUB_MACHINE_XEN
/* Calibrate the TSC based on the RTC. */
static void
calibrate_tsc (void)
@ -116,10 +124,22 @@ calibrate_tsc (void)
grub_tsc_rate = grub_divmod64 ((55ULL << 32), end_tsc - tsc_boot_time, 0);
}
#endif
void
grub_tsc_init (void)
{
#ifdef GRUB_MACHINE_XEN
grub_uint64_t t;
tsc_boot_time = grub_get_tsc ();
t = grub_xen_shared_info->vcpu_info[0].time.tsc_to_system_mul;
if (grub_xen_shared_info->vcpu_info[0].time.tsc_shift > 0)
t <<= grub_xen_shared_info->vcpu_info[0].time.tsc_shift;
else
t >>= -grub_xen_shared_info->vcpu_info[0].time.tsc_shift;
grub_tsc_rate = grub_divmod64 (t, 1000000, 0);
grub_install_get_time_ms (grub_tsc_get_time_ms);
#else
if (grub_cpu_is_tsc_supported ())
{
calibrate_tsc ();
@ -133,4 +153,5 @@ grub_tsc_init (void)
grub_fatal ("no TSC found");
#endif
}
#endif
}