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x86: Add SMM helper functions to MP infrastructure 

In order for the cpu code to start SMM relocation 2 new
functions are added to be shared:
- void smm_initiate_relocation_parallel()
- void smm_initiate_relocation()
The both initiate an SMI on the currently running cpu.
The 2 variants allow for parallel relocation or serialized
relocation.

BUG=chrome-os-partner:22862
BRANCH=None
TEST=Built and booted rambi using these functions.

Change-Id: I325777bac27e9a0efc3f54f7223c38310604c5a2
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/173982
Reviewed-on: http://review.coreboot.org/4891
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
This commit is contained in:
Aaron Durbin 2013-10-21 22:24:40 -05:00 committed by Aaron Durbin
parent d0520406ed
commit cd3f8ad235
2 changed files with 40 additions and 0 deletions
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31
src/cpu/x86/mp_init.c
View File

@ -584,3 +584,34 @@ int mp_get_apic_id(int cpu_slot)
return cpus[cpu_slot].apic_id;
}
void smm_initiate_relocation_parallel(void)
{
if ((lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY)) {
printk(BIOS_DEBUG, "Waiting for ICR not to be busy...");
if (apic_wait_timeout(1000 /* 1 ms */, 50)) {
printk(BIOS_DEBUG, "timed out. Aborting.\n");
return;
} else
printk(BIOS_DEBUG, "done.\n");
}
lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(lapicid()));
lapic_write_around(LAPIC_ICR, LAPIC_INT_ASSERT | LAPIC_DM_SMI);
if (apic_wait_timeout(1000 /* 1 ms */, 100 /* us */)) {
printk(BIOS_DEBUG, "SMI Relocation timed out.\n");
} else
printk(BIOS_DEBUG, "Relocation complete.\n");
}
DECLARE_SPIN_LOCK(smm_relocation_lock);
/* Send SMI to self with single user serialization. */
void smm_initiate_relocation(void)
{
spin_lock(&smm_relocation_lock);
smm_initiate_relocation_parallel();
spin_unlock(&smm_relocation_lock);
}

9
src/include/cpu/x86/mp.h
View File

@ -117,4 +117,13 @@ void mp_initialize_cpu(void *unused);
/* Returns apic id for coreboot cpu number or < 0 on failure. */
int mp_get_apic_id(int cpu_slot);
/*
* SMM helpers to use with initializing CPUs.
*/
/* Send SMI to self without any serialization. */
void smm_initiate_relocation_parallel(void);
/* Send SMI to self with single execution. */
void smm_initiate_relocation(void);
#endif /* _X86_MP_H_ */