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X86: make the SIPI num_starts a config variable

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The code to figure out how to set num_starts was
starting to get kludgy. It's a constant for a given
CPU; constants should be constant; make it a config variable.

This change includes an example of how to override it.
Build but not boot tested; drivers welcome.

Change-Id: Iddd906a707bb16251615c7b42f2bfb5a044379b4
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/3796
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-by: Bruce Griffith <Bruce.Griffith@se-eng.com>
This commit is contained in:
Ronald G. Minnich
2013-07-22 20:17:18 +02:00
parent 4c2ebeba78
commit b5e777c433
3 changed files with 16 additions and 9 deletions
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12
src/cpu/x86/lapic/lapic_cpu_init.c
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@@ -101,7 +101,7 @@ static int lapic_start_cpu(unsigned long apicid)
{
int timeout;
unsigned long send_status, accept_status;
int j, num_starts, maxlvt;
int j, maxlvt;
/*
* Starting actual IPI sequence...
@@ -167,20 +167,14 @@ static int lapic_start_cpu(unsigned long apicid)
return 0;
}
#if !CONFIG_CPU_AMD_MODEL_10XXX
num_starts = 2;
#else
num_starts = 1;
#endif
/*
* Run STARTUP IPI loop.
*/
printk(BIOS_SPEW, "#startup loops: %d.\n", num_starts);
printk(BIOS_SPEW, "#startup loops: %d.\n", CONFIG_NUM_IPI_STARTS);
maxlvt = 4;
for (j = 1; j <= num_starts; j++) {
for (j = 1; j <= CONFIG_NUM_IPI_STARTS; j++) {
printk(BIOS_SPEW, "Sending STARTUP #%d to %lu.\n", j, apicid);
lapic_read_around(LAPIC_SPIV);
lapic_write(LAPIC_ESR, 0);