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#include <console/console.h>
#include <cpu/cpu.h>
#include <mem.h>
#include <arch/io.h>
#include <string.h>
#include <cpu/cpufixup.h>
#include <smp/start_stop.h>
#include <cpu/cpufixup.h>
#include <cpu/p6/mtrr.h>
#include <cpu/p6/msr.h>
#include <cpu/p6/apic.h>
#include <cpu/p5/cpuid.h>
#if 0
#include <cpu/l2_cache.h>
#endif
#if CONFIG_SMP || CONFIG_IOAPIC
#define APIC 1
#endif
static void cache_on(struct mem_range *mem)
{
post_code(0x60);
printk_info("Enabling cache...");
/* we need an #ifdef i586 here at some point ... */
__asm__ __volatile__("mov %cr0, %eax\n\t"
"and $0x9fffffff,%eax\n\t"
"mov %eax, %cr0\n\t");
/* turns out cache isn't really on until you set MTRR registers on
* 686 and later.
* NOTHING FANCY. Linux does a much better job anyway.
* so absolute minimum needed to get it going.
*/
/* OK, linux it turns out does nothing. We have to do it ... */
#if defined(i686)
// totalram here is in linux sizing, i.e. units of KB.
// set_mtrr is responsible for getting it into the right units!
setup_mtrrs(mem);
#endif
post_code(0x6A);
printk_info("done.\n");
}
static void interrupts_on()
{
/* this is so interrupts work. This is very limited scope --
* linux will do better later, we hope ...
*/
/* this is the first way we learned to do it. It fails on real SMP
* stuff. So we have to do things differently ...
* see the Intel mp1.4 spec, page A-3
*/
#if defined(APIC)
/* Only Pentium Pro and later have those MSR stuff */
unsigned long low, high;
printk_info("Setting up local apic...");
/* Enable the local apic */
rdmsr(APIC_BASE_MSR, low, high);
low |= APIC_BASE_MSR_ENABLE;
low &= ~APIC_BASE_MSR_ADDR_MASK;
low |= APIC_DEFAULT_BASE;
wrmsr(APIC_BASE_MSR, low, high);
/* Put the local apic in virtual wire mode */
apic_write_around(APIC_SPIV,
(apic_read_around(APIC_SPIV) & ~(APIC_VECTOR_MASK))
| APIC_SPIV_ENABLE);
apic_write_around(APIC_LVT0,
(apic_read_around(APIC_LVT0) &
~(APIC_LVT_MASKED | APIC_LVT_LEVEL_TRIGGER |
APIC_LVT_REMOTE_IRR | APIC_INPUT_POLARITY |
APIC_SEND_PENDING |APIC_LVT_RESERVED_1 |
APIC_DELIVERY_MODE_MASK))
| (APIC_LVT_REMOTE_IRR |APIC_SEND_PENDING |
APIC_DELIVERY_MODE_EXTINT)
);
apic_write_around(APIC_LVT1,
(apic_read_around(APIC_LVT1) &
~(APIC_LVT_MASKED | APIC_LVT_LEVEL_TRIGGER |
APIC_LVT_REMOTE_IRR | APIC_INPUT_POLARITY |
APIC_SEND_PENDING |APIC_LVT_RESERVED_1 |
APIC_DELIVERY_MODE_MASK))
| (APIC_LVT_REMOTE_IRR |APIC_SEND_PENDING |
APIC_DELIVERY_MODE_NMI)
);
#else /* APIC */
#ifdef i686
/* Only Pentium Pro and later have those MSR stuff */
unsigned long low, high;
printk_info("Disabling local apic...");
rdmsr(APIC_BASE_MSR, low, high);
low &= ~APIC_BASE_MSR_ENABLE;
wrmsr(APIC_BASE_MSR, low, high);
#endif /* i686 */
#endif /* APIC */
printk_info("done.\n");
post_code(0x9b);
}
unsigned long cpu_initialize(struct mem_range *mem)
{
/* Because we busy wait at the printk spinlock.
* It is important to keep the number of printed messages
* from secondary cpus to a minimum, when debugging is
* disabled.
*/
unsigned long processor_id = this_processors_id();
printk_notice("Initializing CPU #%d\n", processor_id);
/* some cpus need a fixup done. This is the hook for doing that. */
cpufixup(mem);
/* Turn on caching if we haven't already */
cache_on(mem);
display_cpuid();
mtrr_check();
#if 0
/* now that everything is really up, enable the l2 cache if desired.
* The enable can wait until this point, because linuxbios and it's
* data areas are tiny, easily fitting into the L1 cache.
*/
configure_l2_cache();
#endif
interrupts_on();
printk_info("CPU #%d Initialized\n", processor_id);
return processor_id;
}
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