xen/arch/ia64/xen/domain.c


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/*
 *  Copyright (C) 1995  Linus Torvalds
 *
 *  Pentium III FXSR, SSE support
 *	Gareth Hughes <gareth@valinux.com>, May 2000
 *
 *  Copyright (C) 2005 Intel Co
 *	Kun Tian (Kevin Tian) <kevin.tian@intel.com>
 *
 * 05/04/29 Kun Tian (Kevin Tian) <kevin.tian@intel.com> Add VTI domain support
 */

#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/errno.h>
#include <xen/sched.h>
#include <xen/smp.h>
#include <xen/delay.h>
#include <xen/softirq.h>
#include <xen/mm.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/desc.h>
#include <asm/hw_irq.h>
//#include <asm/mpspec.h>
#include <xen/irq.h>
#include <xen/event.h>
//#include <xen/shadow.h>
#include <xen/console.h>
#include <xen/compile.h>

#include <xen/elf.h>
//#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/dma.h>	/* for MAX_DMA_ADDRESS */

#include <asm/asm-offsets.h>  /* for IA64_THREAD_INFO_SIZE */

#include <asm/vcpu.h>   /* for function declarations */
#include <public/arch-ia64.h>
#include <asm/vmx.h>
#include <asm/vmx_vcpu.h>
#include <asm/vmx_vpd.h>
#include <asm/pal.h>
#include <public/io/ioreq.h>

#define CONFIG_DOMAIN0_CONTIGUOUS
unsigned long dom0_start = -1L;
unsigned long dom0_size = 512*1024*1024;
unsigned long dom0_align = 64*1024*1024;

// initialized by arch/ia64/setup.c:find_initrd()
unsigned long initrd_start = 0, initrd_end = 0;
extern unsigned long running_on_sim;

#define IS_XEN_ADDRESS(d,a) ((a >= d->xen_vastart) && (a <= d->xen_vaend))

//extern int loadelfimage(char *);
extern int readelfimage_base_and_size(char *, unsigned long,
	              unsigned long *, unsigned long *, unsigned long *);

unsigned long map_domain_page0(struct domain *);
extern unsigned long dom_fw_setup(struct domain *, char *, int);

/* this belongs in include/asm, but there doesn't seem to be a suitable place */
void free_perdomain_pt(struct domain *d)
{
	printf("free_perdomain_pt: not implemented\n");
	//free_page((unsigned long)d->mm.perdomain_pt);
}

static void default_idle(void)
{
	int cpu = smp_processor_id();
	local_irq_disable();
	if ( !softirq_pending(cpu))
	        safe_halt();
	local_irq_enable();
}

static void continue_cpu_idle_loop(void)
{
	int cpu = smp_processor_id();
	for ( ; ; )
	{
	printf ("idle%dD\n", cpu);
#ifdef IA64
//        __IRQ_STAT(cpu, idle_timestamp) = jiffies
#else
	    irq_stat[cpu].idle_timestamp = jiffies;
#endif
	    while ( !softirq_pending(cpu) )
	        default_idle();
	    add_preempt_count(SOFTIRQ_OFFSET);
	    raise_softirq(SCHEDULE_SOFTIRQ);
	    do_softirq();
	    sub_preempt_count(SOFTIRQ_OFFSET);
	}
}

void startup_cpu_idle_loop(void)
{
	int cpu = smp_processor_id ();
	/* Just some sanity to ensure that the scheduler is set up okay. */
	ASSERT(current->domain == IDLE_DOMAIN_ID);
	printf ("idle%dA\n", cpu);
	raise_softirq(SCHEDULE_SOFTIRQ);
#if 0   /* All this work is done within continue_cpu_idle_loop  */
	printf ("idle%dB\n", cpu);
	asm volatile ("mov ar.k2=r0");
	do_softirq();
	printf ("idle%dC\n", cpu);

	/*
	 * Declares CPU setup done to the boot processor.
	 * Therefore memory barrier to ensure state is visible.
	 */
	smp_mb();
#endif
#if 0
//do we have to ensure the idle task has a shared page so that, for example,
//region registers can be loaded from it.  Apparently not...
	idle0_task.shared_info = (void *)alloc_xenheap_page();
	memset(idle0_task.shared_info, 0, PAGE_SIZE);
	/* pin mapping */
	// FIXME: Does this belong here?  Or do only at domain switch time?
	{
		/* WARNING: following must be inlined to avoid nested fault */
		unsigned long psr = ia64_clear_ic();
		ia64_itr(0x2, IA64_TR_SHARED_INFO, SHAREDINFO_ADDR,
		 pte_val(pfn_pte(ia64_tpa(idle0_task.shared_info) >> PAGE_SHIFT, PAGE_KERNEL)),
		 PAGE_SHIFT);
		ia64_set_psr(psr);
		ia64_srlz_i();
	}
#endif

	continue_cpu_idle_loop();
}

struct vcpu *alloc_vcpu_struct(struct domain *d, unsigned int vcpu_id)
{
	struct vcpu *v;

	if ((v = alloc_xenheap_pages(KERNEL_STACK_SIZE_ORDER)) == NULL)
		return NULL;

	memset(v, 0, sizeof(*v)); 
        memcpy(&v->arch, &idle0_vcpu.arch, sizeof(v->arch));
	v->arch.privregs = 
		alloc_xenheap_pages(get_order(sizeof(mapped_regs_t)));
	printf("arch_vcpu_info=%p\n", v->arch.privregs);
	memset(v->arch.privregs, 0, PAGE_SIZE);

	return v;
}

void free_vcpu_struct(struct vcpu *v)
{
	free_xenheap_pages(v, KERNEL_STACK_SIZE_ORDER);
}

static void init_switch_stack(struct vcpu *v)
{
	struct pt_regs *regs = (struct pt_regs *) ((unsigned long) v + IA64_STK_OFFSET) - 1;
	struct switch_stack *sw = (struct switch_stack *) regs - 1;
	extern void ia64_ret_from_clone;

	memset(sw, 0, sizeof(struct switch_stack) + sizeof(struct pt_regs));
	sw->ar_bspstore = (unsigned long)v + IA64_RBS_OFFSET;
	sw->b0 = (unsigned long) &ia64_ret_from_clone;
	sw->ar_fpsr = FPSR_DEFAULT;
	v->arch._thread.ksp = (unsigned long) sw - 16;
	// stay on kernel stack because may get interrupts!
	// ia64_ret_from_clone (which b0 gets in new_thread) switches