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21 results

trace_boot.c

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  • setup.c 2.59 KiB
    /*
     * Machine specific setup for xen
     *
     * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
     */
    
    #include <linux/module.h>
    #include <linux/sched.h>
    #include <linux/mm.h>
    #include <linux/pm.h>
    
    #include <asm/elf.h>
    #include <asm/e820.h>
    #include <asm/setup.h>
    #include <asm/xen/hypervisor.h>
    #include <asm/xen/hypercall.h>
    
    #include <xen/interface/physdev.h>
    #include <xen/features.h>
    
    #include "xen-ops.h"
    #include "vdso.h"
    
    /* These are code, but not functions.  Defined in entry.S */
    extern const char xen_hypervisor_callback[];
    extern const char xen_failsafe_callback[];
    
    unsigned long *phys_to_machine_mapping;
    EXPORT_SYMBOL(phys_to_machine_mapping);
    
    /**
     * machine_specific_memory_setup - Hook for machine specific memory setup.
     **/
    
    char * __init xen_memory_setup(void)
    {
    	unsigned long max_pfn = xen_start_info->nr_pages;
    
    	e820.nr_map = 0;
    	add_memory_region(0, PFN_PHYS(max_pfn), E820_RAM);
    
    	return "Xen";
    }
    
    static void xen_idle(void)
    {
    	local_irq_disable();
    
    	if (need_resched())
    		local_irq_enable();
    	else {
    		current_thread_info()->status &= ~TS_POLLING;
    		smp_mb__after_clear_bit();
    		safe_halt();
    		current_thread_info()->status |= TS_POLLING;
    	}
    }
    
    /*
     * Set the bit indicating "nosegneg" library variants should be used.
     */
    static void fiddle_vdso(void)
    {
    	extern u32 VDSO_NOTE_MASK; /* See ../kernel/vsyscall-note.S.  */
    	extern char vsyscall_int80_start;
    	u32 *mask = (u32 *) ((unsigned long) &VDSO_NOTE_MASK - VDSO_PRELINK +
    			     &vsyscall_int80_start);
    	*mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
    }
    
    void __init xen_arch_setup(void)
    {
    	struct physdev_set_iopl set_iopl;
    	int rc;
    
    	HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
    	HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
    
    	if (!xen_feature(XENFEAT_auto_translated_physmap))
    		HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
    
    	HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
    				 __KERNEL_CS, (unsigned long)xen_failsafe_callback);
    
    	set_iopl.iopl = 1;
    	rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
    	if (rc != 0)
    		printk(KERN_INFO "physdev_op failed %d\n", rc);
    
    #ifdef CONFIG_ACPI
    	if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
    		printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
    		disable_acpi();
    	}
    #endif
    
    	memcpy(boot_command_line, xen_start_info->cmd_line,
    	       MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
    	       COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
    
    	pm_idle = xen_idle;
    
    #ifdef CONFIG_SMP
    	/* fill cpus_possible with all available cpus */
    	xen_fill_possible_map();
    #endif
    
    	paravirt_disable_iospace();
    
    	fiddle_vdso();
    }