| /* |
| * 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/vdso.h> |
| #include <asm/e820.h> |
| #include <asm/setup.h> |
| #include <asm/acpi.h> |
| #include <asm/xen/hypervisor.h> |
| #include <asm/xen/hypercall.h> |
| |
| #include <xen/page.h> |
| #include <xen/interface/callback.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[]; |
| |
| |
| /** |
| * 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; |
| |
| max_pfn = min(MAX_DOMAIN_PAGES, max_pfn); |
| |
| e820.nr_map = 0; |
| |
| e820_add_region(0, PFN_PHYS(max_pfn), E820_RAM); |
| |
| /* |
| * Even though this is normal, usable memory under Xen, reserve |
| * ISA memory anyway because too many things think they can poke |
| * about in there. |
| */ |
| e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, |
| E820_RESERVED); |
| |
| /* |
| * Reserve Xen bits: |
| * - mfn_list |
| * - xen_start_info |
| * See comment above "struct start_info" in <xen/interface/xen.h> |
| */ |
| e820_add_region(__pa(xen_start_info->mfn_list), |
| xen_start_info->pt_base - xen_start_info->mfn_list, |
| E820_RESERVED); |
| |
| sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); |
| |
| 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 __init fiddle_vdso(void) |
| { |
| extern const char vdso32_default_start; |
| u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK); |
| *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT; |
| } |
| |
| void xen_enable_sysenter(void) |
| { |
| int cpu = smp_processor_id(); |
| extern void xen_sysenter_target(void); |
| /* Mask events on entry, even though they get enabled immediately */ |
| static struct callback_register sysenter = { |
| .type = CALLBACKTYPE_sysenter, |
| .address = XEN_CALLBACK(__KERNEL_CS, xen_sysenter_target), |
| .flags = CALLBACKF_mask_events, |
| }; |
| |
| if (!boot_cpu_has(X86_FEATURE_SEP) || |
| HYPERVISOR_callback_op(CALLBACKOP_register, &sysenter) != 0) { |
| clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SEP); |
| clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SEP); |
| } |
| } |
| |
| 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); |
| |
| xen_enable_sysenter(); |
| |
| 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; |
| |
| paravirt_disable_iospace(); |
| |
| fiddle_vdso(); |
| } |