1 /******************************************************************************
2 * arch/ia64/xen/xen_pv_ops.c
4 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
5 * VA Linux Systems Japan K.K.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/console.h>
24 #include <linux/irq.h>
25 #include <linux/kernel.h>
28 #include <asm/xen/hypervisor.h>
29 #include <asm/xen/xencomm.h>
30 #include <asm/xen/privop.h>
35 /***************************************************************************
38 static struct pv_info xen_info __initdata
= {
39 .kernel_rpl
= 2, /* or 1: determin at runtime */
40 .paravirt_enabled
= 1,
44 #define IA64_RSC_PL_SHIFT 2
45 #define IA64_RSC_PL_BIT_SIZE 2
46 #define IA64_RSC_PL_MASK \
47 (((1UL << IA64_RSC_PL_BIT_SIZE) - 1) << IA64_RSC_PL_SHIFT)
52 /* Xenified Linux/ia64 may run on pl = 1 or 2.
53 * determin at run time. */
54 unsigned long rsc
= ia64_getreg(_IA64_REG_AR_RSC
);
55 unsigned int rpl
= (rsc
& IA64_RSC_PL_MASK
) >> IA64_RSC_PL_SHIFT
;
56 xen_info
.kernel_rpl
= rpl
;
59 /***************************************************************************
61 * initialization hooks.
65 xen_panic_hypercall(struct unw_frame_info
*info
, void *arg
)
67 current
->thread
.ksp
= (__u64
)info
->sw
- 16;
68 HYPERVISOR_shutdown(SHUTDOWN_crash
);
69 /* we're never actually going to get here... */
73 xen_panic_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
75 unw_init_running(xen_panic_hypercall
, NULL
);
76 /* we're never actually going to get here... */
80 static struct notifier_block xen_panic_block
= {
81 xen_panic_event
, NULL
, 0 /* try to go last */
84 static void xen_pm_power_off(void)
87 HYPERVISOR_shutdown(SHUTDOWN_poweroff
);
94 "Running on Xen! pl = %d start_info_pfn=0x%lx nr_pages=%ld "
97 HYPERVISOR_shared_info
->arch
.start_info_pfn
,
98 xen_start_info
->nr_pages
, xen_start_info
->flags
);
102 xen_reserve_memory(struct rsvd_region
*region
)
104 region
->start
= (unsigned long)__va(
105 (HYPERVISOR_shared_info
->arch
.start_info_pfn
<< PAGE_SHIFT
));
106 region
->end
= region
->start
+ PAGE_SIZE
;
111 xen_arch_setup_early(void)
113 struct shared_info
*s
;
114 BUG_ON(!xen_pv_domain());
116 s
= HYPERVISOR_shared_info
;
117 xen_start_info
= __va(s
->arch
.start_info_pfn
<< PAGE_SHIFT
);
119 /* Must be done before any hypercall. */
120 xencomm_initialize();
122 xen_setup_features();
123 /* Register a call for panic conditions. */
124 atomic_notifier_chain_register(&panic_notifier_list
,
126 pm_power_off
= xen_pm_power_off
;
128 xen_ia64_enable_opt_feature();
132 xen_arch_setup_console(char **cmdline_p
)
134 add_preferred_console("xenboot", 0, NULL
);
135 add_preferred_console("tty", 0, NULL
);
137 add_preferred_console("hvc", 0, NULL
);
139 #if !defined(CONFIG_VT) || !defined(CONFIG_DUMMY_CONSOLE)
145 xen_arch_setup_nomca(void)
151 xen_post_smp_prepare_boot_cpu(void)
153 xen_setup_vcpu_info_placement();
156 static const struct pv_init_ops xen_init_ops __initconst
= {
157 .banner
= xen_banner
,
159 .reserve_memory
= xen_reserve_memory
,
161 .arch_setup_early
= xen_arch_setup_early
,
162 .arch_setup_console
= xen_arch_setup_console
,
163 .arch_setup_nomca
= xen_arch_setup_nomca
,
165 .post_smp_prepare_boot_cpu
= xen_post_smp_prepare_boot_cpu
,
168 /***************************************************************************
173 static void xen_setreg(int regnum
, unsigned long val
)
176 case _IA64_REG_AR_KR0
... _IA64_REG_AR_KR7
:
177 xen_set_kr(regnum
- _IA64_REG_AR_KR0
, val
);
179 #ifdef CONFIG_IA32_SUPPORT
180 case _IA64_REG_AR_EFLAG
:
184 case _IA64_REG_CR_TPR
:
187 case _IA64_REG_CR_ITM
:
190 case _IA64_REG_CR_EOI
:
194 ia64_native_setreg_func(regnum
, val
);
199 static unsigned long xen_getreg(int regnum
)
207 #ifdef CONFIG_IA32_SUPPORT
208 case _IA64_REG_AR_EFLAG
:
209 res
= xen_get_eflag();
212 case _IA64_REG_CR_IVR
:
215 case _IA64_REG_CR_TPR
:
219 res
= ia64_native_getreg_func(regnum
);
225 /* turning on interrupts is a bit more complicated.. write to the
226 * memory-mapped virtual psr.i bit first (to avoid race condition),
227 * then if any interrupts were pending, we have to execute a hyperprivop
228 * to ensure the pending interrupt gets delivered; else we're done! */
232 int old
= xen_get_virtual_psr_i();
233 xen_set_virtual_psr_i(1);
235 if (!old
&& xen_get_virtual_pend())
239 /* turning off interrupts can be paravirtualized simply by writing
240 * to a memory-mapped virtual psr.i bit (implemented as a 16-bit bool) */
244 xen_set_virtual_psr_i(0);
251 return xen_get_virtual_psr_i() ? IA64_PSR_I
: 0;
255 xen_intrin_local_irq_restore(unsigned long mask
)
257 if (mask
& IA64_PSR_I
)
263 static const struct pv_cpu_ops xen_cpu_ops __initdata
= {
266 .get_cpuid
= xen_get_cpuid
,
267 .get_pmd
= xen_get_pmd
,
268 .getreg
= xen_getreg
,
269 .setreg
= xen_setreg
,
271 .get_rr
= xen_get_rr
,
272 .set_rr
= xen_set_rr
,
273 .set_rr0_to_rr4
= xen_set_rr0_to_rr4
,
276 .get_psr_i
= xen_get_psr_i
,
277 .intrin_local_irq_restore
278 = xen_intrin_local_irq_restore
,
281 /******************************************************************************
282 * replacement of hand written assembly codes.
285 extern char xen_switch_to
;
286 extern char xen_leave_syscall
;
287 extern char xen_work_processed_syscall
;
288 extern char xen_leave_kernel
;
290 const struct pv_cpu_asm_switch xen_cpu_asm_switch
= {
291 .switch_to
= (unsigned long)&xen_switch_to
,
292 .leave_syscall
= (unsigned long)&xen_leave_syscall
,
293 .work_processed_syscall
= (unsigned long)&xen_work_processed_syscall
,
294 .leave_kernel
= (unsigned long)&xen_leave_kernel
,
297 /***************************************************************************
299 * iosapic read/write hooks.
302 xen_pcat_compat_init(void)
307 static struct irq_chip
*
308 xen_iosapic_get_irq_chip(unsigned long trigger
)
314 xen_iosapic_read(char __iomem
*iosapic
, unsigned int reg
)
316 struct physdev_apic apic_op
;
319 apic_op
.apic_physbase
= (unsigned long)iosapic
-
320 __IA64_UNCACHED_OFFSET
;
322 ret
= HYPERVISOR_physdev_op(PHYSDEVOP_apic_read
, &apic_op
);
325 return apic_op
.value
;
329 xen_iosapic_write(char __iomem
*iosapic
, unsigned int reg
, u32 val
)
331 struct physdev_apic apic_op
;
333 apic_op
.apic_physbase
= (unsigned long)iosapic
-
334 __IA64_UNCACHED_OFFSET
;
337 HYPERVISOR_physdev_op(PHYSDEVOP_apic_write
, &apic_op
);
340 static const struct pv_iosapic_ops xen_iosapic_ops __initconst
= {
341 .pcat_compat_init
= xen_pcat_compat_init
,
342 .__get_irq_chip
= xen_iosapic_get_irq_chip
,
344 .__read
= xen_iosapic_read
,
345 .__write
= xen_iosapic_write
,
348 /***************************************************************************
349 * pv_ops initialization
353 xen_setup_pv_ops(void)
357 pv_init_ops
= xen_init_ops
;
358 pv_cpu_ops
= xen_cpu_ops
;
359 pv_iosapic_ops
= xen_iosapic_ops
;
360 pv_irq_ops
= xen_irq_ops
;
361 pv_time_ops
= xen_time_ops
;
363 paravirt_cpu_asm_init(&xen_cpu_asm_switch
);