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linux-stable-rt/arch/ia64/xen/xen_pv_ops.c

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/******************************************************************************
* arch/ia64/xen/xen_pv_ops.c
*
* Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
* VA Linux Systems Japan K.K.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/console.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/pm.h>
#include <linux/unistd.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/xencomm.h>
#include <asm/xen/privop.h>
#include "irq_xen.h"
#include "time.h"
/***************************************************************************
* general info
*/
static struct pv_info xen_info __initdata = {
.kernel_rpl = 2, /* or 1: determin at runtime */
.paravirt_enabled = 1,
.name = "Xen/ia64",
};
#define IA64_RSC_PL_SHIFT 2
#define IA64_RSC_PL_BIT_SIZE 2
#define IA64_RSC_PL_MASK \
(((1UL << IA64_RSC_PL_BIT_SIZE) - 1) << IA64_RSC_PL_SHIFT)
static void __init
xen_info_init(void)
{
/* Xenified Linux/ia64 may run on pl = 1 or 2.
* determin at run time. */
unsigned long rsc = ia64_getreg(_IA64_REG_AR_RSC);
unsigned int rpl = (rsc & IA64_RSC_PL_MASK) >> IA64_RSC_PL_SHIFT;
xen_info.kernel_rpl = rpl;
}
/***************************************************************************
* pv_init_ops
* initialization hooks.
*/
static void
xen_panic_hypercall(struct unw_frame_info *info, void *arg)
{
current->thread.ksp = (__u64)info->sw - 16;
HYPERVISOR_shutdown(SHUTDOWN_crash);
/* we're never actually going to get here... */
}
static int
xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
{
unw_init_running(xen_panic_hypercall, NULL);
/* we're never actually going to get here... */
return NOTIFY_DONE;
}
static struct notifier_block xen_panic_block = {
xen_panic_event, NULL, 0 /* try to go last */
};
static void xen_pm_power_off(void)
{
local_irq_disable();
HYPERVISOR_shutdown(SHUTDOWN_poweroff);
}
static void __init
xen_banner(void)
{
printk(KERN_INFO
"Running on Xen! pl = %d start_info_pfn=0x%lx nr_pages=%ld "
"flags=0x%x\n",
xen_info.kernel_rpl,
HYPERVISOR_shared_info->arch.start_info_pfn,
xen_start_info->nr_pages, xen_start_info->flags);
}
static int __init
xen_reserve_memory(struct rsvd_region *region)
{
region->start = (unsigned long)__va(
(HYPERVISOR_shared_info->arch.start_info_pfn << PAGE_SHIFT));
region->end = region->start + PAGE_SIZE;
return 1;
}
static void __init
xen_arch_setup_early(void)
{
struct shared_info *s;
BUG_ON(!xen_pv_domain());
s = HYPERVISOR_shared_info;
xen_start_info = __va(s->arch.start_info_pfn << PAGE_SHIFT);
/* Must be done before any hypercall. */
xencomm_initialize();
xen_setup_features();
/* Register a call for panic conditions. */
atomic_notifier_chain_register(&panic_notifier_list,
&xen_panic_block);
pm_power_off = xen_pm_power_off;
xen_ia64_enable_opt_feature();
}
static void __init
xen_arch_setup_console(char **cmdline_p)
{
add_preferred_console("xenboot", 0, NULL);
add_preferred_console("tty", 0, NULL);
/* use hvc_xen */
add_preferred_console("hvc", 0, NULL);
#if !defined(CONFIG_VT) || !defined(CONFIG_DUMMY_CONSOLE)
conswitchp = NULL;
#endif
}
static int __init
xen_arch_setup_nomca(void)
{
return 1;
}
static void __init
xen_post_smp_prepare_boot_cpu(void)
{
xen_setup_vcpu_info_placement();
}
#ifdef ASM_SUPPORTED
static unsigned long __init_or_module
xen_patch_bundle(void *sbundle, void *ebundle, unsigned long type);
#endif
static void __init
xen_patch_branch(unsigned long tag, unsigned long type);
static const struct pv_init_ops xen_init_ops __initconst = {
.banner = xen_banner,
.reserve_memory = xen_reserve_memory,
.arch_setup_early = xen_arch_setup_early,
.arch_setup_console = xen_arch_setup_console,
.arch_setup_nomca = xen_arch_setup_nomca,
.post_smp_prepare_boot_cpu = xen_post_smp_prepare_boot_cpu,
#ifdef ASM_SUPPORTED
.patch_bundle = xen_patch_bundle,
#endif
.patch_branch = xen_patch_branch,
};
/***************************************************************************
* pv_fsys_data
* addresses for fsys
*/
extern unsigned long xen_fsyscall_table[NR_syscalls];
extern char xen_fsys_bubble_down[];
struct pv_fsys_data xen_fsys_data __initdata = {
.fsyscall_table = (unsigned long *)xen_fsyscall_table,
.fsys_bubble_down = (void *)xen_fsys_bubble_down,
};
/***************************************************************************
* pv_patchdata
* patchdata addresses
*/
#define DECLARE(name) \
extern unsigned long __xen_start_gate_##name##_patchlist[]; \
extern unsigned long __xen_end_gate_##name##_patchlist[]
DECLARE(fsyscall);
DECLARE(brl_fsys_bubble_down);
DECLARE(vtop);
DECLARE(mckinley_e9);
extern unsigned long __xen_start_gate_section[];
#define ASSIGN(name) \
.start_##name##_patchlist = \
(unsigned long)__xen_start_gate_##name##_patchlist, \
.end_##name##_patchlist = \
(unsigned long)__xen_end_gate_##name##_patchlist
static struct pv_patchdata xen_patchdata __initdata = {
ASSIGN(fsyscall),
ASSIGN(brl_fsys_bubble_down),
ASSIGN(vtop),
ASSIGN(mckinley_e9),
.gate_section = (void*)__xen_start_gate_section,
};
/***************************************************************************
* pv_cpu_ops
* intrinsics hooks.
*/
#ifndef ASM_SUPPORTED
static void
xen_set_itm_with_offset(unsigned long val)
{
/* ia64_cpu_local_tick() calls this with interrupt enabled. */
/* WARN_ON(!irqs_disabled()); */
xen_set_itm(val - XEN_MAPPEDREGS->itc_offset);
}
static unsigned long
xen_get_itm_with_offset(void)
{
/* unused at this moment */
printk(KERN_DEBUG "%s is called.\n", __func__);
WARN_ON(!irqs_disabled());
return ia64_native_getreg(_IA64_REG_CR_ITM) +
XEN_MAPPEDREGS->itc_offset;
}
/* ia64_set_itc() is only called by
* cpu_init() with ia64_set_itc(0) and ia64_sync_itc().
* So XEN_MAPPEDRESG->itc_offset cal be considered as almost constant.
*/
static void
xen_set_itc(unsigned long val)
{
unsigned long mitc;
WARN_ON(!irqs_disabled());
mitc = ia64_native_getreg(_IA64_REG_AR_ITC);
XEN_MAPPEDREGS->itc_offset = val - mitc;
XEN_MAPPEDREGS->itc_last = val;
}
static unsigned long
xen_get_itc(void)
{
unsigned long res;
unsigned long itc_offset;
unsigned long itc_last;
unsigned long ret_itc_last;
itc_offset = XEN_MAPPEDREGS->itc_offset;
do {
itc_last = XEN_MAPPEDREGS->itc_last;
res = ia64_native_getreg(_IA64_REG_AR_ITC);
res += itc_offset;
if (itc_last >= res)
res = itc_last + 1;
ret_itc_last = cmpxchg(&XEN_MAPPEDREGS->itc_last,
itc_last, res);
} while (unlikely(ret_itc_last != itc_last));
return res;
#if 0
/* ia64_itc_udelay() calls ia64_get_itc() with interrupt enabled.
Should it be paravirtualized instead? */
WARN_ON(!irqs_disabled());
itc_offset = XEN_MAPPEDREGS->itc_offset;
itc_last = XEN_MAPPEDREGS->itc_last;
res = ia64_native_getreg(_IA64_REG_AR_ITC);
res += itc_offset;
if (itc_last >= res)
res = itc_last + 1;
XEN_MAPPEDREGS->itc_last = res;
return res;
#endif
}
static void xen_setreg(int regnum, unsigned long val)
{
switch (regnum) {
case _IA64_REG_AR_KR0 ... _IA64_REG_AR_KR7:
xen_set_kr(regnum - _IA64_REG_AR_KR0, val);
break;
case _IA64_REG_AR_ITC:
xen_set_itc(val);
break;
case _IA64_REG_CR_TPR:
xen_set_tpr(val);
break;
case _IA64_REG_CR_ITM:
xen_set_itm_with_offset(val);
break;
case _IA64_REG_CR_EOI:
xen_eoi(val);
break;
default:
ia64_native_setreg_func(regnum, val);
break;
}
}
static unsigned long xen_getreg(int regnum)
{
unsigned long res;
switch (regnum) {
case _IA64_REG_PSR:
res = xen_get_psr();
break;
case _IA64_REG_AR_ITC:
res = xen_get_itc();
break;
case _IA64_REG_CR_ITM:
res = xen_get_itm_with_offset();
break;
case _IA64_REG_CR_IVR:
res = xen_get_ivr();
break;
case _IA64_REG_CR_TPR:
res = xen_get_tpr();
break;
default:
res = ia64_native_getreg_func(regnum);
break;
}
return res;
}
/* turning on interrupts is a bit more complicated.. write to the
* memory-mapped virtual psr.i bit first (to avoid race condition),
* then if any interrupts were pending, we have to execute a hyperprivop
* to ensure the pending interrupt gets delivered; else we're done! */
static void
xen_ssm_i(void)
{
int old = xen_get_virtual_psr_i();
xen_set_virtual_psr_i(1);
barrier();
if (!old && xen_get_virtual_pend())
xen_hyper_ssm_i();
}
/* turning off interrupts can be paravirtualized simply by writing
* to a memory-mapped virtual psr.i bit (implemented as a 16-bit bool) */
static void
xen_rsm_i(void)
{
xen_set_virtual_psr_i(0);
barrier();
}
static unsigned long
xen_get_psr_i(void)
{
return xen_get_virtual_psr_i() ? IA64_PSR_I : 0;
}
static void
xen_intrin_local_irq_restore(unsigned long mask)
{
if (mask & IA64_PSR_I)
xen_ssm_i();
else
xen_rsm_i();
}
#else
#define __DEFINE_FUNC(name, code) \
extern const char xen_ ## name ## _direct_start[]; \
extern const char xen_ ## name ## _direct_end[]; \
asm (".align 32\n" \
".proc xen_" #name "\n" \
"xen_" #name ":\n" \
"xen_" #name "_direct_start:\n" \
code \
"xen_" #name "_direct_end:\n" \
"br.cond.sptk.many b6\n" \
".endp xen_" #name "\n")
#define DEFINE_VOID_FUNC0(name, code) \
extern void \
xen_ ## name (void); \
__DEFINE_FUNC(name, code)
#define DEFINE_VOID_FUNC1(name, code) \
extern void \
xen_ ## name (unsigned long arg); \
__DEFINE_FUNC(name, code)
#define DEFINE_VOID_FUNC1_VOID(name, code) \
extern void \
xen_ ## name (void *arg); \
__DEFINE_FUNC(name, code)
#define DEFINE_VOID_FUNC2(name, code) \
extern void \
xen_ ## name (unsigned long arg0, \
unsigned long arg1); \
__DEFINE_FUNC(name, code)
#define DEFINE_FUNC0(name, code) \
extern unsigned long \
xen_ ## name (void); \
__DEFINE_FUNC(name, code)
#define DEFINE_FUNC1(name, type, code) \
extern unsigned long \
xen_ ## name (type arg); \
__DEFINE_FUNC(name, code)
#define XEN_PSR_I_ADDR_ADDR (XSI_BASE + XSI_PSR_I_ADDR_OFS)
/*
* static void xen_set_itm_with_offset(unsigned long val)
* xen_set_itm(val - XEN_MAPPEDREGS->itc_offset);
*/
/* 2 bundles */
DEFINE_VOID_FUNC1(set_itm_with_offset,
"mov r2 = " __stringify(XSI_BASE) " + "
__stringify(XSI_ITC_OFFSET_OFS) "\n"
";;\n"
"ld8 r3 = [r2]\n"
";;\n"
"sub r8 = r8, r3\n"
"break " __stringify(HYPERPRIVOP_SET_ITM) "\n");
/*
* static unsigned long xen_get_itm_with_offset(void)
* return ia64_native_getreg(_IA64_REG_CR_ITM) + XEN_MAPPEDREGS->itc_offset;
*/
/* 2 bundles */
DEFINE_FUNC0(get_itm_with_offset,
"mov r2 = " __stringify(XSI_BASE) " + "
__stringify(XSI_ITC_OFFSET_OFS) "\n"
";;\n"
"ld8 r3 = [r2]\n"
"mov r8 = cr.itm\n"
";;\n"
"add r8 = r8, r2\n");
/*
* static void xen_set_itc(unsigned long val)
* unsigned long mitc;
*
* WARN_ON(!irqs_disabled());
* mitc = ia64_native_getreg(_IA64_REG_AR_ITC);
* XEN_MAPPEDREGS->itc_offset = val - mitc;
* XEN_MAPPEDREGS->itc_last = val;
*/
/* 2 bundles */
DEFINE_VOID_FUNC1(set_itc,
"mov r2 = " __stringify(XSI_BASE) " + "
__stringify(XSI_ITC_LAST_OFS) "\n"
"mov r3 = ar.itc\n"
";;\n"
"sub r3 = r8, r3\n"
"st8 [r2] = r8, "
__stringify(XSI_ITC_LAST_OFS) " - "
__stringify(XSI_ITC_OFFSET_OFS) "\n"
";;\n"
"st8 [r2] = r3\n");
/*
* static unsigned long xen_get_itc(void)
* unsigned long res;
* unsigned long itc_offset;
* unsigned long itc_last;
* unsigned long ret_itc_last;
*
* itc_offset = XEN_MAPPEDREGS->itc_offset;
* do {
* itc_last = XEN_MAPPEDREGS->itc_last;
* res = ia64_native_getreg(_IA64_REG_AR_ITC);
* res += itc_offset;
* if (itc_last >= res)
* res = itc_last + 1;
* ret_itc_last = cmpxchg(&XEN_MAPPEDREGS->itc_last,
* itc_last, res);
* } while (unlikely(ret_itc_last != itc_last));
* return res;
*/
/* 5 bundles */
DEFINE_FUNC0(get_itc,
"mov r2 = " __stringify(XSI_BASE) " + "
__stringify(XSI_ITC_OFFSET_OFS) "\n"
";;\n"
"ld8 r9 = [r2], " __stringify(XSI_ITC_LAST_OFS) " - "
__stringify(XSI_ITC_OFFSET_OFS) "\n"
/* r9 = itc_offset */
/* r2 = XSI_ITC_OFFSET */
"888:\n"
"mov r8 = ar.itc\n" /* res = ar.itc */
";;\n"
"ld8 r3 = [r2]\n" /* r3 = itc_last */
"add r8 = r8, r9\n" /* res = ar.itc + itc_offset */
";;\n"
"cmp.gtu p6, p0 = r3, r8\n"
";;\n"
"(p6) add r8 = 1, r3\n" /* if (itc_last > res) itc_last + 1 */
";;\n"
"mov ar.ccv = r8\n"
";;\n"
"cmpxchg8.acq r10 = [r2], r8, ar.ccv\n"
";;\n"
"cmp.ne p6, p0 = r10, r3\n"
"(p6) hint @pause\n"
"(p6) br.cond.spnt 888b\n");
DEFINE_VOID_FUNC1_VOID(fc,
"break " __stringify(HYPERPRIVOP_FC) "\n");
/*
* psr_i_addr_addr = XEN_PSR_I_ADDR_ADDR
* masked_addr = *psr_i_addr_addr
* pending_intr_addr = masked_addr - 1
* if (val & IA64_PSR_I) {
* masked = *masked_addr
* *masked_addr = 0:xen_set_virtual_psr_i(1)
* compiler barrier
* if (masked) {
* uint8_t pending = *pending_intr_addr;
* if (pending)
* XEN_HYPER_SSM_I
* }
* } else {
* *masked_addr = 1:xen_set_virtual_psr_i(0)
* }
*/
/* 6 bundles */
DEFINE_VOID_FUNC1(intrin_local_irq_restore,
/* r8 = input value: 0 or IA64_PSR_I
* p6 = (flags & IA64_PSR_I)
* = if clause
* p7 = !(flags & IA64_PSR_I)
* = else clause
*/
"cmp.ne p6, p7 = r8, r0\n"
"mov r9 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
";;\n"
/* r9 = XEN_PSR_I_ADDR */
"ld8 r9 = [r9]\n"
";;\n"
/* r10 = masked previous value */
"(p6) ld1.acq r10 = [r9]\n"
";;\n"
/* p8 = !masked interrupt masked previously? */
"(p6) cmp.ne.unc p8, p0 = r10, r0\n"
/* p7 = else clause */
"(p7) mov r11 = 1\n"
";;\n"
/* masked = 1 */
"(p7) st1.rel [r9] = r11\n"
/* p6 = if clause */
/* masked = 0
* r9 = masked_addr - 1
* = pending_intr_addr
*/
"(p8) st1.rel [r9] = r0, -1\n"
";;\n"
/* r8 = pending_intr */
"(p8) ld1.acq r11 = [r9]\n"
";;\n"
/* p9 = interrupt pending? */
"(p8) cmp.ne.unc p9, p10 = r11, r0\n"
";;\n"
"(p10) mf\n"
/* issue hypercall to trigger interrupt */
"(p9) break " __stringify(HYPERPRIVOP_SSM_I) "\n");
DEFINE_VOID_FUNC2(ptcga,
"break " __stringify(HYPERPRIVOP_PTC_GA) "\n");
DEFINE_VOID_FUNC2(set_rr,
"break " __stringify(HYPERPRIVOP_SET_RR) "\n");
/*
* tmp = XEN_MAPPEDREGS->interrupt_mask_addr = XEN_PSR_I_ADDR_ADDR;
* tmp = *tmp
* tmp = *tmp;
* psr_i = tmp? 0: IA64_PSR_I;
*/
/* 4 bundles */
DEFINE_FUNC0(get_psr_i,
"mov r9 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
";;\n"
"ld8 r9 = [r9]\n" /* r9 = XEN_PSR_I_ADDR */
"mov r8 = 0\n" /* psr_i = 0 */
";;\n"
"ld1.acq r9 = [r9]\n" /* r9 = XEN_PSR_I */
";;\n"
"cmp.eq.unc p6, p0 = r9, r0\n" /* p6 = (XEN_PSR_I != 0) */
";;\n"
"(p6) mov r8 = " __stringify(1 << IA64_PSR_I_BIT) "\n");
DEFINE_FUNC1(thash, unsigned long,
"break " __stringify(HYPERPRIVOP_THASH) "\n");
DEFINE_FUNC1(get_cpuid, int,
"break " __stringify(HYPERPRIVOP_GET_CPUID) "\n");
DEFINE_FUNC1(get_pmd, int,
"break " __stringify(HYPERPRIVOP_GET_PMD) "\n");
DEFINE_FUNC1(get_rr, unsigned long,
"break " __stringify(HYPERPRIVOP_GET_RR) "\n");
/*
* void xen_privop_ssm_i(void)
*
* int masked = !xen_get_virtual_psr_i();
* // masked = *(*XEN_MAPPEDREGS->interrupt_mask_addr)
* xen_set_virtual_psr_i(1)
* // *(*XEN_MAPPEDREGS->interrupt_mask_addr) = 0
* // compiler barrier
* if (masked) {
* uint8_t* pend_int_addr =
* (uint8_t*)(*XEN_MAPPEDREGS->interrupt_mask_addr) - 1;
* uint8_t pending = *pend_int_addr;
* if (pending)
* XEN_HYPER_SSM_I
* }
*/
/* 4 bundles */
DEFINE_VOID_FUNC0(ssm_i,
"mov r8 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
";;\n"
"ld8 r8 = [r8]\n" /* r8 = XEN_PSR_I_ADDR */
";;\n"
"ld1.acq r9 = [r8]\n" /* r9 = XEN_PSR_I */
";;\n"
"st1.rel [r8] = r0, -1\n" /* psr_i = 0. enable interrupt
* r8 = XEN_PSR_I_ADDR - 1
* = pend_int_addr
*/
"cmp.eq.unc p0, p6 = r9, r0\n"/* p6 = !XEN_PSR_I
* previously interrupt
* masked?
*/
";;\n"
"(p6) ld1.acq r8 = [r8]\n" /* r8 = xen_pend_int */
";;\n"
"(p6) cmp.eq.unc p6, p7 = r8, r0\n" /*interrupt pending?*/
";;\n"
/* issue hypercall to get interrupt */
"(p7) break " __stringify(HYPERPRIVOP_SSM_I) "\n"
";;\n");
/*
* psr_i_addr_addr = XEN_MAPPEDREGS->interrupt_mask_addr
* = XEN_PSR_I_ADDR_ADDR;
* psr_i_addr = *psr_i_addr_addr;
* *psr_i_addr = 1;
*/
/* 2 bundles */
DEFINE_VOID_FUNC0(rsm_i,
"mov r8 = " __stringify(XEN_PSR_I_ADDR_ADDR) "\n"
/* r8 = XEN_PSR_I_ADDR */
"mov r9 = 1\n"
";;\n"
"ld8 r8 = [r8]\n" /* r8 = XEN_PSR_I */
";;\n"
"st1.rel [r8] = r9\n"); /* XEN_PSR_I = 1 */
extern void
xen_set_rr0_to_rr4(unsigned long val0, unsigned long val1,
unsigned long val2, unsigned long val3,
unsigned long val4);
__DEFINE_FUNC(set_rr0_to_rr4,
"break " __stringify(HYPERPRIVOP_SET_RR0_TO_RR4) "\n");
extern unsigned long xen_getreg(int regnum);
#define __DEFINE_GET_REG(id, privop) \
"mov r2 = " __stringify(_IA64_REG_ ## id) "\n" \
";;\n" \
"cmp.eq p6, p0 = r2, r8\n" \
";;\n" \
"(p6) break " __stringify(HYPERPRIVOP_GET_ ## privop) "\n" \
"(p6) br.cond.sptk.many b6\n" \
";;\n"
__DEFINE_FUNC(getreg,
__DEFINE_GET_REG(PSR, PSR)
/* get_itc */
"mov r2 = " __stringify(_IA64_REG_AR_ITC) "\n"
";;\n"
"cmp.eq p6, p0 = r2, r8\n"
";;\n"
"(p6) br.cond.spnt xen_get_itc\n"
";;\n"
/* get itm */
"mov r2 = " __stringify(_IA64_REG_CR_ITM) "\n"
";;\n"
"cmp.eq p6, p0 = r2, r8\n"
";;\n"
"(p6) br.cond.spnt xen_get_itm_with_offset\n"
";;\n"
__DEFINE_GET_REG(CR_IVR, IVR)
__DEFINE_GET_REG(CR_TPR, TPR)
/* fall back */
"movl r2 = ia64_native_getreg_func\n"
";;\n"
"mov b7 = r2\n"
";;\n"
"br.cond.sptk.many b7\n");
extern void xen_setreg(int regnum, unsigned long val);
#define __DEFINE_SET_REG(id, privop) \
"mov r2 = " __stringify(_IA64_REG_ ## id) "\n" \
";;\n" \
"cmp.eq p6, p0 = r2, r9\n" \
";;\n" \
"(p6) break " __stringify(HYPERPRIVOP_ ## privop) "\n" \
"(p6) br.cond.sptk.many b6\n" \
";;\n"
__DEFINE_FUNC(setreg,
/* kr0 .. kr 7*/
/*
* if (_IA64_REG_AR_KR0 <= regnum &&
* regnum <= _IA64_REG_AR_KR7) {
* register __index asm ("r8") = regnum - _IA64_REG_AR_KR0
* register __val asm ("r9") = val
* "break HYPERPRIVOP_SET_KR"
* }
*/
"mov r17 = r9\n"
"mov r2 = " __stringify(_IA64_REG_AR_KR0) "\n"
";;\n"
"cmp.ge p6, p0 = r9, r2\n"
"sub r17 = r17, r2\n"
";;\n"
"(p6) cmp.ge.unc p7, p0 = "
__stringify(_IA64_REG_AR_KR7) " - " __stringify(_IA64_REG_AR_KR0)
", r17\n"
";;\n"
"(p7) mov r9 = r8\n"
";;\n"
"(p7) mov r8 = r17\n"
"(p7) break " __stringify(HYPERPRIVOP_SET_KR) "\n"
/* set itm */
"mov r2 = " __stringify(_IA64_REG_CR_ITM) "\n"
";;\n"
"cmp.eq p6, p0 = r2, r8\n"
";;\n"
"(p6) br.cond.spnt xen_set_itm_with_offset\n"
/* set itc */
"mov r2 = " __stringify(_IA64_REG_AR_ITC) "\n"
";;\n"
"cmp.eq p6, p0 = r2, r8\n"
";;\n"
"(p6) br.cond.spnt xen_set_itc\n"
__DEFINE_SET_REG(CR_TPR, SET_TPR)
__DEFINE_SET_REG(CR_EOI, EOI)
/* fall back */
"movl r2 = ia64_native_setreg_func\n"
";;\n"
"mov b7 = r2\n"
";;\n"
"br.cond.sptk.many b7\n");
#endif
static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.fc = xen_fc,
.thash = xen_thash,
.get_cpuid = xen_get_cpuid,
.get_pmd = xen_get_pmd,
.getreg = xen_getreg,
.setreg = xen_setreg,
.ptcga = xen_ptcga,
.get_rr = xen_get_rr,
.set_rr = xen_set_rr,
.set_rr0_to_rr4 = xen_set_rr0_to_rr4,
.ssm_i = xen_ssm_i,
.rsm_i = xen_rsm_i,
.get_psr_i = xen_get_psr_i,
.intrin_local_irq_restore
= xen_intrin_local_irq_restore,
};
/******************************************************************************
* replacement of hand written assembly codes.
*/
extern char xen_switch_to;
extern char xen_leave_syscall;
extern char xen_work_processed_syscall;
extern char xen_leave_kernel;
const struct pv_cpu_asm_switch xen_cpu_asm_switch = {
.switch_to = (unsigned long)&xen_switch_to,
.leave_syscall = (unsigned long)&xen_leave_syscall,
.work_processed_syscall = (unsigned long)&xen_work_processed_syscall,
.leave_kernel = (unsigned long)&xen_leave_kernel,
};
/***************************************************************************
* pv_iosapic_ops
* iosapic read/write hooks.
*/
static void
xen_pcat_compat_init(void)
{
/* nothing */
}
static struct irq_chip*
xen_iosapic_get_irq_chip(unsigned long trigger)
{
return NULL;
}
static unsigned int
xen_iosapic_read(char __iomem *iosapic, unsigned int reg)
{
struct physdev_apic apic_op;
int ret;
apic_op.apic_physbase = (unsigned long)iosapic -
__IA64_UNCACHED_OFFSET;
apic_op.reg = reg;
ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
if (ret)
return ret;
return apic_op.value;
}
static void
xen_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
{
struct physdev_apic apic_op;
apic_op.apic_physbase = (unsigned long)iosapic -
__IA64_UNCACHED_OFFSET;
apic_op.reg = reg;
apic_op.value = val;
HYPERVISOR_physdev_op(PHYSDEVOP_apic_write, &apic_op);
}
static struct pv_iosapic_ops xen_iosapic_ops __initdata = {
.pcat_compat_init = xen_pcat_compat_init,
.__get_irq_chip = xen_iosapic_get_irq_chip,
.__read = xen_iosapic_read,
.__write = xen_iosapic_write,
};
/***************************************************************************
* pv_ops initialization
*/
void __init
xen_setup_pv_ops(void)
{
xen_info_init();
pv_info = xen_info;
pv_init_ops = xen_init_ops;
pv_fsys_data = xen_fsys_data;
pv_patchdata = xen_patchdata;
pv_cpu_ops = xen_cpu_ops;
pv_iosapic_ops = xen_iosapic_ops;
pv_irq_ops = xen_irq_ops;
pv_time_ops = xen_time_ops;
paravirt_cpu_asm_init(&xen_cpu_asm_switch);
}
#ifdef ASM_SUPPORTED
/***************************************************************************
* binary pacthing
* pv_init_ops.patch_bundle
*/
#define DEFINE_FUNC_GETREG(name, privop) \
DEFINE_FUNC0(get_ ## name, \
"break "__stringify(HYPERPRIVOP_GET_ ## privop) "\n")
DEFINE_FUNC_GETREG(psr, PSR);
DEFINE_FUNC_GETREG(eflag, EFLAG);
DEFINE_FUNC_GETREG(ivr, IVR);
DEFINE_FUNC_GETREG(tpr, TPR);
#define DEFINE_FUNC_SET_KR(n) \
DEFINE_VOID_FUNC0(set_kr ## n, \
";;\n" \
"mov r9 = r8\n" \
"mov r8 = " #n "\n" \
"break " __stringify(HYPERPRIVOP_SET_KR) "\n")
DEFINE_FUNC_SET_KR(0);
DEFINE_FUNC_SET_KR(1);
DEFINE_FUNC_SET_KR(2);
DEFINE_FUNC_SET_KR(3);
DEFINE_FUNC_SET_KR(4);
DEFINE_FUNC_SET_KR(5);
DEFINE_FUNC_SET_KR(6);
DEFINE_FUNC_SET_KR(7);
#define __DEFINE_FUNC_SETREG(name, privop) \
DEFINE_VOID_FUNC0(name, \
"break "__stringify(HYPERPRIVOP_ ## privop) "\n")
#define DEFINE_FUNC_SETREG(name, privop) \
__DEFINE_FUNC_SETREG(set_ ## name, SET_ ## privop)
DEFINE_FUNC_SETREG(eflag, EFLAG);
DEFINE_FUNC_SETREG(tpr, TPR);
__DEFINE_FUNC_SETREG(eoi, EOI);
extern const char xen_check_events[];
extern const char __xen_intrin_local_irq_restore_direct_start[];
extern const char __xen_intrin_local_irq_restore_direct_end[];
extern const unsigned long __xen_intrin_local_irq_restore_direct_reloc;
asm (
".align 32\n"
".proc xen_check_events\n"
"xen_check_events:\n"
/* masked = 0
* r9 = masked_addr - 1
* = pending_intr_addr
*/
"st1.rel [r9] = r0, -1\n"
";;\n"
/* r8 = pending_intr */
"ld1.acq r11 = [r9]\n"
";;\n"
/* p9 = interrupt pending? */
"cmp.ne p9, p10 = r11, r0\n"
";;\n"
"(p10) mf\n"
/* issue hypercall to trigger interrupt */
"(p9) break " __stringify(HYPERPRIVOP_SSM_I) "\n"
"br.cond.sptk.many b6\n"
".endp xen_check_events\n"
"\n"
".align 32\n"
".proc __xen_intrin_local_irq_restore_direct\n"
"__xen_intrin_local_irq_restore_direct:\n"
"__xen_intrin_local_irq_restore_direct_start:\n"
"1:\n"
"{\n"
"cmp.ne p6, p7 = r8, r0\n"
"mov r17 = ip\n" /* get ip to calc return address */
"mov r9 = "__stringify(XEN_PSR_I_ADDR_ADDR) "\n"
";;\n"
"}\n"
"{\n"
/* r9 = XEN_PSR_I_ADDR */
"ld8 r9 = [r9]\n"
";;\n"
/* r10 = masked previous value */
"(p6) ld1.acq r10 = [r9]\n"
"adds r17 = 1f - 1b, r17\n" /* calculate return address */
";;\n"
"}\n"
"{\n"
/* p8 = !masked interrupt masked previously? */
"(p6) cmp.ne.unc p8, p0 = r10, r0\n"
"\n"
/* p7 = else clause */
"(p7) mov r11 = 1\n"
";;\n"
"(p8) mov b6 = r17\n" /* set return address */
"}\n"
"{\n"
/* masked = 1 */
"(p7) st1.rel [r9] = r11\n"
"\n"
"[99:]\n"
"(p8) brl.cond.dptk.few xen_check_events\n"
"}\n"
/* pv calling stub is 5 bundles. fill nop to adjust return address */
"{\n"
"nop 0\n"
"nop 0\n"
"nop 0\n"
"}\n"
"1:\n"
"__xen_intrin_local_irq_restore_direct_end:\n"
".endp __xen_intrin_local_irq_restore_direct\n"
"\n"
".align 8\n"
"__xen_intrin_local_irq_restore_direct_reloc:\n"
"data8 99b\n"
);
static struct paravirt_patch_bundle_elem xen_patch_bundle_elems[]
__initdata_or_module =
{
#define XEN_PATCH_BUNDLE_ELEM(name, type) \
{ \
(void*)xen_ ## name ## _direct_start, \
(void*)xen_ ## name ## _direct_end, \
PARAVIRT_PATCH_TYPE_ ## type, \
}
XEN_PATCH_BUNDLE_ELEM(fc, FC),
XEN_PATCH_BUNDLE_ELEM(thash, THASH),
XEN_PATCH_BUNDLE_ELEM(get_cpuid, GET_CPUID),
XEN_PATCH_BUNDLE_ELEM(get_pmd, GET_PMD),
XEN_PATCH_BUNDLE_ELEM(ptcga, PTCGA),
XEN_PATCH_BUNDLE_ELEM(get_rr, GET_RR),
XEN_PATCH_BUNDLE_ELEM(set_rr, SET_RR),
XEN_PATCH_BUNDLE_ELEM(set_rr0_to_rr4, SET_RR0_TO_RR4),
XEN_PATCH_BUNDLE_ELEM(ssm_i, SSM_I),
XEN_PATCH_BUNDLE_ELEM(rsm_i, RSM_I),
XEN_PATCH_BUNDLE_ELEM(get_psr_i, GET_PSR_I),
{
(void*)__xen_intrin_local_irq_restore_direct_start,
(void*)__xen_intrin_local_irq_restore_direct_end,
PARAVIRT_PATCH_TYPE_INTRIN_LOCAL_IRQ_RESTORE,
},
#define XEN_PATCH_BUNDLE_ELEM_GETREG(name, reg) \
{ \
xen_get_ ## name ## _direct_start, \
xen_get_ ## name ## _direct_end, \
PARAVIRT_PATCH_TYPE_GETREG + _IA64_REG_ ## reg, \
}
XEN_PATCH_BUNDLE_ELEM_GETREG(psr, PSR),
XEN_PATCH_BUNDLE_ELEM_GETREG(eflag, AR_EFLAG),
XEN_PATCH_BUNDLE_ELEM_GETREG(ivr, CR_IVR),
XEN_PATCH_BUNDLE_ELEM_GETREG(tpr, CR_TPR),
XEN_PATCH_BUNDLE_ELEM_GETREG(itc, AR_ITC),
XEN_PATCH_BUNDLE_ELEM_GETREG(itm_with_offset, CR_ITM),
#define __XEN_PATCH_BUNDLE_ELEM_SETREG(name, reg) \
{ \
xen_ ## name ## _direct_start, \
xen_ ## name ## _direct_end, \
PARAVIRT_PATCH_TYPE_SETREG + _IA64_REG_ ## reg, \
}
#define XEN_PATCH_BUNDLE_ELEM_SETREG(name, reg) \
__XEN_PATCH_BUNDLE_ELEM_SETREG(set_ ## name, reg)
XEN_PATCH_BUNDLE_ELEM_SETREG(kr0, AR_KR0),
XEN_PATCH_BUNDLE_ELEM_SETREG(kr1, AR_KR1),
XEN_PATCH_BUNDLE_ELEM_SETREG(kr2, AR_KR2),
XEN_PATCH_BUNDLE_ELEM_SETREG(kr3, AR_KR3),
XEN_PATCH_BUNDLE_ELEM_SETREG(kr4, AR_KR4),
XEN_PATCH_BUNDLE_ELEM_SETREG(kr5, AR_KR5),
XEN_PATCH_BUNDLE_ELEM_SETREG(kr6, AR_KR6),
XEN_PATCH_BUNDLE_ELEM_SETREG(kr7, AR_KR7),
XEN_PATCH_BUNDLE_ELEM_SETREG(eflag, AR_EFLAG),
XEN_PATCH_BUNDLE_ELEM_SETREG(tpr, CR_TPR),
__XEN_PATCH_BUNDLE_ELEM_SETREG(eoi, CR_EOI),
XEN_PATCH_BUNDLE_ELEM_SETREG(itc, AR_ITC),
XEN_PATCH_BUNDLE_ELEM_SETREG(itm_with_offset, CR_ITM),
};
static unsigned long __init_or_module
xen_patch_bundle(void *sbundle, void *ebundle, unsigned long type)
{
const unsigned long nelems = sizeof(xen_patch_bundle_elems) /
sizeof(xen_patch_bundle_elems[0]);
unsigned long used;
const struct paravirt_patch_bundle_elem *found;
used = __paravirt_patch_apply_bundle(sbundle, ebundle, type,
xen_patch_bundle_elems, nelems,
&found);
if (found == NULL)
/* fallback */
return ia64_native_patch_bundle(sbundle, ebundle, type);
if (used == 0)
return used;
/* relocation */
switch (type) {
case PARAVIRT_PATCH_TYPE_INTRIN_LOCAL_IRQ_RESTORE: {
unsigned long reloc =
__xen_intrin_local_irq_restore_direct_reloc;
unsigned long reloc_offset = reloc - (unsigned long)
__xen_intrin_local_irq_restore_direct_start;
unsigned long tag = (unsigned long)sbundle + reloc_offset;
paravirt_patch_reloc_brl(tag, xen_check_events);
break;
}
default:
/* nothing */
break;
}
return used;
}
#endif /* ASM_SUPPOTED */
const struct paravirt_patch_branch_target xen_branch_target[]
__initconst = {
#define PARAVIRT_BR_TARGET(name, type) \
{ \
&xen_ ## name, \
PARAVIRT_PATCH_TYPE_BR_ ## type, \
}
PARAVIRT_BR_TARGET(switch_to, SWITCH_TO),
PARAVIRT_BR_TARGET(leave_syscall, LEAVE_SYSCALL),
PARAVIRT_BR_TARGET(work_processed_syscall, WORK_PROCESSED_SYSCALL),
PARAVIRT_BR_TARGET(leave_kernel, LEAVE_KERNEL),
};
static void __init
xen_patch_branch(unsigned long tag, unsigned long type)
{
const unsigned long nelem =
sizeof(xen_branch_target) / sizeof(xen_branch_target[0]);
__paravirt_patch_apply_branch(tag, type, xen_branch_target, nelem);
}
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