diff options
| -rw-r--r-- | arch/ia64/xen/xen_pv_ops.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/arch/ia64/xen/xen_pv_ops.c b/arch/ia64/xen/xen_pv_ops.c index fc9d599b62a..c236f04ffad 100644 --- a/arch/ia64/xen/xen_pv_ops.c +++ b/arch/ia64/xen/xen_pv_ops.c @@ -163,6 +163,119 @@ static const struct pv_init_ops xen_init_ops __initdata = { }; /*************************************************************************** + * pv_cpu_ops + * intrinsics hooks. + */ + +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; +#ifdef CONFIG_IA32_SUPPORT + case _IA64_REG_AR_EFLAG: + xen_set_eflag(val); + break; +#endif + case _IA64_REG_CR_TPR: + xen_set_tpr(val); + break; + case _IA64_REG_CR_ITM: + xen_set_itm(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; +#ifdef CONFIG_IA32_SUPPORT + case _IA64_REG_AR_EFLAG: + res = xen_get_eflag(); + break; +#endif + 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(); +} + +static const struct pv_cpu_ops xen_cpu_ops __initdata = { + .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, +}; + +/*************************************************************************** * pv_ops initialization */ @@ -172,4 +285,5 @@ xen_setup_pv_ops(void) xen_info_init(); pv_info = xen_info; pv_init_ops = xen_init_ops; + pv_cpu_ops = xen_cpu_ops; } |