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/*
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* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
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*
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* PAPR Virtualized Interrupt System, aka ICS/ICP aka xics
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*
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* Copyright (c) 2010,2011 David Gibson, IBM Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*/
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#include "hw.h" |
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#include "hw/spapr.h" |
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#include "hw/xics.h" |
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/*
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* ICP: Presentation layer
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*/
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struct icp_server_state {
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uint32_t xirr; |
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uint8_t pending_priority; |
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uint8_t mfrr; |
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qemu_irq output; |
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}; |
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#define XISR_MASK 0x00ffffff |
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#define CPPR_MASK 0xff000000 |
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#define XISR(ss) (((ss)->xirr) & XISR_MASK)
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#define CPPR(ss) (((ss)->xirr) >> 24) |
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struct ics_state;
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struct icp_state {
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long nr_servers;
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struct icp_server_state *ss;
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struct ics_state *ics;
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}; |
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static void ics_reject(struct ics_state *ics, int nr); |
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static void ics_resend(struct ics_state *ics); |
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static void ics_eoi(struct ics_state *ics, int nr); |
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static void icp_check_ipi(struct icp_state *icp, int server) |
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{ |
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struct icp_server_state *ss = icp->ss + server;
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if (XISR(ss) && (ss->pending_priority <= ss->mfrr)) {
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return;
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} |
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if (XISR(ss)) {
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ics_reject(icp->ics, XISR(ss)); |
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} |
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ss->xirr = (ss->xirr & ~XISR_MASK) | XICS_IPI; |
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ss->pending_priority = ss->mfrr; |
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qemu_irq_raise(ss->output); |
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} |
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static void icp_resend(struct icp_state *icp, int server) |
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{ |
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struct icp_server_state *ss = icp->ss + server;
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if (ss->mfrr < CPPR(ss)) {
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icp_check_ipi(icp, server); |
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} |
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ics_resend(icp->ics); |
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} |
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static void icp_set_cppr(struct icp_state *icp, int server, uint8_t cppr) |
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{ |
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struct icp_server_state *ss = icp->ss + server;
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uint8_t old_cppr; |
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uint32_t old_xisr; |
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old_cppr = CPPR(ss); |
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ss->xirr = (ss->xirr & ~CPPR_MASK) | (cppr << 24);
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if (cppr < old_cppr) {
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if (XISR(ss) && (cppr <= ss->pending_priority)) {
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old_xisr = XISR(ss); |
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ss->xirr &= ~XISR_MASK; /* Clear XISR */
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qemu_irq_lower(ss->output); |
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ics_reject(icp->ics, old_xisr); |
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} |
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} else {
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if (!XISR(ss)) {
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icp_resend(icp, server); |
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} |
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} |
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} |
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static void icp_set_mfrr(struct icp_state *icp, int nr, uint8_t mfrr) |
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{ |
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struct icp_server_state *ss = icp->ss + nr;
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ss->mfrr = mfrr; |
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if (mfrr < CPPR(ss)) {
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icp_check_ipi(icp, nr); |
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} |
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} |
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static uint32_t icp_accept(struct icp_server_state *ss) |
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{ |
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uint32_t xirr; |
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qemu_irq_lower(ss->output); |
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xirr = ss->xirr; |
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ss->xirr = ss->pending_priority << 24;
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return xirr;
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} |
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static void icp_eoi(struct icp_state *icp, int server, uint32_t xirr) |
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{ |
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struct icp_server_state *ss = icp->ss + server;
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ics_eoi(icp->ics, xirr & XISR_MASK); |
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/* Send EOI -> ICS */
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ss->xirr = (ss->xirr & ~CPPR_MASK) | (xirr & CPPR_MASK); |
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if (!XISR(ss)) {
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icp_resend(icp, server); |
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} |
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} |
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static void icp_irq(struct icp_state *icp, int server, int nr, uint8_t priority) |
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{ |
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struct icp_server_state *ss = icp->ss + server;
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if ((priority >= CPPR(ss))
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|| (XISR(ss) && (ss->pending_priority <= priority))) { |
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ics_reject(icp->ics, nr); |
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} else {
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if (XISR(ss)) {
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ics_reject(icp->ics, XISR(ss)); |
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} |
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ss->xirr = (ss->xirr & ~XISR_MASK) | (nr & XISR_MASK); |
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ss->pending_priority = priority; |
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qemu_irq_raise(ss->output); |
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} |
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} |
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/*
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* ICS: Source layer
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*/
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struct ics_irq_state {
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int server;
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uint8_t priority; |
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uint8_t saved_priority; |
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/* int pending:1; */
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/* int presented:1; */
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int rejected:1; |
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int masked_pending:1; |
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}; |
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struct ics_state {
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int nr_irqs;
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int offset;
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qemu_irq *qirqs; |
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struct ics_irq_state *irqs;
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struct icp_state *icp;
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}; |
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static int ics_valid_irq(struct ics_state *ics, uint32_t nr) |
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{ |
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return (nr >= ics->offset)
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&& (nr < (ics->offset + ics->nr_irqs)); |
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} |
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static void ics_set_irq_msi(void *opaque, int srcno, int val) |
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{ |
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struct ics_state *ics = (struct ics_state *)opaque; |
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struct ics_irq_state *irq = ics->irqs + srcno;
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if (val) {
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if (irq->priority == 0xff) { |
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irq->masked_pending = 1;
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/* masked pending */ ;
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} else {
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icp_irq(ics->icp, irq->server, srcno + ics->offset, irq->priority); |
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} |
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} |
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} |
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static void ics_reject_msi(struct ics_state *ics, int nr) |
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{ |
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struct ics_irq_state *irq = ics->irqs + nr - ics->offset;
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irq->rejected = 1;
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} |
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static void ics_resend_msi(struct ics_state *ics) |
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{ |
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int i;
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for (i = 0; i < ics->nr_irqs; i++) { |
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struct ics_irq_state *irq = ics->irqs + i;
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/* FIXME: filter by server#? */
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if (irq->rejected) {
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irq->rejected = 0;
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if (irq->priority != 0xff) { |
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icp_irq(ics->icp, irq->server, i + ics->offset, irq->priority); |
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} |
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} |
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} |
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} |
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static void ics_write_xive_msi(struct ics_state *ics, int nr, int server, |
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uint8_t priority) |
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{ |
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struct ics_irq_state *irq = ics->irqs + nr - ics->offset;
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irq->server = server; |
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irq->priority = priority; |
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if (!irq->masked_pending || (priority == 0xff)) { |
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return;
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} |
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irq->masked_pending = 0;
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icp_irq(ics->icp, server, nr, priority); |
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} |
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static void ics_reject(struct ics_state *ics, int nr) |
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{ |
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ics_reject_msi(ics, nr); |
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} |
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static void ics_resend(struct ics_state *ics) |
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{ |
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ics_resend_msi(ics); |
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} |
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static void ics_eoi(struct ics_state *ics, int nr) |
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{ |
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} |
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/*
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* Exported functions
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*/
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qemu_irq xics_find_qirq(struct icp_state *icp, int irq) |
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{ |
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if ((irq < icp->ics->offset)
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|| (irq >= (icp->ics->offset + icp->ics->nr_irqs))) { |
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return NULL; |
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} |
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return icp->ics->qirqs[irq - icp->ics->offset];
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} |
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static target_ulong h_cppr(CPUState *env, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args) |
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{ |
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target_ulong cppr = args[0];
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icp_set_cppr(spapr->icp, env->cpu_index, cppr); |
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return H_SUCCESS;
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} |
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static target_ulong h_ipi(CPUState *env, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args) |
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{ |
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target_ulong server = args[0];
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target_ulong mfrr = args[1];
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if (server >= spapr->icp->nr_servers) {
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return H_PARAMETER;
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} |
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icp_set_mfrr(spapr->icp, server, mfrr); |
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return H_SUCCESS;
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} |
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static target_ulong h_xirr(CPUState *env, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args) |
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{ |
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uint32_t xirr = icp_accept(spapr->icp->ss + env->cpu_index); |
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args[0] = xirr;
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return H_SUCCESS;
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} |
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static target_ulong h_eoi(CPUState *env, sPAPREnvironment *spapr,
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target_ulong opcode, target_ulong *args) |
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{ |
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target_ulong xirr = args[0];
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icp_eoi(spapr->icp, env->cpu_index, xirr); |
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return H_SUCCESS;
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} |
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static void rtas_set_xive(sPAPREnvironment *spapr, uint32_t token, |
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uint32_t nargs, target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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struct ics_state *ics = spapr->icp->ics;
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uint32_t nr, server, priority; |
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if ((nargs != 3) || (nret != 1)) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
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nr = rtas_ld(args, 0);
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server = rtas_ld(args, 1);
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priority = rtas_ld(args, 2);
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if (!ics_valid_irq(ics, nr) || (server >= ics->icp->nr_servers)
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|| (priority > 0xff)) {
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rtas_st(rets, 0, -3); |
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return;
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} |
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ics_write_xive_msi(ics, nr, server, priority); |
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rtas_st(rets, 0, 0); /* Success */ |
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} |
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static void rtas_get_xive(sPAPREnvironment *spapr, uint32_t token, |
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uint32_t nargs, target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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struct ics_state *ics = spapr->icp->ics;
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uint32_t nr; |
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if ((nargs != 1) || (nret != 3)) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
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nr = rtas_ld(args, 0);
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if (!ics_valid_irq(ics, nr)) {
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rtas_st(rets, 0, -3); |
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return;
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} |
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rtas_st(rets, 0, 0); /* Success */ |
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rtas_st(rets, 1, ics->irqs[nr - ics->offset].server);
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rtas_st(rets, 2, ics->irqs[nr - ics->offset].priority);
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} |
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static void rtas_int_off(sPAPREnvironment *spapr, uint32_t token, |
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uint32_t nargs, target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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struct ics_state *ics = spapr->icp->ics;
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uint32_t nr; |
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if ((nargs != 1) || (nret != 1)) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
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nr = rtas_ld(args, 0);
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if (!ics_valid_irq(ics, nr)) {
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rtas_st(rets, 0, -3); |
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return;
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} |
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/* This is a NOP for now, since the described PAPR semantics don't
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* seem to gel with what Linux does */
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#if 0
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struct ics_irq_state *irq = xics->irqs + (nr - xics->offset);
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irq->saved_priority = irq->priority;
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ics_write_xive_msi(xics, nr, irq->server, 0xff);
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#endif
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rtas_st(rets, 0, 0); /* Success */ |
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} |
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static void rtas_int_on(sPAPREnvironment *spapr, uint32_t token, |
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uint32_t nargs, target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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struct ics_state *ics = spapr->icp->ics;
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uint32_t nr; |
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if ((nargs != 1) || (nret != 1)) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
406 |
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nr = rtas_ld(args, 0);
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if (!ics_valid_irq(ics, nr)) {
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rtas_st(rets, 0, -3); |
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return;
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} |
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/* This is a NOP for now, since the described PAPR semantics don't
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* seem to gel with what Linux does */
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#if 0
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struct ics_irq_state *irq = xics->irqs + (nr - xics->offset);
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ics_write_xive_msi(xics, nr, irq->server, irq->saved_priority);
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#endif
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rtas_st(rets, 0, 0); /* Success */ |
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} |
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struct icp_state *xics_system_init(int nr_irqs) |
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{ |
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CPUState *env; |
428 |
int max_server_num;
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int i;
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struct icp_state *icp;
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struct ics_state *ics;
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max_server_num = -1;
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for (env = first_cpu; env != NULL; env = env->next_cpu) { |
435 |
if (env->cpu_index > max_server_num) {
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max_server_num = env->cpu_index; |
437 |
} |
438 |
} |
439 |
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icp = g_malloc0(sizeof(*icp));
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icp->nr_servers = max_server_num + 1;
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icp->ss = g_malloc0(icp->nr_servers*sizeof(struct icp_server_state)); |
443 |
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for (i = 0; i < icp->nr_servers; i++) { |
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icp->ss[i].mfrr = 0xff;
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} |
447 |
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for (env = first_cpu; env != NULL; env = env->next_cpu) { |
449 |
struct icp_server_state *ss = &icp->ss[env->cpu_index];
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450 |
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451 |
switch (PPC_INPUT(env)) {
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452 |
case PPC_FLAGS_INPUT_POWER7:
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453 |
ss->output = env->irq_inputs[POWER7_INPUT_INT]; |
454 |
break;
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455 |
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case PPC_FLAGS_INPUT_970:
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ss->output = env->irq_inputs[PPC970_INPUT_INT]; |
458 |
break;
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459 |
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default:
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hw_error("XICS interrupt model does not support this CPU bus "
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"model\n");
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exit(1);
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} |
465 |
} |
466 |
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467 |
ics = g_malloc0(sizeof(*ics));
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468 |
ics->nr_irqs = nr_irqs; |
469 |
ics->offset = 16;
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470 |
ics->irqs = g_malloc0(nr_irqs * sizeof(struct ics_irq_state)); |
471 |
|
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icp->ics = ics; |
473 |
ics->icp = icp; |
474 |
|
475 |
for (i = 0; i < nr_irqs; i++) { |
476 |
ics->irqs[i].priority = 0xff;
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ics->irqs[i].saved_priority = 0xff;
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} |
479 |
|
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ics->qirqs = qemu_allocate_irqs(ics_set_irq_msi, ics, nr_irqs); |
481 |
|
482 |
spapr_register_hypercall(H_CPPR, h_cppr); |
483 |
spapr_register_hypercall(H_IPI, h_ipi); |
484 |
spapr_register_hypercall(H_XIRR, h_xirr); |
485 |
spapr_register_hypercall(H_EOI, h_eoi); |
486 |
|
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spapr_rtas_register("ibm,set-xive", rtas_set_xive);
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488 |
spapr_rtas_register("ibm,get-xive", rtas_get_xive);
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spapr_rtas_register("ibm,int-off", rtas_int_off);
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490 |
spapr_rtas_register("ibm,int-on", rtas_int_on);
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492 |
return icp;
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493 |
} |