aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/kvm/i8259.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/kvm/i8259.c')
-rw-r--r--drivers/kvm/i8259.c450
1 files changed, 0 insertions, 450 deletions
diff --git a/drivers/kvm/i8259.c b/drivers/kvm/i8259.c
deleted file mode 100644
index a679157bc599..000000000000
--- a/drivers/kvm/i8259.c
+++ /dev/null
@@ -1,450 +0,0 @@
-/*
- * 8259 interrupt controller emulation
- *
- * Copyright (c) 2003-2004 Fabrice Bellard
- * Copyright (c) 2007 Intel Corporation
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- * Authors:
- * Yaozu (Eddie) Dong <Eddie.dong@intel.com>
- * Port from Qemu.
- */
-#include <linux/mm.h>
-#include "irq.h"
-
-/*
- * set irq level. If an edge is detected, then the IRR is set to 1
- */
-static inline void pic_set_irq1(struct kvm_kpic_state *s, int irq, int level)
-{
- int mask;
- mask = 1 << irq;
- if (s->elcr & mask) /* level triggered */
- if (level) {
- s->irr |= mask;
- s->last_irr |= mask;
- } else {
- s->irr &= ~mask;
- s->last_irr &= ~mask;
- }
- else /* edge triggered */
- if (level) {
- if ((s->last_irr & mask) == 0)
- s->irr |= mask;
- s->last_irr |= mask;
- } else
- s->last_irr &= ~mask;
-}
-
-/*
- * return the highest priority found in mask (highest = smallest
- * number). Return 8 if no irq
- */
-static inline int get_priority(struct kvm_kpic_state *s, int mask)
-{
- int priority;
- if (mask == 0)
- return 8;
- priority = 0;
- while ((mask & (1 << ((priority + s->priority_add) & 7))) == 0)
- priority++;
- return priority;
-}
-
-/*
- * return the pic wanted interrupt. return -1 if none
- */
-static int pic_get_irq(struct kvm_kpic_state *s)
-{
- int mask, cur_priority, priority;
-
- mask = s->irr & ~s->imr;
- priority = get_priority(s, mask);
- if (priority == 8)
- return -1;
- /*
- * compute current priority. If special fully nested mode on the
- * master, the IRQ coming from the slave is not taken into account
- * for the priority computation.
- */
- mask = s->isr;
- if (s->special_fully_nested_mode && s == &s->pics_state->pics[0])
- mask &= ~(1 << 2);
- cur_priority = get_priority(s, mask);
- if (priority < cur_priority)
- /*
- * higher priority found: an irq should be generated
- */
- return (priority + s->priority_add) & 7;
- else
- return -1;
-}
-
-/*
- * raise irq to CPU if necessary. must be called every time the active
- * irq may change
- */
-static void pic_update_irq(struct kvm_pic *s)
-{
- int irq2, irq;
-
- irq2 = pic_get_irq(&s->pics[1]);
- if (irq2 >= 0) {
- /*
- * if irq request by slave pic, signal master PIC
- */
- pic_set_irq1(&s->pics[0], 2, 1);
- pic_set_irq1(&s->pics[0], 2, 0);
- }
- irq = pic_get_irq(&s->pics[0]);
- if (irq >= 0)
- s->irq_request(s->irq_request_opaque, 1);
- else
- s->irq_request(s->irq_request_opaque, 0);
-}
-
-void kvm_pic_update_irq(struct kvm_pic *s)
-{
- pic_update_irq(s);
-}
-
-void kvm_pic_set_irq(void *opaque, int irq, int level)
-{
- struct kvm_pic *s = opaque;
-
- pic_set_irq1(&s->pics[irq >> 3], irq & 7, level);
- pic_update_irq(s);
-}
-
-/*
- * acknowledge interrupt 'irq'
- */
-static inline void pic_intack(struct kvm_kpic_state *s, int irq)
-{
- if (s->auto_eoi) {
- if (s->rotate_on_auto_eoi)
- s->priority_add = (irq + 1) & 7;
- } else
- s->isr |= (1 << irq);
- /*
- * We don't clear a level sensitive interrupt here
- */
- if (!(s->elcr & (1 << irq)))
- s->irr &= ~(1 << irq);
-}
-
-int kvm_pic_read_irq(struct kvm_pic *s)
-{
- int irq, irq2, intno;
-
- irq = pic_get_irq(&s->pics[0]);
- if (irq >= 0) {
- pic_intack(&s->pics[0], irq);
- if (irq == 2) {
- irq2 = pic_get_irq(&s->pics[1]);
- if (irq2 >= 0)
- pic_intack(&s->pics[1], irq2);
- else
- /*
- * spurious IRQ on slave controller
- */
- irq2 = 7;
- intno = s->pics[1].irq_base + irq2;
- irq = irq2 + 8;
- } else
- intno = s->pics[0].irq_base + irq;
- } else {
- /*
- * spurious IRQ on host controller
- */
- irq = 7;
- intno = s->pics[0].irq_base + irq;
- }
- pic_update_irq(s);
-
- return intno;
-}
-
-static void pic_reset(void *opaque)
-{
- struct kvm_kpic_state *s = opaque;
-
- s->last_irr = 0;
- s->irr = 0;
- s->imr = 0;
- s->isr = 0;
- s->priority_add = 0;
- s->irq_base = 0;
- s->read_reg_select = 0;
- s->poll = 0;
- s->special_mask = 0;
- s->init_state = 0;
- s->auto_eoi = 0;
- s->rotate_on_auto_eoi = 0;
- s->special_fully_nested_mode = 0;
- s->init4 = 0;
-}
-
-static void pic_ioport_write(void *opaque, u32 addr, u32 val)
-{
- struct kvm_kpic_state *s = opaque;
- int priority, cmd, irq;
-
- addr &= 1;
- if (addr == 0) {
- if (val & 0x10) {
- pic_reset(s); /* init */
- /*
- * deassert a pending interrupt
- */
- s->pics_state->irq_request(s->pics_state->
- irq_request_opaque, 0);
- s->init_state = 1;
- s->init4 = val & 1;
- if (val & 0x02)
- printk(KERN_ERR "single mode not supported");
- if (val & 0x08)
- printk(KERN_ERR
- "level sensitive irq not supported");
- } else if (val & 0x08) {
- if (val & 0x04)
- s->poll = 1;
- if (val & 0x02)
- s->read_reg_select = val & 1;
- if (val & 0x40)
- s->special_mask = (val >> 5) & 1;
- } else {
- cmd = val >> 5;
- switch (cmd) {
- case 0:
- case 4:
- s->rotate_on_auto_eoi = cmd >> 2;
- break;
- case 1: /* end of interrupt */
- case 5:
- priority = get_priority(s, s->isr);
- if (priority != 8) {
- irq = (priority + s->priority_add) & 7;
- s->isr &= ~(1 << irq);
- if (cmd == 5)
- s->priority_add = (irq + 1) & 7;
- pic_update_irq(s->pics_state);
- }
- break;
- case 3:
- irq = val & 7;
- s->isr &= ~(1 << irq);
- pic_update_irq(s->pics_state);
- break;
- case 6:
- s->priority_add = (val + 1) & 7;
- pic_update_irq(s->pics_state);
- break;
- case 7:
- irq = val & 7;
- s->isr &= ~(1 << irq);
- s->priority_add = (irq + 1) & 7;
- pic_update_irq(s->pics_state);
- break;
- default:
- break; /* no operation */
- }
- }
- } else
- switch (s->init_state) {
- case 0: /* normal mode */
- s->imr = val;
- pic_update_irq(s->pics_state);
- break;
- case 1:
- s->irq_base = val & 0xf8;
- s->init_state = 2;
- break;
- case 2:
- if (s->init4)
- s->init_state = 3;
- else
- s->init_state = 0;
- break;
- case 3:
- s->special_fully_nested_mode = (val >> 4) & 1;
- s->auto_eoi = (val >> 1) & 1;
- s->init_state = 0;
- break;
- }
-}
-
-static u32 pic_poll_read(struct kvm_kpic_state *s, u32 addr1)
-{
- int ret;
-
- ret = pic_get_irq(s);
- if (ret >= 0) {
- if (addr1 >> 7) {
- s->pics_state->pics[0].isr &= ~(1 << 2);
- s->pics_state->pics[0].irr &= ~(1 << 2);
- }
- s->irr &= ~(1 << ret);
- s->isr &= ~(1 << ret);
- if (addr1 >> 7 || ret != 2)
- pic_update_irq(s->pics_state);
- } else {
- ret = 0x07;
- pic_update_irq(s->pics_state);
- }
-
- return ret;
-}
-
-static u32 pic_ioport_read(void *opaque, u32 addr1)
-{
- struct kvm_kpic_state *s = opaque;
- unsigned int addr;
- int ret;
-
- addr = addr1;
- addr &= 1;
- if (s->poll) {
- ret = pic_poll_read(s, addr1);
- s->poll = 0;
- } else
- if (addr == 0)
- if (s->read_reg_select)
- ret = s->isr;
- else
- ret = s->irr;
- else
- ret = s->imr;
- return ret;
-}
-
-static void elcr_ioport_write(void *opaque, u32 addr, u32 val)
-{
- struct kvm_kpic_state *s = opaque;
- s->elcr = val & s->elcr_mask;
-}
-
-static u32 elcr_ioport_read(void *opaque, u32 addr1)
-{
- struct kvm_kpic_state *s = opaque;
- return s->elcr;
-}
-
-static int picdev_in_range(struct kvm_io_device *this, gpa_t addr)
-{
- switch (addr) {
- case 0x20:
- case 0x21:
- case 0xa0:
- case 0xa1:
- case 0x4d0:
- case 0x4d1:
- return 1;
- default:
- return 0;
- }
-}
-
-static void picdev_write(struct kvm_io_device *this,
- gpa_t addr, int len, const void *val)
-{
- struct kvm_pic *s = this->private;
- unsigned char data = *(unsigned char *)val;
-
- if (len != 1) {
- if (printk_ratelimit())
- printk(KERN_ERR "PIC: non byte write\n");
- return;
- }
- switch (addr) {
- case 0x20:
- case 0x21:
- case 0xa0:
- case 0xa1:
- pic_ioport_write(&s->pics[addr >> 7], addr, data);
- break;
- case 0x4d0:
- case 0x4d1:
- elcr_ioport_write(&s->pics[addr & 1], addr, data);
- break;
- }
-}
-
-static void picdev_read(struct kvm_io_device *this,
- gpa_t addr, int len, void *val)
-{
- struct kvm_pic *s = this->private;
- unsigned char data = 0;
-
- if (len != 1) {
- if (printk_ratelimit())
- printk(KERN_ERR "PIC: non byte read\n");
- return;
- }
- switch (addr) {
- case 0x20:
- case 0x21:
- case 0xa0:
- case 0xa1:
- data = pic_ioport_read(&s->pics[addr >> 7], addr);
- break;
- case 0x4d0:
- case 0x4d1:
- data = elcr_ioport_read(&s->pics[addr & 1], addr);
- break;
- }
- *(unsigned char *)val = data;
-}
-
-/*
- * callback when PIC0 irq status changed
- */
-static void pic_irq_request(void *opaque, int level)
-{
- struct kvm *kvm = opaque;
- struct kvm_vcpu *vcpu = kvm->vcpus[0];
-
- pic_irqchip(kvm)->output = level;
- if (vcpu)
- kvm_vcpu_kick(vcpu);
-}
-
-struct kvm_pic *kvm_create_pic(struct kvm *kvm)
-{
- struct kvm_pic *s;
- s = kzalloc(sizeof(struct kvm_pic), GFP_KERNEL);
- if (!s)
- return NULL;
- s->pics[0].elcr_mask = 0xf8;
- s->pics[1].elcr_mask = 0xde;
- s->irq_request = pic_irq_request;
- s->irq_request_opaque = kvm;
- s->pics[0].pics_state = s;
- s->pics[1].pics_state = s;
-
- /*
- * Initialize PIO device
- */
- s->dev.read = picdev_read;
- s->dev.write = picdev_write;
- s->dev.in_range = picdev_in_range;
- s->dev.private = s;
- kvm_io_bus_register_dev(&kvm->pio_bus, &s->dev);
- return s;
-}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.