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kaf24@scramble.cl.cam.ac.uk
d47201cc4f
Many files: Fix the minos license so that it is usable for XP and BSD ports. minios.lds: Rename: extras/mini-os/vmlinux.lds -> extras/mini-os/minios.lds .del-list.h~d612a8726e8d42e: Delete: extras/mini-os/h/list.h .del-COPYING~1f9753354580bd13: Delete: extras/mini-os/COPYING
91 lines
3.3 KiB
C
91 lines
3.3 KiB
C
/******************************************************************************
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* hypervisor.c
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*
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* Communication to/from hypervisor.
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*
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* Copyright (c) 2002-2003, K A Fraser
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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
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell 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 THE
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* 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
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <os.h>
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#include <hypervisor.h>
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static unsigned long event_mask = 0;
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static unsigned long ev_err_count;
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void do_hypervisor_callback(struct pt_regs *regs)
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{
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unsigned long events, flags;
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shared_info_t *shared = HYPERVISOR_shared_info;
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do {
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/* Specialised local_irq_save(). */
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flags = test_and_clear_bit(EVENTS_MASTER_ENABLE_BIT,
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&shared->events_mask);
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barrier();
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events = xchg(&shared->events, 0);
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events &= event_mask;
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/* 'events' now contains some pending events to handle. */
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__asm__ __volatile__ (
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" push %1 ;"
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" sub $4,%%esp ;"
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" jmp 2f ;"
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"1: btrl %%eax,%0 ;" /* clear bit */
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" mov %%eax,(%%esp) ;"
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" call do_event ;" /* do_event(event) */
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"2: bsfl %0,%%eax ;" /* %eax == bit # */
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" jnz 1b ;"
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" add $8,%%esp ;"
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/* we use %ebx because it is callee-saved */
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: : "b" (events), "r" (regs)
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/* clobbered by callback function calls */
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: "eax", "ecx", "edx", "memory" );
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/* Specialised local_irq_restore(). */
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if ( flags ) set_bit(EVENTS_MASTER_ENABLE_BIT, &shared->events_mask);
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barrier();
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}
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while ( shared->events );
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}
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void enable_hypervisor_event(unsigned int ev)
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{
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set_bit(ev, &event_mask);
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set_bit(ev, &HYPERVISOR_shared_info->events_mask);
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if ( test_bit(EVENTS_MASTER_ENABLE_BIT,
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&HYPERVISOR_shared_info->events_mask) )
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do_hypervisor_callback(NULL);
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}
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void disable_hypervisor_event(unsigned int ev)
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{
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clear_bit(ev, &event_mask);
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clear_bit(ev, &HYPERVISOR_shared_info->events_mask);
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}
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void ack_hypervisor_event(unsigned int ev)
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{
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if ( !(event_mask & (1<<ev)) )
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atomic_inc((atomic_t *)&ev_err_count);
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set_bit(ev, &HYPERVISOR_shared_info->events_mask);
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}
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