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19d2b5e6ff
The i8257 DMA controller uses an idle bottom half, which by default does not cause the main loop to exit. Therefore, the DMA_schedule function is there to ensure that the CPU relinquishes the iothread mutex to the iothread. However, this is not enough since the iothread will call aio_compute_timeout() and go to sleep again. In the iothread world, forcing execution of the idle bottom half is much simpler, and only requires a call to qemu_notify_event(). Do it, removing the need for the "cpu_request_exit" pseudo-irq. The next patch will remove it. Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
#ifndef HW_ISA_H
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#define HW_ISA_H
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/* ISA bus */
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#include "exec/ioport.h"
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#include "exec/memory.h"
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#include "hw/qdev.h"
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#define ISA_NUM_IRQS 16
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#define TYPE_ISA_DEVICE "isa-device"
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#define ISA_DEVICE(obj) \
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OBJECT_CHECK(ISADevice, (obj), TYPE_ISA_DEVICE)
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#define ISA_DEVICE_CLASS(klass) \
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OBJECT_CLASS_CHECK(ISADeviceClass, (klass), TYPE_ISA_DEVICE)
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#define ISA_DEVICE_GET_CLASS(obj) \
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OBJECT_GET_CLASS(ISADeviceClass, (obj), TYPE_ISA_DEVICE)
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#define TYPE_ISA_BUS "ISA"
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#define ISA_BUS(obj) OBJECT_CHECK(ISABus, (obj), TYPE_ISA_BUS)
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#define TYPE_APPLE_SMC "isa-applesmc"
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#define APPLESMC_MAX_DATA_LENGTH 32
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#define APPLESMC_PROP_IO_BASE "iobase"
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static inline uint16_t applesmc_port(void)
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{
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Object *obj = object_resolve_path_type("", TYPE_APPLE_SMC, NULL);
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if (obj) {
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return object_property_get_int(obj, APPLESMC_PROP_IO_BASE, NULL);
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}
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return 0;
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}
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typedef struct ISADeviceClass {
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DeviceClass parent_class;
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} ISADeviceClass;
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struct ISABus {
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/*< private >*/
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BusState parent_obj;
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/*< public >*/
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MemoryRegion *address_space;
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MemoryRegion *address_space_io;
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qemu_irq *irqs;
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};
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struct ISADevice {
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/*< private >*/
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DeviceState parent_obj;
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/*< public >*/
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uint32_t isairq[2];
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int nirqs;
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int ioport_id;
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};
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ISABus *isa_bus_new(DeviceState *dev, MemoryRegion *address_space,
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MemoryRegion *address_space_io);
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void isa_bus_irqs(ISABus *bus, qemu_irq *irqs);
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qemu_irq isa_get_irq(ISADevice *dev, int isairq);
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void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq);
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MemoryRegion *isa_address_space(ISADevice *dev);
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MemoryRegion *isa_address_space_io(ISADevice *dev);
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ISADevice *isa_create(ISABus *bus, const char *name);
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ISADevice *isa_try_create(ISABus *bus, const char *name);
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ISADevice *isa_create_simple(ISABus *bus, const char *name);
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ISADevice *isa_vga_init(ISABus *bus);
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/**
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* isa_register_ioport: Install an I/O port region on the ISA bus.
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*
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* Register an I/O port region via memory_region_add_subregion
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* inside the ISA I/O address space.
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*
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* @dev: the ISADevice against which these are registered; may be NULL.
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* @io: the #MemoryRegion being registered.
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* @start: the base I/O port.
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*/
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void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start);
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/**
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* isa_register_portio_list: Initialize a set of ISA io ports
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*
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* Several ISA devices have many dis-joint I/O ports. Worse, these I/O
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* ports can be interleaved with I/O ports from other devices. This
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* function makes it easy to create multiple MemoryRegions for a single
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* device and use the legacy portio routines.
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*
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* @dev: the ISADevice against which these are registered; may be NULL.
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* @start: the base I/O port against which the portio->offset is applied.
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* @portio: the ports, sorted by offset.
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* @opaque: passed into the portio callbacks.
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* @name: passed into memory_region_init_io.
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*/
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void isa_register_portio_list(ISADevice *dev, uint16_t start,
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const MemoryRegionPortio *portio,
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void *opaque, const char *name);
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static inline ISABus *isa_bus_from_device(ISADevice *d)
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{
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return ISA_BUS(qdev_get_parent_bus(DEVICE(d)));
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}
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/* dma.c */
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int DMA_get_channel_mode (int nchan);
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int DMA_read_memory (int nchan, void *buf, int pos, int size);
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int DMA_write_memory (int nchan, void *buf, int pos, int size);
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void DMA_hold_DREQ (int nchan);
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void DMA_release_DREQ (int nchan);
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void DMA_schedule(void);
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void DMA_init(int high_page_enable, qemu_irq *cpu_request_exit);
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void DMA_register_channel (int nchan,
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DMA_transfer_handler transfer_handler,
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void *opaque);
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#endif
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