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memory: Provide separate handling of unassigned io ports accesses

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Accesses to unassigned io ports shall return -1 on read and be ignored
on write. Ensure these properties via dedicated ops, decoupling us from
the memory core's handling of unassigned accesses.

Cc: qemu-stable@nongnu.org
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka
2013-09-05 18:11:43 +02:00
committed by Paolo Bonzini
parent 8826624970
commit 3bb28b7208
3 changed files with 22 additions and 1 deletions
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include/exec/ioport.h
+4
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@@ -45,6 +45,10 @@ typedef struct MemoryRegionPortio {
#define PORTIO_END_OF_LIST() { }
#ifndef CONFIG_USER_ONLY
extern const MemoryRegionOps unassigned_io_ops;
#endif
void cpu_outb(pio_addr_t addr, uint8_t val);
void cpu_outw(pio_addr_t addr, uint16_t val);
void cpu_outl(pio_addr_t addr, uint32_t val);