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qemu: add cpu_unregister_io_memory and make io mem table index dynamic (Marcelo Tosatti)

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So drivers can clear their mem io table entries on exit back to unassigned
state.

Also make the io mem index allocation dynamic.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6601 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-02-11 15:20:58 +00:00
parent 8b13c4a794
commit 8871565764
2 changed files with 35 additions and 5 deletions
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1
cpu-all.h
View file

@ -909,6 +909,7 @@ int cpu_register_io_memory(int io_index,
CPUReadMemoryFunc **mem_read,
CPUWriteMemoryFunc **mem_write,
void *opaque);
void cpu_unregister_io_memory(int table_address);
CPUWriteMemoryFunc **cpu_get_io_memory_write(int io_index);
CPUReadMemoryFunc **cpu_get_io_memory_read(int io_index);

39
exec.c
View file

@ -179,7 +179,7 @@ static void io_mem_init(void);
CPUWriteMemoryFunc *io_mem_write[IO_MEM_NB_ENTRIES][4];
CPUReadMemoryFunc *io_mem_read[IO_MEM_NB_ENTRIES][4];
void *io_mem_opaque[IO_MEM_NB_ENTRIES];
static int io_mem_nb;
char io_mem_used[IO_MEM_NB_ENTRIES];
static int io_mem_watch;
#endif
@ -2799,12 +2799,28 @@ static void *subpage_init (target_phys_addr_t base, ram_addr_t *phys,
return mmio;
}
static int get_free_io_mem_idx(void)
{
int i;
for (i = 0; i<IO_MEM_NB_ENTRIES; i++)
if (!io_mem_used[i]) {
io_mem_used[i] = 1;
return i;
}
return -1;
}
static void io_mem_init(void)
{
int i;
cpu_register_io_memory(IO_MEM_ROM >> IO_MEM_SHIFT, error_mem_read, unassigned_mem_write, NULL);
cpu_register_io_memory(IO_MEM_UNASSIGNED >> IO_MEM_SHIFT, unassigned_mem_read, unassigned_mem_write, NULL);
cpu_register_io_memory(IO_MEM_NOTDIRTY >> IO_MEM_SHIFT, error_mem_read, notdirty_mem_write, NULL);
io_mem_nb = 5;
for (i=0; i<5; i++)
io_mem_used[i] = 1;
io_mem_watch = cpu_register_io_memory(0, watch_mem_read,
watch_mem_write, NULL);
@ -2829,9 +2845,9 @@ int cpu_register_io_memory(int io_index,
int i, subwidth = 0;
if (io_index <= 0) {
if (io_mem_nb >= IO_MEM_NB_ENTRIES)
return -1;
io_index = io_mem_nb++;
io_index = get_free_io_mem_idx();
if (io_index == -1)
return io_index;
} else {
if (io_index >= IO_MEM_NB_ENTRIES)
return -1;
@ -2847,6 +2863,19 @@ int cpu_register_io_memory(int io_index,
return (io_index << IO_MEM_SHIFT) | subwidth;
}
void cpu_unregister_io_memory(int io_table_address)
{
int i;
int io_index = io_table_address >> IO_MEM_SHIFT;
for (i=0;i < 3; i++) {
io_mem_read[io_index][i] = unassigned_mem_read[i];
io_mem_write[io_index][i] = unassigned_mem_write[i];
}
io_mem_opaque[io_index] = NULL;
io_mem_used[io_index] = 0;
}
CPUWriteMemoryFunc **cpu_get_io_memory_write(int io_index)
{
return io_mem_write[io_index >> IO_MEM_SHIFT];