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port 92 access

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@708 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-04-05 20:26:03 +00:00
parent 57c3072482
commit e1a237441d
1 changed files with 14 additions and 0 deletions
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14
hw/pc.c
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@ -177,6 +177,17 @@ static uint32_t speaker_ioport_read(void *opaque, uint32_t addr)
(dummy_refresh_clock << 4);
}
static void ioport92_write(void *opaque, uint32_t addr, uint32_t val)
{
cpu_x86_set_a20(cpu_single_env, (val >> 1) & 1);
/* XXX: bit 0 is fast reset */
}
static uint32_t ioport92_read(void *opaque, uint32_t addr)
{
return ((cpu_single_env->a20_mask >> 20) & 1) << 1;
}
/***********************************************************/
/* Bochs BIOS debug ports */
@ -355,6 +366,9 @@ void pc_init(int ram_size, int vga_ram_size, int boot_device,
register_ioport_read(0x61, 1, 1, speaker_ioport_read, NULL);
register_ioport_write(0x61, 1, 1, speaker_ioport_write, NULL);
register_ioport_read(0x92, 1, 1, ioport92_read, NULL);
register_ioport_write(0x92, 1, 1, ioport92_write, NULL);
pic_init();
pit_init(0x40, 0);