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allow 1-byte and 2-byte writes to I/O APIC index register

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This commit is contained in:
Stanislav Shwartsman 2012-05-22 14:48:48 +00:00
parent f4134d5d29
commit 88cc825040
1 changed files with 15 additions and 6 deletions
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21
bochs/iodev/ioapic.cc
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@ -73,17 +73,26 @@ static bx_bool ioapic_read(bx_phy_address a20addr, unsigned len, void *data, voi
static bx_bool ioapic_write(bx_phy_address a20addr, unsigned len, void *data, void *param)
{
if (len != 4) {
BX_PANIC(("I/O apic write with len=%d (should be 4)", len));
return 1;
}
if(a20addr & 0xf) {
BX_PANIC(("I/O apic write at unaligned address 0x" FMT_PHY_ADDRX, a20addr));
return 1;
}
theIOAPIC->write_aligned(a20addr, *((Bit32u*) data));
if (len == 4) {
theIOAPIC->write_aligned(a20addr, *((Bit32u*) data));
}
else {
if ((a20addr & 0xff) != 0)
BX_PANIC(("I/O apic write with len=%d (should be 4) at address 0x" FMT_PHY_ADDRX, len, a20addr));
if (len == 2)
theIOAPIC->write_aligned(a20addr, (Bit32u) *((Bit16u*) data));
else if (len == 1)
theIOAPIC->write_aligned(a20addr, (Bit32u) *((Bit8u*) data));
else
BX_PANIC(("Unsupported I/O APIC write at address 0x" FMT_PHY_ADDRX ", len=%d", a20addr, len));
}
return 1;
}