diff options
| -rw-r--r-- | tests/ide-test.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tests/ide-test.c b/tests/ide-test.c index 7307f1d336..bc824a8144 100644 --- a/tests/ide-test.c +++ b/tests/ide-test.c @@ -81,6 +81,7 @@ enum { CMD_IDENTIFY = 0xec, CMDF_ABORT = 0x100, + CMDF_NO_BM = 0x200, }; enum { @@ -192,6 +193,11 @@ static int send_dma_request(int cmd, uint64_t sector, int nb_sectors, g_assert_not_reached(); } + if (flags & CMDF_NO_BM) { + qpci_config_writew(dev, PCI_COMMAND, + PCI_COMMAND_IO | PCI_COMMAND_MEMORY); + } + /* Select device 0 */ outb(IDE_BASE + reg_device, 0 | LBA); @@ -352,6 +358,25 @@ static void test_bmdma_long_prdt(void) assert_bit_clear(inb(IDE_BASE + reg_status), DF | ERR); } +static void test_bmdma_no_busmaster(void) +{ + uint8_t status; + + /* No PRDT_EOT, each entry addr 0/size 64k, and in theory qemu shouldn't be + * able to access it anyway because the Bus Master bit in the PCI command + * register isn't set. This is complete nonsense, but it used to be pretty + * good at confusing and occasionally crashing qemu. */ + PrdtEntry prdt[4096] = { }; + + status = send_dma_request(CMD_READ_DMA | CMDF_NO_BM, 0, 512, + prdt, ARRAY_SIZE(prdt)); + + /* Not entirely clear what the expected result is, but this is what we get + * in practice. At least we want to be aware of any changes. */ + g_assert_cmphex(status, ==, BM_STS_ACTIVE | BM_STS_INTR); + assert_bit_clear(inb(IDE_BASE + reg_status), DF | ERR); +} + static void test_bmdma_setup(void) { ide_test_start( @@ -493,6 +518,7 @@ int main(int argc, char **argv) qtest_add_func("/ide/bmdma/simple_rw", test_bmdma_simple_rw); qtest_add_func("/ide/bmdma/short_prdt", test_bmdma_short_prdt); qtest_add_func("/ide/bmdma/long_prdt", test_bmdma_long_prdt); + qtest_add_func("/ide/bmdma/no_busmaster", test_bmdma_no_busmaster); qtest_add_func("/ide/bmdma/teardown", test_bmdma_teardown); qtest_add_func("/ide/flush", test_flush); |