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-win2k-hack performance+DMA support (Leonardo E. Reiter) 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1841 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2006-04-23 22:21:30 +00:00
parent fa7cf687ac
commit e774a278d8
1 changed files with 15 additions and 2 deletions
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17
hw/ide.c
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@ -336,6 +336,7 @@ typedef struct IDEState {
uint8_t *data_end;
uint8_t io_buffer[MAX_MULT_SECTORS*512 + 4];
QEMUTimer *sector_write_timer; /* only used for win2k instal hack */
uint32_t irq_count; /* counts IRQs when using win2k install hack */
} IDEState;
#define BM_STATUS_DMAING 0x01
@ -712,7 +713,7 @@ static void ide_sector_write(IDEState *s)
ide_set_sector(s, sector_num + n);
#ifdef TARGET_I386
if (win2k_install_hack) {
if (win2k_install_hack && ((++s->irq_count % 16) == 0)) {
/* It seems there is a bug in the Windows 2000 installer HDD
IDE driver which fills the disk with empty logs when the
IDE write IRQ comes too early. This hack tries to correct
@ -750,7 +751,19 @@ static int ide_write_dma_cb(IDEState *s,
if (n == 0) {
/* end of transfer */
s->status = READY_STAT | SEEK_STAT;
ide_set_irq(s);
#ifdef TARGET_I386
if (win2k_install_hack && ((++s->irq_count % 16) == 0)) {
/* It seems there is a bug in the Windows 2000 installer
HDD IDE driver which fills the disk with empty logs
when the IDE write IRQ comes too early. This hack tries
to correct that at the expense of slower write
performances. Use this option _only_ to install Windows
2000. You must disable it for normal use. */
qemu_mod_timer(s->sector_write_timer,
qemu_get_clock(vm_clock) + (ticks_per_sec / 1000));
} else
#endif
ide_set_irq(s);
return 0;
}
if (n > MAX_MULT_SECTORS)