This workarounds a bug in memory management. To reproduce the problem, try to start the Windows NT 4.0/MIPS installer. After loading some files, you should see a screen saying "To set up Windows NT now, press ENTER." However, you're welcomed with an IRQL_NOT_LESS_OR_EQUAL bugcheck or an Unknown Hard Error c0000221.
Signed-off-by: Hervé Poussineau <hpous...@reactos.org> --- hw/dma/rc4030.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/hw/dma/rc4030.c b/hw/dma/rc4030.c index 3efa6de..d265d6c 100644 --- a/hw/dma/rc4030.c +++ b/hw/dma/rc4030.c @@ -681,6 +681,7 @@ static void rc4030_do_dma(void *opaque, int n, uint8_t *buf, int len, int is_wri rc4030State *s = opaque; hwaddr dma_addr; int dev_to_mem; + int i; s->dma_regs[n][DMA_REG_ENABLE] &= ~(DMA_FLAG_TC_INTR | DMA_FLAG_MEM_INTR | DMA_FLAG_ADDR_INTR); @@ -699,8 +700,22 @@ static void rc4030_do_dma(void *opaque, int n, uint8_t *buf, int len, int is_wri dma_addr = s->dma_regs[n][DMA_REG_ADDRESS]; /* Read/write data at right place */ +#if 1 /* workaround for a bug in memory management */ + for (i = 0; i < len; ) { + int ncpy = DMA_PAGESIZE - (dma_addr & (DMA_PAGESIZE - 1)); + if (ncpy > len - i) { + ncpy = len - i; + } + address_space_rw(&s->dma_as, dma_addr, MEMTXATTRS_UNSPECIFIED, + buf + i, ncpy, is_write); + + dma_addr += ncpy; + i += ncpy; + } +#else address_space_rw(&s->dma_as, dma_addr, MEMTXATTRS_UNSPECIFIED, buf, len, is_write); +#endif s->dma_regs[n][DMA_REG_ENABLE] |= DMA_FLAG_TC_INTR; s->dma_regs[n][DMA_REG_COUNT] -= len; -- 2.1.4