SCSI and USB async IO support.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2107 c046a42c-6fe2-441c-8c8c-71466251a162

2 files changed, 30 insertions, 0 deletions

diff --git a/pc-bios/openbios-esp.diff b/pc-bios/openbios-esp.diff
new file mode 100644
index 0000000000..5d4f836f12
--- /dev/null
+++ b/pc-bios/openbios-esp.diff
@@ -0,0 +1,30 @@
+The ESP SCSI driver currently doesn't check whether a DMA requests has 
+completed before checking its status. On older qemu versions this works ok 
+because DMA happens instantly. On never qemu DMA can take an indeterminate 
+amount of time ooto complete, just like on real hardware.
+
+The patch below waits for the controller to raise the DMA interrupt after 
+initiating a DMA request.
+
+Index: drivers/esp.c
+===================================================================
+--- drivers/esp.c	(revision 61)
++++ drivers/esp.c	(working copy)
+@@ -113,6 +113,8 @@ do_command(esp_private_t *esp, sd_privat
+     esp->espdma.regs->cond_reg = 0;
+     // Set ATN, issue command
+     esp->ll->regs[ESP_CMD] = ESP_CMD_SELA | ESP_CMD_DMA;
++    // Wait for DMA to complete
++    while ((esp->espdma.regs->cond_reg & DMA_HNDL_INTR) == 0) /* no-op */;
+     // Check status
+     status = esp->ll->regs[ESP_STATUS];
+ 
+@@ -129,6 +131,8 @@ do_command(esp_private_t *esp, sd_privat
+     esp->espdma.regs->cond_reg = DMA_ST_WRITE;
+     // Transfer
+     esp->ll->regs[ESP_CMD] = ESP_CMD_TI | ESP_CMD_DMA;
++    // Wait for DMA to complete
++    while ((esp->espdma.regs->cond_reg & DMA_HNDL_INTR) == 0) /* no-op */;
+     // Check status
+     status = esp->ll->regs[ESP_STATUS];
+ 
diff --git a/pc-bios/openbios-sparc32 b/pc-bios/openbios-sparc32
index 7a729aa81b..04b60776df 100644
--- a/pc-bios/openbios-sparc32
+++ b/pc-bios/openbios-sparc32