From: Philip Homburg <philip@cs.vu.nl>
Date: Mon, 13 Mar 2006 15:36:57 +0000 (+0000)
Subject: Added boot environment option 'ata_no_dma' to disable DMA.
X-Git-Tag: v3.1.2a~246
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/addsub.png?a=commitdiff_plain;h=4ca6f516c67504b37fa2aa779de7d210e692d140;p=minix.git

Added boot environment option 'ata_no_dma' to disable DMA.
---

diff --git a/drivers/at_wini/at_wini.c b/drivers/at_wini/at_wini.c
index 4273ce55a..8599f2686 100644
--- a/drivers/at_wini/at_wini.c
+++ b/drivers/at_wini/at_wini.c
@@ -252,7 +252,7 @@ struct command {
 int timeout_ticks = DEF_TIMEOUT_TICKS, max_errors = MAX_ERRORS;
 int wakeup_ticks = WAKEUP;
 long w_standard_timeouts = 0, w_pci_debug = 0, w_instance = 0,
-	atapi_debug = 0;
+	disable_dma = 0, atapi_debug = 0;
 
 int w_testing = 0, w_silent = 0;
 
@@ -419,20 +419,19 @@ PRIVATE void init_params()
   env_parse("ata_std_timeout", "d", 0, &w_standard_timeouts, 0, 1);
   env_parse("ata_pci_debug", "d", 0, &w_pci_debug, 0, 1);
   env_parse("ata_instance", "d", 0, &w_instance, 0, 8);
+  env_parse("ata_no_dma", "d", 0, &disable_dma, 0, 1);
   env_parse("atapi_debug", "d", 0, &atapi_debug, 0, 1);
 
+  if (disable_dma)
+	printf("DMA for ATA devices is disabled.\n");
+
   s= sys_umap(SELF, D, (vir_bytes)dma_buf, sizeof(dma_buf), &dma_buf_phys);
   if (s != 0)
 	panic("at_wini", "can't map dma buffer", s);
-  printf("init_params: got phys 0x%x for dma buffer at 0x%x\n",
-	dma_buf_phys, (vir_bytes)dma_buf);
 
   s= sys_umap(SELF, D, (vir_bytes)prdt, sizeof(prdt), &prdt_phys);
   if (s != 0)
 	panic("at_wini", "can't map prd table", s);
-  printf("init_params: got phys 0x%x for prd table at 0x%x\n",
-	prdt_phys, (vir_bytes)prdt);
-
 
   if (w_instance == 0) {
 	  /* Get the number of drives from the BIOS data area */
@@ -824,7 +823,9 @@ PRIVATE int w_identify()
 					NO_NUM);
 			}
 		}
-		if (id_dma && dma_base)
+		if (disable_dma)
+			;	/* DMA is disabled */
+		else if (id_dma && dma_base)
 		{
 			w= id_word(ID_MULTIWORD_DMA);
 			if (w & (ID_MWDMA_2_SUP|ID_MWDMA_1_SUP|ID_MWDMA_0_SUP))