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Add a second direct map window to increase the maximum RAM this platform

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can deal with from 1GB to 2GB.   I have no way to test with >1GB because I
don't have high enough density memory to get any one box over 1GB.  However, I
have tested it on xp1000 & ds10 with < 1GB of memory & have verified that it
does no harm.
This commit is contained in:
gallatin 1999-11-03 01:16:11 +00:00
parent ef92fd8274
commit cc3fdb5fc5
1 changed files with 43 additions and 28 deletions
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71
sys/alpha/pci/tsunami.c
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@ -413,37 +413,52 @@ static driver_t tsunami_driver = {
static void
pchip_init(volatile tsunami_pchip *pchip, int index)
{
#if 0
/*
* The code below, if active, would attempt to
* setup the DMA base and size registers of Window 0
* to emulate the placement of the direct-mapped window
* on previous chipsets.
int i;
/*
* initialize the direct map DMA windows.
*
* HOWEVER: doing this means that a 64-bit card at device 11
* would not be able to be setup for DMA.
*
* For now, we just trust the SRM console to set things up
* properly. This works on the xp1000, but may need to be
* to be revisited for other systems.
*/
printf("initializing pchip%d\n", index);
pchip->wsba[0].reg = 1L | (1024*1024*1024U & 0xfff00000U);
pchip->wsm[0].reg = (1024*1024*1024U - 1) & 0xfff00000UL;
pchip->tba[0].reg = 0;
/*
* disable windows 1, 2 and 3
* leave window 0 untouched; we'll set that up for S/G DMA for
* isa devices later in the boot process
*
* window 1 goes at 2GB and has a length of 1 GB. It maps
* physical address 0 - 1GB. The SRM console typically sets
* this window up here.
*/
pchip->wsba[1].reg = 0;
pchip->wsba[2].reg = 0;
pchip->wsba[3].reg = 0;
alpha_mb();
#endif
pchip->wsba[1].reg = (2UL*1024*1024*1024) | WINDOW_ENABLE;
pchip->wsm[1].reg = (1UL*1024*1024*1024 - 1) & 0xfff00000UL;
pchip->tba[1].reg = 0;
/*
* window 2 goes at 3GB and has a length of 1 GB. It maps
* physical address 1GB-2GB.
*/
pchip->wsba[2].reg = (3UL*1024*1024*1024) | WINDOW_ENABLE;
pchip->wsm[2].reg = (1UL*1024*1024*1024 - 1) & 0xfff00000UL;
pchip->tba[2].reg = 1UL*1024*1024*1024;
/*
* window 3 is disabled. The SRM console typically leaves it
* disabled
*/
pchip->wsba[3].reg = 0;
alpha_mb();
if(bootverbose) {
printf("pchip%d:\n", index);
for (i = 0; i < 4; i++) {
printf("\twsba[%d].reg = 0x%lx\n",
i, pchip->wsba[i].reg);
printf("\t wsm[%d].reg = 0x%lx\n",
i, pchip->wsm[i].reg);
printf("\t tba[%d].reg = 0x%lx\n",
i, pchip->tba[i].reg);
}
}
}
#define TSUNAMI_SGMAP_BASE (8*1024*1024)