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Prevent overwriting fixed bits in AFSR 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3752 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
blueswir1 2007-12-01 14:51:24 +00:00
parent 5ad6bb97a4
commit c52428fcb1
1 changed files with 4 additions and 0 deletions
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4
hw/iommu.c
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@ -74,6 +74,7 @@ do { printf("IOMMU: " fmt , ##args); } while (0)
#define IOMMU_AFSR_ME 0x00080000 /* Multiple errors occurred */
#define IOMMU_AFSR_RD 0x00040000 /* A read operation was in progress */
#define IOMMU_AFSR_FAV 0x00020000 /* IOMMU afar has valid contents */
#define IOMMU_AFSR_MASK 0xff0fffff
#define IOMMU_AFAR (0x1004 >> 2)
@ -179,6 +180,9 @@ static void iommu_mem_writew(void *opaque, target_phys_addr_t addr,
DPRINTF("page flush %x\n", val);
s->regs[saddr] = val & IOMMU_PGFLUSH_MASK;
break;
case IOMMU_AFSR:
s->regs[saddr] = (val & IOMMU_AFSR_MASK) | IOMMU_AFSR_RESV;
break;
case IOMMU_SBCFG0:
case IOMMU_SBCFG1:
case IOMMU_SBCFG2: