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pcnet: Fix sign extension: make ipxe work with >2G RAM 

The problem is with definitions in hw/pcnet.c such as:

  #define CSR_CRDA(S)      ((S)->csr[28] | ((S)->csr[29] << 16))

"(S)->csr[29]" is a uint16_t, but "(S)->csr[29] << 16" gets promoted to
int, so the overall CSR_CRDA(s) is a (signed) int rather than a uint32_t.

This then gets assigned to a uint64_t using

  target_phys_addr_t crda = CSR_CRDA(s);

so when (S)->csr[29] has the high bit set, we end up with
crda=0xffffffffxxxxxxxx.

From: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Michael Brown 2011-03-15 10:47:22 -06:00 committed by Aurelien Jarno
parent e318a60b94
commit 366c933245
1 changed files with 15 additions and 15 deletions
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30
hw/pcnet.c
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@ -113,23 +113,23 @@ struct qemu_ether_header {
#define CSR_XMTRL(S) ((S)->csr[78])
#define CSR_MISSC(S) ((S)->csr[112])
#define CSR_IADR(S) ((S)->csr[ 1] | ((S)->csr[ 2] << 16))
#define CSR_CRBA(S) ((S)->csr[18] | ((S)->csr[19] << 16))
#define CSR_CXBA(S) ((S)->csr[20] | ((S)->csr[21] << 16))
#define CSR_NRBA(S) ((S)->csr[22] | ((S)->csr[23] << 16))
#define CSR_BADR(S) ((S)->csr[24] | ((S)->csr[25] << 16))
#define CSR_NRDA(S) ((S)->csr[26] | ((S)->csr[27] << 16))
#define CSR_CRDA(S) ((S)->csr[28] | ((S)->csr[29] << 16))
#define CSR_BADX(S) ((S)->csr[30] | ((S)->csr[31] << 16))
#define CSR_NXDA(S) ((S)->csr[32] | ((S)->csr[33] << 16))
#define CSR_CXDA(S) ((S)->csr[34] | ((S)->csr[35] << 16))
#define CSR_NNRD(S) ((S)->csr[36] | ((S)->csr[37] << 16))
#define CSR_NNXD(S) ((S)->csr[38] | ((S)->csr[39] << 16))
#define CSR_PXDA(S) ((S)->csr[60] | ((S)->csr[61] << 16))
#define CSR_NXBA(S) ((S)->csr[64] | ((S)->csr[65] << 16))
#define CSR_IADR(S) ((S)->csr[ 1] | ((uint32_t)(S)->csr[ 2] << 16))
#define CSR_CRBA(S) ((S)->csr[18] | ((uint32_t)(S)->csr[19] << 16))
#define CSR_CXBA(S) ((S)->csr[20] | ((uint32_t)(S)->csr[21] << 16))
#define CSR_NRBA(S) ((S)->csr[22] | ((uint32_t)(S)->csr[23] << 16))
#define CSR_BADR(S) ((S)->csr[24] | ((uint32_t)(S)->csr[25] << 16))
#define CSR_NRDA(S) ((S)->csr[26] | ((uint32_t)(S)->csr[27] << 16))
#define CSR_CRDA(S) ((S)->csr[28] | ((uint32_t)(S)->csr[29] << 16))
#define CSR_BADX(S) ((S)->csr[30] | ((uint32_t)(S)->csr[31] << 16))
#define CSR_NXDA(S) ((S)->csr[32] | ((uint32_t)(S)->csr[33] << 16))
#define CSR_CXDA(S) ((S)->csr[34] | ((uint32_t)(S)->csr[35] << 16))
#define CSR_NNRD(S) ((S)->csr[36] | ((uint32_t)(S)->csr[37] << 16))
#define CSR_NNXD(S) ((S)->csr[38] | ((uint32_t)(S)->csr[39] << 16))
#define CSR_PXDA(S) ((S)->csr[60] | ((uint32_t)(S)->csr[61] << 16))
#define CSR_NXBA(S) ((S)->csr[64] | ((uint32_t)(S)->csr[65] << 16))
#define PHYSADDR(S,A) \
(BCR_SSIZE32(S) ? (A) : (A) | ((0xff00 & (uint32_t)(s)->csr[2])<<16))
(BCR_SSIZE32(S) ? (A) : (A) | ((0xff00 & (uint32_t)(S)->csr[2])<<16))
struct pcnet_initblk16 {
uint16_t mode;