libpci: djgpp: Handle Windows NTVDM zero error codes

Windows NTVDM DPMI host clears the AX register for unsupported DPMI calls.
So handle zero error code as ENOSYS instead of default case EACCES.

diff --git a/lib/physmem-djgpp.c b/lib/physmem-djgpp.c
index 4215069341221f31ad68eda46a492a9da7f219b1..a3c0733fc6bd4db20191609b3cd562673074eb03 100644 (file)
--- a/lib/physmem-djgpp.c
+++ b/lib/physmem-djgpp.c
@@ -163,6 +163,7 @@ set_and_get_page_attributes(__dpmi_meminfo *mi, short *attributes)
       free(attributes);
       switch (error)
         {
+        case 0x0000: /* Unsupported function (returned by Windows NTVDM, error number is cleared) */
         case 0x0507: /* Unsupported function (returned by DPMI 0.9 host, error number is same as DPMI function number) */
         case 0x8001: /* Unsupported function (returned by DPMI 1.0 host) */
           errno = ENOSYS;
@@ -196,6 +197,7 @@ set_and_get_page_attributes(__dpmi_meminfo *mi, short *attributes)
       free(attributes);
       switch (error)
         {
+        case 0x0000: /* Unsupported function (returned by Windows NTVDM, error number is cleared) */
         case 0x0506: /* Unsupported function (returned by DPMI 0.9 host, error number is same as DPMI function number) */
         case 0x8001: /* Unsupported function (returned by DPMI 1.0 host) */
           errno = ENOSYS;
@@ -540,6 +542,7 @@ physmem_map(struct physmem *physmem, u64 addr, size_t length, int w)
                         aligned_free(ptr);
                       switch (error)
                         {
+                        case 0x0000: /* Unsupported function (returned by Windows NTVDM, error number is cleared) */
                         case 0x0509: /* Unsupported function (returned by DPMI 0.9 host, error number is same as DPMI function number) */
                         case 0x8001: /* Unsupported function (returned by DPMI 1.0 host) */
                           /*
@@ -583,6 +586,7 @@ physmem_map(struct physmem *physmem, u64 addr, size_t length, int w)
                     aligned_free(ptr);
                   switch (error)
                     {
+                    case 0x0000: /* Unsupported function (returned by Windows NTVDM, error number is cleared) */
                     case 0x0508: /* Unsupported function (returned by DPMI 0.9 host, error number is same as DPMI function number) */
                     case 0x8001: /* Unsupported function (returned by DPMI 1.0 host) */
                       errno = ENOSYS;
@@ -909,6 +913,7 @@ retry_via_indirect_change:
             {
               switch (__dpmi_error)
                 {
+                case 0x0000: /* Unsupported function (returned by Windows NTVDM, error number is cleared) */
                 case 0x0801: /* Unsupported function (returned by DPMI 0.9 host, error number is same as DPMI function number) */
                 case 0x8001: /* Unsupported function (returned by DPMI 1.0 host) */
                   errno = ENOSYS;