Hi,
I put something together, not even compile tested but might work ;)
Rudolf
Index: physmap.c
===================================================================
--- physmap.c (revision 989)
+++ physmap.c (working copy)
@@ -35,6 +35,25 @@
unsigned short segFS = 0;
+static void *realmem_map;
+
+void *map_first_meg(unsigned long phys_addr, size_t len)
+{
+ if (realmem_map)
+ return realmem_map + phys_addr;
+
+ realmem_map = valloc(1024 * 1024);
+
+ if (!realmem_map)
+ return NULL;
+
+ if (__djgpp_map_physical_memory(realmem_map, (1024 * 1024), 0)) {
+ return NULL;
+ }
+
+ return realmem_map + phys_addr;
+}
+
void *sys_physmap(unsigned long phys_addr, size_t len)
{
int ret;
@@ -46,6 +65,11 @@
__dpmi_set_segment_limit (segFS, 0xffffffff);
}
+ if ((phys_addr + len) < (1024 * 1024)) {
+ /* we need to use another method to map first 1MB */
+ return map_first_meg(phys_addr, len);
+ }
+
mi.address = phys_addr;
mi.size = len;
ret = __dpmi_physical_address_mapping (&mi);
@@ -58,38 +82,14 @@
}
#define sys_physmap_rw_uncached sys_physmap
+#define sys_physmap_ro_cached sys_physmap
-#include <sys/movedata.h>
-#include <sys/segments.h>
-#include <go32.h>
-
-static void *realmem_cpy;
-
-void *sys_physmap_ro_cached(unsigned long phys_addr, size_t len)
-{
- /* no support for not a 1MB of mem */
- if ((phys_addr + len) > 1024*1024)
- return NULL;
-
- if (realmem_cpy)
- return realmem_cpy + phys_addr;
-
- realmem_cpy = valloc(1024*1024);
-
- if (!realmem_cpy)
- return NULL;
-
- movedata(_dos_ds, 0, _my_ds(), (unsigned long) realmem_cpy, 1024*1024);
- return realmem_cpy + phys_addr;
-}
-
-
void physunmap(void *virt_addr, size_t len)
{
__dpmi_meminfo mi;
- /* we ignore unmaps for our cheat 1MB copy */
- if ((virt_addr >= realmem_cpy) && ((virt_addr + len) <= (realmem_cpy + 1024*1024))) {
+ /* we ignore unmaps for our first 1MB */
+ if ((virt_addr >= realmem_map) && ((virt_addr + len) <= (realmem_map + (1024 * 1024)))) {
return;
}
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