diff options
Diffstat (limited to 'physmap.c')
| -rw-r--r-- | physmap.c | 31 |
1 files changed, 21 insertions, 10 deletions
@@ -38,29 +38,40 @@ #ifdef __DJGPP__ #include <dpmi.h> +#include <malloc.h> #include <sys/nearptr.h> +#define ONE_MEGABYTE (1024 * 1024) #define MEM_DEV "dpmi" -static void *realmem_map; +static void *realmem_map_aligned; static void *map_first_meg(uintptr_t phys_addr, size_t len) { - if (realmem_map) - return realmem_map + phys_addr; + void *realmem_map; + size_t pagesize; - realmem_map = valloc(1024 * 1024); + if (realmem_map_aligned) + return realmem_map_aligned + phys_addr; + + /* valloc() from DJGPP 2.05 does not work properly */ + pagesize = getpagesize(); + + realmem_map = malloc(ONE_MEGABYTE + pagesize); if (!realmem_map) return ERROR_PTR; - if (__djgpp_map_physical_memory(realmem_map, (1024 * 1024), 0)) { + realmem_map_aligned = (void *)(((size_t) realmem_map + + (pagesize - 1)) & ~(pagesize - 1)); + + if (__djgpp_map_physical_memory(realmem_map_aligned, ONE_MEGABYTE, 0)) { free(realmem_map); - realmem_map = NULL; + realmem_map_aligned = NULL; return ERROR_PTR; } - return realmem_map + phys_addr; + return realmem_map_aligned + phys_addr; } static void *sys_physmap(uintptr_t phys_addr, size_t len) @@ -72,7 +83,7 @@ static void *sys_physmap(uintptr_t phys_addr, size_t len) if (!__djgpp_nearptr_enable()) return ERROR_PTR; - if ((phys_addr + len - 1) < (1024 * 1024)) { + if ((phys_addr + len - 1) < ONE_MEGABYTE) { /* We need to use another method to map first 1MB. */ return map_first_meg(phys_addr, len); } @@ -97,8 +108,8 @@ void sys_physunmap_unaligned(void *virt_addr, size_t len) /* There is no known way to unmap the first 1 MB. The DPMI server will * do this for us on exit. */ - if ((virt_addr >= realmem_map) && - ((virt_addr + len) <= (realmem_map + (1024 * 1024)))) { + if ((virt_addr >= realmem_map_aligned) && + ((virt_addr + len) <= (realmem_map_aligned + ONE_MEGABYTE))) { return; } |