* PROM library functions for acquiring/using memory descriptors given to
* us from the YAMON.
*/
-#include <linux/config.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
};
#endif
+/* determined physical memory size, not overridden by command line args */
+unsigned long physical_memsize = 0L;
+
struct prom_pmemblock * __init prom_getmdesc(void)
{
char *memsize_str;
unsigned int memsize;
char cmdline[CL_SIZE], *ptr;
- /* Check the command line first for a memsize directive */
+ /* otherwise look in the environment */
+ memsize_str = prom_getenv("memsize");
+ if (!memsize_str) {
+ prom_printf("memsize not set in boot prom, set to default (32Mb)\n");
+ physical_memsize = 0x02000000;
+ } else {
+#ifdef DEBUG
+ prom_printf("prom_memsize = %s\n", memsize_str);
+#endif
+ physical_memsize = simple_strtol(memsize_str, NULL, 0);
+ }
+
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ /* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
+ word of physical memory */
+ physical_memsize -= PAGE_SIZE;
+#endif
+
+ /* Check the command line for a memsize directive that overrides
+ the physical/default amount */
strcpy(cmdline, arcs_cmdline);
ptr = strstr(cmdline, "memsize=");
if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
ptr = strstr(ptr, " memsize=");
- if (ptr) {
+ if (ptr)
memsize = memparse(ptr + 8, &ptr);
- }
- else {
- /* otherwise look in the environment */
- memsize_str = prom_getenv("memsize");
- if (!memsize_str) {
- prom_printf("memsize not set in boot prom, set to default (32Mb)\n");
- memsize = 0x02000000;
- } else {
-#ifdef DEBUG
- prom_printf("prom_memsize = %s\n", memsize_str);
-#endif
- memsize = simple_strtol(memsize_str, NULL, 0);
- }
- }
+ else
+ memsize = physical_memsize;
+
memset(mdesc, 0, sizeof(mdesc));
mdesc[0].type = yamon_dontuse;
if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
continue;
- addr = boot_mem_map.map[i].addr;
+ addr = PAGE_ALIGN(boot_mem_map.map[i].addr);
while (addr < boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size) {
ClearPageReserved(virt_to_page(__va(addr)));