aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/kernel/setup.c
diff options
context:
space:
mode:
authorRalf Baechle <ralf@linux-mips.org>2007-11-02 22:05:43 -0400
committerRalf Baechle <ralf@linux-mips.org>2007-11-26 12:26:14 -0500
commitcce335ae47e231398269fb05fa48e0e9cbf289e0 (patch)
treea01ea9ad318d459393a905df5c53b68b754300da /arch/mips/kernel/setup.c
parent940f6b48a130e0a33cb8bd397dd0e277166470ad (diff)
[MIPS] 64-bit Sibyte kernels need DMA32.
Sibyte SOCs only have 32-bit PCI. Due to the sparse use of the address space only the first 1GB of memory is mapped at physical addresses below 1GB. If a system has more than 1GB of memory 32-bit DMA will not be able to reach all of it. For now this patch is good enough to keep Sibyte users happy but it seems eventually something like swiotlb will be needed for Sibyte. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/setup.c')
-rw-r--r--arch/mips/kernel/setup.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index a06a27d6cfcd..7f6ddcb5d485 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -269,7 +269,7 @@ static void __init bootmem_init(void)
269 269
270static void __init bootmem_init(void) 270static void __init bootmem_init(void)
271{ 271{
272 unsigned long reserved_end; 272 unsigned long init_begin, reserved_end;
273 unsigned long mapstart = ~0UL; 273 unsigned long mapstart = ~0UL;
274 unsigned long bootmap_size; 274 unsigned long bootmap_size;
275 int i; 275 int i;
@@ -342,6 +342,35 @@ static void __init bootmem_init(void)
342 */ 342 */
343 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart, 343 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
344 min_low_pfn, max_low_pfn); 344 min_low_pfn, max_low_pfn);
345
346
347 init_begin = PFN_UP(__pa_symbol(&__init_begin));
348 for (i = 0; i < boot_mem_map.nr_map; i++) {
349 unsigned long start, end;
350
351 start = PFN_UP(boot_mem_map.map[i].addr);
352 end = PFN_DOWN(boot_mem_map.map[i].addr
353 + boot_mem_map.map[i].size);
354
355 if (start <= init_begin)
356 start = init_begin;
357 if (start >= end)
358 continue;
359
360#ifndef CONFIG_HIGHMEM
361 if (end > max_low_pfn)
362 end = max_low_pfn;
363
364 /*
365 * ... finally, is the area going away?
366 */
367 if (end <= start)
368 continue;
369#endif
370
371 add_active_range(0, start, end);
372 }
373
345 /* 374 /*
346 * Register fully available low RAM pages with the bootmem allocator. 375 * Register fully available low RAM pages with the bootmem allocator.
347 */ 376 */